CN114000057A - Steel for MC6C roller smelted by adding rare earth and smelting continuous casting process thereof - Google Patents
Steel for MC6C roller smelted by adding rare earth and smelting continuous casting process thereof Download PDFInfo
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- CN114000057A CN114000057A CN202111266674.2A CN202111266674A CN114000057A CN 114000057 A CN114000057 A CN 114000057A CN 202111266674 A CN202111266674 A CN 202111266674A CN 114000057 A CN114000057 A CN 114000057A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000009749 continuous casting Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 title claims abstract description 18
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 16
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 23
- 239000011651 chromium Substances 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 238000010079 rubber tapping Methods 0.000 claims description 17
- 229910052786 argon Inorganic materials 0.000 claims description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000007872 degassing Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009849 vacuum degassing 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/18—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
-
- 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
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a smelting continuous casting process for rare earth smelted MC6C roller steel, which adopts EAF-LF-VD-CC vertical continuous casting process, wherein the MC6C roller steel comprises the following components in percentage by weight: [C] 0.85-0.90 percent of [ Si ], [ Si ] 0.80-1.00 percent of [ Mn ], [ Mn ] 0.25-0.50 percent of [ P ] less than or equal to 0.020 percent of [ S ], [ Cr ] less than or equal to 0.015 percent of [ Cr ], [ Cr ] 5.80-6.20 percent of [ Mo ], [ Mo ] 0.40-0.60 percent of [ Ni ], [ Ni ] 0.30-0.40 percent of [ V ] 0.10-0.20 percent of [ V ], [ Cu ] less than or equal to 0.25 percent of [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ] less than or equal to 0.020 percent, the casting blank is detected by [ H ], [ O ] less than or equal to 30ppm of [ N ] less than or equal to 130ppm, an electric furnace is used for melting iron materials to obtain primary molten steel, a refining furnace is used for adjusting alloy components, VD after proper components are used, VD is added before vacuum relief, 0.17-22 Kg of VD is added, the steel is less than or equal to 130ppm of N is less than or equal to 130ppm, after continuous casting, the degassing is better, the components are used for continuous casting, the continuous casting of MC is used for producing qualified MC, and the MC is suitable for continuous casting and the continuous casting for MC is obtained.
Description
Technical Field
The invention belongs to the technical field of steel making, and relates to rare earth smelted MC6C roller steel with high wear resistance and high accident rate and a smelting continuous casting process thereof.
Background
The MC6C steel is steel for a roller, the Cr content is improved by 1 percent compared with the MC5, the MC6C steel has better wear resistance and accident resistance rate, is an upgraded material, has been used as a conventional spare part material by some large-scale steel enterprises, and has a certain application prospect. However, the roll blank product has large use specification and high quality requirement, and ultrasonic flaw detection and control of network carbide are key points and difficulties of the product. Therefore, the quality of the original material is ensured through the optimized design of chemical components and the advanced smelting process, a high-quality metallurgical material foundation is provided for the final quality of the product to reach the standard, and the method is a target pursued by enterprises.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the rare earth-smelted MC6C roller steel and the smelting continuous casting process thereof, wherein a proper amount of rare earth elements are added into the MC6C steel, the crystal grains of the MC6C steel are refined, the wear resistance of the MC6C steel is improved, and the service performance of the roller steel is optimized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the rare earth-added smelted steel for the MC6C roller adopts the process route of EAF-LF-VD-CC vertical continuous casting, and the steel for the MC6C roller comprises the following components in percentage by weight: [C] 0.85 to 0.90 percent, 0.80 to 1.00 percent of [ Si ], 0.25 to 0.50 percent of [ Mn ], less than or equal to 0.020 percent of [ P ], less than or equal to 0.015 percent of [ S ], 5.80 to 6.20 percent of [ Cr ], 0.40 to 0.60 percent of [ Mo ], 0.30 to 0.40 percent of [ Ni ], 0.10 to 0.20 percent of [ V ], less than or equal to 0.25 percent of [ Cu ], less than or equal to 0.020 percent of [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ], and less than or equal to 1.5ppm of casting blank detection [ H ], [ O ], [ 30ppm and less than or equal to 130ppm of [ N ].
