CN106399632B - A kind of high-carbon steel carburetion method - Google Patents

A kind of high-carbon steel carburetion method Download PDF

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Publication number
CN106399632B
CN106399632B CN201610815116.XA CN201610815116A CN106399632B CN 106399632 B CN106399632 B CN 106399632B CN 201610815116 A CN201610815116 A CN 201610815116A CN 106399632 B CN106399632 B CN 106399632B
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carbon
steel
carburetting
argon
tapping
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CN106399632A (en
Inventor
朱万军
齐江华
王春锋
沈继胜
杨成威
张剑君
彭著刚
孙伟
曹同友
陈俊孚
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/072—Treatment with gases

Abstract

The present invention provides a kind of high-carbon steel carburetion methods, include the following steps：When converter high-carbon steel is tapped, a small amount of carburant deoxidation carburetting is first added, then carry out alloying, then add a large amount of carburant carburetting again；LF arrives at a station aluminum deoxidation, and feeds carbon line according to preceding process ingredient and carry out carburetting.In the present invention, pass through a small amount of carburetting deoxidation converter early period and later stage a large amount of carburetting, and carry out accurate carburetting in refining process, solve the problems, such as that the control of high-carbon steel carbon component is unstable, reduce the generation of deoxidation products, it ensures the uniformity and stability of high-carbon steel carbon component, improves high-carbon steel Cleanliness of Molten Steel.

