CN106086298A - A kind of smelting process of low-phosphorous low titanium low-sulfur steel - Google Patents
A kind of smelting process of low-phosphorous low titanium low-sulfur steel Download PDFInfo
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- CN106086298A CN106086298A CN201610480900.XA CN201610480900A CN106086298A CN 106086298 A CN106086298 A CN 106086298A CN 201610480900 A CN201610480900 A CN 201610480900A CN 106086298 A CN106086298 A CN 106086298A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
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- 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
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- 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
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- 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
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- 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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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses the smelting process of a kind of low-phosphorous low titanium low-sulfur steel, described smelting process comprises the steps: 1) electric furnace smelting；2) LF refine；3) VD application of vacuum；4) P≤0.008%, Ti≤0.002%, S≤0.002% in gained molten steel is smelted.The present invention can obtain low-phosphorous low titanium low-sulfur molten steel, improves the smelting rhythm of electric furnace simultaneously, reduces the smelting cost such as electric furnace Calx, power consumption, avoid refine be desulfurization use change slag operation, ensure that the stable smooth operation of production, improve the cleanliness factor of molten steel, improve product quality.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, specifically the present invention relates to the smelting of a kind of low-phosphorous-low titanium-low-sulfur steel
Method.
Background technology
Along with structural adjustment and the product up-gradation of steel industry, steel enterprise is faced with the competitive pressure that is on the rise, wants existence,
Must make an effort in kind and quality, make great efforts to produce high added value, the product of high-tech content, low titanium bearing steel, wind-powered electricity generation are used
The high-quality such as steel, high added value steel have become one of staple product of iron and steel enterprise's research and development in the present age, and these steel grades are used
Continuous cast round billets specification big, higher to the purity requirements of steel, particularly phosphorus, titanium, sulfur requirement relatively low.Electric arc furnace refining at present
Steel, the raw material of use is mainly steel scrap and molten iron, and molten iron is without pretreatment dephosphorizing, desulfurization, particularly Low-phosphorus Steel, by ferrum
The restriction of water, material source and other conditions.Traditional electric furnace smelting low-phosphorous-low titanium-low-sulfur steel, goes titanium, desulfurization for reaching dephosphorization
Purpose, adds the slag materials such as substantial amounts of Calx, and smelting cost is high, electric furnace smelting time length (>=50min), and dephosphorization goes titanium difficulty,
Even sentencing useless because of molten steel phosphorus height, Ti content is unsatisfactory for requirement, has a strong impact on the fatigue life of product, and refine is that desulfurization goes out sometimes
Now changing slag operation, it is unstable that whole system generates rhythm, and constant product quality is poor.
Summary of the invention
The deficiency existed for tradition smelting process, it is an object of the invention to, it is provided that a kind of low-phosphorous-low titanium-low-sulfur steel
Smelting process, it is thus achieved that molten steel has extremely low phosphorus, titanium, sulfur content, and electric furnace puts that steel phosphorus can reach less than 0.004%, titanium reaches
Less than 0.0006%, P≤0.008%, Ti≤0.002%, S≤0.002% in finished product molten steel, this smelting process improves simultaneously
The smelting rhythm of electric furnace, reduce the smelting cost such as electric furnace Calx, power consumption, it is to avoid refine be desulfurization use change slag behaviour
Make, it is ensured that the stable smooth operation of production, improve the cleanliness factor of molten steel, improve product quality.