A smelting continuous casting process of MC6C roller steel smelted by adding rare earth comprises the following specific steps:
step 1), adding scrap steel, steel scraps and a stub bar into an EAF furnace to serve as a steel material, feeding electricity to melt the scrap steel, the steel scrap and the stub bar, adding 10-20 Kg/ton of carburant during melting, adding 25-35 Kg/ton of lime after melting, and blowing oxygen until the oxygen blowing amount reaches 15m3T slag flowing, sampling at the temperature of more than or equal to 1580 ℃, and controlling steel tapping according to weight percentage [ C]≤0.60％，[P]≤0.005％，[Ni]≤0.35％，[V]≤0.20％，[Cu]≤0.25％，[As]、[Sn]、[Pb]、[Sb]、[Bi]The mass percentage of the steel is less than or equal to 0.020%, the tapping temperature is controlled to be 1630-1660 ℃, 1-3 kg/t of aluminum blocks, 4-7 kg/t of lime, 2-4 kg/t of ferrosilicon, 1-2 kg/t of high-carbon ferromanganese and 25-35 kg/t of high-carbon ferrochrome are added into a ladle in the tapping process, and the steel is transferred into an LF furnace after tapping;
step 2), putting an argon gas vent plug into the LF furnace in place, adjusting the argon gas flow by 20-200 Nl/min, adding 10-15 Kg/t of lime, 1-2 Kg/t of calcium carbide, 1-2 Kg/t of carbon powder and 1-2 Kg/t of ferrosilicon powder, transmitting power for 20min for sampling, adding 8-9 Kg/t of ferrosilicon in batches to adjust the Si content, adding 3-6 Kg/t of high-carbon ferromanganese to adjust the Mn content, adding 80-85 Kg/t of high-carbon ferrochromium to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 3-4 Kg/tNi plate to adjust the Ni content, adding 2-4 Kg/t of ferrosilicon to adjust the V content, adding 7-10 Kg/t of ferromolybdenum to adjust the Mo content, adding the alloy amount in each batch to be less than or equal to 3 tons, transmitting power after adjusting the alloy in each batch for 15-20 min for sampling, adding 1-2 Kg/t of ferrosilicon and 1-2 Kg/t of deoxidizing powder in each time during each time of power transmission, controlling 0.85-0.90% of [ C ], 0.80-1.00% of [ Si ], 0.25-0.50% of [ Mn ], less than or equal to 0.020% of [ P ], less than or equal to 0.015% of [ S ], 5.80-6.20% of [ Cr ], 0.40-0.60% of [ Mo ], 0.30-0.40% of [ Ni ], 0.10-0.20% of [ V ], less than or equal to 0.25% of [ Cu ], switching to VD at the temperature of 1580-1610 ℃, feeding an Al wire according to the content of Al sampled at the last time before air extraction, adjusting 0.020-0.035% of Al before VD according to weight percentage, and switching to a VD furnace for air extraction;
step 3), after the VD furnace is in place, an argon gas permeable plug is connected, the flow of argon gas is adjusted to be 20-50 Nl/min, the temperature is measured to be 1580-1610 ℃, a VD tank cover is buckled, a primary pump is started, a secondary pump and a tertiary pump are started step by step at intervals of 2-4 min, the flow of argon gas is adjusted to be 100-150 Nl/min when the vacuum degree reaches 0.7mbar, the holding time is not less than 20min under 0.7mbar, 0.17-0.22 Kg/t of rare earth is added before vacuum release, then the air is broken and the cover is lifted, sampling, [ H ], [ O ] and gas sample are taken to detect the content of [ N ], 0.85-0.90% of [ C ], 0.80-1.00% of [ Si ], 0.25-0.50% of [ Mn ], 0.020% of [ P ], 0.015% of [ S ] and 0.015% of [ Cr ], 5.80-6.20% of [ Cu ], 0.40-0.60% of [ Mo ], 0.30.30.30.30% of [ Sn ] and 0.25-0.40% of [ 10 ] of [ Sn ] by weight percentage of [ 10 ] of Cu ], 0.015% of [ Cr ] are controlled according to percentage, Both [ Sb ] and [ Bi ] are less than or equal to 0.020%, both [ H ] and [ Bi ] are less than or equal to 1.5ppm, [ O ] is less than or equal to 5ppm, gas sample [ N ] is less than or equal to 80ppm, the weak stirring time is more than or equal to 15min, the first furnace tapping temperature is 1510-1520 ℃, the second tapping temperature of the continuous casting furnace is 1500-1510 ℃, and the steel is cast in a rotating and vertical continuous casting manner;
step 4), casting steel by vertical continuous casting, wherein the superheat degree of a continuous casting tundish is 15-25 ℃, the set drawing speed is 0.20m/min, the water quantity of a crystallizer is 3500L/min, a secondary cooling system adopts strong cooling, and the electric stirring parameters of the crystallizer are as follows: current 500A, frequency 5HZ, casting current electrical stirring parameters: current 200A, frequency 4HZ, using H-4 mold flux;
and 5) performing ejection cooling, and adopting an annealing cooling system.
