CN110423952A - A kind of production method of the low B high purity steel of low S - Google Patents

A kind of production method of the low B high purity steel of low S Download PDF

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Publication number
CN110423952A
CN110423952A CN201910821772.4A CN201910821772A CN110423952A CN 110423952 A CN110423952 A CN 110423952A CN 201910821772 A CN201910821772 A CN 201910821772A CN 110423952 A CN110423952 A CN 110423952A
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CN
China
Prior art keywords
steel
slag
furnace
low
aluminum shot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910821772.4A
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Chinese (zh)
Inventor
张勇伟
李建宇
汤伟
罗登
蒋凌峰
杨勇
曾凡政
巨银军
房建民
左建林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
Original Assignee
Hunan Hualing Xiangtan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Hualing Xiangtan Iron and Steel Co Ltd filed Critical Hunan Hualing Xiangtan Iron and Steel Co Ltd
Priority to CN201910821772.4A priority Critical patent/CN110423952A/en
Publication of CN110423952A publication Critical patent/CN110423952A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

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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)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of production methods of the clean steel of the low B of low S.The additional amount and liquid steel temperature for bessemerizing slag charge early period are controlled, obtain that basicity is higher, the preferable converter slag of mobility, stronger Bottom Argon Stirring is used simultaneously, control lower final sulfur content and boron content, manganese metal is added according to steel grade, sprinkles a certain amount of aluminum shot on steel slag surface after tapping；LF furnace initial smelting period does not use aluminum shot to carry out slag making deoxidation, using hot refining wash heat is recycled, controls the additional amount of lime and synthetic slag, and the later period is suitably added aluminum shot according to sulfur content in steel and carries out desulfurization rapidly, guarantees outbound sulfur content no more than 15ppm；VD furnace fidelity sky is pressed to be controlled greater than 15min, properly increases inlet temperature into VD furnace, feeds calcium line after broken sky, and the soft blow time must be greater than 12min after broken sky.High cleanliness steel of the S no more than 0.002% and B no more than 0.0005% can be obtained using process above.

