CN105543711A - Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation - Google Patents
Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 72
- 238000005204 segregation Methods 0.000 title claims abstract description 38
- 238000005096 rolling process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000000452 restraining effect Effects 0.000 title abstract 2
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 230000006698 induction Effects 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 239000011651 chromium Substances 0.000 claims description 37
- 229910052804 chromium Inorganic materials 0.000 claims description 23
- 238000005266 casting Methods 0.000 claims description 20
- 229910052750 molybdenum Inorganic materials 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 8
- 241001417490 Sillaginidae Species 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005275 alloying Methods 0.000 description 7
- 238000000137 annealing Methods 0.000 description 7
- 230000006399 behavior Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 235000012149 noodles Nutrition 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004453 electron probe microanalysis Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 235000021110 pickles Nutrition 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0697—Accessories therefor for casting in a protected atmosphere
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention discloses a cast-rolling method for restraining a Cr element and a Mo element of super-austenitic stainless steel from center segregation and belongs to the technical field of manufacturing of the super-austenitic stainless steel. The method includes the steps that (1) raw materials are weighed according to the composition proportion of the super-austenitic stainless steel, and the raw materials are subjected to heat preservation at the temperature ranging from 150 DEG C to 250 DEG C for 100 minutes to 150 minutes; (2) the raw materials are sorted and placed into a vacuum induction melting furnace step by step to obtain molten steel by being smelted; and (3) the molten steel is poured into a dual-roll thin strip cast-rolling machine for cast rolling under shielding of high-purity nitrogen, and a thin super-austenitic stainless steel strip 2.0-3.0 mm thick is obtained, wherein the pouring temperature ranges from 1450 DEG C to 1550 DEG C, the cast-rolling speed ranges from 10 m/min to 40 m/min, and the cast-rolling force ranges from 30 kN to 70 kN. According to the manufactured thin super-austenitic stainless steel strip, center segregation of the Cr element and the Mo element is restrained, and on the premise of maintaining the plasticity, the yield strength is improved by 5%-10% compared with that of traditional strip steel of the same specification as the thin super-austenitic stainless steel strip. Meanwhile, the cast-rolling method reduces energy consumption and production cost, improves the utilization rate of materials and reduces environmental pollution.
Description
Technical field
The invention belongs to super austenitic stainless steel preparing technical field, particularly a kind ofly suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation.
Background technology
Super austenitic stainless steel is the stainless steel of a class high-alloying, and the cold-reduced sheet of its Thin Specs has wide application in the field that the environment such as chemistry, pharmacy, petrochemical complex, power station are comparatively severe.More common austenitic stainless steel, super austenitic stainless steel contains the alloying elements such as a large amount of Cr, Ni, Mo, make it have higher intensity, toughness and plasticity, and excellent welding performance, most importantly the significantly raising of its corrosion resisting property in various medium, meet user to the demand of material can resisting severe environment, make the range of application of super austenitic stainless steel and increasing to its demand.
In super austenitic stainless steel, some alloying element content is very high, as Cr and Mo etc., in traditional cast, in smelting process, Cr and Mo element can form dendritic segregation, in process air cooler subsequently, segregation behavior continues to carry out, finally cause the overall segregation of centre portions, because the spread coefficient of alloying element is very little, even if be also difficult to eliminate this segregation through long-time high temperature homogenizing annealing, and high-content alloying element causes resistance to deformation large, easily crackle is formed during strand hot rolling cogging, or even cracking, therefore the method for hammer cogging is carried out in many employings after the soak long period during cogging.After cogging in multistage hot deformation deformation process, above-mentioned segregation element can grow formation second-phase, and be mainly laves, σ, χ, carbide etc., finally, these second-phases can be retained in the tissue of using state.