In the step 1), the used scrap steel, steel scraps and stub bars are steel materials without oil stains or severe rust.
In the step 2), the content of [ P ] in the alloy is analyzed by using the high-carbon high-chromium high-carbon ferromanganese alloy before use, and the final [ P ] of the molten steel is controlled to be less than or equal to 0.020%.
The technical scheme of the invention has the following positive effects: the invention adopts the process route of EAF-LF-VD-CC vertical continuous casting, and the raw materials comprise high-quality steel scraps, steel materials such as scrap steel, steel scraps, stub bars and the like, and high-carbon ferrochrome, high-carbon ferromanganese, ferrosilicon, ferromolybdenum, ferrovanadium, Ni plates and the like. Melting iron and steel materials in an electric furnace to obtain primary molten steel with [ C ] less than or equal to 0.60%, [ P ] less than or equal to 0.005%, and [ Ni ] less than or equal to 0.35%, and [ V ] less than or equal to 0.20%, and [ Cu ] less than or equal to 0.25%, and [ As ], [ Sn ], [ Pb ], [ Sb ], and [ Bi ] less than or equal to 0.020%, performing slag formation, deoxidation, desulfurization, and alloy element adjustment after refining, adjusting the temperature to obtain primary molten steel with [ C ] of 0.85-0.90%, [ Si ] of 0.80-1.00%, [ Mn ] of 0.25-0.50%, and [ P ] less than or equal to 0.020%, and [ S ] less than or equal to 0.015%, and [ Cr ] of 5.80-6.20%, and [ Mo ] of 0.40-0.60%, and [ Ni ] of 0.30.40%, and [ V ] of 0.10.10%, and [ Cr ] of 0.20-0.20.20%, and removing rare earth from [ Cu ] of 0.20%, and removing the gas of 0.20% -0.20%, and 1.20% of [ Mo ] before vacuum degassing of [ C ],25-0.20%, and [ Cu ] of 0.20%, and removing the rare earth in the primary molten steel with [ Cu ] of 0.20%, and 1.20% of the rare earth of [ Cu, the final molten steel with [ P ] less than or equal to 0.020%, [ S ] less than or equal to 0.015%, [ Cr ] 5.80-6.20%, [ Mo ] 0.40-0.60%, [ Ni ] 0.30-0.40%, [ V ] 0.10-0.20%, [ Cu ] less than or equal to 0.25%, [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ] less than or equal to 0.020%, fixed [ H ] less than or equal to 1.5ppm, fixed [ O ] less than or equal to 5ppm and gas sample [ N ] less than or equal to 80ppm is formed by adopting vertical continuous casting, the superheat degree of a continuous casting tundish is controlled at 15-25 ℃, the drawing speed is set at 0.20m/min, the water quantity of the crystallizer is 3500L/min, strong cooling is adopted in a secondary cooling system, and the electric stirring parameters of the crystallizer are As follows: current 500A, frequency 5HZ, casting current electrical stirring parameters: the current is 200A, the frequency is 4HZ, H-4 covering slag is used, annealing treatment is carried out, and finally the continuous casting billet with qualified components and surface quality is obtained. The smelting process is suitable for vertical continuous casting production of MC6C steel, and has the following advantages: (1) controlling lower contents of [ O ] and [ N ]; (2) vertical continuous casting is beneficial to floating of molten steel inclusions and improvement of internal quality of continuous casting billets; (3) the straightening crack generated by the straightening of the arc continuous casting through the straightening machine is avoided, the steel drawing at low drawing speed can be realized, and the improvement of the core quality of the continuous casting billet is facilitated. (4) The rare earth elements are added into the steel grade, so that the grains are favorably refined, and the MC6C performance of the steel for the roller is improved.
