Corrosion-resistant steel with impact molding rate not smaller than 150 per minute for cell shell and preparation method thereof

A corrosion-resistant, per-minute technology, which is applied in the field of rapid stamping and forming of steel for battery shells and its preparation, can solve problems such as poor aging resistance, many inclusions, and reduced deep drawing performance, and achieve good shape fixity and mechanical strength of the barrel body. Stable performance and the effect of preventing nitrogen increase

Inactive Publication Date: 2013-11-06
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] Before the present invention, there was an authorized announcement number CN1174109C "Extremely Thin Steel Strip for Battery Shell and Its Manufacturing Method". This patent uses ultra-low carbon Ti-Nb-IF steel to produce battery shell steel. Converting, RH vacuum treatment, continuous casting, hot rolling, coiling, pickling, cold rolling, continuous annealing, slitting and oiling packaging, in order to achieve interstitial atom (IF) state, adopt Ti, Nb compound addition treatment to fix C and N interstitial atoms make C and Nb combine to form NbC, and N and Ti combine to form TiN; however, Al in steel participates in the fixation of N interstitial atoms, and Ti alloy is added more, which is not easy to control, and the production cost is high. The opposite sex (Δr value) is large, and the excessive Ti and Nb content will adversely affect the deep drawing performance of the finished steel plate. At the same time, this patent does not have a smoothing process, which cannot eliminate or reduce the slight surface defects caused by the previous process. The roughness and plate shape required by users cannot be precisely controlled, and it is difficult to improve the adhesion of the battery shell plating
The authorized announcement number is CNl00560770C "Steel for battery case with excellent planar isotropy and its manufacturing method". The patent uses aluminum-killed steel to produce battery case steel. , pickling, cold rolling, bell furnace annealing, finishing into finished coils; but the carbon content is high, C exists in the form of interstitial atoms and cementite in the material, the plasticity becomes poor, and a large amount of infiltration will occur. The carbon body is precipitated at the grain boundary, and there are many inclusions. It is easy to crack during stamping, which reduces the deep drawing performance, affects the appearance quality and use of the battery case, and the production efficiency is low. At the same time, there are interstitial atoms C in the material, and the aging resistance is also low. Difference

Method used

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  • Corrosion-resistant steel with impact molding rate not smaller than 150 per minute for cell shell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Corrosion-resistant steel for battery shells with a speed of ≥ 150 per minute, its composition and weight percentage are: C: 0.0001%, Mn: 0.10%, Al: 0.010%, N: 0.0040%, Nb: 0.030%, and control : P: 0.020%, S: 0.014%, Cu: 0.04%, Ni: 0.05%, Cr: 0.07%, Mo: 0.04%, Si: 0.018%, and the rest are Fe and unavoidable impurities.

[0036] A method for preparing steel for corrosion-resistant battery shells with a punching speed ≥ 150 per minute, the steps of which are as follows:

[0037] 1) According to the process of pure steel smelting and continuous casting into billets;

[0038] 2) Heating the continuous casting slab to 1170-1180°C;

[0039] 3) Carry out rough rolling, and control the exit temperature of rough rolling at 1060-1070°C;

[0040] 4) Fine rolling is carried out in the single-phase austenite zone, and the final rolling temperature is controlled at 900-910°C, and the cumulative reduction rate is 90%;

[0041] 5) Carry out coiling, and the coiling temperature is co...

Embodiment 2

[0048]Corrosion-resistant steel for battery shells with a speed of ≥ 150 per minute, its composition and weight percentage are: C: 0.0005%, Mn: 0.12%, Al: 0.022%, N: 0.0001%, Nb: 0.023%, and control : P: 0.019%, S: 0.015%, Cu: 0.03%, Ni: 0.04%, Cr: 0.08%, Mo: 0.05%, Si: 0.017%, and the rest are Fe and unavoidable impurities.

[0049] A method for preparing steel for corrosion-resistant battery shells with a punching speed ≥ 150 per minute, the steps of which are as follows:

[0050] 1) According to the process of pure steel smelting and continuous casting into billets;

[0051] 2) Heating the continuous casting slab to 1190-1200°C;

[0052] 3) Carry out rough rolling, and control the exit temperature of rough rolling at 1075-1085°C;

[0053] 4) Fine rolling is carried out in the single-phase austenite zone, and the final rolling temperature is controlled at 905-915°C, and the cumulative reduction rate is at 90%;

[0054] 5) Carry out coiling, and the coiling temperature is ...

Embodiment 3

[0061] Corrosion-resistant steel for battery shells with a speed of ≥ 150 per minute, its composition and weight percentage are: C: 0.0009%, Mn: 0.20%, Al: 0.050%, N: 0.0010%, Nb: 0.010%, and control : P: 0.018%, S: 0.014%, Cu: 0.05%, Ni: 0.03%, Cr: 0.06%, Mo: 0.03%, Si: 0.020%, and the rest are Fe and unavoidable impurities.

[0062] A method for preparing steel for corrosion-resistant battery shells with a punching speed ≥ 150 per minute, the steps of which are as follows:

[0063] 1) According to the process of pure steel smelting and continuous casting into billets;

[0064] 2) Heating the continuous casting slab to 1195-1205°C;

[0065] 3) Carry out rough rolling, and control the exit temperature of rough rolling at 1080-1090°C;

[0066] 4) Fine rolling is carried out in the single-phase austenite zone, and the final rolling temperature is controlled at 915-925°C, and the cumulative reduction rate is at 95%;

[0067] 5) Carry out coiling, and the coiling temperature is...

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Abstract

The invention relates to steel capable of being subjected to rapid impact molding for a cell shell and a preparation method thereof. The steel comprises the components in percentage by weight: 0.0001-0.0050% of C, 0.10-0.20% of Mn, 0.010-0.050% of Al, 0.0001-0.0040% of N, 0.010-0.030% of Nb, not more than 0.020% of P, not more than 0.015% of S, not more than 0.05% of Cu, not more than 0.05% of Ni, not more than 0.08% of Cr, not more than 0.05% of Mo and not more than 0.020% of Si. The preparation method comprises the steps: smelting according to a pure steel process and carrying out continuous casting to obtain a blank; heating the continuous cast blank; carrying out rough rolling; carrying out finish rolling in a single-phase austenite region; coiling; pickling; carrying out cold rolling; degreasing; annealing in a full-hydrogen bell-type furnace; and leveling for later use. The finished product obtained in the invention has stable mechanical properties, hardness being 90-100, tensile strength being not lower than 300 MPa, elongation percentage being not lower than 36% and yield ratio being not more than 0.6; the impact-molded cell shell is not easy to crack and has good drum body shape fixity; and the finished product has high corrosion resistance.

Description

technical field [0001] The invention relates to steel for battery cases and a preparation method thereof, in particular to steel for rapid stamping and forming for battery cases and a preparation method thereof. Background technique [0002] Dry battery and rechargeable battery shells are mainly made of cold-rolled steel strips punched by a punching machine. The battery shell products must not have defects such as cracks, trachoma, and snowflakes, and require excellent plane isotropy and resistance to internal pressure changes. Steel strips for battery shells The material is required to have high purity, high ductility, high surface quality, low Δr value, and no cracking or snowflake point defects during processing and forming. [0003] Before 1990, all high-energy batteries were imported. After 1990, high-energy battery production lines were successively introduced in China. The cold-rolled steel strips used in battery production plants were mainly imported from Japan and S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C38/26C22C38/12C22C38/16C21D8/00
Inventor 黄先球王岭汤小兰高智平涂元强卫扬帆余海柳长福袁伟何锐刘建容石争鸣
Owner 武钢集团有限公司
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