CN108384920A - A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process - Google Patents
A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process Download PDFInfo
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- CN108384920A CN108384920A CN201810177364.5A CN201810177364A CN108384920A CN 108384920 A CN108384920 A CN 108384920A CN 201810177364 A CN201810177364 A CN 201810177364A CN 108384920 A CN108384920 A CN 108384920A
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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
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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
- B22D11/16—Controlling or regulating processes or operations
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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
- C21C5/28—Manufacture of steel in the converter
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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
- C21C7/064—Dephosphorising; Desulfurising
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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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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process, belongs to steelmaking technical field.Step and state modulator are：Converter is smelted using double slag process, and catch carbon temperature controls 1,600 1620 DEG C, and the phosphorus content of terminal is controlled in≤0.008wt%；[S]≤0.0050wt% after molten iron pretreatment in molten iron；LF stove refining controlling slag beneficiation FeO+MnO=1.0 1.5wt%, 8 12kg/t steel of clinker addition；It is produced using slab slab, maximum gauge specification is 400mm；The casting process degree of superheat is controlled at 15 25 DEG C.The advantage is that providing a kind of production method of 5 12wt% high-alloy billets of alloy amount, the control of finished product phosphorus content is controlled in≤0.015wt%, sulfur content in≤0.0025wt%, and the maximum alloy content of high-alloy steel can reach 12wt%.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of low-phosphorous low-sulfur high alloy heavy slab smelting process.Especially
It is related to a kind of smelting process using the low-phosphorous low-sulfur high alloy class heavy slab of " converter+LF stoves " technique productions, wherein alloy contains
Amount control is in 5%-12%.
Background technology
It is domestic at present mainly to be produced in Special Steel Works for the high-alloy steel of alloy content >=5%, production technology
Mainly electric furnace or converter smelting are equipped with after intermediate frequency furnace carries out alloy melting and are blended into molten steel in progress high-alloy steel life
Production, the method can produce the higher steel alloy of alloy content, the disadvantage is that needing special equipment, investment is big, and is only suitable for spy
Steel produces, and is not equipped with heavy slab；In addition there are a part of iron and steel enterprises using the conjunction of electric furnace or converter progress high-alloy steel
Aurification, the scaling loss using alloy when electric furnace progress alloying is serious, and the carburetting problem come along with electrode band is serious, using converter
When carrying out alloying, since Converter Oxigen Blowing causes alloy blow loss serious, the recovery rate of alloy is low.
Application No. is 200810079601.0 Chinese patents to disclose a kind of smelting process of high-alloy steel, application No. is
200710052539.1 Chinese patents disclose a kind of mixing method of high quality low phosphor and sulfur high-alloy steel, the two patents are all
High-alloy steel is produced for special steel plant, production technology is all：Using electric furnace or converter smelting crude molten steel, while using intermediate frequency
Induction furnace carry out melted alloy, alloy melting finishes, and after temperature reaches requirement, alloy molten steel is poured into molten steel, later into
Row refining, and it is equipped with molding production, the high alloy steel ingot of alloy content >=5% can be produced using this method, can meet special steel
Production requirement needs special alloy melting furnace apparatus, and when melted alloy and molten steel are converted the disadvantage is that generalization is poor,
Since the amount of being blended into variation causes alloying component control difficulty big greatly, often causes alloying component exceeded and occur smelting waste product.
Application No. is 201410318818.8 Chinese patents to disclose a kind of smelting for the high-alloy steel that Mn contents are 8.0%
The smelting process of smelting method, this method is converter+intermediate frequency furnace production, and using converter smelting molten steel, intermediate frequency furnace carries out alloy melting,
Then it is blended into molten steel and is carrying out refining and continuous casting, use this method that can produce Mn contents as 8.0% high-alloy steel, but
It is this method is carried out in special steel plant, and is equipped with special intermediate frequency furnace apparatus, therefore can not be promoted in straight carbon steel factory.