Second-phase in super austenitic stainless steel mainly exists with the form of intermetallic compound, mostly be rigid brittle phase, continuous or discontinuously arranged along crystal boundary, in hot-work or heat treatment process, easy alligatoring is grown up, have even with matrix stripping, serious harm will be brought to super austenitic stainless steel: 1) worsen the corrosion resisting property of super austenitic stainless steel, due to the difference of matrix and precipitated phase alloying element content, cause the difference of corrosion potential, and the local caused or selective corrosion; 2) intensity of super austenitic stainless steel, toughness and plasticity is reduced.When super austenitic stainless steel is subject to External Force Acting, as stretching, impact etc., the second-phase that crystal boundary exists makes the bonding force between each crystal grain of austenite weaken, become the source of crack initiation and propagation, its toughness and plasticity are seriously undermined, reduce use properties and the service life of material, directly have influence on security and the practicality of equipment in its Application Areas.
Retrieved by the retrieval system such as star (CPRS), SooPAT of middle National IP Network (CNKI), patent, do not retrieve and utilize casting-rolling method to produce super austenitic stainless steel and control relevant the applying for a patent of Cr and Mo element center segregation in super austenitic stainless steel.For super austenitic stainless steel Cr and Mo element segregation serious, the problem of a large amount of Second Phase Precipitation, also there is no efficient solution at present, industrial production technical way is: improve solid solution temperature and increase the solution treatment time, wherein solid solution temperature is up to more than 1200 DEG C, even higher, this solid solution temperature is far above the solid solution temperature of common austenitic stainless steel, so, the ability of furnace apparatus is had higher requirement, add material scaling loss and energy consumption simultaneously, reduce the utilization ratio of material, increase the weight of the ability to bear of environment, be unfavorable for the sustainable Green Development of economy and environment.
Summary of the invention
For Problems existing in existing super austenitic stainless steel preparation method, the invention provides and a kind ofly suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation.
Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation, comprise the following steps:
Step 1: by the composition proportion of super austenitic stainless steel, take raw material, by each raw material at 150 ~ 250 DEG C of insulation 100 ~ 150min, wherein, super austenitic stainless steel, Ingredient percent is: C≤0.03%, N:0.18 ~ 0.25%, Si≤1.0%, Cu≤0.75%, Mn≤2.0%, Mo:6 ~ 7%, Cr:20 ~ 22%, Ni:23.5 ~ 25.5%, P≤0.04%, S≤0.03%, surplus is Fe and inevitable impurity;
Step 2: each raw material is classified, substep puts into vacuum induction melting furnace, and vacuum tightness is 0.1 ~ 10Pa, smelts and obtains molten steel;
Step 3: under high pure nitrogen protection, poured into by molten steel in double roll strip casting mill and carry out casting, wherein teeming temperature is 1450 ~ 1550 DEG C, and roll casting speed is 10 ~ 40m/min, and casting-rolling force 30 ~ 70kN obtains super austenitic stainless steel strip.
The super austenitic stainless steel strip thickness that the present invention prepares is 2.0 ~ 3.0mm.
Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation, compared with prior art, beneficial effect is:
(1) the present invention is under the prerequisite not changing alloying constituent, inhibit the center segregation phenomenon of Cr and the Mo element of severe exacerbation super austenitic stainless steel performance, compared with band steel prepared by traditional technology, under the prerequisite ensureing plasticity, yield strength improves 5% ~ 10%.
(2) the present invention adopts this advanced abbreviated system of thin-belt casting rolling, with by smelting, pour into a mould, heat, compared with the traditional technology that forms of rolling, the operation such as annealing, significantly decrease the production process of Thin Strip Steel, process avoids that steel band heats at traditional strand simultaneously, energy consumption in the production process such as rolling and annealing and processing loss, save the energy, Mineral resources, reduce production cost, improve economic benefit.
(3) present invention, avoiding material and produce a large amount of iron scale in the traditional mode of production process such as strand heating, hot rolling deformation and annealing, and decrease the process of spent pickle liquor and reduce the discharge of the obnoxious flavour brought because of energy consumption, thus considerably reduce material environmental pollution caused in process of production, finally facilitate sustainable Green Development.
