CN107365884A - A kind of method of ultra-low-carbon steel carbon component close limit control - Google Patents
A kind of method of ultra-low-carbon steel carbon component close limit control Download PDFInfo
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- CN107365884A CN107365884A CN201610312982.7A CN201610312982A CN107365884A CN 107365884 A CN107365884 A CN 107365884A CN 201610312982 A CN201610312982 A CN 201610312982A CN 107365884 A CN107365884 A CN 107365884A
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- steel
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Classifications
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C7/068—Decarburising
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of method of ultra-low-carbon steel carbon component close limit control, including：1) molten iron pre-processes：During Sulfur Content in Hot Iron content≤0.003wt%, converter smelting is transferred to；2) converter smelting：Carbon content≤0.06wt%, oxygen content 0.05wt%~0.09wt% in molten steel, and tapped in converter during 1680~1720 DEG C of liquid steel temperature into ladle；3) RH vacuum refinings：Control decarburization terminate before steel oxygen content in water be 0.02wt%~0.05wt%, carbon content≤0.0020wt% in steel；4) continuous casting：In basket pouring, tundish adds carbon-free covering agent and carries out molding casting.The present invention reduces the molten steel recarburization amount after refining terminates by the alloy carburetting stable by phosphorus content in the carbon removal in molten steel to fixed range, is reused；The fluctuation range of ultra-low-carbon steel carbon content is controlled 20 × 10‑6Within, be advantageous to improve steel rolling efficiency and finished product steel quality.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of method of ultra-low-carbon steel carbon component close limit control.
Background technology
Ultra-low-carbon steel is often referred to the steel that carbon content is less than 0.01%, and it is IF steel that it, which typically represents steel grade,.Ultra-low-carbon steel performance
Excellent, widely used, it has advantages below：1) excellent deep drawability and electromagnetic performance；2) without ageing；3)
Fabulous processing forming；4) Large strain power.
By strengthening the process control needs to steel making working procedure, the control accuracy of carbon content in steel is improved, ultra-low-carbon steel can be produced
Quality horizontal stable, so as to improve cold rolling speed, increase production capacity, improve production efficiency.
The carbon content of most of ultra-low-carbon steel is more low better, and the carbon content of ultra-low-carbon steel is generally below 50 × 10-6, needed for some
Carbon content fluctuation range is 20 × 10 in control steel-6Within ultra-low-carbon steel, stability contorting carbon content technical difficulty is larger.It is raw
Producing such ultra-low-carbon steel is needed to carry out close limit control to carbon component, and its flow is generally：Converter boiling tapping, enter RH decarburizations,
Take molten steel sample, the chemical examination composition according to steel sample, adjustment carbon content.The shortcomings that existing process be carbon content after decarburization terminates not
It is stable, vacuumize added under state a small amount of carburant carburetting effect it is unstable, technique controlling difficulty is high, and product quality is unstable
It is fixed.
The content of the invention
The invention provides a kind of method of ultra-low-carbon steel carbon component close limit control, by changing process for making, by Ultra-low carbon
The fluctuation range of steel carbon content is controlled 20 × 10-6Within, control accuracy is substantially improved, be advantageous to improve steel rolling efficiency and into
Product steel quality.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of method of ultra-low-carbon steel carbon component close limit control, by the carbon removal in molten steel to fixed range, reuses and contains
The stable alloy carburetting of carbon amounts, reduce the molten steel recarburization amount after refining terminates；Concrete technology flow process is as follows：
1) molten iron pre-processes：Using pretreatment unit into molten iron blowing desulfurization pulvis, and it is clean to skim, and works as Sulfur Content in Hot Iron
Molten iron is transferred to converter smelting during content≤0.003wt%；
2) converter smelting：Oxygen blast carbon drop is carried out in converter by molten iron smelting into molten steel, oxygen blow duration is 15~18 minutes；
Slag making materials is added in converter steelmaking process into molten steel, when carbon content≤0.06wt%, oxygen content reach 0.05 in molten steel
Wt%~0.09wt%, and tapping in ladle, uses in tapping process when liquid steel temperature reaches 1680~1720 DEG C in converter
Slag Retaining Process, argon station add 2~5kg/t limes；
3) RH vacuum refinings：Using RH vacuum cycle device decarburizations, it is 0.02 to control decarburization to terminate preceding steel oxygen content in water
Wt%~0.05wt%, carbon content≤0.0020wt% in steel；Calm molten steel, carburetting alloy is added, makes various chemistry in molten steel
Component content and temperature reach target molten steel requirement；Processing stands 15~25 minutes after terminating, and molten steel is transferred into continuous casting program；
4) continuous casting：In basket pouring, tundish adds carbon-free covering agent and carries out molding casting.