For achieving the above object, the present invention provides following technical scheme:
The smelting process of a kind of low-phosphorous-low titanium-low-sulfur steel, described smelting process comprises the steps:
1) electric furnace smelting: reasonably combined burden structure, controls tank side ferrum, the pig iron (remelted pig iron), ironcasting etc. phosphorous high
Fructus Anisi Stellati addition is not more than the 8% of total charge weight, blending process is accomplished lower densification, upper loose, middle high, surrounding is low, fire door
Mouth is without Fructus Anisi Stellati；Loading system uses (60-70) % molten iron+(30-40) % high-quality steel scrap；Electric furnace uses steel operation more than recrement, remaining
Steel, the quantity of slag control (15-25) % in tap；Calx 10-12/t steel, dolomite 6-7 is added at EAF bottom before smelting
/ t steel, adds Calx 10-12/t steel during power transmission 3-5 minute, add Calx angle for+3 degree, it is ensured that add Calx in smelting process
Shi Zhengchang oxygen blast and minimizing splash loss；Do not release slag too early, the slag of particularly fritting state, reach at molten steel temperature
When 1530 DEG C-1550 DEG C, increase foamed slag height and automatically flow slag operation, and in good time to the dynamic body of heater of inclination of slagging tap, after stream slag
Suitably add Calx 4-5/t steel；Molten steel temperature reaches 1560 DEG C-1580 DEG C, carries out changing slag operation, releases initial stage slag, then divides
Batch adds Calx, and every batch addition is 4-6/t steel, makes high alkalinity slag, and basicity of slag controls to 2.0-3.0；Terminal
Temperature is with no more than 1650 DEG C as principle；Using eccentric furnace bottom slag free tapping technology, time >=140 second of tapping, in tapping process
Slag once occurs, it is necessary to remove oxidizing slag in time, again make refining slag, then carry out refine；Electric furnace uses low titanium alloy to carry out
Alloying；Active lime 6-8kg/t steel, accelerator 2.0-3kg/t steel, steel-core-aluminium is added with steel stream when electric furnace steel tapping 1/3
2.0-3kg/t steel, dolomite 1.0-2.0kg/t steel；Electric furnace accesses BOTTOM ARGON BLOWING during putting steel, tapping early stage argon is (500-
800)NL×2/min；
2) LF refine: be transported to LF refining furnace after tapping, molten steel enters LF power transmission slag making, uses arc-covering slag operation, soft
Argon controls, and adding slag charge is 4-7kg/t steel, and including Calx, slag adjusting agent etc., slag charge overall control target is 13-17kg/t steel；
LF uses high alkalinity slag, and Composition Control is: CaO=45%-55%, Si02=8%-10%, A1203=25%-35%, MgO
=5%-10%；LF stove deoxidation mode uses early stage single to concentrate Quick-acting aluminium metallurgy deoxidation, add low silicon titanium-carbide and carbon dust in batches
Diffusive deoxidation combines, white slag retention time >=15min, and low silicon titanium-carbide feed postition is for repeatedly to add, and one time addition is
3-5, does not allow whole bag to add；LF uses low titanium alloy to carry out alloying；Calcification processing is carried out during LF refine tapping；
3) VD application of vacuum: LF refining furnace decides whether to carry out taking off slag operation, ladle according to ladle space after smelting
<800mm carries out taking off slag operation headroom, takes off the 1/5-1/3 that the quantity of slag is total quantity of slag, and molten steel is directly transported to VD by headroom>=800mm
Stove is smelted；Vacuum processing time is 25-30min, and argon flow amount controls at 10-70NL/min, takes finished product sample and analyze also after broken sky
Adding a certain amount of coverture in molten steel face, adjust argon and carry out soft blow argon after broken sky, during soft blow argon, argon flow amount controls at steel
Water liquid level fine motion, soft argon blowing time controls at 15-40min；
4) P≤0.008%, Ti≤0.002%, S≤0.002% in gained molten steel is smelted.
Main advantages of the present invention are:
1) the method electric furnace completes dephosphorization and goes the titanium time can shorten 10-15min, and lime consumption reduces 10-20kg/t steel, smelting
Refining power consumption reduces amplitude >=35kwh/t steel, and electric furnace puts that steel phosphorus can reach less than 0.004%, titanium reaches less than 0.0006%.
2) obtain in molten steel there is extremely low phosphorus, titanium, sulfur content, finished product molten steel P≤0.008%, Ti≤0.002%, S≤
0.002%.
3) avoid refine be desulfurization use change slag operation.Ensure that the stable smooth operation of production, improve molten steel
Cleanliness factor, improves product quality.
Detailed description of the invention
Below in conjunction with detailed description of the invention, it is further elucidated with the present invention.
