CN108728737A - A kind of Ultra-low carbon battery case cold-rolled steel sheet and production method - Google Patents

A kind of Ultra-low carbon battery case cold-rolled steel sheet and production method Download PDF

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Publication number
CN108728737A
CN108728737A CN201810346082.3A CN201810346082A CN108728737A CN 108728737 A CN108728737 A CN 108728737A CN 201810346082 A CN201810346082 A CN 201810346082A CN 108728737 A CN108728737 A CN 108728737A
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China
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cold
steel sheet
rolled steel
production method
rolling
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CN201810346082.3A
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Chinese (zh)
Inventor
汤亨强
张宜
赵云龙
朱伦才
舒宏富
汪建威
贾幼庆
熊华报
王占业
李进
吴浩
俞波
毛鸣
唐东东
高光泽
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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Priority to CN201810346082.3A priority Critical patent/CN108728737A/en
Publication of CN108728737A publication Critical patent/CN108728737A/en
Pending legal-status Critical Current

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    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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 kind of Ultra-low carbon battery case cold-rolled steel sheet and production methods.The cold-rolled steel sheet includes following chemical composition and weight percent：C：0.002%~0.006%, Si≤0.030%, Mn：0.30%~0.40%, P≤0.018%, S≤0.012%, Ti：0.035%~0.055%, Als：0.030%~0.060%, [N]≤0.004%, [O]≤0.004%, remaining is Fe and inevitable impurity.Its production method includes the following steps：→ pickling → cold rolling → continuous annealing → smooth → finished product is batched in molten iron smelting → sheet billet continuous casting → scafing → soaking pit soaking → hot continuous rolling controlled rolling and controlled cooling →.By the cold-rolled steel sheet that the method for the present invention produces, tissue topography is ferrite, and grain size number is 9 grades；Its yield strength is 180MPa~240MPa, and tensile strength is 300MPa~390MPa, A50>=33%, r value >=1.3, n value >=0.18.The steel plate has excellent punching performance, surface quality, corrosion resistance and good plating resistance.