Description

A kind of high-carbon steel carburetion method
Technical field
The invention belongs to field of steel-making, and in particular to one kind carries out carburetting in converter tapping and refining process to high-carbon steel Method.
Background technology
High-carbon steel needs good mainly for the manufacture of the special steels such as tool, cutlery, saw blade, spring, gear, this kind of steel Intensity, toughness, hardness, wearability, fatigability and temper resistance.Carbon is to improve steel strength and the essential element of hardness, carbon The fluctuation of content can affect greatly the intensity and hardness of product.In addition, Cleanliness of Molten Steel (P, S, O and field trash etc.) is right The processing of high-carbon steel and performance also important.To improve carbon control stability, Cleanliness of Molten Steel is improved, is generally being turned Deoxidier is added in when stove is tapped and carries out component controlling, after [O] is taken off to a certain range in steel, a large amount of carburants is added and increases Carbon, LF stoves carry out deoxidation, slag making and alloying, carbon component are finely adjusted again, and remove in steel and be mingled with.This method uses deoxidation Carburetting afterwards can cause in a large amount of deoxidation products residual steel, have an impact to Cleanliness of Molten Steel, meanwhile, the tapping later stage largely adds in increasing Carbon agent can make carburant fusing bad, cause carbon component uneven, influence to refine carburetting, cause carbon component fluctuation larger.
Chinese patent application No. is CN200910211433.0 discloses a kind of deoxidation of molten steel carburetion method and steel-making side Method, this method first add in carburant in tapping into ladle, then add in deoxidier, on the one hand the carburant first added in adjusts Carbon content in steel, the CO gases on the other hand generated using oxidation are stirred molten steel, promote deoxidation alloying, deoxidation carburetting The molten steel obtained afterwards carries out external refining.Though this method can reduce the generation of field trash, tapping initial stage adds in a large amount of carburants A large amount of CO bubbles can be generated, molten steel face is made drastically " to boil ", splash is caused when serious.
Chinese patent application No. is CN201010556238.4 discloses a kind of smelting process for production side of medium and high carbon steel Method sequentially adds Alsical, low melting point synthetic slag and alloy alloy, the 2/3 of the entirely tapping time in entire tapping Shi Suoyou alloys add；Molten steel blows Ar after tapping, then casts.This method does not use LF refining, mainly solves refining Refining treatment scarce capacity problem in the production of steel fast pace.Common high-carbon steel can be produced using this method, it will to Cleanliness of Molten Steel Seek higher high-carbon steel and improper.
Invention content
Present invention generally provides a kind of carburetion method for producing high-quality high-carbon steel, to solve current high-carbon steel carbon component not The problem of enough stabilizations and relatively low Cleanliness of Molten Steel.
The invention is realized in this way：
A kind of high-carbon steel carburetion method, it is characterised in that include the following steps：
(1) when converter high-carbon steel is tapped, a small amount of carburant deoxidation carburetting is first added, then carry out alloying, then added again Increasing amount carburant carburetting, specifically：
During (1-1) tapping 1/4, the carburant of addition≤2.5kg/t steel carries out deoxidation carburetting；
(1-2) tapping 1/3 when, according to molten steel composition add alloy carry out alloying, tapping 1/2 when add a large amount of carburetting Agent carburetting, and add the lime of 1.5-4.0kg/t steel and the refining slag of 0.5-1.2kg/t steel, when tapping to 2/3, all alloys It has added；
(1-3) converter tapping carbon increasing amount reaches more than 85% desired value；
(2) ladle stirs 3-5min to argon station Argon, and Argon intensity is 0.15-0.75Nm3/(h·t)；
(3) LF arrives at a station aluminum deoxidation, and feeds carbon line according to preceding process ingredient and carry out carburetting, carbon increasing amount 0.1- 0.8Kg/t steel；
(4) it is stirred after carburetting using big argon gas amount, Argon intensity is 0.15-0.75Nm3/ (ht), and heat and make Slag；
(5) alloying is carried out to molten steel, and appropriate carbon line carburetting is fed according to desired value；
(6) after adjusting carbon, more than soft blow argon 8min, Argon intensity is 0.03-0.06Nm3/ (ht), it is ensured that ingredient Uniformly.
In the present invention, a small amount of carburant is added in tapping, on the one hand reduces free oxygen in steel, reduces deoxidation products generation, separately On the one hand carburetting is carried out, reduces later stage carbon increasing amount, promotes carburant fusing.On the one hand the tapping later stage adds lime and refining slag slag making Slag is avoided to harden, promotes carburant fusing mixing, on the other hand shifts to an earlier date slag making.LF refining feeds carbon line carburetting early period, mainly Extend the fusing time of carbon, promote the mixing of carbon, improve the control accuracy of carbon.
This method is accurately increased by a small amount of carburetting deoxidation converter early period and later stage a large amount of carburetting in refining process Carbon solves the problems, such as that the control of high-carbon steel carbon component is unstable, reduces the generation of deoxidation products, it is ensured that high-carbon steel carbon component Uniformity and stability improve high-carbon steel Cleanliness of Molten Steel.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.It should be noted that hundred involved by below Divide than content, be mass percent.
Embodiment 1：
To be illustrated for smelting the high-carbon steel of target [C]=0.6% (internal control 0.57-0.62%).Converter terminal [C] Be 0.05%, [O] be 0.06%, when tapping to 1/4, add 1.5kg/t steel graphite carbon ball carburants, tapping 1/3 when, according to molten steel Ingredient adds appropriate silicomangan and carries out alloying, and when tapping 1/2 adds 5.25kg/t steel graphite carbon ball carburant carburetting, and add Add the lime of 1.0kg/t steel and the refining slag (CaO of 0.5kg/t steel:45%, Al2O3:35%, Al:13%, SiO2:2%) it, taps extremely When 2/3, all alloys have added.Molten steel stirs 3min, Argon intensity 0.15Nm to argon station Argon3/ (ht), then transports to LF stoves.Aluminum steel deoxidation is fed after to LF stoves, the carbon line of 0.1 kg/t steel is then fed according to argon station ingredient, is carried out after having fed carbon line Big argon gas stirring, air blowing intensity 0.15Nm3/ (ht), and begin to warm up and make white slag.According to target ingredient carries out alloy to slag making mid-term Change, and carbon line feed quantity is determined according to the ingredient of inspection.After making white slag, soft blow argon 8min, Argon intensity 0.03Nm3/ (h·t).Middle ladle sample is taken to examine, [C]=0.58%, T [O]=15 × 10-6 in steel, [N]=0.005%, [P]=0.012%, [S]= 0.003%。
Embodiment 2：
To be illustrated for smelting the high-carbon steel of target [C]=0.85% (internal control 0.82-0.86%).Converter terminal [C] Be 0.08%, [O] be 0.04%, when tapping to 1/4, add 2.5kg/t steel graphite carbon ball carburants, tapping 1/3 when, according to molten steel Ingredient adds appropriate silicomangan and carries out alloying, and when tapping 1/2 adds 5.5kg/t steel graphite carbon ball carburant carburetting, and add Add the lime of 4.0kg/t steel and the refining slag (CaO of 1.0kg/t steel:45%, Al2O3:35%, Al:13%, SiO2:2%) it, taps extremely When 2/3, all alloys have added.Molten steel stirs 5min, Argon intensity 0.55Nm to argon station Argon3/ (ht), then transports LF to Stove.Aluminum steel deoxidation is fed after to LF stoves, the carbon line of 0.15 kg/t steel is then fed according to argon station ingredient, is carried out after having fed carbon line Big argon gas stirring, air blowing intensity 0.35Nm3/ (ht), and begin to warm up and make white slag.According to target ingredient carries out alloy to slag making mid-term Change, and carbon line feed quantity is determined according to the ingredient of inspection.After making white slag, soft blow argon 10min, Argon intensity 0.05Nm3/ (h·t).Middle ladle sample is taken to examine, [C]=0.86%, T [O]=12 × 10-6 in steel, [N]=0.0045%, [P]=0.016%, [S]= 0.002%。
Embodiment 3：
To be illustrated for smelting the high-carbon steel of target [C]=1.0% (internal control 0.97-1.04%).Converter terminal [C] Be 0.04%, [O] be 0.070%, when tapping to 1/4, add 1.0kg/t steel graphite carbon ball carburants, tapping 1/3 when, according to steel Water constituent adds appropriate silicomangan and carries out alloying, and when tapping 1/2 adds 7.5kg/t steel graphite carbon ball carburant carburetting, and Add the lime of 3.0kg/t steel and the refining slag (CaO of 1.2kg/t steel:45%, Al2O3:35%, Al:13%, SiO2:2%) it, taps During to 2/3, all alloys have added.Molten steel stirs 4min, Argon intensity 0.75Nm to argon station Argon3/ (ht), Ran Houyun Toward LF stoves.Aluminum steel deoxidation is fed after to LF stoves, the carbon line of 0.8 kg/t steel is then fed according to argon station ingredient, it is laggard to have fed carbon line The big argon gas stirring of row, air blowing intensity 0.75Nm3/ (ht), and begin to warm up and make white slag.According to target ingredient is closed slag making mid-term Aurification, and carbon line feed quantity is determined according to the ingredient of inspection.After making white slag, soft blow argon 12min, Argon intensity 0.06Nm3/ (h·t).Middle ladle sample is taken to examine, [C]=1.02%, T [O]=14 × 10-6 in steel, [N]=0.0055%, [P]=0.011%, [S]= 0.0025%。

