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High strength cold rolled steel plate

A cold-rolled steel plate, high-strength technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of reduced ductility, delayed fracture, etc., and achieve the effects of excellent delayed fracture resistance and excellent chemical conversion treatment

Active Publication Date: 2020-07-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the strength of the steel sheet is increased, the ductility will decrease, and it may cause delayed fracture due to hydrogen intruded from the use environment

Method used

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  • High strength cold rolled steel plate
  • High strength cold rolled steel plate
  • High strength cold rolled steel plate

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Embodiment Construction

[0028] Embodiments of the present invention will be described below. In addition, "%" which shows content of a component element means "mass %" unless otherwise specified. First, the component composition of the cold-rolled steel sheet will be described.

[0029] C: 0.10% to 0.50%

[0030] C is an element effective in improving the strength-ductility balance of the steel sheet. When the C content is less than 0.10%, it is difficult to secure a tensile strength of 1180 MPa or more. On the other hand, if the C content exceeds 0.50%, coarse cementite is precipitated, and hydrogen cracking occurs starting from the coarse cementite. Therefore, the C content is in the range of 0.10% to 0.50%. The lower limit is preferably 0.12% or more. The upper limit is preferably in the range of 0.30% or less.

[0031] Si: 1.0% to 3.0%

[0032] Si is an element effective in securing the strength without reducing the ductility of the steel sheet so much. When the Si content is less than 1....

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Abstract

The present invention provides a high-strength cold-rolled steel sheet having a tensile strength of 1180 MPa or more and excellent delayed fracture resistance and chemical conversion treatability. The high-strength cold-rolled steel sheet has the following composition, that is, by mass %, it contains C: 0.10% to 0.50%, Si: 1.0% to 3.0%, Mn: 1.0% to 2.5%, P: less than 0.05%, S : 0.02% or less, Al: 0.01% to 1.5%, N: 0.005% or less, Cu: 0.05% to 0.50%, the remainder is composed of Fe and unavoidable impurities, and the surface coverage of the steel sheet is an oxide mainly composed of Si 1% or less, the steel sheet surface coverage of Fe-based oxides is 40% or less, Cu S / Cu B It is 4.0 or less, and the tensile strength is 1180 MPa or more. It should be noted that the above Cu S is the Cu content of the surface layer of the steel plate, the above Cu B is the Cu content of the base metal.

Description

technical field [0001] The invention relates to a high-strength cold-rolled steel plate. It further relates to a high-strength cold-rolled steel sheet having a tensile strength of 1180 MPa or more, excellent delayed fracture resistance, and chemical conversion treatability. Background technique [0002] In recent years, to CO 2 Against the background of emission reduction and crash safety demands, the lightweight and high-strength of automobile bodies are constantly being carried out. Currently, the tensile strength of these automotive steel sheets is 980 MPa class, which is the mainstream, but the demand for higher strength of the steel sheet is increasing, and the development of high-strength steel sheets with a tensile strength of 1180 MPa or more is required. However, if the strength of the steel sheet is increased, the ductility will decrease, and there is a possibility of delayed fracture due to hydrogen intruded from the use environment. [0003] In addition, steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/16C22C38/60C21D9/46
CPCC21D8/0236C21D8/0278C21D9/46C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C22C38/20C22C38/38C22C38/60C23G1/00C23G1/08C23G1/081C21D6/002C21D6/005C21D6/007C21D6/008C21D8/0205
Inventor 吉冈真平小野义彦増冈弘之
Owner JFE STEEL CORP
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