It discloses alloying in a kind of converter application No. is 201610113192.6 Chinese patents and produces low-phosphorous high-alloy steel
Smelting process, this method is smelted by converter duplex, and first time converter smelting coordinates slagging-off equipment to carry out low-phosphorous production, is turned
Second of smelting of stove carries out alloy melting, can produce P≤0.020% using the technique, Cr >=6% or the high of Mn >=6% are closed
The shortcomings that Jin Gang, the method is need to use special converter duplex technique that could realize, and alloy when alloying in converter
Scaling loss it is serious, recovery rate is low.
For the above reason, this patent proposes low-phosphorous low-sulfur high alloy heavy slab smelting process, realizes alloy content
The high alloy heavy slab steady production of 5%-12%, meets the demand of industrialization, batch production, is not found and the work through retrieval
The relevant patent of skill.
Invention content
The object of the present invention is to provide a kind of low-phosphorous low-sulfur high alloy heavy slab smelting processes, solve high alloy content thickness
The technical issues of slab produces.
A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process, process route are：Desulfurizing iron pretreatment-converter smelting
It refines-goes out steel alloying-LF stoves refining and alloying-RH vacuum refinings-slab CC machine, specific steps and parameter are as follows：
1, phosphorus content controls：Converter is smelted using double slag process, and catch carbon temperature controls 1600-1620 DEG C, the phosphorus of converter terminal
Content is controlled in≤0.008wt%；Follow-up alloying phosphorization amount control is in≤0.007wt%；The finished product phosphorus content of steel grade controls
In≤0.015wt%.
2, sulfur content controls：[S]≤0.0050wt% after molten iron pretreatment in molten iron；Converter smelting is using steel scrap and auxiliary
Material, control steel scrap sulfur content≤0.0050wt%；Sulfur content [S]≤0.010wt% of converter terminal；LF stove refining controlling clinkers
Oxidisability FeO+MnO=1.0-1.5wt%, basicity of slag CaO/SiO2=5.0~8.0, clinker addition 8-12kg/t steel, essence
Refining terminates sulfur content≤0.0025wt% in steel.
3, alloying controls：Using converter tapping process is partially-alloyed and LF stove refined alloys, the conjunction of tapping process
Gold amount is up to 60kg/t steel, and the alloy amount of LF stove refining process is up to 80kg/t steel, and LF stove heating-up time maximums reach
To 55min；The carbon increasing amount of LF stove refining process is up to 0.04wt%.
4, continuous casting billet quality controls：It is produced using slab slab, maximum gauge specification is 400mm；The casting process degree of superheat
Control is at 15-25 DEG C, using whole dynamic soft-reduction technique.
By controlling the technological parameter of links in smelting process, make the phosphorus content control of low-phosphorous low-sulfur high alloy heavy slab
System is controlled in≤0.0025wt%, alloy content in 5-12wt%, high alloy heavy slab in≤0.015wt%, sulfur content control
Internal soundness is excellent, meets high-alloy steel heavy slab production requirement.
The advantage of the invention is that：A kind of producer of alloy amount 5-12wt% high-alloy billets is provided for straight carbon steel factory
Method realizes that low-phosphorous low-sulfur high alloy heavy slab is smelted using this technique, the control of high-alloy steel finished product phosphorus content≤
0.015wt%, finished product sulfur content are controlled in≤0.0025wt%, and the maximum alloy content of high-alloy steel can reach 12wt%；
The method smelts high-alloy steel without increasing special smelting equipment, small investment, using tapping and LF stove alloyage process alloys
Recovery rate it is high, which can realize the stabilization of alloy amount 5-12wt% high-alloy steel heavy slabs, mass production.
