CN107012393A - The production method of carbon chromium steel in a kind of inexpensive high-hardenability - Google Patents
The production method of carbon chromium steel in a kind of inexpensive high-hardenability Download PDFInfo
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- CN107012393A CN107012393A CN201710402346.8A CN201710402346A CN107012393A CN 107012393 A CN107012393 A CN 107012393A CN 201710402346 A CN201710402346 A CN 201710402346A CN 107012393 A CN107012393 A CN 107012393A
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- steel
- hardenability
- production method
- refining
- carbon chromium
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 23
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical compound [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 238000007670 refining Methods 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 11
- 238000001291 vacuum drying Methods 0.000 claims abstract description 10
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 58
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 32
- 238000010079 rubber tapping Methods 0.000 claims description 28
- 229910052786 argon Inorganic materials 0.000 claims description 22
- 238000005516 engineering process Methods 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 244000309464 bull Species 0.000 claims description 14
- 230000009977 dual effect Effects 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 14
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000009628 steelmaking Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910004709 CaSi Inorganic materials 0.000 claims description 7
- 239000005997 Calcium carbide Substances 0.000 claims description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 241000522169 Lespedeza Species 0.000 claims description 7
- 108010038629 Molybdoferredoxin Proteins 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 239000005864 Sulphur Substances 0.000 claims description 7
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 230000009514 concussion Effects 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 2
- 239000010436 fluorite Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- -1 carburant Substances 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 238000010791 quenching Methods 0.000 abstract description 15
- 230000000171 quenching effect Effects 0.000 abstract description 15
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 abstract description 4
- 238000005204 segregation Methods 0.000 description 8
- 238000010583 slow cooling Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 241000209094 Oryza Species 0.000 description 5
- 235000007164 Oryza sativa Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 239000010459 dolomite Substances 0.000 description 5
- 229910000514 dolomite Inorganic materials 0.000 description 5
- 239000010903 husk Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 235000009566 rice Nutrition 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：Refining, LF refining furnace refining, the degassing of VD vacuum drying ovens, circular-arc type continuous casting machine continuous casting, steel rolling heating, combination dephosphorization, rolling, stacking at the beginning of top and bottom complex blowing basic bessemer converter.Quenching degree is improved the invention reside in design concept using fine setting Mo+V, good tempered sorbite tissue is obtained, meets high-end bent axle steel quality demand, is opened up new footpath and is successfully solved that 40Cr quenching degree is not enough and the high problem of 42CrMoA production costs.
Description
Technical field
The present invention relates to a kind of production method of carbon chromium steel in steelmaking technical field, more particularly to inexpensive high-hardenability.
Background technology
Bent axle is most important part in engine.It bears the power that connecting rod is transmitted, and is transformed into torque and passes through song
Axle exports and drives other annexes on engine to work.Bent axle is by the centrifugal force of gyrating mass, the gas inertia of mechanical periodicity
The collective effect of power and reciprocal inertia force, makes bent axle bear the effect of flexion torsion load.Therefore it is required that bent axle has enough strong
Degree and rigidity, journal surface need wear-resisting, the uniform, balance that works good.Current quenched class bent axle mainly has 40Cr and 42CrMo, this
Two kinds of products have different customer groups, but are the absence of a kind of product that both are mutually linked.
With updating, it is necessary to the performance to steel is constantly segmented for automobile engine, with meet cost and
Equilibrium relation between performance.
Therefore, a kind of production method of carbon chromium steel in new inexpensive high-hardenability is developed, not only with urgent research
Value, it may have good economic benefit and commercial application potentiality, where this power that exactly present invention is accomplished and basis.
The content of the invention
In order to overcome the defect of prior art as indicated above, the present inventor has made intensive studies to this, is paying
After a large amount of creative works, so as to complete the present invention.
Specifically, the technical problems to be solved by the invention are：Carbon chromium steel in a kind of inexpensive high-hardenability is provided
Production method.
In order to solve the above technical problems, the technical scheme is that：
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：At the beginning of top and bottom complex blowing basic bessemer converter
Refining, LF refining furnace refining, the degassing of VD vacuum drying ovens, circular-arc type continuous casting machine continuous casting, steel rolling heating, combination dephosphorization, rolling, stacking.