Embodiment 1
Use this method to smelt wind power flange S355NL, said method comprising the steps of:
1) electric furnace smelting: total charge weight 125 tons, molten iron 80 tons, steel scrap 45 tons (tank side ferrum, the pig iron (remelted pig iron), ironcasting
Etc. phosphorous high Fructus Anisi Stellati addition 8 tons, roll useless 33 tons, crop 4 tons), blending process is accomplished lower densification, upper loose, middle high,
Surrounding is low, stove gate is without Fructus Anisi Stellati；Electric furnace uses steel operation more than recrement, and Yu Gang, the quantity of slag control at about 25 tons；At electric furnace before smelting
Furnace bottom adds 1.2 tons of Calx, dolomite 0.8 ton, adds 1.2 tons of Calx, add Calx angle in smelting process during power transmission 3-5 minute
For+3 degree, it is ensured that add normal oxygen blast and minimizing splash loss during Calx；Do not release slag too early, the stove of particularly fritting state
Slag, about power transmission 8min, power failure oxygen blast increases (FeO) in slag, when molten steel temperature reaches 1530 DEG C-1550 DEG C, increases bubble
Foam slag height flows slag operation automatically, and in good time to the dynamic body of heater of inclination of slagging tap, suitably adds Calx 500kg after stream slag；Molten steel
Temperature reaches 1560 DEG C-1580 DEG C, carries out changing slag operation, releases initial stage slag, then adds Calx in batches, and every batch addition is
500kg, makes high alkalinity slag, and basicity of slag controls to 2.0-3.0；Outlet temperature is with no more than 1650 DEG C as principle；Use partially
Heart furnace bottom slag free tapping technology, time >=140 second of tapping, tapping process once occurs slag, it is necessary to remove oxidizing slag in time,
Again make refining slag, then carry out refine；Electric furnace uses low titanium alloy to carry out alloying；Add with steel stream when electric furnace steel tapping 1/3
Active lime 800kg, accelerator 300kg, steel-core-aluminium 300kg, dolomite 125kg；Electric furnace accesses BOTTOM ARGON BLOWING during putting steel, goes out
Steel early stage argon is 500NL × 2/min；
2) LF refine: be transported to LF refining furnace after tapping, molten steel enters LF power transmission slag making, uses arc-covering slag operation, soft
Argon controls, and adds Calx 300, slag adjusting agent 200；LF uses high alkalinity slag, and Composition Control is: CaO=45%-
55%, Si02=8%-10%, A1203=25%-35%, MgO=5%-10%；LF stove deoxidation mode uses early stage single collection
Middle Quick-acting aluminium metallurgy deoxidation, add low silicon titanium-carbide and carbon dust diffusive deoxidation combines, white slag retention time >=15min in batches, low
Silicon titanium-carbide feed postition is for repeatedly to add, and an addition is 3-5, does not allow whole bag to add；LF uses low titanium alloy to enter
Row alloying；Calcification processing is carried out during LF refine tapping；
3) VD application of vacuum: LF refining furnace decides whether to carry out taking off slag operation, ladle according to ladle space after smelting
<800mm carries out taking off slag operation headroom, takes off the 1/5-1/3 that the quantity of slag is total quantity of slag, and molten steel is directly transported to VD by headroom>=800mm
Stove is smelted；Vacuum processing time is 25-30min, and argon flow amount controls at 10-70NL/min, stirs 20 seconds thermometrics, application of vacuum
27min, takes finished product sample and analyzes and add in molten steel face a certain amount of coverture, adjust argon and carry out soft blow after broken sky after broken sky
Argon, during soft blow argon, argon flow amount controls in liquid steel level fine motion, and soft argon blowing time controls at 15-40min；
4) smelting P≤0.008%, Ti≤0.002%, S≤0.002% in gained molten steel, product quality meets middle and high end
User's request.
Traditional handicraft contrasts with the application leading indicator:
| Leading indicator | Traditional handicraft | Use the method |
| Electric furnace smelting average period | 55min | 45min |
| Electric furnace lime consumption | 55kg/t steel | 40kg/t steel |
| Electric furnace smelting power consumption | 115kwh/t steel | 80kwh/t steel |
Embodiment 2
Use this method to smelt wind power flange S355NL, said method comprising the steps of:
1) electric furnace smelting: total charge weight 125 tons, molten iron 87 tons, steel scrap 38 tons (tank side ferrum, the pig iron (remelted pig iron), ironcasting