Specific implementation mode
Embodiment 1
Steel grade high alloy die steel 738H, the process route used for：Desulfurizing iron pretreatment-converter smelting-tapping
Alloying-LF stoves refining and alloying-RH vacuum refinings-slab CC machine, specific steps and parameter is as follows, involved
Ingredient is mass percent：
(1) phosphorus content controls：Converter is smelted using double slag process, and catch carbon temperature controls 1620 DEG C, the phosphorus content of converter terminal
Control is 0.0080%；Follow-up alloying phosphorization amount control is 0.005%；The finished product phosphorus content of steel grade is controlled 0.013%.
(2) sulfur content controls：[S]=0.0050% after molten iron pretreatment in molten iron；Converter smelting uses high-quality steel scrap
And auxiliary material, control steel scrap sulfur content 0.0050%；The sulfur content [S]=0.010% of converter terminal；LF stove refining controlling clinker oxygen
The property changed (FeO+MnO)=1.0%, basicity of slag (CaO)/(SiO2)=7.0, clinker addition 9kg/t steel, refining terminate in steel
Sulfur content 0.0016%.
(3) alloying controls：Using converter tapping process is partially-alloyed and LF stove refined alloys, the conjunction of tapping process
Gold amount maximum can reach 50kg/t steel, and the alloy amount maximum of LF stove refining process can reach 40kg/t steel, and the LF stove heating-up times are most
Reach 38min greatly；The carbon increasing amount of LF stove refining process is up to 0.024%.
(4) continuous casting billet quality controls：It is produced using slab slab, thickness specification 400mm；The casting process degree of superheat controls
At 16 DEG C, using whole dynamic soft-reduction technique.
Using the 400mm thickness high alloy die steel 738H of this technique productions, alloy total amount reaches 5.2%, and finished product phosphorus contains
Amount control is 0.013%, and finished product sulfur content is controlled 0.0016%, and continuous casting billet internal soundness is good.
Embodiment 2
Steel grade high alloy medium managese steel, the process route used for：Desulfurizing iron pretreatment-converter smelting-goes out steel alloy
Change-LF stoves refining and alloying-RH vacuum refinings-slab CC machine, specific steps and parameter is as follows, involved ingredient
For mass percent：
(1) phosphorus content controls：Converter is smelted using double slag process, and catch carbon temperature controls 1600 DEG C, the phosphorus content of converter terminal
Control is 0.0070%；Follow-up alloying phosphorization amount control is 0.0075%；The finished product phosphorus content of steel grade is controlled 0.0145%.
(2) sulfur content controls：[S]=0.0040% after molten iron pretreatment in molten iron；Converter smelting uses high-quality steel scrap
And auxiliary material, control steel scrap sulfur content 0.0050%；The sulfur content [S]=0.0090% of converter terminal；LF stove refining controlling clinkers
Oxidisability (FeO+MnO)=1.2%, basicity of slag (CaO)/(SiO2)=5.0, clinker addition 12kg/t steel, refining terminate
Sulfur content 0.0024% in steel.
(3) alloying controls：Using converter tapping process is partially-alloyed and LF stove refined alloys, the conjunction of tapping process
Gold amount maximum can reach 55kg/t steel, and the alloy amount maximum of LF stove refining process can reach 80kg/t steel, and the LF stove heating-up times are most
Reach 56min greatly；The carbon increasing amount of LF stove refining process is up to 0.040%.
(4) continuous casting billet quality controls：It is produced using slab slab, thickness specification 400mm；The casting process degree of superheat controls
At 25 DEG C, using whole dynamic soft-reduction technique.
Using the 400mm thickness high alloy medium managese steel of this technique productions, alloy total amount reaches 12.0%, finished product phosphorus content control
System is 0.0145%, and finished product sulfur content is controlled 0.0024%, and continuous casting billet internal soundness is good.