Compared with prior art, the beneficial effects of the invention are as follows：
By changing process for making, the fluctuation range of ultra-low-carbon steel carbon content is controlled 20 × 10-6Within, control accuracy is big
Width is lifted, and is advantageous to improve steel rolling efficiency and finished product steel quality.
Embodiment
A kind of method of present invention ultra-low-carbon steel carbon component close limit control, by the carbon removal in molten steel to fixed range, then
Using the alloy carburetting that phosphorus content is stable, the molten steel recarburization amount after refining terminates is reduced；Concrete technology flow process is as follows：
1) molten iron pre-processes：Using pretreatment unit into molten iron blowing desulfurization pulvis, and it is clean to skim, and works as Sulfur Content in Hot Iron
Molten iron is transferred to converter smelting during content≤0.003wt%；
2) converter smelting：Oxygen blast carbon drop is carried out in converter by molten iron smelting into molten steel, oxygen blow duration is 15~18 minutes；
Slag making materials is added in converter steelmaking process into molten steel, when carbon content≤0.06wt%, oxygen content reach 0.05 in molten steel
Wt%~0.09wt%, and tapping in ladle, uses in tapping process when liquid steel temperature reaches 1680~1720 DEG C in converter
Slag Retaining Process, argon station add 2~5kg/t limes；
3) RH vacuum refinings：Using RH vacuum cycle device decarburizations, it is 0.02 to control decarburization to terminate preceding steel oxygen content in water
Wt%~0.05wt%, carbon content≤0.0020wt% in steel；Calm molten steel, carburetting alloy is added, makes various chemistry in molten steel
Component content and temperature reach target molten steel requirement；Processing stands 15~25 minutes after terminating, and molten steel is transferred into continuous casting program；
4) continuous casting：In basket pouring, tundish adds carbon-free covering agent and carries out molding casting.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.Method therefor such as nothing is especially said in following embodiments
Bright is conventional method.
【Embodiment 1】
Molten iron pre-processes：Magnesium-based desulfurization powder is blown into molten iron using desulfuring spray gun, CaO/Mg mass ratioes are 4：1, when
Converter smelting is transferred to during Sulfur Content in Hot Iron content≤0.003wt%；
Converter smelting：Molten iron after desulfurization is blended into converter, oxygen blow duration is 18 minutes, to it in converter steelmaking process
Interior addition slag making materials, when to turn in molten steel in the stove carbon content be 0.04wt%, oxygen content reaches 0.06wt%, and steel in converter
Coolant-temperature gage is tapped into ladle when reaching 1690 DEG C, and Slag Retaining Process is used in tapping process；Argon station adds 3kg/t limes；
RH vacuum refinings：Start RH vacuum cycle devices decarburization 20 minutes, control decarburization to terminate preceding steel oxygen content in water to be
0.03wt%, carbon content≤0.0020wt% in steel, add that aluminum steel section is calm, and aluminium alloying adds high carbon ferromanganese and closed after 5 minutes
Golden carburetting, while the alloy for adjusting other compositions is added, net circulation closes RH vacuum cycle devices after 8 minutes.
High carbon ferromanganese alloy carbon content control is in 6wt%~8wt%, and addition is according to aim carbon cubage, in the present embodiment,
Molten steel target carbon content is 0.0040wt%, and molten steel amount is 260t, adds high carbon ferromanganese 100kg.It is quiet before the cast of upper machine
Put 25 minutes, field trash is fully floated.
Continuous casting：Add 3kg/t carbon-free covering agents and carry out molding casting.
Through examining, the carbon content in finished steel is 0.0036wt%.
【Embodiment 2】
Molten iron pre-processes：Magnesium-based desulfurization powder is blown into molten iron using desulfuring spray gun, CaO/Mg mass ratioes are 4：1, when
Converter smelting is transferred to during Sulfur Content in Hot Iron content≤0.003wt%；
Converter smelting：Molten iron after desulfurization is blended into converter, oxygen blow duration is 15 minutes, to it in converter steelmaking process
Interior addition slag making materials, when to turn in molten steel in the stove carbon content be 0.05wt%, oxygen content reaches 0.09wt%, and steel in converter
Coolant-temperature gage is tapped into ladle when reaching 1720 DEG C, and Slag Retaining Process is used in tapping process；Argon station adds 2kg/t limes；
RH vacuum refinings：Start RH vacuum cycle devices decarburization 15 minutes, control decarburization to terminate preceding steel oxygen content in water to be
0.05wt%, carbon content≤0.0020wt% in steel, add that aluminum steel section is calm, and aluminium alloying adds high carbon ferromanganese after 3 minutes
Alloy carburetting, while the alloy for adjusting other compositions is added, net circulation closes RH vacuum cycle devices after 5 minutes.