Description

A kind of Ultra-low carbon battery case cold-rolled steel sheet and production method
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of Ultra-low carbon battery case cold-rolled steel sheet and production Method.
Background technology
With the development and progress of country, the living standard of the people is continuously improved, energy storage type number business men product, smart home Equal products progress into huge numbers of families, especially country and vigorously support the popularization and application of new-energy automobile, and steel accumulator is made For the key component of household electrical appliance and new-energy automobile, its demand increases year by year, and market potential is huge.Steel battery case is not to It is only high to Molten Steel Cleanliness requirement, and require it with good high speed stamping performance and coating performance, it is provided simultaneously with certain Corrosion resistance, it is stamping after battery-shell surface the defects of forbidding cracking, trachoma, corrugation, pit.
Battery case steel has two kinds of component systems of aluminum killed steel and IF steel, the logical volume of existing aluminum killed steel currently on the market Energy fluctuation is larger, and punching performance is poor, and it is higher that precious metals element, the costs such as addition Nb are generally selected in existing IF steel.
Invention content
In order to solve the above technical problems, the present invention provides a kind of Ultra-low carbon battery case cold-rolled steel sheet and producers Method.By accurately controlling the ingredient in steel, and pass through hot rolling, pickling, the complete six rollers cold continuous rolling of five racks and continuous annealing, smooth work Sequence produces low-carbon deep-draw battery case cold-rolled steel sheet.The steel plate have excellent punching performance, surface quality, corrosion resistance with And it is good plating resistance.
The technical solution that the present invention takes is：
A kind of Ultra-low carbon battery case cold-rolled steel sheet, the cold-rolled steel sheet include following chemical composition and weight percent Than：C：0.002%~0.006%, Si≤0.030%, Mn：0.30%~0.40%, P≤0.018%, S≤0.012%, Ti： 0.035%~0.055%, Als：0.030%~0.060%, [N]≤0.004%, [O]≤0.004%, remaining is for Fe and not Evitable impurity.
Steel grade alloys producing is based primarily upon following principle in the present invention：
1) carbon (C)：With the reduction of C element, armor plate strength declines, and elongation percentage, n values and r values improve, the deep drawing quality of steel plate It can be gradually increased.Therefore Ultra-low carbon is to produce the precondition of battery case steel, while micro C element helps to improve the strong of steel Degree, ensures that battery case is unlikely to deform.Therefore the present invention uses Ultra-low carbon composition design, controls C：0.002%~0.006%.
2) silicon (Si)：Si too high levels, surface of steel plate iron scale are not easy to remove, and surface is easy to be formed due to oxide pressure The micro-crack entered, during steel band high speed deep-draw, micro-crack can be used as crackle original and steel plate caused to crack.In addition Si elements Too high levels influence steel plate plating performance, therefore Si≤0.030% in the present invention.
3) manganese (Mn)：Mn can reduce austenite → ferritic phase transition temperature and (can make up because the reduction of C element content is brought Austenite → ferritic phase transition temperature increase), expand hot processing temperature range, be conducive to fining ferrite grains size； But Mn too high levels, it is all unfavorable to plasticity, punching performance, fatigue behaviour, consider, Mn percentage compositions control model in the present invention Enclose is 0.30%~0.40%.
4) phosphorus (P)：Diffusion velocities of the P in γ-Fe and α-Fe is small, segregation is easily formed, to steel formability performance and welding Performance is unfavorable, therefore reduces P content in steelmaking process as possible and ensure P≤0.018%.
5) sulphur (S)：S elements are harmful elements in battery case steel, and steel is made to generate red brittleness, reduce the ductility of steel and tough Property, easily cause crackle in rolling.In addition S is also unfavorable to welding performance, and reduces corrosion resistance.Therefore the present invention is as possible by steel Middle S contents control is in the ranges of S≤0.012%.
6) aluminium (Al)：Al is as main deoxidier, while aluminium also has certain effect to crystal grain thinning.The shortcomings that aluminium is to influence Hot-working character, the welding performance and cutting performance of steel.The present invention controls Al percentage compositions 0.030%~ In 0.060% range.
7) titanium (Ti)：Ti elements are strong carbide, sulfide and nitride forming elements, such compound is at high temperature It is not readily dissolved in austenite, plays obstruction Austenite Grain Growth, crystal grain thinning improves the effect of the deep drawability of steel plate.But the Two-phase precipitate excessively also influences whether the deep drawability of steel plate, thus the present invention by the Ti control of element of steel grade 0.035% In~0.055% range.
8) nitrogen (N)：N element easily forms TiN in steel with Ti, and N element is excessively high to cause trace Ti element disabler.Cause This present invention is by N content control in [N]≤0.004% range.
9) oxygen (O)：O elements easily form alumina inclusion in steel with Al, and field trash influences whether rushing for battery case steel Performance is pressed, stamping cracking, trachoma quantity is caused to increase.Therefore present invention control [O]≤0.004%.
Further, the cold-rolled steel sheet preferably comprises following chemical composition and weight percent：C：0.0025%~ 0.0032%, Si≤0.020%, Mn：0.33%~0.35%, P≤0.015%, S≤0.006%, Ti：0.038%~ 0.042%, Als：0.033%~0.036%, [N]≤0.0020%, [O]≤0.0018%, remaining is for Fe and inevitably Impurity.
Further, the cold-rolled steel sheet preferably comprises following chemical composition and weight percent：C：0.0036%~ 0.0055%, Si≤0.020%, Mn：0.36%~0.38%, P≤0.015%, S≤0.006%, Ti：0.048%~ 0.053%, Als：0.038%~0.053%, [N]≤0.002%, [O]≤0.0018%, remaining is for Fe and inevitably Impurity.
