CN101792843B - Production process of Nb-containing mill coil for automobile - Google Patents

Production process of Nb-containing mill coil for automobile Download PDF

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Publication number
CN101792843B
CN101792843B CN2010100179988A CN201010017998A CN101792843B CN 101792843 B CN101792843 B CN 101792843B CN 2010100179988 A CN2010100179988 A CN 2010100179988A CN 201010017998 A CN201010017998 A CN 201010017998A CN 101792843 B CN101792843 B CN 101792843B
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automobile
tapping
rolling
production
temperature
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CN101792843A (en
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朱俊虹
马照红
郜书忠
俞日军
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a production process of a Nb-containing mill coil for automobile; the production process comprises the following working procedures: raw material preparation, EAF eccentric bottom tapping arc furnace smelting, LF external refining, VD vacuum arc degassing processing, CCM continuous casting, continuous-casting shot blasting, fault detection, heating, 3/4 continuous system rolling and curling steel belt; in the invention, Nb is used as microalloying element and has obvious refined grain action; the toughness is improved while improving intensity, the cold bending property is good and the integrated mechanical property is high; continuous casting production process is adopted, rolling in one heat is used, the energy consumption is low, the production period is short and the comprehensive rolling yield is high.

Description

A kind of production technique that contains the Nb automobile with mill coil
Technical field
The invention belongs to field of metallurgy, relate to the production technique of a kind of Nb of containing automobile with mill coil.
Background technology
The Hot Rolling Automobile beam is mainly used to make the vehicle frame (chassis) of automobile with steel, and wherein railway carriage longeron, crossbeam are mainly low alloy steel and carbon steel with steel.Important load-supporting part and safety member that the automobile beam is used as vehicle structure with steel, the forming manufacture technique complexity, material requirements has higher strength and toughness, clod wash and fatigue resistance.Present domestic employing wide steel strip is sheared back production Hot Rolling Automobile beam, the technology that does not adopt Ribbon Steel to produce.Produce after adopting Ribbon Steel production and adopting wide steel strip to shear and compare, Ribbon Steel limit portion is the nature limit, and over-all properties is better with steel than the beam after shearing.Adopt the TL1114Ti trade mark from the automobile of external import with the mill coil material, its added ingredients Ti when adding Ti, is easy to generate TiN and is mingled with, and has reduced the comprehensive mechanical performance of product.
Summary of the invention
When adding Ti, be easy to generate the problem that TiN is mingled with in order to overcome prior art, the object of the present invention is to provide the production technique of a kind of Nb of containing automobile with mill coil, this production technique is simple, energy consumption is low, low equipment investment, production efficiency height, good product quality, when improving intensity, also improve toughness, obtained comprehensive mechanical performance preferably.
The objective of the invention is to be achieved through the following technical solutions:
A kind of production technique that contains the Nb automobile with mill coil is characterized in that this production technique comprises following operation: raw material preparation, EAF eccentric bottom tapping electric arc furnace smelting, LF external refining, VD vacuum outgas processing, CCM continuous casting, continuously cast bloom ball blast, flaw detection, heating, rolling, the curling steel band of 3/4 continous way.
Wherein, raw material preparation process: furnace charge is made up of high-quality steel scrap, molten iron and the pig iron, and the harmful residual element total amount of control is in 0.15%; Every stove molten iron amount of allocating into is greater than 40%; All are gone into the stove starting material and keep dry, and add behind the alloy baking.
EAF electrosmelting operation: carbon content before the tapping≤0.06%, phosphorus content≤0.008%; Aluminium deoxidizer in compound adopts low carbon ferromanganese, low phosphorus and low carbon ferro-silico-manganese, 1600 ~ 1670 ℃ of tapping temperatures.
LF external refining operation: the Nb element of adding 0.03%~0.05%, refining time 〉=50 minute, with SiAlCa and calcium carbide diffusive deoxidation, soft blow argon gas churning time was greater than 10 minutes, to promote inclusion floating, refining every stove molten steel in latter stage is fed 100 ~ 300 meters on CaSi line, and tapping temperature is controlled at 1600 ℃ ~ 1650 ℃.