Detailed Description
Example 1: a rare earth smelted MC6C roller steel and smelting continuous casting process thereof adopt EAF-LF-VD-CC vertical continuous casting process route, and MC6C comprises the following components: [C] 0.85 to 0.90 percent, 0.80 to 1.00 percent of [ Si ], 0.25 to 0.50 percent of [ Mn ], less than or equal to 0.020 percent of [ P ], less than or equal to 0.015 percent of [ S ], 5.80 to 6.20 percent of [ Cr ], 0.40 to 0.60 percent of [ Mo ], 0.30 to 0.40 percent of [ Ni ], 0.10 to 0.20 percent of [ V ], less than or equal to 0.25 percent of [ Cu ], less than or equal to 0.25 percent of [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ], less than or equal to 0.020 percent of casting blank detection [ H ], [ 1.5ppm of [ O ], [ 30ppm of [ N ] and less than or equal to 130ppm, and the smelting process comprises the following steps:
step 1), adding 320-360 Kg/t of scrap steel, 540-650 Kg/t of steel scrap, 200-240 Kg/t of stub bar and other steel materials into an EAF furnace, transmitting power to melt, adding 10-20 Kg/ton of carburant during melting, adding 25-35 Kg/ton of lime after melting down, blowing oxygen, wherein the oxygen blowing amount reaches 15m3/t of slag, sampling at the temperature of more than or equal to 1580 ℃, controlling [ C ] to be less than or equal to 0.60%, [ P ] to be less than or equal to 0.005%, [ Ni ] to be less than or equal to 0.35%, [ V ] to be less than or equal to 0.20%, [ Cu ] to be less than or equal to 0.25%, [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ] to be less than or equal to 0.020%, controlling the tapping temperature to 1630-0 ℃, adding 1-3 Kg/t of aluminum blocks, 4-7 Kg/t of lime, 2-4 Kg/t of ferrosilicon, 1-2 Kg/t of high-carbon ferromanganese and 25-35 Kg/t of high-carbon ferrochrome into a ladle in the tapping process, and transferring the ladle to an LF furnace after tapping.
Step 2), putting an LF in place, connecting an argon gas vent plug, adjusting the argon gas flow by 20-200 Nl/min, adding 400-600 Kg of lime, 1-2 Kg/t of calcium carbide, 1-2 Kg/t of carbon powder and 1-2 Kg/t of ferrosilicon powder, carrying out power transmission for 20min for sampling, adding 8-9 Kg/t of ferrosilicon in batches to adjust the Si content, adding 3-6 Kg/t of high-carbon ferromanganese to adjust the Mn content, adding 80-85 Kg/t of high-carbon ferrochrome to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 3-4 Kg/t of Ni plate to adjust the Ni content, adding 2-4 Kg/t of ferrovanadium to adjust the V content, adding 7-10 Kg/t of ferromolybdenum to adjust the Mo content, adding the alloy amount in each batch to be less than or equal to 3 tons, carrying out power transmission for 15-20 min for sampling after each batch of alloy adjustment, adding 1-2 Kg/t of ferrosilicon powder and 1-2 Kg/t of deoxidizing powder in each power transmission period, controlling 0.85-0.90% of [ C ], 0.80-1.00% of [ Si ], 0.25-0.50% of [ Mn ], [ P ] less than or equal to 0.020%, [ S ] less than or equal to 0.015%, 5.80-6.20% of [ Cr ], [ Mo ] 0.40-0.60%, 0.30-0.40% of [ Ni ], [ V ] 0.10-0.20%, and [ Cu ] less than or equal to 0.25%, feeding into VD at the temperature of 1580-1610 ℃, feeding into VD according to the Al content of the Al wire sampled at the last time before air extraction, adjusting 0.020-0.035% of Al before VD, and performing VD air extraction.