In the present invention, as a kind of perferred technical scheme, the concrete technology refined at the beginning of top and bottom complex blowing basic bessemer converter is：With
72t high-quality molten iron is main material, and is equipped with 5~8t pig iron composition steel-making primary raw material, and liquid iron charging ratio reaches 80%, blowing
During use " double slags " method dephosphorization, tapping control C content wt >=0.08%, tap P content wt≤0.010%, tapping 15~
Add SiCaBaAl 1.0kg/t, steel-core-aluminium 2.0kg/t strong deoxidations during 20t, iron alloy material, carburant, slag charge are subsequently added in bag,
The later stage tap using argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float.
Slag charge uses the mixture of hearthstone ash, pro-molten refining slag and stove fluorite,
Iron alloy material includes fero-manganesesilicon, ferrochrome, nickel plate and molybdenum-iron,
In the present invention, as a kind of perferred technical scheme, the concrete technology of the LF refining furnace refining is：Before refining furnace
Phase calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, and the dual alkalinity R of white slag is controlled 4.0~6.0；LF essences
Refine finishing slag dual alkalinity R2 >=3.5.
Design of Chemical Composition target：C, Si content wt are controlled by 0.39~0.41%, 0.23~0.27% lower limit respectively；
Mn, Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.010~
0.025%；Al content wt：0.010~0.020%.
It is described refining finishing slag chemical composition wt% be：CaO 50~65%, SiO27~15%, MgO 0.4~
1.2%, Al2O325~30%, S 0.3~0.5%, FeO≤0.50%.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the VD vacuum drying ovens degassing is：1650 ±
10 DEG C, vacuum be less than 67Pa under keep more than 15min carry out VD Fruit storages, processing terminate after feed 1.5~2.0m/
T CaSi core-spun yarns and 1.5m/t sulphur lines are denatured and Sization processing to molten steel, the soft stirring 6~12min, bull ladle of argon gas before bull ladle
1560 ± 15 DEG C of temperature.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the circular-arc type continuous casting machine continuous casting is：Big bag length
The mouth of a river uses Ar seal apparatus, whole blowing argon is flowed to big Baogang, the degree of superheat is at 25~40 DEG C, from 260mm × 300mm rectangles
Carbon mould flux in base, 0.54 ± 0.04m/min of pulling rate, conticaster uses M-EMS 3Hz/400A.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the steel rolling heating is：Using steel-pushing type plus
Hot stove, using I section of temperature control of heating at 1050-1070 DEG C, II section of temperature control of heating is in 1190-1210 DEG C, soaking zone temperature
Degree control heats II section and soaking zone heat time ＞ 4 hours at 1200-1220 DEG C, and the heating technique of >=6 hours is heated altogether
Ensure the uniform diffusion of steel.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the combination dephosphorization is：Using 260mm ×
300mm square parison combined type phosphorus removing methods, using 18-22MPa high-pressure water descalings, first three time of cogging overturns concussion surface oxidation iron
Skin, is aided with installation cuneate lespedeza de-scaling device on rollgang.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the milling step is：With 260mm ×
300mm squares parison is raw material base, after the middle square billet using 160 × 160mm of Φ 650mm blooming mills production, is rolled into Φ 87mm
Steel.
In the present invention, as a kind of perferred technical scheme, the concrete technology of the stacking step is：Using 350 DEG C of ＞
Lee concentrates stacking slow cooling mode, further goes de-stress.
Conventional 40Cr composition is adjusted in the present invention, to meet the not enough problem of 40Cr quenching degree.Emphasis is chemically
Composition and the aspect exploitation design of heating rolling technique two, the progress apart from steel surface 15mm at are organized as tempered sorbite+lack
Measure strip and granular ferrite.40CrMoV round steel is, fatigue life high the characteristics of good with quenching degree.And the present invention
40CrMoV is exactly linking product between the two.With than 40Cr preferably quenching degree, meet at steel surface 15mm still
The performance of right through hardening, obtains good tempered sorbite tissue, and low-cost and high-quality 40CrMoV successful research and development improve product
The market competitiveness.
