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Secondary cold rolled steel and production method thereof

A manufacturing method and secondary cold rolling technology, applied in the field of metallurgy, can solve problems such as low production cost, and achieve the effects of low production cost, good bake hardening performance and processing performance, and high strength

Inactive Publication Date: 2013-04-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a method for manufacturing secondary cold-rolled steel, which can improve the bake-hardening performance of the steel material after coating through a reasonable process design, which solves the problem of high-strength thinning steel. Production manufacturing issues, low production cost and stable production quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A-D and comparative example E-F

[0037] Make the secondary cold-rolled steel of the present invention according to the following steps:

[0038] (1) Converter smelting, control the proportion of each chemical element as shown in Table 1;

[0039] (2) Post-furnace refining;

[0040] (3) Hot rolling: the slab is heated to ≥1180°C, and the final rolling temperature is ≥Ar 3 Temperature, coiling temperature ≤ 600 ℃;

[0041] (4) Pickling;

[0042] (5) Cold rolling: the reduction rate of cold rolling is 50-90%;

[0043] (6) Continuous annealing: the annealing temperature is 600-700°C;

[0044] (7) Secondary cold rolling: The secondary cold rolling rate is 5 to 25%.

[0045] (8) Finishing into finished rolls.

[0046]Table 1 The mass percentage distribution (wt.%) of each component of the secondary cold-rolled steel in Examples A-D and Comparative Examples E-F

[0047] name

C

mn

P

S

Al

N

Example A

0.010

0.8

0.011

0.005

0.028

0.0055

Exampl...

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Abstract

The invention discloses a secondary cold rolled steel which comprises the following chemical elements in percentage by mass: 0.005 to 0.015 percent of C, 0.50 to 1.00 percent of Mn, 0.01 to 0.04 percent of Al, 0.004 to 0.0100 percent of N and the balance of Fe and other inevitable impurities. Correspondingly, the invention further discloses a production method for the secondary cold rolled steel. The secondary cold rolled steel, disclosed by the invention, has higher strength, higher hardness and smaller thickness, and also has excellent bake hardening performance and processability.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a steel grade and a manufacturing method thereof. Background technique [0002] In order to save costs, more and more industries require to reduce the thickness of steel materials in practical applications. For example, steel materials used for packaging in food, chemical and other industries need to reduce the thickness. However, the reduction in the thickness of the steel material cannot affect the performance of the user. Therefore, the current industry requirements for the steel material are: while the material is thinned, the strength of the material should also be increased. That is to say, in order to ensure the bearing capacity of the product, in It is necessary to increase the material strength value while reducing the material thickness. [0003] Secondary cold-rolled products have the characteristics of high strength and thinner thickness. It plays a decisive role in reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/00
Inventor 班必俊潘亮
Owner BAOSHAN IRON & STEEL CO LTD
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