Step 3), after VD is in place, connecting an argon gas permeable plug, adjusting the argon gas flow to be 20-50 Nl/min, measuring the temperature to be 1580-1610 ℃, buckling a VD tank cover, starting a primary pump, starting a secondary pump and a tertiary pump step by step at intervals of 2-4 min, adjusting the argon gas flow to be 100-150 Nl/min when the vacuum degree reaches 0.7mbar, keeping the vacuum degree to be more than or equal to 20min under 0.7mbar, breaking the air and lifting the cover after 0.17-0.22 Kg/t of rare earth is added before vacuum release, sampling, determining [ H ], determining [ O ], taking a gas sample to detect the content of [ N ], controlling [ C ] to be 0.85-0.90%, [ Si ] to 0.80-1.00%, [ Mn ] to 0.25-0.50%, [ P ] to be less than or equal to 0.020%, [ S ] to be less than or equal to 0.015%, [ Cr ] to 5.80-6.20%, [ Mo ] to 0.40%, [ Ni ] to 0.30.30, Pb, and [ 10 ] to 0.20% and [ Bi ] to be equal to 0.20, the fixed [ H ] is less than or equal to 1.5ppm, the fixed [ O ] is less than or equal to 5ppm, the gas sample [ N ] is less than or equal to 80ppm, the weak stirring time is more than or equal to 15min, the first furnace tapping temperature is 1510-1520 ℃, the second furnace tapping temperature of continuous casting is 1500-1510 ℃, and the rotary vertical type continuous casting is used for casting steel.
Step 4), casting steel by vertical continuous casting, wherein the superheat degree of a continuous casting tundish is 15-25 ℃, the set drawing speed is 0.20m/min, the water quantity of a crystallizer is 3500L/min, a secondary cooling system adopts strong cooling, and the electric stirring parameters of the crystallizer are as follows: current 500A, frequency 5HZ, casting current electrical stirring parameters: the current was 200A, the frequency was 4HZ, and H-4 mold flux was used.
And 5) performing ejection cooling, and adopting an annealing cooling system.
Four-furnace smelting is carried out according to the smelting process of the embodiment, and the chemical component content of the product obtained by the four-furnace smelting meets the target requirement in Table 1:
table 1 chemical composition m%
The smelting process is suitable for smelting the steel MC6C for the roller produced by vertical continuous casting.
Claims (4)
1. The rare earth smelted steel for the MC6C roller is characterized in that: by adopting the process route of EAF-LF-VD-CC vertical continuous casting, the MC6C roller steel comprises the following components in percentage by weight: [C] 0.85 to 0.90 percent, 0.80 to 1.00 percent of [ Si ], 0.25 to 0.50 percent of [ Mn ], less than or equal to 0.020 percent of [ P ], less than or equal to 0.015 percent of [ S ], 5.80 to 6.20 percent of [ Cr ], 0.40 to 0.60 percent of [ Mo ], 0.30 to 0.40 percent of [ Ni ], 0.10 to 0.20 percent of [ V ], less than or equal to 0.25 percent of [ Cu ], less than or equal to 0.020 percent of [ As ], [ Sn ], [ Pb ], [ Sb ] and [ Bi ], and less than or equal to 1.5ppm of casting blank detection [ H ], [ O ], [ 30ppm and less than or equal to 130ppm of [ N ].
2. A smelting continuous casting process of MC6C roller steel smelted by adding rare earth is characterized in that: the method comprises the following specific steps:
step 1), adding scrap steel, steel scraps and a stub bar into an EAF furnace to serve as a steel material, feeding electricity to melt the scrap steel, the steel scrap and the stub bar, adding 10-20 Kg/ton of carburant during melting, adding 25-35 Kg/ton of lime after melting, and blowing oxygen until the oxygen blowing amount reaches 15m3T slag flowing, sampling at the temperature of more than or equal to 1580 ℃, and controlling steel tapping according to weight percentage [ C]≤0.60%，[P]≤0.005%，[Ni]≤0.35%，[V]≤0.20%，[Cu]≤0.25%，[As]、[Sn]、[Pb]、[Sb]、[Bi]The mass percentage of the steel is less than or equal to 0.020%, the tapping temperature is controlled to be 1630-1660 ℃, 1-3 kg/t of aluminum blocks, 4-7 kg/t of lime, 2-4 kg/t of ferrosilicon, 1-2 kg/t of high-carbon ferromanganese and 25-35 kg/t of high-carbon ferrochrome are added into a ladle in the tapping process, and the steel is transferred into an LF furnace after tapping;