VD vacuum outgas operation: the following hold-time of condition of high vacuum degree at 1mbar is not less than 10min, the control hydrogen richness is not more than 2ppm, sampling analysis behind the vacuum breaker, according to chemical ingredients fine setting Al content, molten steel was fed 100~200 meters on CaFe line after 2min was mixed in soft blow Ar gas mixing again, and behind the feeding Ca-Fe line, soft blow Ar gas mixing is mixed, time greater than 10 minutes to promote inclusion floating, tapping temperature is controlled at 1560 ℃~1580 ℃.Obtaining molten steel composition weight percent is, C:0.08-0.13, and Mn:0.90-125, P., S :≤0.010, Si:0.10-0.30, Nb:0.03-0.05, Al:0.02-0.07, Cr, Ni, Cu :≤0.15.
The CCM continuous casting working procedure: the continuous casting section is 150mm * 150mm; The continuous casting total process protective casting; Adopt crystallizer and solidification end combination induction stirring (M+F-EMS); The target superheating temperature is less than 30 ℃, and is cold by force; Pulling rate is 1.4 ~ 2.5m/min, connects to water the stove number less than 8 stoves.
Continuously cast bloom ball blast, flaw detection: continuously cast bloom by Zhi Jinhang ball blast, flaw detection, is checked, defective continuously cast bloom is carried out reconditioning handle.
3/4 continous way is rolling, steel band curls: start rolling temperature is 1080 ~ 1130 ℃, and advancing final rolling temperature is 960 ~ 1000 ℃, goes out finish rolling and curls after tank and blower fan cooling, and curling temperature is 590 ~ 620 ℃.
The present invention shears back production with domestic employing wide steel strip and compares, and Ribbon Steel limit portion is the nature limit, and over-all properties is better with steel than the beam after shearing.The present invention has tangible crystal grain thinning effect with Nb as micro alloying element, low cost of manufacture, and inclusion is few, has also improved toughness when improving intensity, and cold-bending property is good, the comprehensive mechanical performance height.
Embodiment
A kind of trade mark is the production technique of TL1114Nb automobile with mill coil, comprises following operation: raw material preparation, EAF eccentric bottom tapping electric arc furnace smelting, LF external refining, VD vacuum outgas processing, CCM continuous casting, continuously cast bloom ball blast, flaw detection, heating, rolling, the curling steel band of 3/4 continous way.
Wherein, raw material preparation process: furnace charge is made up of high-quality steel scrap, molten iron and the pig iron, and the harmful residual element total amount of control is in 0.15%; Every stove molten iron amount of allocating into is greater than 40%; All are gone into the stove starting material and keep dry, and add behind the alloy baking.
EAF electrosmelting operation: carbon content before the tapping≤0.06%, phosphorus content≤0.008%; Aluminium deoxidizer in compound adopts low carbon ferromanganese, low phosphorus and low carbon ferro-silico-manganese, 1600 ~ 1670 ℃ of tapping temperatures.
LF external refining operation: made reducing slag in refining furnace, FeO adds 0.03%~0.05% Nb element less than 1% in the slag, can add the Nb alloy.Refining time 〉=50 minute, with SiAlCa and calcium carbide diffusive deoxidation, soft blow argon gas churning time was greater than 10 minutes, and to promote inclusion floating, refining every stove molten steel in latter stage is fed 100 ~ 300 meters on CaSi line, and tapping temperature is controlled at 1600 ℃ ~ 1650 ℃.
VD vacuum outgas operation: the following hold-time of condition of high vacuum degree at 1mbar is not less than 10min, the control hydrogen richness is not more than 2ppm, sampling analysis behind the vacuum breaker, according to chemical ingredients fine setting Al content, molten steel was fed 100~200 meters on CaFe line after 2min was mixed in soft blow Ar gas mixing again, and behind the feeding Ca-Fe line, soft blow Ar gas mixing is mixed, time greater than 10 minutes to promote inclusion floating, tapping temperature is controlled at 1560 ℃~1580 ℃.Obtaining molten steel composition weight percent is, C:0.08-0.13, and Mn:0.90-1.25, P., S :≤0.010, Si:0.10-0.30, Nb:0.03-0.05, Al:0.02-0.07, Cr, Ni, Cu :≤0.15.
The CCM continuous casting working procedure: the continuous casting section is 150mm * 150mm; The continuous casting total process protective casting; Adopt crystallizer and solidification end combination induction stirring; The target superheating temperature is less than 30 ℃, and is cold by force; Pulling rate is 1.4 ~ 2.5m/min, connects to water several 6 stoves of stove.
Continuously cast bloom ball blast, flaw detection: continuously cast bloom by Zhi Jinhang ball blast, flaw detection, is checked, defective continuously cast bloom is carried out reconditioning handle.
3/4 continous way is rolling, steel band curls: start rolling temperature is 1080 ~ 1130 ℃, and advancing final rolling temperature is 960 ~ 1000 ℃, goes out finish rolling and curls after tank and blower fan cooling, and curling temperature is 590 ~ 620 ℃.
This TL1114Nb automobile mill coil chemical ingredients such as table one:
Table one: TL1114Nb automobile mill coil, Wt%
TL1114Nb ?C Mn P.S Si Nb Al Cr、Ni、Cu
Judge ?0.08-0.13 0.90-1.25 ≤0.010 0.10-0.30 0.03-0.05 0.02-0.07 ≤0.15
The present invention has tangible crystal grain thinning effect, low cost of manufacture, comprehensive mechanical performance height with Nb as micro alloying element.

