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A kind of high-strength cold-rolled steel sheet and its manufacturing method

A cold-rolled steel sheet and a technology for a manufacturing method, which are applied in the field of metal materials and their manufacturing, can solve the problems of increasing production costs, being unfavorable to environmental protection, and deteriorating delayed cracking performance of high-strength steel sheets, and achieving excellent corrosion resistance, formability, Excellent corrosion resistance, the effect of meeting the requirements of corrosion resistance

Active Publication Date: 2022-07-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be pointed out that in the technical solution disclosed in this patent document, the use of nitric acid / hydrofluoric acid to pickle the steel plate will deteriorate the delayed cracking performance of the high-strength steel plate, which is not conducive to environmental protection and increases the production cost

Method used

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  • A kind of high-strength cold-rolled steel sheet and its manufacturing method
  • A kind of high-strength cold-rolled steel sheet and its manufacturing method
  • A kind of high-strength cold-rolled steel sheet and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1-30 and comparative example 1-2

[0089] Table 1 lists the mass percentages of various chemical elements in the steel grades corresponding to the high-strength cold-rolled steel sheets of Examples 1-30 and the steel sheets of Comparative Examples 1-2.

[0090] Table 1. (wt%, the balance is Fe and other unavoidable impurities other than P, S and N)

[0091]

[0092] The high-strength cold-rolled steel sheets of Examples 1-30 of the present invention and the steel sheets of Comparative Examples 1-2 were prepared by the following steps:

[0093] (1) Smelting and continuous casting;

[0094] (2) Hot rolling: heat the slab to 1180-1300°C, keep the temperature for 60-240min, control the final rolling temperature to be 880-950°C, and control the coiling temperature to be 400-600°C;

[0095] (3) Pickling and cold rolling: pickling and cold rolling are performed after the hot-rolled coil is uncoiled, and the pickling speed is controlled to be 80-200 m / min, and the cold rolling reduction is controlled to be 40%-70%;...

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Abstract

The invention discloses a high-strength cold-rolled steel sheet, which sequentially includes from outside to inside in the thickness direction of the steel sheet: a reduced iron layer, an inner oxide layer (one or more of Si oxides and Si and Mn composite oxides). Dense particles formed by seeds), decarburized layer and matrix. The reduced iron layer does not contain oxides of Si and Mn; the inner oxide layer contains dense particles formed by one or more of Si oxides and Si and Mn composite oxides. The invention discloses a method for manufacturing the high-strength cold-rolled steel sheet, which comprises the steps of: (1) smelting and continuous casting (2) hot rolling (3) pickling and cold rolling (4) continuous annealing: annealing at 800-920° C. 30~200s, and then slowly cooled to 680~750℃ at a cooling rate of 3~10℃ / s to obtain a certain proportion of ferrite; Part of the intenite is transformed into martensite; then it is heated to 360-460°C, kept for 100-500s, and finally cooled to room temperature; the atmosphere in the heating section and the insulation section is made of N 2 +H 2 mixed gas, H 2 The volume percentage content is 0.5‑20%.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to a cold-rolled steel sheet and a manufacturing method thereof. Background technique [0002] With the rapid development of the automobile industry, the industry's requirements for the lightweight of the car body continue to increase, and accordingly, the application ratio of advanced high-strength steel in the car body begins to gradually increase. Advanced high-strength steels not only have the effect of transformation-induced plasticity (TRIP), but also need to have excellent formability while maintaining high strength. This high-strength steel is currently the most comprehensive and competitive lightweight material for car bodies. [0003] While the automobile industry pursues the lightweight of the body, the environmental protection requirements of energy saving and emission reduction in the production process also bring greater challenges to the automobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/60C21D1/26C21D1/76C21D6/00C21D8/02C21D9/00
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/002C22C38/001C22C38/60C21D1/26C21D6/005C21D6/008C21D8/0221C21D9/0081C21D1/76C21D2211/005C21D2211/008C21D2211/001
Inventor 陈孟钟勇金鑫焱李旭飞王利
Owner BAOSHAN IRON & STEEL CO LTD
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