Claims (2)
1. a kind of low-phosphorous low-sulfur high alloy heavy slab smelting process, process route are：Desulfurizing iron pretreatment-converter smelting-
Go out steel alloying-LF stoves refining and alloying-RH vacuum refinings-slab CC machine, which is characterized in that specific steps and ginseng
Number is as follows：
1) phosphorus content controls：Converter is smelted using double slag process, and catch carbon temperature controls 1600-1620 DEG C, the phosphorus content of converter terminal
Control is in≤0.008wt%；Follow-up alloying phosphorization amount control is in≤0.007wt%；Steel grade finished product phosphorus content control≤
0.015wt%；
2) sulfur content controls：[S]≤0.0050wt% after molten iron pretreatment in molten iron；Converter smelting uses steel scrap and auxiliary material,
Control steel scrap sulfur content≤0.0050wt%；Sulfur content [S]≤0.010wt% of converter terminal；LF stove refining controlling clinker oxygen
The property changed FeO+MnO=1.0-1.5wt%, basicity of slag CaO/SiO2=5.0~8.0, clinker addition 8-12kg/t steel, refining
Terminate sulfur content≤0.0025wt% in steel；
3) alloying controls：Using converter tapping process is partially-alloyed and LF stove refined alloys, the alloy amount of tapping process
The alloy amount of up to 60kg/t steel, LF stove refining process is up to 80kg/t steel, and the LF stove heating-up times are up to
55min；The carbon increasing amount of LF stove refining process is up to 0.04wt%；
4) continuous casting billet quality controls：It is produced using slab slab, maximum gauge specification is 400mm；The casting process degree of superheat controls
At 15-25 DEG C, using whole dynamic soft-reduction technique.
2. technique according to claim 1, which is characterized in that by controlling the parameter of links in smelting process, make
The phosphorus content control of low-phosphorous low-sulfur high alloy heavy slab is in≤0.015wt%, and sulfur content is controlled in≤0.0025wt%, and alloy contains
In 5-12wt%, high alloy heavy slab internal soundness meets high-alloy steel heavy slab production requirement for amount control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810177364.5A CN108384920A (en) | 2018-03-03 | 2018-03-03 | A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process |
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| CN201810177364.5A CN108384920A (en) | 2018-03-03 | 2018-03-03 | A kind of low-phosphorous low-sulfur high alloy heavy slab smelting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505678A (en) * | 2022-09-26 | 2022-12-23 | 首钢集团有限公司 | Smelting method of high alloy steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10140227A (en) * | 1996-11-05 | 1998-05-26 | Nkk Corp | Production of high alloy steel by joining two molten steels |
| CN103451536A (en) * | 2013-09-30 | 2013-12-18 | 济钢集团有限公司 | Low-cost thick subsea pipeline steel plate and manufacturing method of low-cost thick subsea pipeline steel plate |
| CN103540833A (en) * | 2013-09-30 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel |
| CN104498663A (en) * | 2014-12-27 | 2015-04-08 | 首钢总公司 | Smelting process of hydrogen-induced cracking resistant vessel steel |
| CN105420440A (en) * | 2014-09-19 | 2016-03-23 | 鞍钢股份有限公司 | Alloy adding method for medium-manganese or high-manganese alloy steel in smelting with converters |
-
2018
- 2018-03-03 CN CN201810177364.5A patent/CN108384920A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10140227A (en) * | 1996-11-05 | 1998-05-26 | Nkk Corp | Production of high alloy steel by joining two molten steels |
| CN103451536A (en) * | 2013-09-30 | 2013-12-18 | 济钢集团有限公司 | Low-cost thick subsea pipeline steel plate and manufacturing method of low-cost thick subsea pipeline steel plate |
| CN103540833A (en) * | 2013-09-30 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel |
| CN105420440A (en) * | 2014-09-19 | 2016-03-23 | 鞍钢股份有限公司 | Alloy adding method for medium-manganese or high-manganese alloy steel in smelting with converters |
| CN104498663A (en) * | 2014-12-27 | 2015-04-08 | 首钢总公司 | Smelting process of hydrogen-induced cracking resistant vessel steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505678A (en) * | 2022-09-26 | 2022-12-23 | 首钢集团有限公司 | Smelting method of high alloy steel |
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