CN106435368A - Production method of anti-delayed-fracture and superhigh-strength steel plate - Google Patents

Production method of anti-delayed-fracture and superhigh-strength steel plate Download PDF

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CN106435368A
CN106435368A CN201611057390.1A CN201611057390A CN106435368A CN 106435368 A CN106435368 A CN 106435368A CN 201611057390 A CN201611057390 A CN 201611057390A CN 106435368 A CN106435368 A CN 106435368A
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steel
rolling
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CN106435368B (en
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张青学
汤伟
刘丹
高擎
李玉路
杨云清
杨俊�
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Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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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
    • 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
    • C21C7/10—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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention provides a production method of an anti-delayed-fracture and superhigh-strength steel plate. The production technical process of steel comprises: molten steel pretreatment, converter smelting, LF (Ladle Furnace) external refining, VD (Vacuum Degassing) vacuum treatment, casting, heating, rolling, quenching, tempering, finishing, performance examination and flaw detection. The production method is characterized in that the steel comprises the following chemical components in a percent content: 0.14-0.20 of C, 0.15-0.35 of Si, 1.0-1.50 of Mn, smaller than or equal to 0.015 of P, smaller than or equal to 0.003 of S, 0.020-0.040 of Nb, 0.040-0.070 of V, 0.010-0.025 of Ti, 0.020-0.045 of Als, 0.10-0.60 of Cr, 0.30-0.70 of Mo, 0.20-0.50 of Ni, 0.0008-0.0025 of B, smaller than or equal to 0.53 of CEV and the balance of Fe and other elements, and the steel further comprises the following gas in a content: smaller than or equal to 0.0002% of H, smaller than or equal to 0.005% of N, and smaller than or equal to 0.0015% of O. The steel plate produced by the method does not need to be preheated before flame cutting and plasma cutting and does not need heat preservation or post-heating after being cut. The cutting surface is great in quality and is free of flaws under liquid penetrant tests.

Description

A kind of production method of anti-delayed fracture ultrahigh-strength steel plates
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of production method of anti-delayed fracture ultrahigh-strength steel plates.
Background technology
As engineering machinery quantifies and lightweight development to big, super-high strength steel is used widely.At present in the world Super-high strength steel carbon equivalent height, cold cracking inclination is big, requires the pre-heat treatment, typically take and add a cover thermal insulating material after cutting before cutting stock Material is incubated or is avoided producing cold crack by stress-relieving by beat treatment.After the front preheating of cutting, cutting, heat treatment can increase the energy Consume and production cost；Meanwhile, the increase of manufacturing procedure, considerable influence is produced to the production efficiency of enterprise.
For energy saving cost, improve production efficiency, part construction machinery production enterprise save before cutting stock plus Thermal technology's sequence, is not incubated after cutting or not heat treatment, causes to cut face colouring or magnetic powder inspection does not conform to, defect be Micro-crack at 1/2, crackle is more straight, assumes typical stress cracking feature.The reason for producing this defect has：First, steel There is the defect for causing stress concentration, such as non-metallic inclusion, loose and pore etc. in plate；Second, internal stress is big：Carbon equivalent high Unimach in heating and cooling because of the thermal stress that the asynchronous generation that expands with heat and contract with cold is larger, there is geneva in cooling procedure Body and bainitic transformation produce transformation stress, and both stress is mingled with steel plate and waits fault location generation stress concentration, works as stress Then ftracture during more than its tensile strength, this crack depth need to be carried out polishing and remedy, cause typically between 0.5-1mm Process cost increases, or even part such as scraps at the consequence.
For meeting the market requirement, the harsh use condition of client being met, need to improve Molten Steel Cleanliness, reduces material internal and lack Fall into, so as to improve material anti-delayed fracture performance.The present invention reduces generation cold cracking inclination from composition design, by rational essence Sweetening process is controlled to field trash, is coordinated rationally rolling and heat treatment technics, is produced with good anti-delayed fracture performance Clean steel, and realize batch production.
