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A kind of cold-rolled steel plate and preparation method thereof

A technology for cold-rolled steel sheets and slabs, applied in the field of cold-rolled steel sheets and their preparation, can solve the problem of high cost of cold-rolled steel sheets with strength and formability

Inactive Publication Date: 2016-01-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the existing cold-rolled steel sheet preparation method that it is difficult to obtain cold-rolled steel sheets with both strength and formability and the defects of high cost, and to provide a method that can obtain high strength and good formability with low cost. Preparation method of cold-rolled steel sheet and cold-rolled steel sheet prepared therefrom

Method used

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  • A kind of cold-rolled steel plate and preparation method thereof
  • A kind of cold-rolled steel plate and preparation method thereof
  • A kind of cold-rolled steel plate and preparation method thereof

Examples

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preparation example Construction

[0024] The preparation method of the cold-rolled steel plate provided by the present invention comprises: hot-rolling, coiling, cold-rolling, annealing, skin-passing and tension-leveling of the slab sequentially, wherein, after hot-rolling and before coiling, the hot-rolled The obtained intermediate slab is cooled to 700-850°C, the cooling rate of the cooling is 76-95°C / s; the coiling temperature is 730-770°C; the reduction rate of the cold rolling is 55-74 %; the annealing method is continuous annealing. In the annealing process, the intermediate slab obtained after cold rolling passes through heating section, soaking section, primary cooling section, overaging section and secondary cooling section successively. The end temperatures of the intermediate slab obtained after the cold rolling in the heating section, the soaking section, the primary cooling section, the overaging section and the secondary cooling section are respectively 740-790°C, 800-870°C, 200-300°C, 250-320°C,...

Embodiment 1-3

[0054] This example is used to illustrate the cold-rolled steel sheet of the present invention and its preparation method.

[0055] The continuous casting slab of the present invention is obtained by smelting in a converter, Ca treatment in an LF furnace, RH decarburization and continuous casting, and its composition is shown in Table 1. The continuous casting slab is heated in the heating furnace to the rough rolling opening temperature and enters the reversible rough rolling unit. After rough rolling, the intermediate slab enters the hot coil box, and the strip head and tail are exchanged, and then the finish rolling is carried out. After finishing rolling, it is rapidly cooled to the final cooling temperature according to the specified cooling rate, and then after a period of online air cooling, coiling is carried out at the coiling temperature (the hot rolling process and the cooling process are carried out according to the conditions in Table 2). Carry out cold rolling an...

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Abstract

The invention discloses a preparation method of a cold rolled steel plate. The method includes: sequentially subjecting a slab to hot rolling, coiling, cold rolling, annealing, finishing and stretch bending and straightening. The slab comprises following components by weight: 0.001-0.006% of C, not more than 0.06% of Si, 0.1-0.5% of Mn, 0.03-0.08% of P, not more than 0.015% of S, 0.01-0.08% of Al, 0.01-0.05% of Ti, 0.03-0.06% of Nb, and 99.14-99.82% of Fe, with the balance being unavoidable impurities. The invention also discloses a cold rolled steel plate prepared by the method. According to the obtained steel plate, the ReL is 170-230 MPa, the Rm is not less than 340 MPa, the A80 is not less than 40%, the average r is not less than 1.8, and the average n is not less than 0.2. The steel plate has a good market prospect.

Description

technical field [0001] The invention relates to a cold-rolled steel plate and a preparation method thereof. Background technique [0002] With the continuous development of the automobile industry, the market's requirements for automobile plates continue to increase. In order to meet the market's deep-drawing forming requirements, the demand for ultra-ultra-deep drawn cold-rolled steel sheets is becoming more and more urgent. [0003] Currently, CN101514392A discloses a continuous annealing process for deep-drawn and ultra-deep-drawn steel sheets as a method for preparing extra-ultra-deep-drawn cold-rolled steel sheets. The process includes: the steel plate is cleaned before annealing, enters the continuous annealing furnace at a speed of 150-350m / min, sprays the surface of the steel plate with nitrogen-hydrogen mixed gas, protects the steel plate and prevents oxidation, and heats the temperature of the steel plate to 120-180 ℃; heat the steel plate again to 750-780 ℃, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D1/26C21D8/02
Inventor 王敏莉郑之旺张林张功庭梁英寸海红余灿生付佑春于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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