The present invention also provides the production method of the Ultra-low carbon battery case cold-rolled steel sheet, the production method includes Following steps：→ pickling is batched in molten iron smelting → sheet billet continuous casting → scafing → soaking pit soaking → hot continuous rolling controlled rolling and controlled cooling → → cold rolling → continuous annealing → smooth → finished product.
In the molten iron smelting step, measure of skimming with after of skimming before taking adjusts [S] constituent content, can reduce steel Harmful element in water；Self-loopa steel scrap is added in the decarburization prometaphase, carries out ladle top slag modification, which helps to reduce molten steel In impurity element.
In the hot continuous rolling controlled rolling and controlled cooling step, hot rolling heating temperature is 1210 DEG C~1250 DEG C, can ensure that steel billet fills Austenitizing, compound is divided fully to dissolve；For finishing temperature control at 880 DEG C~920 DEG C, which can ensure finishing temperature control System avoids the occurrence of mixed crystal phenomenon caused by two-phase section rolling in austenite temperatures above；Hot rolling Crown control is 0~40 μm, wedge Shape control is -20 μm~20 μm, can be effectively improved final finished featheredge situation；Section cooling is used after hot rolling.
Described to batch in step, at 660 DEG C~720 DEG C, which helps to refine hot rolled coil oiler temperature control Crystal grain.
In the cold rolling step, 75%~85%, big reduction ratio can improve brilliant in steel the control of cold rolling total reduction Grain distortion energy, reduces recrystallization temperature, is conducive to crystal grain thinning, improves the deep drawability of steel plate.
In the continuous annealing step, at 770 DEG C~790 DEG C, annealing time is 60s~180s, should for soaking temperature control Temperature and time can ensure that recrystallization is complete, and excessively high annealing temperature and long annealing time can reduce productivity effect, Make coarse grains, reduces the deep drawability of steel plate.
In the planarization step, smooth elongation control uses Ra for 2.0 μm of leveling roll 0.6~2.0%, Guarantee plate face roughness is 0.5 μm≤Ra≤1.0 μm, and battery-shell surface is bright and clean after which is conducive to plating.
The present invention is and to pass through hot rolling, pickling, the complete six rollers cold continuous rolling of five racks and company by accurately controlling the ingredient in steel Continuous annealing, smooth process produce low-carbon deep-draw battery case cold-rolled steel sheet.By the cold-rolled steel sheet that the method for the present invention produces, group It is ferrite to knit pattern, and grain size number is 9 grades；Its yield strength be 180MPa~240MPa, tensile strength be 300MPa~ 390MPa, A50>=33%, r value >=1.3, n value >=0.18.The steel plate has excellent punching performance, surface quality, corrosion resistance And it is good plating resistance.
Description of the drawings
Fig. 1 is 200 times of metallographic structure figures of the Ultra-low carbon battery case cold-rolled steel sheet in embodiment 1；
Fig. 2 is 200 times of metallographic structure figures of the Ultra-low carbon battery case cold-rolled steel sheet in embodiment 2.
Specific implementation mode
Invention is described in detail with reference to embodiment.
A kind of Ultra-low carbon battery case cold-rolled steel sheet, the chemical composition such as table 1 of the molten steel in each embodiment and comparative example It is shown.The production technology of embodiment 1,2 and comparative example 1 is：Molten iron smelting → sheet billet continuous casting → scafing → soaking pit soaking → hot continuous rolling controlled rolling and controlled cooling → batches → pickling → cold rolling → continuous annealing → smooth → finished product；The production technology of comparative example 2 is： Molten iron smelting → sheet billet continuous casting → soaking pit soaking → hot continuous rolling controlled rolling and controlled cooling → batches → and pickling → cold rolling → continuous annealing → Smooth → finished product.
1 chemical composition of table, wt%
Classification C Si Mn P S Als Ti N
Embodiment 1 0.0025 ≤0.0200 0.330 ≤0.0120 0.0060 0.0450 0.0520 0.0017
Embodiment 2 0.0055 ≤0.0200 0.350 ≤0.0150 0.0040 0.0350 0.0500 0.0015
Comparative example 1 0.0210 ≤0.0200 0.180 ≤0.0110 0.0030 0.0530 0.0130 0.0017
Comparative example 2 0.0023 ≤0.0200 0.2300 ≤0.0130 0.0380 0.0240 0.0750 0.0035
All strands carry out trial-production processing according to 2 technique of table, and finished product thickness specification is 0.5mm.
2 production technology of table
Final finished mechanical properties value is shown in Table 3.
3 mechanical property of table
Classification Direction Rp0.2/MPa Rm/MPa A50/ % N values R values
Embodiment 1 0° 191 315 48 0.22 1.92
Embodiment 2 0° 221 346 45 0.23 1.80
Comparative example 1 0° 209 326 38 0.21 1.44
Comparative example 2 0° 214 295 41 0.20 1.63
From the above, it is seen that the steel plate that the present invention is produced, thickness specification is 0.5mm, yield strength 180MPa~240MPa, tensile strength are 300MPa~390MPa, A50>=33%, r value >=1.3, n value >=0.18.Although comparison It is suitable with embodiment 1,2 in terms of example 1,2 intensity, but r values are relatively low, punching performance is poor.
Battery shell product is rushed with embodiment and comparative example examination respectively, embodiment 1,2 can meet 30/minute, punching press 10000 ratio of defects are 0.089%, and major defect is pit；1 drawing velocity of comparative example reaches 30/minute, stamping defect Rate is 0.403%, and major defect is wire drawing；2 drawing velocity of comparative example reaches 30/minute, and stamping defect rate is 0.614%, Major defect is trachoma.To sum up, embodiment 1,2 punching press qualification rates are high compared with comparative example 1,2 qualification rates.
A kind of above-mentioned detailed description that Ultra-low carbon battery case cold-rolled steel sheet and production method are carried out with reference to embodiment, It is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from this hair Change and modification under bright general plotting should belong within protection scope of the present invention.