Content of the invention
The present invention is intended to provide a kind of production method of anti-delayed fracture ultrahigh-strength steel plates, makes produced steel plate in flame Without the need for preheating before cutting and plasma cutting, insulation or rear heat after cutting, is not required to, quality of cut face is good, and dye penetrant inspection is intact Fall into.
Technical scheme：
A kind of production method of anti-delayed fracture ultrahigh-strength steel plates, the production process route of steel is：Molten iron pretreatment → converter Smelting → LF external refining → VD application of vacuum → continuous casting → heating → rolling → quenching → tempering → finishing → service check → Flaw detection, it is characterised in that：The chemical composition percentage composition of steel is：C=0.14 ~ 0.20, Si=0.15～0.35, Mn=1.0～ 1.50, P≤0.015, S≤0.003, Nb=0.020 ~ 0.040, V=0.040 ~ 0.070, Ti=0.010 ~ 0.025, Als=0.020 ～0.045, Cr=0.10～0.60, Mo=0.30～0.70, Ni=0.20 ~ 0.50, B=0.0008 ~ 0.0025, CEV≤0.53, Balance of Fe and other trace element, gas content H≤0.0002%, N≤0.005%, O≤0.0015%；Walk including following process Suddenly：
（1）Converter tapping process adds enough silicomangans and aluminium alloy, and carries out wash heat using synthetic slag, after tapping terminates Feeding aluminum steel, Als% >=0.040% in control molten steel.
（2）LF smelting process adopts CaO, CaC2、Al2O3Slag making, and by spreading aluminum shot to the top of the slag and feeding aluminum steel to molten steel Deoxidation；Smelting process whole process Argon, carries out big 5 ~ 10 min of argon strong mixing after making white slag；Feeding calcium line 100 before molten steel outbound ~ 200m；Control Als% >=0.060%, sulfur content≤0.005% in molten steel at the end of LF smelting.
（3）Molten steel whole blowing argon gas in VD vacuum process, keep 12～20min, really under 50～70Pa pressure Protect hydrogen content in molten steel to control below 0.0002%, sulfur content≤0.003%；80 ~ 150m of calcium line is fed after vacuum breaker, control calcium Sulfur keeps soft blow 15～30min of state than Ca/S >=1.2.
（4）During continuous casting, big bag long nozzle and submersed nozzle take argon gas-sealed, clad plate in middle bag use Completely cut off air with middle covering agent.
（5）Slab heating temperature control at 1170～1250 DEG C, roughing start rolling temperature >=1070 DEG C, the operation of rolling adopts two Stage big pressure rolling, roughing must assure that three percentage pass reductions more than 20%；Finish rolling start rolling temperature between 880 ~ 900 DEG C, Finishing temperature is quickly cooled down by Mulpic after rolling, 30 ~ 35 DEG C/S of cooldown rate between 800 ~ 850 DEG C, and final cooling temperature 200 ~ 350℃.
（6）Quenching：890～910 DEG C, the cool time is thickness of slab mm × (1.8～2.1) min/mm, water-cooled.
（7）Tempering：Shove charge tempering in 24 hours after steel plate quenching；580～640 DEG C of temperature, tempering time is thickness of slab Mm × (2.0～2.5) min/mm, air cooling.
