CN1966752A - Process for producing C-Mn-Al killed steel - Google Patents
Process for producing C-Mn-Al killed steel Download PDFInfo
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- CN1966752A CN1966752A CNA2006100312210A CN200610031221A CN1966752A CN 1966752 A CN1966752 A CN 1966752A CN A2006100312210 A CNA2006100312210 A CN A2006100312210A CN 200610031221 A CN200610031221 A CN 200610031221A CN 1966752 A CN1966752 A CN 1966752A
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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
Abstract
The invention discloses a production technique for smelting C-Mn-Al killed steel with converter. The steps are as following: adding hot metal and scrap into the converter, blowing oxygen, adding slagging material for smelting, adding reducer and Mn ore when the [C], [P], and [S] contents in molten steel meets with the requirement of steel to [Mn]>=0.25% and [O]<=500*10-6, top-blowing nitrogen, bottom-blowing argon or nitrogen, discharging while adding deoxidizer into the ladle, adding reduced refining slag, bottom-blowing argon or nitrogen, adding Al at CAS site for deep deoxidizing and adjusting the content of acid dissolving Al in the molten steel, refining, desulfurizing, alloying and readjusting with a LF furnace, and continuously casting in CSP. the components and various kinds of comprehensive performances of the C-Mn-Al killed steel can meet the requirements of different consumers. The invention reduces the synthetic cost 16-20 per ton steel, and has the value for generalizing.
Description
Technical field
The present invention relates to a kind of production technique of aluminium killed steel, relate in particular to a kind of production technique of utilizing oxygen coverter to smelt the C-Mn-Al killed steel of casting for the CSP continuous casting.
Background technology
Aluminium killed steel has good plasticity, is the main steel grade that CSP (CSP) is produced, and can be smelted by oxygen coverter, also can be rolled into the finished product sheet material of required specification by CSP (CSP) by electrosmelting.At present, the main method of being smelted aluminium killed steel by oxygen coverter is: with molten iron and steel scrap by a certain percentage (as 9: 1) join in the converter, the operation of blowing, and add slag making material such as lime in batches, remove sulphur (S), phosphorus impurity elements such as (P) in the molten iron, simultaneously to molten steel decarburization, desiliconization, demanganize.When molten steel terminal point composition, especially phosphorus [P], sulphur [S], carbon [C] reach when smelting the steel grade standard-required, carry out tapping steel.In tapping process, adopt metallic aluminium that molten steel is carried out deoxidation alloying, and add various alloys according to the steel grade of being smelted, as silicomanganese (Si-Mn) alloy or ferrosilicon (Fe-Si) alloy and ferromanganese (Fe-Mn) alloy, simultaneously, with metallic aluminium with sour molten aluminium (Al in the molten steel
S) adjust to the scope of defined.This technology is traditional technology, and technology maturation is easy and simple to handle; But this technology has following shortcoming:
1. in the process of bessemerizing, most manganese element in the molten iron is oxidized to manganese oxide (MnO) and enters in the slag, residual manganese [Mn]＜0.2% in the molten steel when blowing to terminal.Need in tapping process, to add manganiferous iron alloy and adjust in the molten steel [Mn] content in order to improve [Mn] content in the molten steel to the manganese composition requirement of smelt steel grade;
2. the converter terminal molten steel is the peroxidation molten steel, and oxygen [O] content height reaches as high as 1000 * 10
-6More than, and unstable, so deoxidation cost height; And molten steel terminal point carbon containing [C] is low, need carry out behind the stove carburetting and handle;
3. in tapping process, need to adopt sour molten aluminium (Al in metallic aluminium (Al) deoxidation and the control molten steel
S) content, the utilization ratio of aluminium (Al) is extremely low, causes the steel quality instability, and the production cost height.
Summary of the invention
For overcoming the problem that prior art exists, but the invention provides a kind of stabilized steel quality, improve the utilization ratio of metallic aluminium (Al), the production technique of saving the C-Mn-Al killed steel that manganeseirom consumes.