step 2), putting an argon gas vent plug into the LF furnace in place, adjusting the argon gas flow by 20-200 Nl/min, adding 10-15 Kg/t of lime, 1-2 Kg/t of calcium carbide, 1-2 Kg/t of carbon powder and 1-2 Kg/t of ferrosilicon powder, transmitting power for 20min for sampling, adding 8-9 Kg/t of ferrosilicon in batches to adjust the Si content, adding 3-6 Kg/t of high-carbon ferromanganese to adjust the Mn content, adding 80-85 Kg/t of high-carbon ferrochromium to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 3-4 Kg/tNi plate to adjust the Ni content, adding 2-4 Kg/t of ferrovanadium to adjust the V content, adding 7-10 Kg/t of ferromolybdenum to adjust the Mo content, adding the alloy amount in each batch to be less than or equal to 3 tons, transmitting power for 15-20 min for sampling after adjusting the alloy in each batch, adding 1-2 Kg/t of carbon powder and 1-2 Kg/t of ferrosilicon powder to deoxidize in each period, controlling 0.85-0.90% of [ C ], 0.80-1.00% of [ Si ], 0.25-0.50% of [ Mn ], less than or equal to 0.020% of [ P ], less than or equal to 0.015% of [ S ], 5.80-6.20% of [ Cr ], 0.40-0.60% of [ Mo ], 0.30-0.40% of [ Ni ], 0.10-0.20% of [ V ], less than or equal to 0.25% of [ Cu ], transferring to VD at 1580-1610 ℃ after power transmission, feeding an Al wire according to the content of the Al sampled at the last time before air extraction, transferring to VD at 0.020-0.035% before adjusting the weight percentage, and transferring to furnace for air extraction;
step 3), after the VD furnace is in place, an argon gas permeable plug is connected, the flow of argon gas is adjusted to be 20-50 Nl/min, the temperature is measured to be 1580-1610 ℃, a VD tank cover is buckled, a primary pump is started, a secondary pump and a tertiary pump are started step by step at intervals of 2-4 min, the flow of argon gas is adjusted to be 100-150 Nl/min when the vacuum degree reaches 0.7mbar, the holding time is not less than 20min under 0.7mbar, 0.17-0.22 Kg/t of rare earth is added before vacuum release, then the air is broken and the cover is lifted, sampling, [ H ], [ O ] and gas sample are taken to detect the content of [ N ], 0.85-0.90% of [ C ], 0.80-1.00% of [ Si ], 0.25-0.50% of [ Mn ], 0.020% of [ P ], 0.015% of [ S ] and 0.015% of [ Cr ], 5.80-6.20% of [ Cu ], 0.40-0.60% of [ Mo ], 0.30.30.30.30% of [ Sn ] and 0.25-0.40% of [ 10 ] of [ Sn ] by weight percentage of [ 10 ] of Cu ], 0.015% of [ Cr ] are controlled according to percentage, Both [ Sb ] and [ Bi ] are less than or equal to 0.020%, both [ H ] and [ Bi ] are less than or equal to 1.5ppm, [ O ] is less than or equal to 5ppm, gas sample [ N ] is less than or equal to 80ppm, the weak stirring time is more than or equal to 15min, the first furnace tapping temperature is 1510-1520 ℃, the second tapping temperature of the continuous casting furnace is 1500-1510 ℃, and the steel is cast in a rotating and vertical continuous casting manner;
step 4), casting steel by vertical continuous casting, wherein the superheat degree of a continuous casting tundish is 15-25 ℃, the set drawing speed is 0.20m/min, the water quantity of a crystallizer is 3500L/min, a secondary cooling system adopts strong cooling, and the electric stirring parameters of the crystallizer are as follows: current 500A, frequency 5HZ, casting current electrical stirring parameters: current 200A, frequency 4HZ, using H-4 mold flux;
and 5) performing ejection cooling, and adopting an annealing cooling system.
3. The smelting continuous casting process of the steel for the rare earth-added MC6C roller, according to claim 2, is characterized in that: in the step 1), the used scrap steel, steel scraps and stub bars are steel materials without oil stains or severe rust.
4. The smelting continuous casting process of the steel for the rare earth-added MC6C roller, according to claim 2, is characterized in that: in the step 2), the content of [ P ] in the alloy is analyzed by using the high-carbon high-chromium high-carbon ferromanganese alloy before use, and the final [ P ] of the molten steel is controlled to be less than or equal to 0.020%.
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| JP2004225097A (en) * | 2003-01-22 | 2004-08-12 | Kanto Special Steel Works Ltd | Composite intermediate roll made by centrifugal casting |
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