In the present invention, Cr elements belong to the element for reducing austenite phase field, can dramatically increase the quenching degree of steel, formation
Complicated carbide can dramatically increase the wearability of steel.Mo elements belong to the element for reducing austenite phase field, for quenching for increase steel
Permeability element.When Mo contents are relatively low, the cementite met with iron and carbon formation improves the quenching degree of steel.When there is Cr in steel
When, (Mo, Fe) 23C6 will be preferentially formed, in this carbide, Cr and V can be dissolved, and the only V ability of solid solution condition
Increase the quenching degree of steel.V element belongs to strong carbide and formed, and can reduce austenite phase field, in V ＜ 0.05%, will promote
Enter Austenite Grain Growth.Austenite crystal is bigger, and crystal boundary section can be higher, and quenching degree is improved and advantageously promotes effect.
In summary, the present invention has the advantages that：
The present invention compared with prior art, with following obvious advantage：
First, the essential element such as C, Si, Mn, Cr, Mo, V in steel carries out reinforcing quenching degree design, and control is relatively generally narrower
In the range of, steel uniformity is good and properties of product fluctuation range reduces.
2nd, the present invention uses double slag operation of converter, and refining furnace makes high basicity slag, realizes low P and low S controls.And use
VD vacuum outgas and argon for protecting pouring, are controlled to impurity contents such as H, O, N, so as to reduce nonmetallic inclusionsin steel
Quantity, makes its fine dispersion, improves the low temperature ductile-brittle transition temperature of steel.
3rd, the continuous casting billet that the present invention is produced using continuous casting process, is effectively improved steel using electromagnetic agitating technology and causes
Density and component segregation.
4th, the invention reside in quenching degree is improved using Mo+V design concept is finely tuned, good tempered sorbite is obtained
Tissue, meets high-end bent axle steel quality demand, opens up new footpath and successfully solves that 40Cr quenching degree is not enough and 42CrMoA production costs
High problem.
Brief description of the drawings
Fig. 1 is the metallograph after 40CrMoV steel heat treatments；
Fig. 2 is the metallograph after 40Cr steel heat treatments；
Fig. 3 is the metallograph after 42CrMoA steel heat treatments；
Fig. 4 is the metallograph of the qualified rank steel of standard.
Embodiment
With reference to specific embodiment, the present invention is further described.But the purposes and mesh of these exemplary embodiments
Only be used for enumerate the present invention, not to the present invention real protection scope constitute it is any type of it is any limit, it is more non-will this
The protection domain of invention is confined to this.
Embodiment 1
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：
Refined at the beginning of top and bottom complex blowing basic bessemer converter：Using 72t high-quality molten iron as main material, and the steel-making of 5t pig iron composition is equipped with mainly
Raw material, liquid iron charging ratio, which reaches, takes the circumstances into consideration the additions such as adjustment lime, dolomite, ore in 80%, converting process, using " double slags "
Method dephosphorization, tapping controls C content wt to be 0.08%, and tapping P content wt is 0.010%, slag-stopping tapping；Add during tapping 15t
SiCaBaAl 1.0kg/t, the strong deoxidations of steel-core-aluminium 2.0kg/t, iron alloy material (iron alloy material include fero-manganesesilicon, ferrochrome, nickel plate and
Molybdenum-iron), carburant, slag charge (slag charge using 300kg/ stoves hearthstone ash, 500kg/ stoves pro-molten refining slag and 100kg/ stove fluorites it is mixed
Compound) it is subsequently added in bag, the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float；
LF refining furnace is refined：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, white slag
Dual alkalinity R is controlled 4.0；Design of Chemical Composition target：C, Si content wt press 0.39%, the control of 0.23% lower limit respectively；Mn、
Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.010%；Al content
wt：0.010%, surplus is Fe.LF refining finishing slag dual alkalinity R2 is 3.5；It is described refining finishing slag chemical composition wt% be：
CaO 50%, SiO27%, MgO 0.4%, Al2O325%, S 0.3%, FeO 0.50%, surplus is inevitable for other
Impurity；
VD vacuum drying ovens deaerate：15min is kept to carry out VD Fruit storages, processing knot under 1640 DEG C, vacuum 67Pa
1.5m/t CaSi core-spun yarns are fed after beam and 1.5m/t sulphur lines are denatured and Sization processing to molten steel, while adding charring rice husk