Etc. phosphorous high Fructus Anisi Stellati addition 9 tons, roll useless 24 tons, crop 5 tons), blending process is accomplished lower densification, upper loose, middle high,
Surrounding is low, stove gate is without Fructus Anisi Stellati；Electric furnace uses steel operation more than recrement, and Yu Gang, the quantity of slag control at about 31 tons；At electric furnace before smelting
Furnace bottom adds 1.5 tons of Calx, dolomite 0.875 ton, adds 1.5 tons of Calx, add Calx angle in smelting process during power transmission 3-5 minute
Degree is+3 degree, it is ensured that add normal oxygen blast and minimizing splash loss during Calx；Do not release slag too early, particularly fritting state
Slag, about power transmission 8min, power failure oxygen blast increases (FeO) in slag, when molten steel temperature reaches 1530 DEG C-1550 DEG C, increases
Foamed slag height flows slag operation automatically, and in good time to the dynamic body of heater of inclination of slagging tap, suitably adds Calx 625kg after stream slag；Steel
Liquid temp reaches 1560 DEG C-1580 DEG C, carries out changing slag operation, releases initial stage slag, then adds Calx in batches, every batch addition
For 750kg, making high alkalinity slag, basicity of slag controls to 2.0-3.0；Outlet temperature is with no more than 1650 DEG C as principle；Use
Eccentric furnace bottom slag free tapping technology, time >=140 second of tapping, tapping process once occurs slag, it is necessary to remove oxidation in time
Slag, again makes refining slag, then carries out refine；Electric furnace uses low titanium alloy to carry out alloying；Add with steel stream when electric furnace steel tapping 1/3
Enter active lime 1000kg, accelerator 375kg, steel-core-aluminium 375kg, dolomite 250kg；Electric furnace accesses bottom blowing during putting steel
Argon, tapping early stage argon is 800NL × 2/min；
2) LF refine: be transported to LF refining furnace after tapping, molten steel enters LF power transmission slag making, uses arc-covering slag operation, soft
Argon controls, and adds Calx 475, slag adjusting agent 400；LF uses high alkalinity slag, and Composition Control is: CaO=45%-
55%, Si02=8%-10%, A1203=25%-35%, MgO=5%-10%；LF stove deoxidation mode uses early stage single collection
Middle Quick-acting aluminium metallurgy deoxidation, add low silicon titanium-carbide and carbon dust diffusive deoxidation combines, white slag retention time >=15min in batches, low
Silicon titanium-carbide feed postition is for repeatedly to add, and an addition is 3-5, does not allow whole bag to add；LF uses low titanium alloy to enter
Row alloying；Calcification processing is carried out during LF refine tapping；
3) VD application of vacuum: LF refining furnace decides whether to carry out taking off slag operation, ladle according to ladle space after smelting
<800mm carries out taking off slag operation headroom, takes off the 1/5-1/3 that the quantity of slag is total quantity of slag, and molten steel is directly transported to VD by headroom>=800mm
Stove is smelted；Vacuum processing time is 25-30min, and argon flow amount controls at 10-70NL/min, stirs 20 seconds thermometrics, application of vacuum
27min, takes finished product sample and analyzes and add in molten steel face a certain amount of coverture, adjust argon and carry out soft blow after broken sky after broken sky
Argon, during soft blow argon, argon flow amount controls in liquid steel level fine motion, and soft argon blowing time controls at 15-40min；
4) smelting P≤0.008%, Ti≤0.002%, S≤0.002% in gained molten steel, product quality meets middle and high end
User's request.
Traditional handicraft contrasts with the application leading indicator:
| Leading indicator | Traditional handicraft | Use the method |
| Electric furnace smelting average period | 55min | 44min |
| Electric furnace lime consumption | 55kg/t steel | 43kg/t steel |
| Electric furnace smelting power consumption | 115kwh/t steel | 82kwh/t steel |
Certainly, the present invention can also have various embodiments, in the case of without departing substantially from present invention spirit and essence thereof, is familiar with
Those skilled in the art can make various corresponding change and modification according to disclosure of the invention, but these change accordingly and
Deformation all should belong to the protection domain of appended claims of the invention.
