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High-strength high-plasticity cold-rolled steel plate for automobiles and production method thereof

A cold-rolled steel plate, high plasticity technology, applied in the field of cold-rolled automobile steel manufacturing, can solve the problems of large energy consumption, high smelting cost, large addition amount, etc., and achieves simple chemical composition, simple smelting process control, and low cost. Effect

Active Publication Date: 2015-01-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Among the published patents for cold-rolled high-strength steel sheets, very few have a tensile strength above 980 MPa, and there are generally disadvantages such as low elongation, many types of alloying elements, large amounts of additions, high smelting costs, and great difficulty.
For the new Q-P heat treatment process, theoretically, the steel plate needs to be heated above the Ac3 point, the temperature is higher, and the energy consumption is larger

Method used

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  • High-strength high-plasticity cold-rolled steel plate for automobiles and production method thereof
  • High-strength high-plasticity cold-rolled steel plate for automobiles and production method thereof
  • High-strength high-plasticity cold-rolled steel plate for automobiles and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The chemical components of the examples are shown in Table 1:

[0026] Table 1 Chemical composition (wt%)

[0027] Example

[0028] The rolling process parameters of the embodiment are shown in Table 2:

[0029] Table 2 Rolling process parameters

[0030]

[0031] The continuous annealing process parameters of the embodiment are shown in Table 3:

[0032] Table 3 Continuous annealing process parameters

[0033]

[0034] The mechanical properties of the steel plates of the examples are shown in Table 4:

[0035] Table 4 Mechanical properties of steel plate

[0036] Example

[0037] figure 1 It is a TEM film photo of Example 1, and the structure is ferrite, martensite and retained austenite.

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PUM

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Abstract

The invention discloses a high-strength high-plasticity cold-rolled steel plate for automobiles and a production method thereof. The high-strength high-plasticity cold-rolled steel plate comprises, by weight, 0.25-0.35% of C, 0.8-1.2% of Si, 2.0-2.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.5-1.0% of Al, 0.001-0.002% of B and the balance Fe and unavoidable impurities. The production method comprises smelting, continuous casting, hot rolling, pickling, cold rolling and continuous annealing. A continuous annealing heating temperature is in a range of 800-850 DEG C, thermal insulation time is in a range of 150-180s, a cooling rate is greater than or equal to 50 DEG C / s, a quenching temperature is in a range of 250-280 DEG C, a partition temperature is in a range of 350-400 DEG C, partition time is in a range of 300-600s and after partition, the product is cooled to a room temperature at a cooling rate greater than or equal to 50 DEG C / s.

Description

Technical field [0001] The invention belongs to the field of cold-rolled automobile steel manufacturing, and relates to a high-strength and high-plasticity cold-rolled steel sheet with a tensile strength greater than 980 MPa and an elongation greater than 20% and a production method thereof. Background technique [0002] After more than a century of development, the automobile industry has gradually become a pillar industry of my country's national economy. After entering the 21st century, automotive materials have undergone great changes. From the perspective of the overall development of automotive materials in Europe, the United States, Japan and other countries, due to the requirements of automotive lightweight, the amount of steel is decreasing, powder metals, non-ferrous metals and The amount of plastic is increasing. However, in order to improve car safety, active and passive safety measures must be added, which will increase the weight of the car. The effective means to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
CPCC21D8/0205C21D8/0221C22C38/00C22C38/02C22C38/04C22C38/06
Inventor 王旭刘仁东王科强郭金宇徐荣杰孙建伦林利徐鑫喻振华
Owner ANGANG STEEL CO LTD
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