Carry out the soft stirring 6min of argon gas, 1545 DEG C of bull ladle temperature before the protection covering of molten steel, bull ladle；
Circular-arc type continuous casting machine continuous casting is poured into a mould using full guard：Big bag long nozzle uses Ar seal apparatus, and big Baogang stream whole process is blown
Argon is protected, and the degree of superheat is at 25 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, pulling rate 0.50m/min, conticaster
Using M-EMS, crystallizer electric current：400A, frequency：3Hz, electromagnetic agitating technology reduces casting blank solidification segregation tendency；
Steel rolling is heated：Using pusher-type furnace, using I section of temperature control of heating at 1050 DEG C, II section of temperature control is heated
System is at 1190 DEG C, and soaking zone temperature control heats II section and soaking zone heat time ＞ 4 hours at 1200 DEG C, and >=6 are heated altogether
The heating technique of hour ensures the uniform diffusion of steel；
Combine dephosphorization：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 18MPa high-pressure water descalings, open
First three time of base overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang；
Rolling：Using 260mm × 300mm squares parison as raw material base, produced using Φ 650mm blooming mills in 160 × 160mm
Between after square billet, be rolled into Φ 87mm steel；
Stacking：Stacking slow cooling mode is concentrated using 350 DEG C of lees of ＞, de-stress is further gone.
Embodiment 2
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：
Refined at the beginning of top and bottom complex blowing basic bessemer converter：Using 72t high-quality molten iron as main material, and the steel-making of 5t pig iron composition is equipped with mainly
Raw material, liquid iron charging ratio, which reaches, takes the circumstances into consideration the additions such as adjustment lime, dolomite, ore in 80%, converting process, using " double slags "
Method dephosphorization, tapping control C content wt0.10%, tap P content wt0.009%, slag-stopping tapping；Add SiCaBaAl during tapping 15t
1.0kg/t, the strong deoxidations of steel-core-aluminium 2.0kg/t, iron alloy material (iron alloy material includes fero-manganesesilicon, ferrochrome, nickel plate and molybdenum-iron), carburetting
Agent, slag charge (slag charge uses the mixture of 300kg/ stoves hearthstone ash, 500kg/ stoves pro-molten refining slag and 100kg/ stove fluorites) are then
Add in bag, the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float；
LF refining furnace is refined：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, white slag
Dual alkalinity R is controlled 6.0；Design of Chemical Composition target：C, Si content wt press 0.41%, the control of 0.27% lower limit respectively；Mn、
Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.025%；Al content
wt：0.020%, surplus is Fe and inevitable impurity.LF refining finishing slag dual alkalinity R2 is 4；The refining finishing slag
Chemical composition wt% is：CaO 50%, SiO215%, MgO 1.2%, Al2O330%, S 0.5%, FeO≤0.50% is remaining
Measure as other inevitable impurity；
VD vacuum drying ovens deaerate：More than 15min is kept to carry out at VD vacuum outgas in the case where 1660 DEG C, vacuum are less than 67Pa
Reason, feeding 2.0m/t CaSi core-spun yarns and 1.5m/t sulphur lines are denatured and Sization processing to molten steel after processing terminates, while plus
Enter the soft stirring 12min of argon gas, 1575 DEG C of bull ladle temperature before the protection covering that charring rice husk carries out molten steel, bull ladle；
Circular-arc type continuous casting machine continuous casting is poured into a mould using full guard：Big bag long nozzle uses Ar seal apparatus, and big Baogang stream whole process is blown
Argon is protected, and the degree of superheat is at 50 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, pulling rate 0.58m/min, conticaster
Using M-EMS, crystallizer electric current：400A, frequency：3Hz, electromagnetic agitating technology reduces casting blank solidification segregation tendency；
Steel rolling is heated：Using pusher-type furnace, using I section of temperature control of heating at 1070 DEG C, II section of temperature control is heated
System is at 1210 DEG C, and soaking zone temperature control is at 1220 DEG C, and II section of heating and soaking zone heat time are 5 hours, and 6 are heated to be altogether
The heating technique of hour ensures the uniform diffusion of steel；
Combine dephosphorization：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 22MPa high-pressure water descalings, open
First three time of base overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang；
Rolling：Using 260mm × 300mm squares parison as raw material base, produced using Φ 650mm blooming mills in 160 × 160mm
Between after square billet, be rolled into Φ 87mm steel；
Stacking：Stacking slow cooling mode is concentrated using 350 DEG C of lees of ＞, de-stress is further gone.
