High-strength cold rolled steel plate and preparing method thereof

A cold-rolled steel plate and slab technology, applied in the field of high-strength cold-rolled steel plate and its preparation, can solve the problems of high cost of cold-rolled steel plate in strength and formability, and achieve the effect of good market prospect

Inactive Publication Date: 2014-08-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • High-strength cold rolled steel plate and preparing method thereof
  • High-strength cold rolled steel plate and preparing method thereof
  • High-strength cold rolled steel plate and preparing method thereof

Examples

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Example Embodiment

[0023] The present invention provides a method for preparing a cold-rolled steel sheet, which comprises the following steps: hot-rolling, coiling, cold-rolling, annealing, skin-passing and drawing-leveling in sequence, wherein after hot-rolling and before coiling, The intermediate slab obtained after hot rolling is cooled to the temperature of coiling, and the cooling rate of the cooling is 10-30°C / s; the temperature of the coiling is 650-729°C; the reduction ratio of the cold rolling is 60-69%; the annealing method is continuous annealing, in the process of annealing, the intermediate slab obtained after cold rolling goes through the heating section, soaking section, primary cooling section, over-aging section and secondary Cooling section, the end temperature of the intermediate slab obtained after 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, 810-860...

Example Embodiment

[0051] Examples 1-3

[0052] This example is used to illustrate the cold-rolled steel sheet of the present invention and its preparation method.

[0053] 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 opening temperature of rough rolling and enters the reversible rough rolling unit. The intermediate billet after rough rolling enters the hot coil box, and the strip head and tail are exchanged, and then finish rolling is carried out. After finishing rolling, it was rapidly cooled to the coiling temperature according to the specified cooling rate, and then sent to the coiler for coiling (the hot rolling process and cooling process were performed according to the conditions in Table 2). The slab is then subjected to cold rolling and annealing treatment ac...

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Abstract

The invention discloses a preparing 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, 0.1-0.5% of Si, 0.8-1.4% of Mn, 0.07-0.15% of P, not more than 0.015% of S, 0.01-0.05% of Ti, 0.02-0.07% of Nb, 0.001-0.002% of B, 0.01-0.08% of Al, and 97.73-99% of Fe, with the balance being unavoidable impurities. The invention also discloses a cold rolled steel plate prepared by the method. According to the prepared steel plate, the ReL is 280-350 MPa, the Rm is not less than 440 MPa, the A80 is not less than 36%, the r90 is not less than 1.7, and the n90 is not less than 0.18. The prepared steel plate has a good market prospect.

Description

technical field [0001] The invention relates to a high-strength cold-rolled steel sheet and a preparation method thereof. Background technique [0002] With the continuous development of the automotive industry, the market's requirements for automotive sheets continue to increase. In order to meet the market's forming requirements for deep drawing, the demand for extra-super deep-drawing cold-rolled steel sheets becomes more and more urgent. [0003] At present, CN101514392A discloses a continuous annealing process for deep-drawing and ultra-deep-drawing steel sheets as a method for preparing extra-super-deep-drawing cold-rolled steel sheets. The process includes: cleaning the steel plate before annealing, then entering a continuous annealing furnace at a speed of 150-350m / min, spraying the surface of the steel plate with nitrogen-hydrogen mixed gas to protect the steel plate and prevent oxidation, and at the same time heating the steel plate to 120-180 ℃; heat the steel pl...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D1/26
Inventor 王敏莉郑之旺梁英张功庭寸海红张林余灿生付佑春于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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