The present invention is by the technique adjustment such as converter smelting, LF refining and application of vacuum, it is ensured that Molten Steel Cleanliness, and passes through The precipitation of MnS during the control suppression continuous casting and solidifying of calcium sulfur ratio；Continuous casting low overheat, argon for protecting pouring, reasonable slighter compress Using producing high-quality slab；The abundant crystal grain thinning of the big pressure rolling of two benches；After quenching, steel plate high tempering fully disappears De-stress.Final produced steel plate is not required to insulation or rear heat, cuts without the need for preheating before flame cutting and plasma cutting after cutting Face quality is good, dye penetrant inspection zero-fault.So the present invention has advantages below：Low-carbon-equivalent is designed, and is produced cold crack and is inclined To little；Plate blank coarse micro-grain quality is good, C class center segregation≤1.0 grade；Molten Steel Cleanliness height, thick system is mingled with grade≤0.5, thin system's folder Miscellaneous grade≤1.0 grade, H≤0.0002, N≤0.005, O≤0.0015；Suitably roll and Technology for Heating Processing, steel plate crystal grain is thin Little, residual stress is little；Preheating is not required to before steel plate plasma cutting or flame cutting, is not required to insulation or heat treatment, cutting after cutting Face colouring flaw detection zero defect.
Description of the drawings
Fig. 1 is the not pre- thermal cutting dye penetrant inspection photo of common ultrahigh-strength steel plates.
Fig. 2 is the not pre- thermal cutting crack defect metallograph of common ultrahigh-strength steel plates.
Fig. 3 is plate blank coarse micro-grain photo.
Fig. 4 is 16mm anti-delayed fracture ultrahigh-strength steel plates dye penetrant inspection photo.
Fig. 5 is 50mm anti-delayed fracture ultrahigh-strength steel plates dye penetrant inspection photo.
Specific embodiment
Present disclosure is further illustrated with reference to embodiment.
Embodiment one：Refining 16mm ultrahigh-strength steel plates
The composition content mass percent of steel is：C=0.15, Si=0.28, Mn=1.35, P=0.011, S=0.0021, Nb= 0.030, V=0.055, Ti=0.020, Als=0.040, Cr=0.17, Mo=0.32, Ni=0.32, B=0.0018, CEV=0.51, Balance of Fe and other trace element.Gas content：H=0.00015, N=0.0032, O=0.0012.
The production craft step of steel is：
（1）Converter tapping process adds silicomangan 2115kg and 212kg ferro-aluminum deoxidation, 403kg Calx, 105kg synthetic slag, takes off Oxygen agent and synthesis slag charge are initially added in tapping a quarter, and tapping is added to 3/4ths.The Al line of 230m is fed after tapping, Als content 0.045.
（2）Molten steel enters the smelting of LF stove, adds Calx and synthetic slag according to the 7.5kg/t quantity of slag, and adds 40kgCaC2With 100kgAl grain is diffused deoxidation, initial smelting period～mid-term feeding 300m length Al line, Als content 0.065 in molten steel.LF smelting Refining latter stage feeds pure calcium line 150m, soft blow 10min, sulfur content 0.0045 in molten steel.
（3）Molten steel enters VD carries out application of vacuum, whole blowing argon gas in processing procedure, keeps 15min, steel under 65Pa pressure H content 1.5ppm in water；Sulfur content 0.0018；Calcium line 120m, calcium sulfur ratio Ca/S=1.4 are fed after vacuum breaker, keep soft blow state 18min.
（4）12～15 DEG C of the continuous casting degree of superheat, whole argon for protecting pouring.
（5）Rolling：Steel slab, 1200 DEG C of heating-up temperature, 1090 DEG C of start rolling temperature, continuous three percentage pass reduction of roughing divides Wei 20.7%, 22.6%, 24.5%.890 DEG C of finish rolling start rolling temperature, 840 DEG C of finishing temperature, 270 DEG C of final cooling temperature.
（6）Quenching：32min at a temperature of 890 DEG C, water-cooled.
（7）Tempering：It is tempered after 0.5 hour after steel plate quenching, 35min at a temperature of 610 DEG C, air cooling.
（8）Mechanical performance test such as table 1.
（9）Steel plate is qualified according to I grade of GB/T2970 standard flaw detection；Flame cutting face colouring flaw detection zero-fault.