Description

A kind of production method of the low B high purity steel of low S
Technical field
The present invention relates to field of iron and steel smelting, and in particular to a kind of production method of the low B high purity steel of low S.
Background technique
Element sulphur easily forms field trash in steel, therefore is all used as harmful element as far as possible in other steel in addition to automatic steel Removal.Boron element has positive effect to play an important role low-temperature transformation steel to harden ability is improved, but has temper brittleness simultaneously, institute To be also the element for limiting its content in many steel grades as far as possible.With the development of steel and iron industry and the update of steel products, The steel such as offshore platform steel, bridge steel plate, antiacid pipeline and Vessel Steels of a new generation all have low S content to smelting in ingredient With the requirement of low B content.
Since B element is oxidizable element, B content is substantially in 2ppm hereinafter, subsequent to guarantee after Converter Oxigen Blowing is smelted Reduce the also commercial weight of B in deep sweetening process as far as possible, the main alloy using fine fodder method, that is, all, auxiliary material are all using being free of B Raw material.
Summary of the invention
The purpose of the present invention is to provide a kind of production methods of the low B high purity steel of low S, are combined using converter+LF+VD Production, sulfur content S≤0.002% and boron content B≤0.0005%.
The technical solution of invention:
A kind of production method of the low B high purity steel of low S, the chemical composition mass percentage of steel be C=0.05~0.10, Mn= 1.20~1.60, Si=0.20~0.50, P≤0.010, S≤0.002, B≤0.0005, Nb=0.40~0.50, Alt=0.020 ~0.050%, other are Fe and residual elements；It comprises the following steps that:
A. converter smelting: the additional amount and liquid steel temperature of slag charge early period are bessemerized in control, obtain basicity is higher, mobility compared with Good converter slag, while stronger Bottom Argon Stirring is used, terminal S≤50ppm, B≤2ppm are controlled, in steel slag table after tapping Face sprinkles aluminum shot to avoid tapping process slag；
B. LF refining: LF furnace initial smelting period is forbidden carrying out slag making deoxidation with aluminum shot, carries out wash heat using hot refining slag is recycled, Aluminum shot is added as sulfur content S≤0.003% and carries out desulfurization rapidly, outbound sulfur content S≤18ppm；
C. VD vacuum refining: 150t charge weight ladle VD furnace fidelity sky, which is pressed, is greater than 15min control, feeds calcium after breaking sky into VD furnace Line, the soft blow time is greater than 12min after breaking sky；
D. continuous casting: continuous casting process uses protective casting.
It is lower to control converter tapping according to the process characteristic of smelting process according to the mechanism for taking off S and de- B in steel by the present invention B and S content；Aluminum shot deoxidation is not used in LF furnace initial smelting period, manganese metal is added and is tuned into point, B's and commercial weight is controlled, according to steel Middle S content is suitably added aluminum shot desulfurization rapidly in the later period；VD furnace guarantees to be vacuum-treated and the soft blow time.Pass through 120t converter top bottom Multiple oxygen blast gas, which is smelted, increases argon gas stirring, all lower molten steel of terminal oxygen, sulphur and boron is obtained, by spreading on steel slag surface after tapping A certain amount of aluminum shot guarantees the reproducibility of steel slag；It does not use the early period of LF refining aluminum shot to carry out slag making deoxidation and uses recycling heat State refining slag carries out wash heat, can avoid reduction B element, while the additional amount of controllable lime and synthetic slag under conditions of de- S； Vacuum carries out using VD furnace while guaranteeing vacuum processing time, stablizes S and B element content in vacuum process.By above-mentioned The implementation of measure, can be with the high cleanliness steel of steady production S≤0.002% and B≤0.0005% while not increasing cost.
Specific embodiment
The contents of the present invention are further illustrated below with reference to embodiment.
Embodiment one
Converter charge weight 150t, which smelts, is added molten iron and steel scrap, molten iron 120t, steel scrap 30t, bessemerizes process using big argon gas Stirring, terminal S=0.0042, B=0.0002.Converter tapping forbids slag using slide plate pushing off the slag, and aluminum steel 300m, aluminium block is added after furnace 309kg, lime 480kg.
LF furnace carries out wash heat, wash heat amount 920kg using hot refining slag is recycled.Initial smelting period forbids addition aluminum steel to be taken off 90 kg of pre-melted slag, 1773 kg of lime is added portionwise according to process according to the dilute thick and desulfurization situation of bits in sulphur, and manganese metal is added Equal adjusting components feed aluminum steel 780m, 100 kg of aluminum shot, big argon gas stirring desulfurization rapidly is extremely when S content is 0.0029% 0.0014, calcium line 260m is added before outbound.
VD furnace Fruit storage protects vacuum time 17mimn, feeds calcium line 120m after breaking sky, appears on the stage after soft blow 20min.
Continuous casting process uses protective casting.Using this technique finished product C=0.05, Mn=1.58, Si=0.23, P=0.008, Nb= 0.46, Alt=0.031, S=0.0016, B=0.0004, other are Fe and residual elements.
Embodiment two
Molten iron and steel scrap, molten iron 115t, steel scrap 35t is added in the 150 tons of smeltings of converter charge weight, bessemerizes process using big argon gas Stirring, terminal S=0.0039, B=0.0001.Converter tapping forbids slag using slide plate pushing off the slag, and aluminum steel 300m, aluminium is added after furnace Block 295kg, lime 452kg.
LF furnace carries out wash heat, wash heat amount 950kg using hot refining slag is recycled.Initial smelting period forbids addition aluminum steel to be taken off Pre-melted slag 95kg, lime 1528kg is added portionwise according to process according to the dilute thick and desulfurization situation of bits in sulphur, and manganese metal etc. is added Adjusting component is when S content 0.0025, feeding aluminum steel 720m, aluminum shot 120kg, big argon gas stirring desulfurization rapidly to 0.0016, out Calcium line 260m is added before standing.
VD furnace Fruit storage protects vacuum time 18min, feeds calcium line 120m after breaking sky, appears on the stage after soft blow 20min.
Continuous casting process uses protective casting.Using this technique finished product C=0.09, Mn=1.52, Si=0.28, P=0.009, Nb= 0.41, Alt=0.029, S=0.0013, B=0.0003, other are Fe and residual elements.