Accompanying drawing explanation
Fig. 1 is the backscattered electron image of the comparative example ingot casting as-cast structure central position of embodiment 1;
Fig. 2 is that result is swept in the face of the Mo element of the comparative example ingot casting as-cast structure central position of embodiment 1;
Fig. 3 is that result is swept in the face of the Cr element of the comparative example ingot casting as-cast structure central position of embodiment 1;
Fig. 4 is the backscattered electron image of super austenitic stainless steel strip as-cast structure prepared by embodiment 1;
Fig. 5 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Mo element prepared by embodiment 1;
Fig. 6 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Cr element prepared by embodiment 1;
Fig. 7 is the backscattered electron image of super austenitic stainless steel strip as-cast structure prepared by embodiment 2;
Fig. 8 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Mo element prepared by embodiment 2;
Fig. 9 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Cr element prepared by embodiment 2;
Figure 10 is super austenitic stainless steel strip as-cast structure backscattered electron image prepared by embodiment 3;
Figure 11 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Mo element prepared by embodiment 3;
Figure 12 is that result is swept in the face of super austenitic stainless steel strip as-cast structure Cr element prepared by embodiment 3.
Embodiment
The model of the vacuum induction melting furnace adopted in following examples is ZG-0.05; The double roll strip casting mill adopted is horizontal, and be configured with inner cooling type roller, roller diameter is 500mm, and body of roll width is 110 ~ 254mm; The cold-rolling mill adopted is Straight pull four roller reversible cold rolling/warm-rolling experimental mill; Pickle solution adopts 1000ml water, 30ml hydrofluoric acid and 120ml nitric acid mixing solutions, soaks 15 ~ 60min; The intensity measuring apparatus adopted is CMT7000 type computer electronic universal testing machine; Observation microstructure and second-phase adopt ZeissUltra55 type scanning electron microscope; Observation element segregation adopts JEOLJXA-8530F type electronic probe.
Comparative example
The step that the traditional technology adopted prepares super austenitic stainless steel strip is:
According to super austenitic stainless steel mass percent apolegamy raw material, employing vacuum induction melting furnace is smelted, pour into 40Kg ~ 50Kg strand, strand be heated to 1250 DEG C insulation 120min after hammer cogging, reheated by strand after cogging to 1200 DEG C and be incubated 120min, Φ 450mm × 450mm two-roller reversible formula experiment hot milling train carries out hot rolling, and start rolling temperature is 1150 DEG C, finishing temperature is 960 DEG C, and obtaining thickness is the hot-rolled sheet that 5.5mm is thick.Then hot-rolled sheet quenched after 1200 DEG C of insulation 30min and carry out pickling, the hot-rolled sheet after pickling being carried out cold roller and deformed in EXPERIMENTAL COLD ROLLING MILL TYPE, obtains the cold-reduced sheet that thickness is 1.0mm.Finally quenched after 1150 DEG C of insulation 15min by cold-reduced sheet again, obtain super austenitic stainless steel strip prepared by traditional technology, and carry out intensity and plasticity measurement to it, wherein, tensile strength is 738MPa, and yield strength is 323MPa, unit elongation is 45%.
Embodiment 1
Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation, comprise the following steps:
Step 1: by the composition proportion of super austenitic stainless steel, take raw material, by each raw material at 200 DEG C of insulation 120min, wherein, super austenitic stainless steel strip, Ingredient percent is: C≤0.03%, N:0.2%, Si:0.5%, Cu:0.35%, Mn:1.0%, Mo:6.0%, Cr:20%, Ni:24%, P≤0.04%, S≤0.03%, surplus is Fe and inevitable impurity;
Step 2: each raw material is classified, substep puts into vacuum induction melting furnace, and vacuum tightness is 5Pa, smelts and obtains molten steel;
Step 3: under high pure nitrogen protection, poured into by molten steel in double roll strip casting mill and carry out casting, wherein teeming temperature is 1520 DEG C, and roll casting speed is 27m/min, casting-rolling force 57kN, and obtaining thickness is 2.0mm super austenitic stainless steel strip.