For achieving the above object, the technical solution used in the present invention is: adopt the converter of oxygen top bottom blowing to smelt C-Mn-Al killed steel.Blast-melted and steel scrap are joined in the converter by a certain percentage, and the oxygen blast melting adds slag making materials such as lime.When [C], [P], [S] content in the molten steel reach smelt in the steel grade standard-required forward direction molten steel and to add reductive agent and manganese ore, and control the manganese content and the oxygen level of molten steel terminal point well, change the top blowing oxygen autogenous cutting blowing of into top blast nitrogen, carry out the operation of argon bottom-blowing or bottom blowing nitrogen simultaneously; In the converter tapping process, in ladle molten steel, add reductor and carry out pre-deoxidation, and add the reductibility refining slag.Carry out the operation of ladle bottom blowing argon gas or bottom blowing nitrogen, utilize the carbon monoxide pressure of tension in argon gas or the nitrogen bubble reduction molten steel, make [C] and [O] in the molten steel react the purpose that reaches further deoxidation, ladle is put into the CAS station, in impregnating cover, in molten steel, add metallic aluminium (Al) molten steel is carried out deep deoxidation and aluminium alloying, thereafter ladle is transported to the LF refining station molten steel is carried out refining, desulfurization, the molten steel behind the alloying fine adjustment is sent into the casting of CSP continuous casting.
Adopt a kind of C-Mn-Al killed steel production technique that as above technical scheme provides compared with prior art, the beneficial effect of acquisition is;
1. steel quality is stable;
2. save the consumption of metallic aluminium and manganeseirom, reduce cost of alloy 20-50%;
3. the utilization ratio of metallic aluminium can improve 20-30%.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described in further detail.
Described a kind of C-Mn-Al killed steel production technique is that oxygen coverter is smelted the C-Mn-Al killed steel production technique.Join in the converter blast-melted, in converter, add the steel scrap that accounts for weight of molten iron 10-20% again, carry out the oxygen blast melting.In this process, in stove, add slag making materials such as lime.When the carbon in the molten steel [C], phosphorus [P], sulphur [S] content reach smelt the C-Mn-Al killed steel steel grade composition require before 2-3min in stove, add reductive agent in the molten steel, the indication reductive agent can be selected from carbon dust (C), silicon carbide (SiC), ferro-silicon (Fe-Si), and its add-on is 0.5-4.0kg/t
SteelAdd simultaneously the manganese ore of manganese content greater than 20-35% in stove, the add-on of manganese ore can be according to what be next definite to itself manganese content in the manganese content requirement of smelts steel grade and the manganese ore, and its add-on is generally 3.0-10.0kg/t
Steel, molten steel terminal point manganese content [Mn] is controlled at 〉=0.25%, control molten steel terminal point oxygen level [O]≤500 * 10 simultaneously
-6Change the top blowing oxygen autogenous cutting into top blast nitrogen blowing 0-3min, with molten steel in the rabbling roaster.Carry out the operation of argon bottom-blowing or bottom blowing nitrogen simultaneously, argon bottom-blowing or bottom blowing nitrogen time are 1-3min, and argon bottom-blowing or bottom blowing nitrogen intensity are 0.03-0.10m
3/ t
Steel.min, sampling analysis, after composition is qualified, the pushing off the slag tapping; Add in reductor such as silicon aluminum calcium barium alloy or silicocalcium or the silumin a kind ofly in tapping process in ladle, molten steel is carried out pre-deoxidation, the add-on of reductor is controlled at 0.1-0.5kg/t
Molten steel, simultaneously the reductibility refining slag being added ladle and carry out residue adjustment, described reductibility refining slag refers to a kind of in pre-molten slag or the synthetic slag supplying agent be market product that its add-on is 1.0-3.0kg/t
Steel, and carry out steel ladle bottom argon blowing gas or the operation of bottom blowing nitrogen, air blowing intensity is 0.02-0.08m
3/ t
Steel.min, gassing time is controlled at 3-9min, and its purpose is to utilize small argon gas or nitrogen bubble to reduce the dividing potential drop of CO in the molten steel, impels carbon and oxygen reaction in the steel, is beneficial to deoxidation of molten steel.Under the condition of ladle bottom blowing argon gas or bottom blowing nitrogen, ladle is put into the CAS station, in impregnating cover, according to the molten aluminium (Al of the existing acid of molten steel
S) content and the molten aluminium (Al of the desired acid of molten steel
S) content determines to add the metallic aluminium quantity in the ladle molten steel, adding metallic aluminium is that molten steel is carried out deep deoxidation and aluminium alloying.And with the sour molten aluminium [Al of molten steel
s] content is adjusted at the 0.015-0.02% scope.The ladle handling to LF refining furnace refining station, is carried out refining to molten steel, not only desulfurization but also carry out the fine setting of molten steel alloying composition, the molten steel after the alloy fine setting is directly for the casting of CSP continuous casting.