Claims (1)

1. a kind of high-carbon steel carburetion method, it is characterised in that include the following steps：
(1) when converter high-carbon steel is tapped, a small amount of carburant deoxidation carburetting is first added, then carry out alloying, then added again big Carburant carburetting is measured, specifically：
During (1-1) tapping 1/4, the carburant of addition≤2.5kg/t steel carries out deoxidation carburetting；
During (1-2) tapping 1/3, alloy is added according to molten steel composition and carries out alloying, when tapping 1/2 adds a large amount of carburants and increases Carbon, and the lime of 1.5-4.0kg/t steel and the refining slag of 0.5-1.2kg/t steel are added, when tapping to 2/3, all alloy additions It is complete；
(1-3) converter tapping carbon increasing amount reaches more than 85% desired value；
(2) ladle stirs 3-5min to argon station Argon, and Argon intensity is 0.15-0.75Nm3/(h·t)；
(3) LF arrives at a station aluminum deoxidation, and feeds carbon line according to preceding process ingredient and carry out carburetting, and carbon increasing amount is 0.1-0.8Kg/t steel；
(4) it is stirred after carburetting using big argon gas amount, Argon intensity is 0.15-0.75Nm3/ (ht), and heat slag making；
(5) alloying is carried out to molten steel, and appropriate carbon line carburetting is fed according to desired value；
(6) after adjusting carbon, more than soft blow argon 8min, Argon intensity is 0.03-0.06Nm3/ (ht), it is ensured that ingredient is uniform.
CN201610815116.XA 2016-09-09 2016-09-09 A kind of high-carbon steel carburetion method Active CN106399632B (en)

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CN107385139A (en) * 2017-07-30 2017-11-24 湖南华菱湘潭钢铁有限公司 A kind of smelting process of high-carbon steel
CN108251598B (en) * 2018-01-12 2020-05-05 唐山钢铁集团有限责任公司 Carbon increasing and nitrogen controlling production method of medium-carbon high-alloy steel
CN113088628A (en) * 2021-03-31 2021-07-09 山东钢铁股份有限公司 LF refining method of low-carbon steel
CN113699314B (en) * 2021-09-09 2022-10-11 江苏利淮钢铁有限公司 Control method for tapping slag condition of high-carbon and high-alloy steel 90t converter

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CN104498661A (en) * 2014-12-24 2015-04-08 安阳钢铁股份有限公司 Control method for high-carbon steel content
CN105087851A (en) * 2015-08-28 2015-11-25 桂林昌鑫机械制造有限公司 Method for smelting high-carbon steel with semisteel

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CN102010926A (en) * 2010-11-24 2011-04-13 南京钢铁股份有限公司 Process for smelting and producing medium high carbon steel
CN102994694A (en) * 2011-09-10 2013-03-27 鞍钢股份有限公司 Method for efficiently carbureting LF furnace molten steel
CN103160636A (en) * 2011-12-19 2013-06-19 攀钢集团西昌钢钒有限公司 Method for converter steel tapping alloying molten steel component evening
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