1 embodiment of table, one 16mm ultrahigh-strength steel plates mechanical performance detection data
Embodiment two：Refining 50mm ultrahigh-strength steel plates
The composition content mass percent of steel is：C=0.14, Si=0.25, Mn=1.38, P=0.012, S=0.0018, Nb= 0.025, V=0.053%, Ti=0.022, Als=0.042, Cr=0.20, Mo=0.40, Ni=0.33, B=0.0017, CEV=0.52, Balance of Fe and other trace element.Gas content：H=0.00013, N=0.0036, O=0.0009.
The production craft step of steel with parameter is：
（1）Converter tapping process adds silicomangan 2089kg and 215kg ferro-aluminum deoxidation, 408kg Calx, 110kg synthetic slag, takes off Oxygen agent and synthesis slag charge are initially added in tapping a quarter, and tapping is added to 3/4ths.The Al line of 220m is fed after tapping, Als content 0.042.
（2）Molten steel enters the smelting of LF stove, adds Calx and synthetic slag according to the 7.5kg/t quantity of slag, and adds 50kgCaC2With 90kgAl grain is diffused deoxidation, initial smelting period～mid-term feeding 320m length Al line, Als content 0.061 in molten steel.LF smelts Latter stage feeds pure calcium line 150m, soft blow 10min, sulfur content 0.003% in molten steel.
（3）Molten steel enters VD carries out application of vacuum, whole blowing argon gas in processing procedure, keeps 15min, steel under 65Pa pressure H content 1.3ppm in water；Sulfur content 0.0014%；Calcium line 105m, calcium sulfur ratio Ca/S=1.3 are fed after vacuum breaker, keep soft blow shape State 23min.
（4）10～13 DEG C of the continuous casting degree of superheat, whole argon for protecting pouring.
（5）Rolling：Steel slab, 1210 DEG C of heating-up temperature, 1090 DEG C of start rolling temperature, continuous three percentage pass reduction of roughing divides Wei 20.1%, 20.8%, 22.3%.880 DEG C of finish rolling start rolling temperature, 835 DEG C of finishing temperature, 300 DEG C of final cooling temperature.
（6）Quenching：90min at a temperature of 890 DEG C, water-cooled.
（7）Tempering：After steel plate quenching after 2 hours be tempered, 610 DEG C, 100min, air cooling.
（8）Mechanical performance test such as table 2.
（9）Steel plate is qualified according to I grade of GB/T2970 standard ultrasound wave inspection；Flame cutting face colouring flaw detection zero-fault.
2 embodiment of table, two 50mm ultrahigh-strength steel plates mechanical performance detection data

Claims (1)

1. a kind of production method of anti-delayed fracture ultrahigh-strength steel plates, the production process route of steel is：Molten iron pretreatment → turn Stove smelting → LF external refining → VD application of vacuum → continuous casting → heating → rolling → quenching → tempering → finishing → service check → flaw detection, it is characterised in that：The chemical composition percentage composition of steel is：C=0.14 ~ 0.20, Si=0.15～0.35, Mn=1.0～ 1.50, P≤0.015, S≤0.003, Nb=0.020 ~ 0.040, V=0.040 ~ 0.070, Ti=0.010 ~ 0.025, Als=0.020 ～0.045, Cr=0.10～0.60, Mo=0.30～0.70, Ni=0.20 ~ 0.50, B=0.0008 ~ 0.0025, CEV≤0.53, Balance of Fe and other trace element, gas content H≤0.0002%, N≤0.005%, O≤0.0015%；Walk including following process Suddenly：
（1）Converter tapping process adds enough silicomangans and aluminium alloy, and carries out wash heat using synthetic slag, after tapping terminates Feeding aluminum steel, Als% >=0.040% in control molten steel；
