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Superthin steel strip for battery casing, and producing method thereof

A production method and battery shell technology, which are applied in the fields of ultra-deep-drawing cold-rolled steel strips and high-strength steel strips, can solve the problems of narrowing of the process parameter control window, no prominent strengthening elements, and strict requirements for C content, so as to suppress performance fluctuations. Timeliness, suppression of plane anisotropy, and good surface quality

Inactive Publication Date: 2004-11-03
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of background technologies 2 and 3 are: ①The C content is demanding and must be controlled below 0.003%; ②There are no prominent strengthening elements; ③The tensile strength of the steel strip σ b Low, σ b s / σ b >0.65
Background technology 3 also has the disadvantage of simply adopting Nb treatment to fix C and N interstitial atoms, the performance of strip steel is very sensitive to changes in production environment conditions, and the control window of process parameters is narrowed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Smelting the ultra-thin steel strip for the battery case of the present invention, the chemical composition of the steel is calculated by weight percentage: C 0.003, Si 0.014, Mn 0.24, P 0.016, S 0.0058, N 0.0017, Al 0.026, Ti 0.017, Nb 0.020, the balance is Fe and unavoidable inclusions. After hot rolling, it is coiled at 650°C, and the final thickness of cold rolling is 0.25mm. After continuous annealing with slight tension, it is slitting and packed with oil. The performance of the finished steel strip is σ s =160MPa, σ b =348MPa, δ 50 =40%, Vickers hardness H v =98, surface (average) roughness R a = 0.25 μm. In a battery company punching AA batteries and AA batteries, the strip width specifications are 89mm and 113mm. Under the high-speed stamping speed (138 pieces / minute) specified by the equipment, all the steel coils of various width specifications are used up, and the punched out The battery case has no waste or defective products, and has gone ...

Embodiment 2

[0034] Example 2: Smelting the ultra-thin steel strip for the battery case of the present invention, the chemical composition of the steel is calculated by weight percentage: C 0.004, Si 0.010, Mn 0.26, P 0.011, S 0.0098, N 0.0025, Al 0.04, Ti 0.02, Nb 0.017, the balance is Fe and unavoidable inclusions. The hot-rolling coiling temperature is set at 700°C, and the thickness of the cold-rolled final rolling plate is 0.30mm. After annealing, it is slitting and oiled for packaging. The performance of the finished steel strip is σ s =175MPa, σ b =359MPa, δ 50 =44%, Vickers hardness H v =101, surface (average) roughness R a = 0.31 μm. The No. 5 battery was punched in the battery factory, with a bandwidth specification of 110mm, and the punching speed of the equipment was 60 pieces per minute. The punched battery shells were intact and all qualified.

[0035] The ultra-thin steel strip for battery case and the production method thereof in the present invention have careful and...

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Abstract

A very-thin steel band used for battery shell is prepared through proportionally adding Mn, Nb and Ti, desulfurizing, smelting in converter, RH vacuum treating, conticasting, hot rolling, winding, acid washing, cold rolling, continuous annealing, shearing and coating oil. Its advantages are high strength and elongation percentage, low yield ratio, high precision and low cost.

Description

technical field [0001] The invention relates to an ultra-thin steel strip for battery shells and a production method thereof, in particular to a high-strength, ultra-deep drawn cold-rolled steel strip for making alkaline dry battery shells and a production method thereof, belonging to low-alloy steel manufacturing field. Background technique [0002] Before the present invention, cold-rolled thin strip steel was mostly used in the manufacture and production of parts of automobiles, TV color tubes and dry battery shells. Thin steel strips are used in the manufacture of automobiles, such as the "cold-rolled high-tensile-strength deep-drawn steel sheet for automobiles" applied by KATOT and others of Japan's KAWAKI Steel Company, patent No. JP2978007, which is reinforced by phosphorus and added manganese and silicon to Further improve the strength of the steel plate. But its biggest problem is that the addition of phosphorus will lead to a rapid increase in the secondary britt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/14H01M2/02
CPCY02E60/10
Inventor 罗石念刘本仁钟定忠
Owner 武钢集团有限公司
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