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A kind of steel for high-hardness tin-plated original plate and its manufacturing method

A high-hardness, tin-plated technology, applied in the direction of temperature control, elongation control, etc., can solve the problems of high secondary cold rolling deformation rate, poor surface quality, high production cost, etc., and achieve excellent quality, low production cost and uniformity Good results

Inactive Publication Date: 2011-12-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above existing technologies all produce high-hardness tin-plated raw plates through secondary cold rolling after annealing in a bell furnace. Among the material components, C: 0.05-0.13%, Mn: 0.49-0.60%, and the remaining components are as much as possible. Less, using its composition process to produce higher hardness tin-plated raw plate products, due to high carbon and large secondary cold rolling deformation rate, the product has welding and other processability, performance uniformity, poor surface quality, and high production costs, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Smelting and continuous casting are carried out according to the composition in Table 1 to make slabs, followed by hot rolling, heated to 1200°C for hot rolling, and the final rolling temperature of hot rolling is 860°C; coiled at 570°C.

[0037] Carry out a cold rolling, the deformation rate is 88%;

[0038]After one cold rolling, annealing is carried out at 640°C, and the annealing time is 110 seconds;

[0039] Secondary cold rolling is carried out again, the deformation rate is controlled at 25%, and secondary cold rolled sheet is obtained. After testing, its hardness HR30T is 73.

[0040] The obtained secondary cold-rolled steel plate is tinned, the tinned plate is bent into a 52mm cylindrical tank body and then welded, and then flanged at the end of the tank body. As a result, the welded part does not crack after flanging, which can be considered The material in this embodiment has good weldability.

Embodiment 2

[0042] Smelting and continuous casting are carried out according to the composition in Table 1 to make slabs, followed by hot rolling, heated to 1220°C for hot rolling, and the final rolling temperature of hot rolling is 900°C; coiled at 550°C.

[0043] Carry out a cold rolling, the deformation rate is 89%;

[0044] After the first cold rolling, annealing is carried out at 620°C, and the annealing time is 96 seconds;

[0045] Then carry out secondary cold rolling, and the deformation rate is controlled at 28%, and the obtained secondary cold rolling plate is obtained. After testing, its hardness HR30T is 80.

[0046] The obtained secondary cold-rolled steel plate is tinned, the tinned plate is bent into a 52mm cylindrical tank body and then welded, and then flanged at the end of the tank body. As a result, the welded part does not crack after flanging, which can be considered The material in this embodiment has good weldability.

Embodiment 3

[0048] According to the composition in Table 1, slabs were smelted and continuously cast, followed by hot rolling, heated to 1200°C for hot rolling, and the final rolling temperature of hot rolling was 880°C; coiled at 560°C.

[0049] Carry out a cold rolling, the deformation rate is 83%;

[0050] After the first cold rolling, annealing is carried out at 600°C, and the annealing time is 62 seconds;

[0051] Then carry out secondary cold rolling, and the deformation rate is controlled at 22%, and the obtained secondary cold rolling plate is obtained. After testing, its hardness HR30T is 76.

[0052] The obtained secondary cold-rolled steel plate is tinned, the tinned plate is bent into a 52mm cylindrical tank body and then welded, and then flanged at the end of the tank body. As a result, the welded part does not crack after flanging, which can be considered The material in this embodiment has good weldability.

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Abstract

The invention relates to a high-hardness tin-plated original steel produced by secondary cold rolling. S≤0.015%, Al: 0.01-0.05%, N: 0.0080-0.0160%, and the rest are iron and unavoidable impurities. The manufacturing method of the steel for high-strength tin-plated raw plate includes: smelting the above-mentioned components and continuously casting them into billets; heating the billets to 1150-1250°C for hot rolling, and the final rolling temperature is above Ar3; coiling, coiling The temperature is ≤580°C; the first cold rolling, the deformation is controlled at 80-90%; the annealing is performed after the first cold rolling, the annealing temperature is 580-650°C, and the annealing time is 40-120 seconds; the second cold rolling, the deformation is controlled Between 15% and 28%. The steel plate for high-strength tin-plated original plate of the present invention has a hardness of HR30T 70-80, and has excellent weldability and processability. Suitable for use such as making three-piece cans.

Description

technical field [0001] The invention relates to a manufacturing method of a high-hardness tin-plating raw plate produced by secondary cold rolling, in particular to a steel for tin-plating raw plate used for making three-piece cans with welding requirements and a manufacturing method thereof. Background technique [0002] Secondary cold-rolled materials are widely used in can bodies and lids in food, chemical and other packaging industries. The secondary cold-rolled product developed in recent years has become the first choice for steel can manufacturers to reduce costs and ensure quality due to its high strength, extremely thin thickness, and certain processing properties. However, three-piece cans and other uses It is generally required that the welding quality be high, and it is required that the tank body does not crack after welding, flanging, diameter expansion and other processing. [0003] The prior art has introduced the high-hardness tin-plated original plate of t...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02B21B37/74B21B37/56
Inventor 班必俊
Owner BAOSHAN IRON & STEEL CO LTD
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