Embodiment 1
Smelt C-Mn-Al killed steel Q235B on 100 tons of oxygen coverters, pour 100 tons of converters into 90t is blast-melted, add 10 tons of steel scraps simultaneously, the oxygen blast melting adds slag making material such as lime in stove.2min adds 1.0kg/t in stove before [C], [P], [S] content in the molten steel reach the Q235B smelting requirements
SteelReductive agent such as silicon carbide add 3.0kg/t simultaneously in stove
SteelManganese content is 35% manganese ore, with molten steel terminal point manganese [Mn] control 0.25%, controls molten steel terminal point oxygen [O]≤500 * 10 simultaneously
-6, top blast nitrogen 0.5min, argon bottom-blowing 0.5min, argon bottom-blowing intensity is 0.05m
3/ t
SteelMin, sampling analysis, after composition is qualified, the pushing off the slag tapping; In tapping process, in ladle, add 0.2kg/t
SteelReductor such as silicon aluminum calcium barium alloy carry out pre-deoxidation to molten steel, add 3.0kg/t simultaneously in ladle
SteelReductibility refining slag such as pre-molten slag carry out the argon bottom-blowing operation to ladle, and blowing argon gas intensity is 0.05m
3/ t
SteelMin, blowing argon gas time 3min; Then the CAS station is arrived in the ladle handling, and in ladle, add metallic aluminium (Al), adjust sour molten aluminium [Al in the molten steel
S] content is 0.018%, confession LF refining furnace refining is also carried out the fine setting of molten steel alloy ingredient, send the casting of CSP continuous casting.Steel finished product composition C=0.18%, Mn=0.39%, Si=0.15%, comprehensive ton steel cost reduces by 16 yuan.
Embodiment 2
On 100 tons of oxygen coverters, smelt C-Mn-Al killed steel Q235B.With 90 tons of blast-melted pouring in 100 tons of converters, add 15 tons of steel scraps simultaneously, the oxygen blast melting adds slag making material such as lime in stove.2.5min adds 2.5kg/t in the molten steel in stove before [C], [P], [S] content in the molten steel reach the Q235B smelting requirements
SteelReductive agent such as ferrosilicon add 7.0kg/t simultaneously in stove
SteelManganese ore is controlled at 0.30% with molten steel terminal point manganese [Mn], control molten steel terminal point oxygen [O]≤500 * 10
-6Top blowing oxygen is switched to top blast nitrogen 2.0min, steel melting furnace is carried out the BOTTOM ARGON BLOWING operation, BOTTOM ARGON BLOWING 2.5min, blowing argon gas intensity is 0.10m
3/ t
Steel.min, sampling analysis, after composition is qualified, the pushing off the slag tapping; In tapping process, in ladle, add 0.35kg/t
SteelReductor such as silicocalcium carry out pre-deoxidation to molten steel, add 2.0kg/t simultaneously in ladle
SteelThe reductibility refining slag carries out the operation of bottom blowing nitrogen as synthetic slag supplying agent to ladle, and nitrogen blowing intensity is 0.025m
3/ t
SteelMin.The nitrogen blowing time is 9min.Then the CAS station is arrived in the ladle handling, and in ladle, add metallic aluminium (Al), adjust sour molten aluminium (Al in the molten steel
S) content is 0.02%, send the refining of LF refining furnace and carries out the fine setting of molten steel alloy ingredient, send the casting of CSP continuous casting.Steel finished product composition C=0.19%, Mn=0.38%, Si=0.16%, ton steel comprehensive cost can reduce by 18 yuan.