Embodiment 3
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：
Refined at the beginning of top and bottom complex blowing basic bessemer converter：Using 72t high-quality molten iron as main material, and the steel-making of 5t pig iron composition is equipped with mainly
Raw material, liquid iron charging ratio, which reaches, takes the circumstances into consideration the additions such as adjustment lime, dolomite, ore in 80%, converting process, using " double slags "
Method dephosphorization, tapping controls C content wt to be 0.12%, and tapping P content wt is 0.008%, slag-stopping tapping；Add during tapping 18t
SiCaBaAl 1.0kg/t, the strong deoxidations of steel-core-aluminium 2.0kg/t, iron alloy material (iron alloy material include fero-manganesesilicon, ferrochrome, nickel plate and
Molybdenum-iron), carburant, slag charge (slag charge using 300kg/ stoves hearthstone ash, 500kg/ stoves pro-molten refining slag and 100kg/ stove fluorites it is mixed
Compound) it is subsequently added in bag, the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float；
LF refining furnace is refined：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, white slag
Dual alkalinity R is controlled 4.8；Design of Chemical Composition target：C, Si content wt press 0.40%, the control of 0.25% lower limit respectively；Mn、
Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.020%；Al content
wt：0.015%.LF refining finishing slag dual alkalinity R2 is 4.5；It is described refining finishing slag chemical composition wt% be：CaO
58.02%, SiO212.89%, MgO 0.38%, Al2O328.12%, S 0.39%, FeO 0.2%；
VD vacuum drying ovens deaerate：20min is kept to carry out VD Fruit storages, processing knot under 1650 DEG C, vacuum 65Pa
1.8m/t CaSi core-spun yarns are fed after beam and 1.5m/t sulphur lines are denatured and Sization processing to molten steel, while adding charring rice husk
Carry out the soft stirring 9min of argon gas, 1560 DEG C of bull ladle temperature before the protection covering of molten steel, bull ladle；
Circular-arc type continuous casting machine continuous casting is poured into a mould using full guard：Big bag long nozzle uses Ar seal apparatus, and big Baogang stream whole process is blown
Argon is protected, and the degree of superheat is at 35 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, pulling rate 0.54m/min, conticaster
Using M-EMS, crystallizer electric current：400A, frequency：3Hz, electromagnetic agitating technology reduces casting blank solidification segregation tendency；
Steel rolling is heated：Using pusher-type furnace, using I section of temperature control of heating at 1060 DEG C, II section of temperature control is heated
System is at 1200 DEG C, and soaking zone temperature control is at 1210 DEG C, and II section of heating and soaking zone heat time are 6 hours, and 7 are heated to be altogether
The heating technique of hour ensures the uniform diffusion of steel；
Combine dephosphorization：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 20MPa high-pressure water descalings, open
First three time of base overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang；
Rolling：Using 260mm × 300mm squares parison as raw material base, produced using Φ 650mm blooming mills in 160 × 160mm
Between after square billet, be rolled into Φ 87mm steel；
Stacking：Stacking slow cooling mode is concentrated using 350 DEG C of lees of ＞, de-stress is further gone.