Claims (1)

1. a kind of production method of the low B high purity steel of low S, it is characterised in that: the chemical composition mass percentage of steel be C= 0.05~0.10, Mn=1.20~1.60, Si=0.20~0.50, P≤0.010, S≤0.002, B≤0.0005, Nb=0.40~ 0.50, Alt=0.020~0.050%, other are Fe and residual elements；It comprises the following steps that:
A. converter smelting: the additional amount and liquid steel temperature of slag charge early period are bessemerized in control, obtain basicity is higher, mobility compared with Good converter slag, while stronger Bottom Argon Stirring is used, terminal S≤50ppm, B≤2ppm are controlled, in steel slag table after tapping Face sprinkles aluminum shot to avoid tapping process slag；
B. LF refining: LF furnace initial smelting period is forbidden carrying out slag making deoxidation with aluminum shot, carries out wash heat using hot refining slag is recycled, Aluminum shot is added as sulfur content S≤0.003% and carries out desulfurization rapidly, outbound sulfur content S≤18ppm；
C. VD vacuum refining: 150t charge weight ladle VD furnace fidelity sky, which is pressed, is greater than 15min control, feeds calcium after breaking sky into VD furnace Line, the soft blow time is greater than 12min after breaking sky；
D. continuous casting: continuous casting process uses protective casting.
CN201910821772.4A 2019-09-02 2019-09-02 A kind of production method of the low B high purity steel of low S Pending CN110423952A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553406A (en) * 2020-12-04 2021-03-26 湖南华菱涟源钢铁有限公司 Steel plate and control method of content of B element in steel
CN113881828A (en) * 2021-10-25 2022-01-04 江苏长强钢铁有限公司 Method for quickly desulfurizing steel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104561429A (en) * 2014-12-25 2015-04-29 安阳钢铁股份有限公司 Silicon control method of low-carbon low-silicon steel
CN104694819A (en) * 2015-03-27 2015-06-10 山东钢铁股份有限公司 Production method for low-carbon low-silicon steel
CN106591530A (en) * 2016-12-05 2017-04-26 河钢股份有限公司承德分公司 Production method for low-silicon and low-phosphorus-and-sulfur weld wire steel
CN107841687A (en) * 2017-11-15 2018-03-27 南阳汉冶特钢有限公司 A kind of smelting process of ultralow boron steel
CN109868415A (en) * 2019-03-17 2019-06-11 湖南华菱湘潭钢铁有限公司 A kind of smelting process of the low boron pipe line steel of low-sulfur
CN110055375A (en) * 2019-04-23 2019-07-26 南京钢铁股份有限公司 A kind of Ultra-low carbon ultralow-sulfur steel smelting process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104561429A (en) * 2014-12-25 2015-04-29 安阳钢铁股份有限公司 Silicon control method of low-carbon low-silicon steel
CN104694819A (en) * 2015-03-27 2015-06-10 山东钢铁股份有限公司 Production method for low-carbon low-silicon steel
CN106591530A (en) * 2016-12-05 2017-04-26 河钢股份有限公司承德分公司 Production method for low-silicon and low-phosphorus-and-sulfur weld wire steel
CN107841687A (en) * 2017-11-15 2018-03-27 南阳汉冶特钢有限公司 A kind of smelting process of ultralow boron steel
CN109868415A (en) * 2019-03-17 2019-06-11 湖南华菱湘潭钢铁有限公司 A kind of smelting process of the low boron pipe line steel of low-sulfur
CN110055375A (en) * 2019-04-23 2019-07-26 南京钢铁股份有限公司 A kind of Ultra-low carbon ultralow-sulfur steel smelting process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553406A (en) * 2020-12-04 2021-03-26 湖南华菱涟源钢铁有限公司 Steel plate and control method of content of B element in steel
CN113881828A (en) * 2021-10-25 2022-01-04 江苏长强钢铁有限公司 Method for quickly desulfurizing steel

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