High-strength high-tensile ratio cold-rolled steel sheet and manufacturing method thereof

A high-yield ratio, cold-rolled steel plate technology, applied in cold-rolled steel plate, high-strength high-yield ratio cold-rolled steel plate and its manufacturing field, can solve cost and stability bottlenecks, unfavorable strength stability, and insignificant strengthening effect and other issues, to achieve the effect of saving alloy elements, reducing environmental impact, and high yield ratio

Active Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this strengthening mechanism, if the yield strength of this type of steel reaches more than 500MPa, it is necessary to add a lot of microalloying elements, resulting in a significant increase in cost: for example, when the addition of Nb reaches more than 0.05%, its strengthening effect reaches the plateau area, improving The strengthening effect of the added amount is not obvious; alth...

Method used

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  • High-strength high-tensile ratio cold-rolled steel sheet and manufacturing method thereof
  • High-strength high-tensile ratio cold-rolled steel sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] After molten steel is smelted and cast according to the chemical composition shown in Table 2, hot rolling is carried out, the final rolling temperature is 830 ° C, the coiling temperature is 500 ° C, cold rolling is carried out after pickling, the cold rolling reduction is 40%, and then The rolled piece is heated to 780°C for annealing, held for 80s, cooled to 400°C at a rate of 20°C / s, then cooled to below 200°C at a rate of 30°C / min, and finally leveled by 0.5%.

Embodiment 2

[0049] The implementation method is the same as in Example 1, wherein the finish rolling temperature is 850°C, the coiling temperature is 530°C, the cold rolling reduction is 45%, annealed at 790°C, kept for 60s, the cooling rate is 30°C / s, and cooled to 420°C °C, and then cooled to below 200 °C at a rate of 40 °C / min, with a flatness rate of 0.6%.

Embodiment 3

[0051] The implementation method is the same as in Example 1, wherein the final rolling temperature is 860°C, the coiling temperature is 550°C, the cold rolling reduction is 50%, annealed at 800°C, kept for 100s, the cooling rate is 25°C / s, and cooled to 440°C °C, and then cooled to below 200 °C at a rate of 35 °C / min, with a flatness rate of 0.7%.

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Abstract

The invention provides a high-strength and high-yield ratio cold-rolled steel sheet and a manufacturing method thereof. The high-strength and high-yield ratio cold-rolled steel sheet comprises the following chemical components by the weight percentage: C: 0.08 percent to 0.14 percent, Si: 0.4 percent to 1.0 percent, Mn: 1.2 percent to 2.0 percent, P: less than or equal to 0.03 percent, S: less than or equal to 0.02 percent, N: less than or equal to 0.008 percent, Al: 0.02 percent to 0.06 percent, Nb: 0.01 percent to 0.03 percent, and the rest are Fe and inevitable impurities. The high-strength and high-yield ratio cold-rolled steel sheet is manufactured through processes, such as final rolling at normal temperature, coiling at low temperature, heating and heat preservation at quite high temperature, quick cooling and the like. The yield strength of the cold-rolled steel sheet is more than or equal to 500Mpa, the tensile strength is more than or equal to 600Mpa and the yield ratio is more than or equal to 0.80; therefore, the steel sheet can meet the requirements of the automobile manufacturing industry for high-yield ratio steel sheets with higher strength.

Description

technical field [0001] The invention relates to the field of steel products, in particular to cold-rolled steel plates, and more particularly to a high-strength, high-yield ratio cold-rolled steel plate and a manufacturing method thereof. Background technique [0002] The automotive industry requires the use of high-strength steel plates to improve safety performance, reduce weight and save energy. For example, the structure of an automobile body is critical to protecting the safety of occupants, and a large number of high-strength steel plates are required. Generally, the forming of automotive structural parts is relatively simple, and the requirements for steel formability are not particularly high. However, due to the small amount of deformation and low degree of work hardening, the requirements for the original strength of the steel plate are high, otherwise it is difficult to ensure that the body has sufficient strength. Therefore, cold-rolled steel sheets for automotiv...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C21D8/02C21D1/26B21B37/00
Inventor 朱晓东李旭飞
Owner BAOSHAN IRON & STEEL CO LTD
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