Traditional technology preparation and embodiment 1 is adopted to have the super austenitic stainless steel strip of identical chemical composition, as the comparative example of embodiment 1, pass through electron probe microanalysis, comparative example can be observed and have obvious chromium and molybdenum element segregation behavior, as shown in Figure 1, Figure 2 and Figure 3, wherein segregation element is mainly Cr and Mo two kinds of elements, and Fig. 1 is the backscattered electron image of strand central position, Fig. 2 is that result swept by Mo unit vegetarian noodles, and Fig. 3 is that result swept by Cr unit vegetarian noodles.And Cr and Mo two kinds of element segregation behaviors are obviously suppressed in super austenitic stainless steel strip prepared by the present embodiment, position is swept as shown in Figure 4, Figure 5 and Figure 6 in face; Wherein Fig. 4 is backscattered electron image, does not observe element segregation phenomenon; Fig. 5 is that result swept by Mo unit vegetarian noodles, observes Mo element center segregation phenomena and is inhibited; Fig. 6 is Cr elemental scan result, observes Cr element center segregation phenomena and is inhibited.
The super austenitic stainless steel strip prepared by the present embodiment is thin to quench after 1150 DEG C of solution treatment 20min, then pickling is carried out and cold roller and deformed thick to 1.0mm, cold-reduced sheet is quenched after 1150 DEG C of annealing 15min, carry out intensity and plasticity measurement, the tensile strength of strip prepared by the present embodiment is 748MPa, yield strength is 339MPa, unit elongation is 45.1%, the strip of the same size that 1.0mm thickness band prepared by the present embodiment is prepared compared with traditional technology, yield strength improves 5%, and plasticity remains unchanged.
Embodiment 2
Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation, comprise the following steps:
Step 1: by the composition proportion of super austenitic stainless steel, take raw material, by each raw material at 200 DEG C of insulation 120min, wherein, super austenitic stainless steel, Ingredient percent is: C≤0.03, N:0.2, Si:0.5, Cu:0.35, Mn:1.0, Mo:6.0, Cr:20, Ni:24, P≤0.04%, S≤0.03%, surplus is Fe and inevitable impurity;
Step 2: each raw material is classified, substep puts into vacuum induction melting furnace, and vacuum tightness is 5Pa, smelts and obtains molten steel;
Step 3: under high pure nitrogen protection, poured into by molten steel in double roll strip casting mill and carry out casting, wherein teeming temperature is 1520 DEG C, and roll casting speed is 27m/min, casting-rolling force 57kN, and obtaining thickness is 2.5mm super austenitic stainless steel strip.
Adopt traditional technology preparation and embodiment 2 to have the super austenitic stainless steel strip of identical chemical composition, as the comparative example of embodiment 2, by electron probe microanalysis, the obvious element segregation behavior of comparative example can be observed.In super austenitic stainless steel strip prepared by the present embodiment, Cr and Mo two kinds of element segregation behaviors are obviously suppressed, and position is swept as shown in Figure 7, Figure 8 and Figure 9 in face; Wherein Fig. 7 is backscattered electron image, does not observe element segregation phenomenon; Fig. 8 is that result swept by Mo unit vegetarian noodles, observes Mo element center segregation phenomena and is inhibited; Fig. 9 is Cr elemental scan result, observes Cr element center segregation phenomena and is inhibited.
The super austenitic stainless steel strip prepared by the present embodiment is thin to quench after 1150 DEG C of solution treatment 20min, then pickling is carried out and cold roller and deformed thick to 1.0mm, cold-reduced sheet is quenched after 1150 DEG C of annealing 15min, carry out intensity and plasticity measurement, the tensile strength of strip prepared by the present embodiment is 760MPa, yield strength is 348MPa, unit elongation is 44.9%, the strip of the same size that 1.0mm thickness band prepared by the present embodiment is prepared compared with traditional technology, yield strength improves 7.5%, and plasticity remains unchanged.