Embodiment 4
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：
Refined at the beginning of top and bottom complex blowing basic bessemer converter：Using 72t high-quality molten iron as main material, and the steel-making of 5t pig iron composition is equipped with mainly
Raw material, liquid iron charging ratio, which reaches, takes the circumstances into consideration the additions such as adjustment lime, dolomite, ore in 80%, converting process, using " double slags "
Method dephosphorization, tapping control C content wt >=0.08%, tap P content wt≤0.010%, slag-stopping tapping；Add during tapping 20t
SiCaBaAl 1.0kg/t, the strong deoxidations of steel-core-aluminium 2.0kg/t, iron alloy material (iron alloy material include fero-manganesesilicon, ferrochrome, nickel plate and
Molybdenum-iron), carburant, slag charge (slag charge using 300kg/ stoves hearthstone ash, 500kg/ stoves pro-molten refining slag and 100kg/ stove fluorites it is mixed
Compound) it is subsequently added in bag, the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float；
LF refining furnace is refined：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, white slag
Dual alkalinity R is controlled 5；Design of Chemical Composition target：C, Si content wt press 0.39%, the control of 0.27% lower limit respectively；Mn、
Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.015%；Al content
wt：0.012%, surplus is Fe.LF refining finishing slag dual alkalinity R2 is 4.5；It is described refining finishing slag chemical composition wt% be：
CaO 51%, SiO28%, MgO 0.6%, Al2O325%, S 0.4%, FeO≤0.50%, surplus is inevitably miscellaneous
Matter；
VD vacuum drying ovens deaerate：More than 15min is kept to carry out at VD vacuum outgas in the case where 1655 DEG C, vacuum are less than 67Pa
Reason, feeding 1.7m/t CaSi core-spun yarns and 1.5m/t sulphur lines are denatured and Sization processing to molten steel after processing terminates, while plus
Enter the soft stirring 10min of argon gas, 1565 DEG C of bull ladle temperature before the protection covering that charring rice husk carries out molten steel, bull ladle；
Circular-arc type continuous casting machine continuous casting is poured into a mould using full guard：Big bag long nozzle uses Ar seal apparatus, and big Baogang stream whole process is blown
Argon is protected, and the degree of superheat is at 35 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, pulling rate 0.55m/min, conticaster
Using M-EMS, crystallizer electric current：400A, frequency：3Hz, electromagnetic agitating technology reduces casting blank solidification segregation tendency；
Steel rolling is heated：Using pusher-type furnace, using I section of temperature control of heating at 1055 DEG C, II section of temperature control is heated
System is at 1200 DEG C, and soaking zone temperature control is at 1220 DEG C, and II section of heating and soaking zone heat time are 4.5 hours, are heated altogether
Ensure the uniform diffusion of steel for the heating techniques of 6 hours；
Combine dephosphorization：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 19MPa high-pressure water descalings, open
First three time of base overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang；
Rolling：Using 260mm × 300mm squares parison as raw material base, produced using Φ 650mm blooming mills in 160 × 160mm
Between after square billet, be rolled into Φ 87mm steel；
Stacking：Stacking slow cooling mode is concentrated using 350 DEG C of lees of ＞, de-stress is further gone.
