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High strength cold rolled steel sheet and method of producing such steel sheet

A cold-rolled steel plate, high-strength technology, applied in the field of high-strength cold-rolled steel plate, high-strength steel plate, can solve problems such as inappropriate

Active Publication Date: 2014-12-24
VOESTALPINE STAHL GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, due to the high annealing temperature, this material is not suitable for production on conventional industrial annealing lines

Method used

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  • High strength cold rolled steel sheet and method of producing such steel sheet
  • High strength cold rolled steel sheet and method of producing such steel sheet
  • High strength cold rolled steel sheet and method of producing such steel sheet

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Experimental program
Comparison scheme
Effect test

Embodiment

[0113] A number of experimental alloys 1-14 were fabricated with chemical compositions according to Table I. Plates were fabricated and subjected to heat treatment in a conventional CA production line according to the parameters specified in Table II. The microstructure and various mechanical properties of the steel sheets were examined and the results are listed in Table III.

[0114] In MA size d MA One column gives the particle size of martensite-austenite particles measured by image analysis, wherein the MA size is divided into three categories:

[0115] ●Small, where MA particle size d MA ≤3μm,

[0116] ●Medium, where 3μmMA <6μm,

[0117] ● large, where d MA ≥6μm.

[0118] In the cementite column, N indicates that the amount of cementite that can be found in the microstructure is almost negligible, while Y indicates that there is a large amount of detrimental cementite in the final microstructure.

[0119] The positive effect of chromium on the microstructure and m...

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PUM

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Abstract

The present invention relates to high strength cold rolled steel sheet suitable for applications in automobiles, construction materials and the like, specifically high strength steel sheet excellent in formability. In particular, the invention relates to cold rolled steel sheets having a tensile strength of at least 980 MPa and a method for producing such steel sheet.

Description

technical field [0001] The present invention relates to a high-strength cold-rolled steel sheet suitable for automobiles, building materials, etc., particularly a high-strength steel sheet excellent in formability. In particular, the present invention relates to cold-rolled steel sheets having a tensile strength of at least 980 MPa. Background technique [0002] Increased strength levels are a prerequisite for lightweight construction for a wide variety of applications, especially in the automotive industry, where fuel consumption can be reduced due to reduced body mass. [0003] Automotive body components are often stamped from sheet steel to form complex sheet structural parts. However, such components cannot be produced from conventional high-strength steels because their ability to form complex structures is too low. For this reason, multiphase transformation-induced plasticity assisted steels (TRIP steels) have gained considerable attention in the past few years. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C38/02C22C38/04C22C38/06
CPCC21D1/20C21D1/26C21D6/004C21D6/005C21D6/008C21D8/0436C21D9/46C21D9/52C21D2211/001C21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/28C22C38/32C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor S.保罗D.克里赞A.皮彻勒中屋道治
Owner VOESTALPINE STAHL GMBH