Embodiment 3
Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation, comprise the following steps:
Step 1: by the composition proportion of super austenitic stainless steel, take raw material, by each raw material at 200 DEG C of insulation 120min, super austenitic stainless steel, Ingredient percent is: C≤0.03, N:0.2, Si:0.5, Cu:0.35, Mn:1.0, Mo:6.0, Cr:20, Ni:24, P≤0.04%, S≤0.03%, surplus is Fe and inevitable impurity;
Step 2: each raw material is classified, substep puts into vacuum induction melting furnace, and vacuum tightness is 5Pa, smelts and obtains molten steel;
Step 3: under high pure nitrogen protection, poured into by molten steel in double roll strip casting mill and carry out casting, wherein teeming temperature is 1520 DEG C, and roll casting speed is 27m/min, casting-rolling force 57kN, and obtaining thickness is 3.0mm super austenitic stainless steel strip.
Adopt traditional technology preparation and embodiment 1 to have the super austenitic stainless steel strip of identical chemical composition, as the comparative example of the present embodiment, by electron probe microanalysis, the obvious element segregation behavior of comparative example can be observed.The present embodiment prepare super austenitic stainless steel strip in Cr and Mo two kinds of element segregation behaviors obviously suppressed, position is swept as shown in Figure 10, Figure 11 and Figure 12 in face; Wherein Figure 10 is backscattered electron image, does not observe element segregation phenomenon; Figure 11 is that result swept by Mo unit vegetarian noodles, observes Mo element center segregation phenomena and is inhibited; Figure 12 is Cr elemental scan result, observes Cr element center segregation phenomena and is inhibited.
The super austenitic stainless steel strip prepared by the present embodiment is thin to quench after 1150 DEG C of solution treatment 20min, then pickling is carried out and cold roller and deformed thick to 1.0mm, cold-reduced sheet is quenched after 1150 DEG C of annealing 15min, carry out intensity and plasticity measurement, the tensile strength of strip prepared by the present embodiment is 773MPa, yield strength is 353.9MPa, unit elongation is 44.7%, the strip of the same size that 1.0mm thickness band prepared by the present embodiment is prepared compared with traditional technology, yield strength improves 10%, and plasticity remains unchanged.
Claims (2)
1. suppress the chromium of super austenitic stainless steel and a casting-rolling method for molybdenum element center segregation, it is characterized in that, comprise the following steps:
Step 1: by the composition proportion of super austenitic stainless steel, take raw material, by each raw material at 150 ~ 250 DEG C of insulation 100 ~ 150min, wherein, super austenitic stainless steel, Ingredient percent is: C≤0.03%, N:0.18 ~ 0.25%, Si≤1.0%, Cu≤0.75%, Mn≤2.0%, Mo:6 ~ 7%, Cr:20 ~ 22%, Ni; 23.5 ~ 25.5%, P≤0.04%, S≤0.03%, surplus is Fe and inevitable impurity;
Step 2: each raw material is classified, substep puts into vacuum induction melting furnace, and vacuum tightness is 0.1 ~ 10Pa, smelts and obtains molten steel;
Step 3: under high pure nitrogen protection, poured into by molten steel in double roll strip casting mill and carry out casting, wherein teeming temperature is 1450 ~ 1550 DEG C, and roll casting speed is 10 ~ 40m/min, and casting-rolling force 30 ~ 70kN obtains super austenitic stainless steel strip.