Claims (3)
1. a smelting process for low-phosphorous-low titanium-low-sulfur steel, described smelting process comprises the steps:
1) electric furnace smelting: load system and use 60-70% molten iron+30-40% steel scrap, control phosphorous high Fructus Anisi Stellati addition little
In total charge weight 8%；Electric furnace uses steel operation more than recrement, and Yu Gang, the quantity of slag control the 15-25% in tap；Smelt before
EAF bottom adds Calx 10-12/t steel, dolomite 6-7/t steel；Calx 10-12/t steel is added during power transmission 3-5 minute,
Smelting process adds Calx angle for+3 degree；When molten steel temperature reaches 1530 DEG C-1550 DEG C, increase foamed slag height and carry out certainly
Dynamic stream slag operation, and to the dynamic body of heater of inclination of slagging tap, after stream slag, add Calx 4-5/t steel；Molten steel temperature reaches 1560 DEG C-1580
DEG C, carrying out changing slag operation, release initial stage slag, then add Calx in batches, addition is 4-6/t steel, makes high alkalinity slag, stove
Basicity of slag controls to 2.0-3.0；Outlet temperature≤1650 DEG C；Use eccentric furnace bottom slag free tapping technology, time >=140 of tapping
Second；Electric furnace uses low titanium alloy to carry out alloying；Active lime 6-8kg/t steel, promotion is added with steel stream when electric furnace steel tapping 1/3
Agent 2.0-3kg/t steel, steel-core-aluminium 2.0-3kg/t steel, dolomite 1.0-2.0kg/t steel；Electric furnace accesses BOTTOM ARGON BLOWING during putting steel,
Tapping early stage argon is 500-800NL × 2/min；
2) LF refine: be transported to LF refining furnace after tapping, molten steel enters LF power transmission slag making, uses arc-covering slag operation, soft blow argon
Controlling, adding slag charge is 4-7kg/t steel, and slag charge overall control target is 13-17kg/t steel；LF uses high alkalinity slag, composition
Control is: CaO=45%-55%, Si02=8%-10%, A1203=25%-35%, MgO=5%-10%；LF stove deoxidation side
Formula uses early stage single to concentrate Quick-acting aluminium metallurgy deoxidation, add low silicon titanium-carbide and carbon dust diffusive deoxidation combines in batches, and white slag is protected
Holding the time >=15min, low silicon titanium-carbide feed postition is for repeatedly to add, and an addition is 3-5；LF uses low titanium alloy to enter
Row alloying；Calcification processing is carried out during LF refine tapping；
3) VD application of vacuum: LF refining furnace decides whether to carry out taking off slag operation according to ladle space after smelting, Steel ladle clearance <
800mm carries out taking off slag operation, takes off the 1/5-1/3 that the quantity of slag is total quantity of slag, and molten steel is directly transported to VD stove smelting by headroom >=800mm
Refining；Vacuum processing time is 25-30min, and argon flow amount controls at 10-70NL/min, takes finished product sample and analyze and at steel after broken sky
Liquid level adds coverture, adjusts argon and carry out soft blow argon after broken sky, and during soft blow argon, argon flow amount controls in liquid steel level fine motion
Can, soft argon blowing time controls at 15-40min；
4) P≤0.008%, Ti≤0.002%, S≤0.002% in gained molten steel is smelted.
The smelting process of a kind of low-phosphorous-low titanium-low-sulfur steel the most as claimed in claim 1, it is characterised in that: phosphorous high Fructus Anisi Stellati
Including tank side ferrum, the pig iron or remelted pig iron, ironcasting.
The smelting process of a kind of low-phosphorous-low titanium-low-sulfur steel the most as claimed in claim 1, it is characterised in that: step 2) in, institute
State slag charge and include Calx, slag adjusting agent.
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| CN109252438A (en) * | 2018-10-10 | 2019-01-22 | 中建八局第三建设有限公司 | A kind of technique using refining furnace white slag stabilization processes cement stabilization layer |
| CN109628820A (en) * | 2019-01-10 | 2019-04-16 | 石钢京诚装备技术有限公司 | A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method |
| CN109628694A (en) * | 2018-12-29 | 2019-04-16 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
| CN111663019A (en) * | 2020-05-18 | 2020-09-15 | 包头钢铁（集团）有限责任公司 | Special refining slag for producing bearing steel by medium-sized converter and bearing steel production process thereof |
| CN114657303A (en) * | 2022-05-24 | 2022-06-24 | 山西建龙实业有限公司 | Method for synergistically utilizing high-iron red mud and scrap steel |
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| CN109252438A (en) * | 2018-10-10 | 2019-01-22 | 中建八局第三建设有限公司 | A kind of technique using refining furnace white slag stabilization processes cement stabilization layer |
| CN109628694A (en) * | 2018-12-29 | 2019-04-16 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
| CN109628820A (en) * | 2019-01-10 | 2019-04-16 | 石钢京诚装备技术有限公司 | A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method |
| CN111663019A (en) * | 2020-05-18 | 2020-09-15 | 包头钢铁（集团）有限责任公司 | Special refining slag for producing bearing steel by medium-sized converter and bearing steel production process thereof |
| CN114657303A (en) * | 2022-05-24 | 2022-06-24 | 山西建龙实业有限公司 | Method for synergistically utilizing high-iron red mud and scrap steel |
| CN115786634A (en) * | 2022-12-06 | 2023-03-14 | 舞阳钢铁有限责任公司 | Method for improving welding performance of nickel-containing low-temperature steel |
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