（2）LF smelting process adopts CaO, CaC2、Al2O3Slag making, and taken off by spreading aluminum shot and feeding aluminum steel to molten steel to the top of the slag Oxygen；Smelting process whole process Argon, carries out big 5 ~ 10 min of argon strong mixing after making white slag；Feeding calcium line 100 before molten steel outbound ~ 200m；Control Als% >=0.060%, sulfur content≤0.005% in molten steel at the end of LF smelting；
（3）Molten steel whole blowing argon gas in VD vacuum process, keep 12～20min, it is ensured that steel under 50～70Pa pressure In water, hydrogen content controls below 0.0002%, sulfur content≤0.003%；80 ~ 150m of calcium line is fed after vacuum breaker, control calcium sulfur ratio Ca/S >=1.2, keep soft blow 15～30min of state；
（4）During continuous casting, big bag long nozzle and submersed nozzle take argon gas-sealed, in middle bag use clad plate and in Covering agent completely cuts off air；
（5）Slab heating temperature control at 1170～1250 DEG C, roughing start rolling temperature >=1070 DEG C, the operation of rolling adopts two benches Big pressure rolling, roughing must assure that three percentage pass reductions more than 20%；Finish rolling start rolling temperature between 880 ~ 900 DEG C, finish to gauge Temperature is quickly cooled down by Mulpic after rolling, 30 ~ 35 DEG C/S of cooldown rate, final cooling temperature 200 ~ 350 between 800 ~ 850 DEG C ℃；
（6）Quenching：890～910 DEG C, the cool time is thickness of slab mm × (1.8～2.1) min/mm, water-cooled；
（7）Tempering：Shove charge tempering in 24 hours after steel plate quenching；580～640 DEG C of temperature, tempering time be thickness of slab mm × (2.0～2.5) min/mm, air cooling.
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CN107236901A (en) * 2017-06-30 2017-10-10 合肥博创机械制造有限公司 A kind of production technology of engineering machinery high strength steel
CN108359899A (en) * 2018-03-27 2018-08-03 本钢板材股份有限公司 A kind of super high strength construction steel BG960 and preparation method
CN108914006A (en) * 2018-08-10 2018-11-30 武汉钢铁集团鄂城钢铁有限责任公司 A kind of superhigh intensity hardened and tempered steel plate that thickness directional properties are excellent and its manufacturing method
CN109207858A (en) * 2018-11-22 2019-01-15 湖南华菱湘潭钢铁有限公司 A kind of production method of low-alloy super-strength steel Q1100E thin plate
CN109226941A (en) * 2018-11-22 2019-01-18 湖南华菱湘潭钢铁有限公司 A kind of GMAW welding method of low-alloy super-high strength steel Q1100E thin plate
CN109252107A (en) * 2018-11-30 2019-01-22 湖南华菱湘潭钢铁有限公司 A kind of production method of high straightness super-high strength steel
CN109295392A (en) * 2018-11-30 2019-02-01 湖南华菱湘潭钢铁有限公司 A kind of production method of great surface quality super-high strength steel
CN109355562A (en) * 2018-11-09 2019-02-19 丹阳市曙光特钢有限公司 A kind of production method of high-strength special type steel
CN110423946A (en) * 2019-09-02 2019-11-08 湖南华菱湘潭钢铁有限公司 A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate
CN110747385A (en) * 2019-11-06 2020-02-04 湖南华菱湘潭钢铁有限公司 Production method of high-toughness and fatigue-resistant Q1100 ultrahigh-strength steel
CN111254361A (en) * 2020-03-31 2020-06-09 湖南华菱湘潭钢铁有限公司 Production method of Q1100D/E extra-thin steel plate for high-strength structure
CN111349859A (en) * 2020-05-09 2020-06-30 安徽工业大学 Large-thickness 500 MPa-level high-Z-direction laminar-performance low-temperature container steel plate rolled by composite blank and manufacturing method thereof
CN116695001A (en) * 2023-06-30 2023-09-05 武汉钢铁有限公司 Manufacturing method for improving delayed cracking resistance of heavy rail steel

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