Embodiment 3
On the 100t oxygen coverter, smelt C-Mn-Al killed steel Q235B.95 tons of molten iron are poured in the converter stove, and added 9.5 tons of steel scraps.The oxygen blast melting adds slag making material such as lime in stove.3min added 4.0kg/t before [C], [P], [S] content reached the Q235B smelting requirements in the molten steel in the molten steel in stove
SteelReductive agent such as silicon carbide add 10kg/t simultaneously in stove
SteelManganese ore is controlled at 0.33% with molten steel terminal point manganese [Mn], control molten steel terminal point oxygen [O]≤500 * 10
-6, top blowing oxygen is switched to top blast nitrogen 3min, and carry out the BOTTOM ARGON BLOWING operation, argon bottom-blowing time 1.5min, argon bottom-blowing intensity is 0.07m
3/ t
Steel.min, sampling analysis, after composition is qualified, the pushing off the slag tapping.In tapping process, add 0.5kg/t to ladle
SteelReductor such as silumin add 1.0kg/t simultaneously in ladle
SteelReductibility refining slag such as pre-melted slag. ladle is carried out the argon bottom-blowing operation, and blowing argon gas intensity is 0.06m
3/ t
SteelMin, the blowing argon gas time is 6min, then the CAS station is arrived in the ladle handling, and add metallic aluminium in ladle, adjusts sour molten aluminium (Al in the molten steel
s) content is 0.018%.Send the LF refining furnace to carry out the fine setting of molten steel alloy ingredient, send the casting of CSP continuous casting.Steel finished product composition: C=0.18%, Mn=0.40%, Si=0.17%, ton steel comprehensive cost can reduce by 20 yuan.
Claims (1)
1, a kind of production technique of C-Mn-Al killed steel, join in the converter blast-melted, in converter, add the steel scrap that accounts for weight of molten iron 10～20% again, the oxygen blast melting, in stove, add slag making materials such as lime, it is characterized in that: when [C] in the molten steel, [P], [S] content reach smelt the requirement of steel grade composition before 2-3min in stove, add 0.5-4.0kg/t in the molten steel
SteelReductive agent adds 3.0-10.0kg/t simultaneously in stove
SteelManganese content is greater than the manganese ore of 20-35%, molten steel terminal point manganese [Mn] content is controlled at 〉=0.25%, control molten steel terminal point oxygen level [O]≤500 * 10
-6Change the top blowing oxygen autogenous cutting into top blast nitrogen blowing 0-3min; Carry out the operation of argon bottom-blowing or bottom blowing nitrogen simultaneously, argon bottom-blowing or bottom blowing nitrogen time are 1-3min, and argon bottom-blowing or bottom blowing nitrogen intensity are 0.03-0.10m
3/ t
Steel.min, sampling analysis, after composition is qualified, the pushing off the slag tapping; In tapping process, in ladle, add 0.1-0.5kg/t
SteelReductor adds 1.0-3.0kg/t simultaneously in ladle
SteelThe reductibility refining slag; Carry out the operation of ladle bottom blowing argon gas or bottom blowing nitrogen, air blowing intensity is 0.02-0.08m
3/ t
SteelMin, gassing time is controlled at 3-9min; Ladle is put into the CAS station, and in impregnating cover, the acid-soluble aluminum content that requires according to existing acid-soluble aluminum content and molten steel in the molten steel adds metallic aluminium in ladle molten steel, and the acid-soluble aluminum content of adjusting in the molten steel is 0.015-0.02%; The ladle handling to LF refining furnace refining station, is carried out the fine setting of molten steel alloy ingredient, and the molten steel after the alloy fine setting send the casting of CPS continuous casting; Wherein
Manganese ore can be selected from: manganese content is greater than the manganese ore of 20-35%
Reductive agent is selected from: a kind of in carbon dust (C), silicon carbide (SiC), ferrosilicon (Fe-Si) alloy,
Reductor is selected from: a kind of in silicon aluminum calcium barium alloy, silicocalcium, the silumin, the reductibility refining slag is selected from: pre-melted slag, a kind of in the synthetic slag supplying agent.