Embodiment 5
The production method of carbon chromium steel, comprises the following steps in a kind of inexpensive high-hardenability：
Refined at the beginning of top and bottom complex blowing basic bessemer converter：Using 72t high-quality molten iron as main material, and the steel-making of 5t pig iron composition is equipped with mainly
Raw material, liquid iron charging ratio, which reaches, takes the circumstances into consideration the additions such as adjustment lime, dolomite, ore in 80%, converting process, using " double slags "
Method dephosphorization, tapping controls C content wt to be 0.08%, and tapping P content wt is 0.010%, slag-stopping tapping；Add during tapping 15t
SiCaBaAl 1.0kg/t, the strong deoxidations of steel-core-aluminium 2.0kg/t, iron alloy material (iron alloy material include fero-manganesesilicon, ferrochrome, nickel plate and
Molybdenum-iron), carburant, slag charge (slag charge using 300kg/ stoves hearthstone ash, 500kg/ stoves pro-molten refining slag and 100kg/ stove fluorites it is mixed
Compound) it is subsequently added in bag, the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and promotes deoxidation products to float；
LF refining furnace is refined：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag as early as possible, white slag
Dual alkalinity R is controlled 5.5；Design of Chemical Composition target：C, Si content wt press 0.41%, the control of 0.24% lower limit respectively；Mn、
Cr, Mo, V content wt are controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.023%；Al content
wt：0.015%.LF refining finishing slag dual alkalinity R2 is 4；It is described refining finishing slag chemical composition wt% be：CaO 65%, SiO2
7%, MgO 0.4%, Al2O325%, S 0.5%, FeO≤0.50%, surplus is other impurities；
VD vacuum drying ovens deaerate：More than 15min is kept to carry out at VD vacuum outgas in the case where 1655 DEG C, vacuum are less than 67Pa
Reason, feeding 1.8m/t CaSi core-spun yarns and 1.5m/t sulphur lines are denatured and Sization processing to molten steel after processing terminates, while plus
Enter argon gas 6~12min of soft stirring, 1550 DEG C of bull ladle temperature before the protection covering that charring rice husk carries out molten steel, bull ladle；
Circular-arc type continuous casting machine continuous casting is poured into a mould using full guard：Big bag long nozzle uses Ar seal apparatus, and big Baogang stream whole process is blown
Argon is protected, and the degree of superheat is at 45 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, pulling rate 0.52m/min, conticaster
Using M-EMS, crystallizer electric current：400A, frequency：3Hz, electromagnetic agitating technology reduces casting blank solidification segregation tendency；
Steel rolling is heated：Using pusher-type furnace, using I section of temperature control of heating at 1065 DEG C, II section of temperature control is heated
System is at 1195 DEG C, and soaking zone temperature control is at 1210 DEG C, and II section of heating and soaking zone heat time are 5 hours, and 7 are heated to be altogether
The heating technique of hour ensures the uniform diffusion of steel；
Combine dephosphorization：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 21MPa high-pressure water descalings, open
First three time of base overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang；
Rolling：Using 260mm × 300mm squares parison as raw material base, produced using Φ 650mm blooming mills in 160 × 160mm
Between after square billet, be rolled into Φ 87mm steel；
Stacking：Stacking slow cooling mode is concentrated using 350 DEG C of lees of ＞, de-stress is further gone.
Detect embodiment
Example 3 prepare inexpensive high-hardenability in carbon chromium steel (40CrMoV steel), according to 850 DEG C insulation 174min,
After 580 DEG C of insulation 261min of water quenching are quenched metallographic structure is obtained at the 15mm of surface.
The quenched rear microscopic structure grading of table 1
Table 2 is the macroscopic examination result for the 40CrMoV steel that the embodiment of the present invention 3 is obtained
The stocking macrostructure of table 2 grades (level)
| The trade mark | General Loosen | Center porosity | General spot segregation | Edge spot segregation |
| 40CrMoV | 0/0.5 | 0.5/1.0 | Nothing | Nothing |
| 40Cr | 0.5/0.5 | 0.5/1.0 | Nothing | Nothing |
| 42CrMoA | 0/0.5 | 1.0/0.5 | Nothing | Nothing |
| Standard requirement | ≤2 | ≤2 | Nothing | Nothing |
Table 3 is the Cost comparisons of 40CrMoV steel and remaining steel that the present embodiment 3 is obtained：
| The trade mark | Cost |
| 40CrMoV | 2970 |
| 40Cr | 2900 |
| 42CrMoA | 3100 |
Table 4 is the 40CrMoV steel that the present embodiment 3 is obtained and contrasted with the quenching degree of remaining steel
It should be appreciated that the purposes of these embodiments is merely to illustrate the present invention and is not intended to limitation protection model of the invention
Enclose.In addition, it will also be appreciated that after the technology contents of the present invention have been read, those skilled in the art can make each to the present invention
Change, modification and/or variation are planted, all these equivalent form of values equally fall within the guarantor that the application appended claims are limited
Within the scope of shield.