Claims (4)

1. one kind contains the production technique that the Nb automobile is used mill coil, it is characterized in that this production technique comprises following operation:
1) raw materials for metallurgy is prepared; Furnace charge is made up of high-quality steel scrap, molten iron and the pig iron, and the harmful residual element total amount of control is in 0.15%; Molten iron and the pig iron amount of allocating into are greater than 40%; All are gone into the stove starting material and keep dry, and add behind the alloy baking;
2) EAF eccentric bottom tapping electric arc furnace smelting; Carbon content before the tapping≤0.06%, phosphorus content≤0.008%; Aluminium deoxidizer in compound adopts low carbon ferromanganese, low phosphorus and low carbon ferro-silico-manganese, 1600~1670 ℃ of tapping temperatures;
3) LF external refining; Add 0.03%~0.05% Nb element, refining time 〉=50 minute are with SiAlCa and calcium carbide diffusive deoxidation, soft blow argon gas churning time was greater than 10 minutes, make inclusion floating, refining molten steel in latter stage is fed 100~300 meters on CaSi line, and tapping temperature is controlled at 1600 ℃~1650 ℃;
4) the VD vacuum outgas is handled; Be not less than 10min in the following hold-time of condition of high vacuum degree, the control hydrogen richness is not more than 2ppm, and tapping temperature is controlled at 1538 ℃~1548 ℃; Obtaining molten steel composition weight percent is, C:0.08-0.13, and Mn:0.90-1.25, P, S :≤0.010, Si:0.10-030, Nb:0.03-0.05, Al:0.02-0.07, Cr, Ni, Cu :≤0.15;
5) CCM continuous casting; The continuous casting total process protective casting; Adopt crystallizer and solidification end combination induction stirring; The target superheating temperature is less than 30 ℃, and is cold by force; Pulling rate is 1.4~2.5m/min;
6) continuously cast bloom ball blast, flaw detection;
7) 3/4 continous way is rolling, curling; Thick machine start rolling temperature is 1080~1130 ℃, in to roll temperature be 960~1000 ℃, it is curling through tank and blower fan cooling back to go out finish rolling, curling temperature is 590~620 ℃.
2. the production technique that contains the Nb automobile with mill coil according to claim 1 is characterized in that: in the step 4), be not less than 10min in the following hold-time of condition of high vacuum degree of 1mbar.
3. the production technique that contains the Nb automobile with mill coil according to claim 1, it is characterized in that: in the step 5), the continuous casting section is 150mm * 150mm.
4. the production technique that contains the Nb automobile with mill coil according to claim 1 is characterized in that: in the step 6), continuously cast bloom by Zhi Jinhang ball blast, flaw detection, inspection, is carried out reconditioning to defective continuously cast bloom and handles.
CN2010100179988A 2010-01-19 2010-01-19 Production process of Nb-containing mill coil for automobile Active CN101792843B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103276143A (en) * 2013-06-07 2013-09-04 南京钢铁股份有限公司 Automobile steel and production technology thereof
CN103695766B (en) * 2013-12-03 2016-06-29 武汉钢铁(集团)公司 Tensile strength 440MPa level hot rolling high tensile thin steel plate and production method thereof
CN104480249A (en) * 2014-12-23 2015-04-01 信阳同合车轮有限公司 Deoxidation method for wheel steel smelting
CN105039856A (en) * 2015-09-11 2015-11-11 首钢总公司 High-strength cold-formed automobile axle housing steel and production method thereof
CN109097681B (en) * 2018-08-15 2020-09-29 敬业钢铁有限公司 High-strength low-inclusion automobile steel plate and electromagnetic stirring process thereof in continuous casting process
CN110180900B (en) * 2019-06-25 2020-07-14 东北大学 Thickness control method for thick specification narrow strip steel

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CN1759976A (en) * 2004-10-11 2006-04-19 杭州钢铁集团公司 Technique for producing 55CrSi bull rod steel
CN1990137A (en) * 2005-12-26 2007-07-04 天津钢管集团有限公司 Technique for preventing surface crack of continuous casting steel billet for petroleum casing

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CN1759976A (en) * 2004-10-11 2006-04-19 杭州钢铁集团公司 Technique for producing 55CrSi bull rod steel
CN1990137A (en) * 2005-12-26 2007-07-04 天津钢管集团有限公司 Technique for preventing surface crack of continuous casting steel billet for petroleum casing

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