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| CNB2006100312210A CN100436627C (en) | 2006-02-11 | 2006-02-11 | Process for producing C-Mn-Al killed steel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333617B (en) * | 2007-06-26 | 2010-09-08 | 宝山钢铁股份有限公司 | Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method |
| CN101914652A (en) * | 2010-08-27 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon and low-silicon steel deoxidation process |
| CN102051435A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting low-carbon aluminium-killed steel and method for continuously casting low-carbon aluminium-killed steel |
| CN102161050A (en) * | 2011-04-11 | 2011-08-24 | 德清县宝德炉料有限公司 | Method for treating waste sliding plates to recycle by biological method |
| CN102220448A (en) * | 2011-06-02 | 2011-10-19 | 首钢总公司 | Method for smelting uniform end-point molten steel composition with converter |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN103451350A (en) * | 2013-08-13 | 2013-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen content in molten steel |
| CN105695661A (en) * | 2016-02-16 | 2016-06-22 | 湖南华菱涟源钢铁有限公司 | Method for smelting Q235B steel through CSP (compact strip production) line |
| CN111206181A (en) * | 2020-02-28 | 2020-05-29 | 钢铁研究总院 | Smelting method of alloy steel containing phosphorus and copper |
| CN113981302A (en) * | 2020-12-24 | 2022-01-28 | 天津荣程联合钢铁集团有限公司 | Aluminum-containing low-carbon steel and preparation process thereof |
| CN115505682A (en) * | 2022-09-14 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Method for shortening smelting time of low-carbon aluminum killed steel LF furnace |
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| JPS59129714A (en) * | 1983-01-17 | 1984-07-26 | Kawasaki Steel Corp | Method for controlling form of inclusion in aluminum killed steel for cold rolled sheet |
| JP3430672B2 (en) * | 1994-10-18 | 2003-07-28 | Ｊｆｅスチール株式会社 | Melting method of ultra-low carbon aluminum killed steel |
| JP3619283B2 (en) * | 1995-04-20 | 2005-02-09 | 新日本製鐵株式会社 | Method for producing medium carbon Al killed steel |
| CN1216174C (en) * | 2002-12-13 | 2005-08-24 | 涟源钢铁集团有限公司 | Low-carbon silicon steel strip for cold rolling and producting process thereof |
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| CN101333617B (en) * | 2007-06-26 | 2010-09-08 | 宝山钢铁股份有限公司 | Stabilizing process for treating aluminium-silicon killed steel by sealed argon-blowing method |
| CN102051435A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting low-carbon aluminium-killed steel and method for continuously casting low-carbon aluminium-killed steel |
| CN101914652A (en) * | 2010-08-27 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon and low-silicon steel deoxidation process |
| CN102161050A (en) * | 2011-04-11 | 2011-08-24 | 德清县宝德炉料有限公司 | Method for treating waste sliding plates to recycle by biological method |
| CN102220448A (en) * | 2011-06-02 | 2011-10-19 | 首钢总公司 | Method for smelting uniform end-point molten steel composition with converter |
| CN102943150B (en) * | 2012-11-26 | 2015-03-04 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN103451350A (en) * | 2013-08-13 | 2013-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen content in molten steel |
| CN103451350B (en) * | 2013-08-13 | 2015-04-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen content in molten steel |
| CN105695661A (en) * | 2016-02-16 | 2016-06-22 | 湖南华菱涟源钢铁有限公司 | Method for smelting Q235B steel through CSP (compact strip production) line |
| CN105695661B (en) * | 2016-02-16 | 2018-04-17 | 湖南华菱涟源钢铁有限公司 | A kind of method that CSP production lines smelt Q235B steel |
| CN111206181A (en) * | 2020-02-28 | 2020-05-29 | 钢铁研究总院 | Smelting method of alloy steel containing phosphorus and copper |
| CN113981302A (en) * | 2020-12-24 | 2022-01-28 | 天津荣程联合钢铁集团有限公司 | Aluminum-containing low-carbon steel and preparation process thereof |
| CN115505682A (en) * | 2022-09-14 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Method for shortening smelting time of low-carbon aluminum killed steel LF furnace |
| CN115505682B (en) * | 2022-09-14 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Method for shortening smelting time of low-carbon aluminum killed steel LF furnace |
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