Claims (10)
1. the production method of carbon chromium steel in a kind of inexpensive high-hardenability, it is characterised in that：Comprise the following steps：Top and bottom complex blowing alkali
Property refining at the beginning of converter, LF refining furnace refining, the degassing of VD vacuum drying ovens, circular-arc type continuous casting machine continuous casting, steel rolling heating, combination dephosphorization, rolling, heap
Pile.
2. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：Bottom is pushed up to answer
The concrete technology refined at the beginning of blowing basic bessemer converter is：Using 72t high-quality molten iron as main material, and it is equipped with 5~8t pig iron composition steel-making master
Raw material is wanted, liquid iron charging ratio, which reaches, uses " double slags " method dephosphorization in 80%, converting process, tapping control C content wt >=0.08%,
Tapping P content wt≤0.010%, adds SiCaBaAl 1.0kg/t, steel-core-aluminium 2.0kg/t strong deoxidations during 15~20t of tapping, iron is closed
Golden material, carburant, slag charge are subsequently added in bag, and the tapping later stage uses argon gas strong mixing, with uniform temperature and composition, and are promoted de-
Oxygen product floats.
3. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 2, it is characterised in that：Slag charge is adopted
With the mixture of hearthstone ash, pro-molten refining slag and stove fluorite, iron alloy material includes fero-manganesesilicon, ferrochrome, nickel plate and molybdenum-iron.
4. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：The LF
Refining furnace refining concrete technology be：Refining furnace early stage calcium carbide and carborundum diffusive deoxidation, form stable white slag, white slag as early as possible
Dual alkalinity R control 4.0~6.0；LF refining finishing slag dual alkalinity R2 >=3.5.
5. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 4, it is characterised in that：Chemistry into
Divide design object：C, Si content wt are controlled by 0.39~0.41%, 0.23~0.27% lower limit respectively；Mn, Cr, Mo, V content wt
Controlled by 0.78%, 1.08%, 0.06%, 0.04% desired value；S contents wt：0.010~0.025%；Al content wt：0.010
~0.020%.
6. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 5, it is characterised in that：The essence
Refining finishing slag chemical composition wt% be：CaO 50~65%, SiO27~15%, MgO 0.4~1.2%, Al2O325~
30%, S 0.3~0.5%, FeO≤0.50%.
7. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：The VD
Vacuum drying oven degassing concrete technology be：Keep more than 15min to carry out VD vacuum in the case where 1650 ± 10 DEG C, vacuum are less than 67Pa to take off
Gas disposal, feeding 1.5~2.0m/t CaSi core-spun yarns and 1.5m/t sulphur lines are denatured and Sization place to molten steel after processing terminates
Argon gas 6~12min of soft stirring, 1560 ± 15 DEG C of bull ladle temperature before reason, bull ladle.
8. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：The arc
The concrete technology of shape conticaster continuous casting is：Big bag long nozzle uses Ar seal apparatus, and whole blowing argon, the degree of superheat are flowed to big Baogang
At 25~40 DEG C, from carbon mould flux in 260mm × 300mm rectangular blooms, 0.54 ± 0.04m/min of pulling rate, conticaster is adopted
Use M-EMS 3Hz/400A.
9. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：It is described to roll
Steel heating concrete technology be：Using pusher-type furnace, using I section of temperature control of heating at 1050-1070 DEG C, II section is heated
Temperature control is at 1190-1210 DEG C, and soaking zone temperature control is at 1200-1220 DEG C, II section of heating and soaking zone heat time ＞ 4
Hour, the heating technique heated altogether >=6 hours ensures the uniform diffusion of steel.
10. the production method of carbon chromium steel in a kind of inexpensive high-hardenability as claimed in claim 1, it is characterised in that：It is described
Combination dephosphorization concrete technology be：Using 260mm × 300mm square parison combined type phosphorus removing methods, using 18-22MPa water under high pressures
De-scaling, first three time of cogging overturns concussion scale on surface, is aided with installation cuneate lespedeza de-scaling device on rollgang.
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Denomination of invention: A low-cost and high hardenability production method for medium carbon chromium steel Granted publication date: 20180515 Pledgee: Shandong Shouguang Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG SHOUGUANG JUNENG SPECIAL STEEL Co.,Ltd. Registration number: Y2024980019696 |