Claims (10)

1. a kind of Ultra-low carbon battery case cold-rolled steel sheet, which is characterized in that the cold-rolled steel sheet include following chemical composition and Weight percent：C：0.002%~0.006%, Si≤0.030%, Mn：0.30%~0.40%, P≤0.018%, S≤ 0.012%, Ti：0.035%~0.055%, Als：0.030%~0.060%, [N]≤0.004%, [O]≤0.004%, Remaining is Fe and inevitable impurity.
2. Ultra-low carbon battery case cold-rolled steel sheet according to claim 1, which is characterized in that the cold-rolled steel sheet includes Following chemical composition and weight percent：C：0.0025%~0.0032%, Si≤0.020%, Mn：0.33%~0.35%, P ≤ 0.015%, S≤0.006%, Ti：0.038%~0.042%, Als：0.033%~0.036%, [N]≤0.0020%, [O]≤0.0018%, remaining is Fe and inevitable impurity.
3. Ultra-low carbon battery case cold-rolled steel sheet according to claim 1, which is characterized in that the cold-rolled steel sheet includes Following chemical composition and weight percent：C：0.0036%~0.0055%, Si≤0.020%, Mn：0.36%~0.38%, P ≤ 0.015%, S≤0.006%, Ti：0.048%~0.053%, Als：0.038%~0.053%, [N]≤0.002%, [O]≤0.0018%, remaining is Fe and inevitable impurity.
4. the production method of the Ultra-low carbon battery case cold-rolled steel sheet according to claim 1-3 any one, feature It is, the production method includes the following steps：Molten iron smelting → sheet billet continuous casting → scafing → soaking pit soaking → heat is even Roll controlled rolling and controlled cooling → batch → pickling → cold rolling → continuous annealing → smooth → finished product.
5. production method according to claim 4, which is characterized in that in the molten iron smelting step, skim before taking and After skim measure, adjust [S] constituent content；Self-loopa steel scrap is added in the decarburization prometaphase, carries out ladle top slag modification.
6. production method according to claim 4, which is characterized in that in the hot continuous rolling controlled rolling and controlled cooling step, hot rolling adds Hot temperature is 1210 DEG C~1250 DEG C, and finishing temperature control is at 880 DEG C~920 DEG C, and hot rolling Crown control is 0~40 μm, wedge shape Control is -20 μm~20 μm；Hot rolling uses section cooling.
7. production method according to claim 4, which is characterized in that described to batch in step, oiler temperature control is 660 DEG C~720 DEG C.
8. production method according to claim 4, which is characterized in that in the cold rolling step, the control of cold rolling total reduction 75%~85%.
9. production method according to claim 4, which is characterized in that in the continuous annealing step, soaking temperature control At 770 DEG C~790 DEG C, annealing time is 60s~180s.
10. production method according to claim 4, which is characterized in that in the planarization step, smooth elongation control exists 0.6~2.0%, and use Ra for 2.0 μm of leveling roll, guarantee plate face roughness is 0.5 μm≤Ra≤1.0 μm.
CN201810346082.3A 2018-04-18 2018-04-18 A kind of Ultra-low carbon battery case cold-rolled steel sheet and production method Pending CN108728737A (en)

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CN110106449A (en) * 2019-05-31 2019-08-09 张家港扬子江冷轧板有限公司 Battery case cold rolling thin steel strip and its production method
CN114381589A (en) * 2021-11-26 2022-04-22 安阳钢铁股份有限公司 Preparation method of environment-friendly and economical steel for goods shelves
CN114921724A (en) * 2022-05-20 2022-08-19 武汉钢铁有限公司 Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof
CN115558855A (en) * 2022-09-29 2023-01-03 马鞍山钢铁股份有限公司 Cold-rolled sheet for battery shell adopting cover annealing and production method thereof
CN116287946A (en) * 2023-05-22 2023-06-23 江苏省沙钢钢铁研究院有限公司 Production method of steel belt for battery shell

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110106449A (en) * 2019-05-31 2019-08-09 张家港扬子江冷轧板有限公司 Battery case cold rolling thin steel strip and its production method
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CN114921724A (en) * 2022-05-20 2022-08-19 武汉钢铁有限公司 Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof
CN115558855A (en) * 2022-09-29 2023-01-03 马鞍山钢铁股份有限公司 Cold-rolled sheet for battery shell adopting cover annealing and production method thereof
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CN116287946A (en) * 2023-05-22 2023-06-23 江苏省沙钢钢铁研究院有限公司 Production method of steel belt for battery shell
CN116287946B (en) * 2023-05-22 2023-08-04 江苏省沙钢钢铁研究院有限公司 Production method of steel belt for battery shell

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Application publication date: 20181102