High carbon ferromanganese alloy carbon content control is in 6wt%~8wt%, and addition is according to aim carbon cubage, in the present embodiment,
Molten steel target carbon content is 0.0040wt%, and molten steel amount is 260t, adds high carbon ferromanganese 100kg.It is quiet before the cast of upper machine
Put 15 minutes, field trash is fully floated.
Continuous casting：Add 2kg/t carbon-free covering agents and carry out molding casting.
Through examining, the carbon content in finished steel is 0.0038wt%.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, appoint
What those familiar with the art the invention discloses technical scope in, technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (1)
- A kind of 1. method of ultra-low-carbon steel carbon component close limit control, it is characterised in that by the carbon removal in molten steel to fixation In the range of, the stable alloy carburetting of phosphorus content is reused, reduces the molten steel recarburization amount after refining terminates；Concrete technology flow process is such as Under：1) molten iron pre-processes：Using pretreatment unit into molten iron blowing desulfurization pulvis, and it is clean to skim, and works as Sulfur Content in Hot Iron Molten iron is transferred to converter smelting during content≤0.003wt%；2) converter smelting：Oxygen blast carbon drop is carried out in converter by molten iron smelting into molten steel, oxygen blow duration is 15~18 minutes； Slag making materials is added in converter steelmaking process into molten steel, when carbon content≤0.06wt%, oxygen content reach 0.05 in molten steel Wt%~0.09wt%, and tapping in ladle, uses in tapping process when liquid steel temperature reaches 1680~1720 DEG C in converter Slag Retaining Process, argon station add 2~5kg/t limes；3) RH vacuum refinings：Using RH vacuum cycle device decarburizations, it is 0.02 to control decarburization to terminate preceding steel oxygen content in water Wt%~0.05wt%, carbon content≤0.0020wt% in steel；Calm molten steel, carburetting alloy is added, makes various chemistry in molten steel Component content and temperature reach target molten steel requirement；Processing stands 15~25 minutes after terminating, and molten steel is transferred into continuous casting program；4) continuous casting：In basket pouring, tundish adds carbon-free covering agent and carries out molding casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312982.7A CN107365884A (en) | 2016-05-12 | 2016-05-12 | A kind of method of ultra-low-carbon steel carbon component close limit control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312982.7A CN107365884A (en) | 2016-05-12 | 2016-05-12 | A kind of method of ultra-low-carbon steel carbon component close limit control |
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| CN107365884A true CN107365884A (en) | 2017-11-21 |
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| CN201610312982.7A Pending CN107365884A (en) | 2016-05-12 | 2016-05-12 | A kind of method of ultra-low-carbon steel carbon component close limit control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109957634A (en) * | 2019-02-28 | 2019-07-02 | 邯郸钢铁集团有限责任公司 | A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon |
| CN110846470A (en) * | 2019-12-03 | 2020-02-28 | 本钢板材股份有限公司 | Method for accurately controlling carbon content in RH refined low-carbon steel |
| CN112961958A (en) * | 2021-02-24 | 2021-06-15 | 首钢京唐钢铁联合有限责任公司 | Production method of sulfur-containing ultrahigh-oxygen ultralow-carbon steel |
| CN116064997A (en) * | 2022-12-28 | 2023-05-05 | 天铁热轧板有限公司 | Method for producing low-carbon steel by RH vacuum refining |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483501A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Method for smelting phosphorus-containing ultra-low carbon steel |
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2016
- 2016-05-12 CN CN201610312982.7A patent/CN107365884A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105483501A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Method for smelting phosphorus-containing ultra-low carbon steel |
Non-Patent Citations (1)
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| 甘绍君等: "涟钢-炼轧厂超低碳钢的生产优化实践", 《企业技术开发》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109957634A (en) * | 2019-02-28 | 2019-07-02 | 邯郸钢铁集团有限责任公司 | A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon |
| CN110846470A (en) * | 2019-12-03 | 2020-02-28 | 本钢板材股份有限公司 | Method for accurately controlling carbon content in RH refined low-carbon steel |
| CN112961958A (en) * | 2021-02-24 | 2021-06-15 | 首钢京唐钢铁联合有限责任公司 | Production method of sulfur-containing ultrahigh-oxygen ultralow-carbon steel |
| CN116064997A (en) * | 2022-12-28 | 2023-05-05 | 天铁热轧板有限公司 | Method for producing low-carbon steel by RH vacuum refining |
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Application publication date: 20171121 |