2. the chromium of suppression super austenitic stainless steel according to claim 1 and the casting-rolling method of molybdenum element center segregation, is characterized in that, the super austenitic stainless steel strip thickness that described casting-rolling method is prepared is 2.0 ~ 3.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969660.5A CN105543711B (en) | 2015-12-22 | 2015-12-22 | Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969660.5A CN105543711B (en) | 2015-12-22 | 2015-12-22 | Suppress the chromium of super austenitic stainless steel and the casting-rolling method of molybdenum element center segregation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105543711A true CN105543711A (en) | 2016-05-04 |
| CN105543711B CN105543711B (en) | 2017-06-20 |
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| CN106636951A (en) * | 2016-11-10 | 2017-05-10 | 合肥辰泰安全设备有限责任公司 | Alloy material for spraying nozzle |
| CN107030264A (en) * | 2017-04-27 | 2017-08-11 | 酒泉钢铁(集团)有限责任公司 | A kind of super austenitic stainless steel double roll strip casting rolling production process |
| CN107058909A (en) * | 2017-03-13 | 2017-08-18 | 东北大学 | One kind improves the thermoplastic method of super austenitic stainless steel |
| CN108396223A (en) * | 2018-03-29 | 2018-08-14 | 东北大学 | A kind of super austenitic stainless steel and its alloying component optimum design method |
| CN106957996B (en) * | 2017-04-27 | 2018-11-06 | 东北大学 | A kind of preparation method of the cold-reduced sheet of super austenitic stainless steel containing Sn |
| CN110199048A (en) * | 2016-12-23 | 2019-09-03 | 株式会社Posco | Austenitic stainless steel converted products and its manufacturing method with excellent surface characteristic |
| CN110225992A (en) * | 2016-12-23 | 2019-09-10 | 株式会社Posco | Austenitic stainless steel and its manufacturing method with excellent processability and surface characteristic |
| CN112011730A (en) * | 2019-05-29 | 2020-12-01 | 宝山钢铁股份有限公司 | Slab continuous casting process for high-molybdenum high-chromium high-nitrogen steel and slab |
| CN114075640A (en) * | 2020-08-13 | 2022-02-22 | 宝武特种冶金有限公司 | High-corrosion-resistance austenitic stainless steel and manufacturing method thereof |
| CN115976417A (en) * | 2023-02-17 | 2023-04-18 | 东北大学 | High-nitrogen low-molybdenum super austenitic stainless steel and preparation method thereof |
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| CN106636951A (en) * | 2016-11-10 | 2017-05-10 | 合肥辰泰安全设备有限责任公司 | Alloy material for spraying nozzle |
| CN110225992A (en) * | 2016-12-23 | 2019-09-10 | 株式会社Posco | Austenitic stainless steel and its manufacturing method with excellent processability and surface characteristic |
| CN110199048A (en) * | 2016-12-23 | 2019-09-03 | 株式会社Posco | Austenitic stainless steel converted products and its manufacturing method with excellent surface characteristic |
| CN107058909A (en) * | 2017-03-13 | 2017-08-18 | 东北大学 | One kind improves the thermoplastic method of super austenitic stainless steel |
| CN107058909B (en) * | 2017-03-13 | 2018-11-20 | 东北大学 | A kind of thermoplastic method of improvement super austenitic stainless steel |
| CN107030264A (en) * | 2017-04-27 | 2017-08-11 | 酒泉钢铁(集团)有限责任公司 | A kind of super austenitic stainless steel double roll strip casting rolling production process |
| CN106957996B (en) * | 2017-04-27 | 2018-11-06 | 东北大学 | A kind of preparation method of the cold-reduced sheet of super austenitic stainless steel containing Sn |
| CN107030264B (en) * | 2017-04-27 | 2019-04-26 | 酒泉钢铁(集团)有限责任公司 | A kind of super austenitic stainless steel double roll strip casting rolling production process |
| CN108396223A (en) * | 2018-03-29 | 2018-08-14 | 东北大学 | A kind of super austenitic stainless steel and its alloying component optimum design method |
| CN112011730A (en) * | 2019-05-29 | 2020-12-01 | 宝山钢铁股份有限公司 | Slab continuous casting process for high-molybdenum high-chromium high-nitrogen steel and slab |
| CN112011730B (en) * | 2019-05-29 | 2022-03-18 | 宝山钢铁股份有限公司 | Slab continuous casting process for high-molybdenum high-chromium high-nitrogen steel and slab |
| CN114075640A (en) * | 2020-08-13 | 2022-02-22 | 宝武特种冶金有限公司 | High-corrosion-resistance austenitic stainless steel and manufacturing method thereof |
| CN115976417A (en) * | 2023-02-17 | 2023-04-18 | 东北大学 | High-nitrogen low-molybdenum super austenitic stainless steel and preparation method thereof |
| CN115976417B (en) * | 2023-02-17 | 2024-04-19 | 东北大学 | High-nitrogen low-molybdenum super austenitic stainless steel and preparation method thereof |
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