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High-tensile steel sheet, steel sheet joining process and high-strength automotive part

A joining method, a technology for auto parts, applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., which can solve problems such as toughness deterioration, inability to exhibit steel plates, and stable joint strength.

Inactive Publication Date: 2009-11-25
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a disadvantage that when such a high-tensile steel sheet is joined by electric resistance welding, the toughness of the electric resistance welded portion of the steel sheet deteriorates during the rapid heating and chilling steps of the electric resistance welding process, so that the steel sheet may not exhibit sufficient and stable joint strength

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  • High-tensile steel sheet, steel sheet joining process and high-strength automotive part
  • High-tensile steel sheet, steel sheet joining process and high-strength automotive part
  • High-tensile steel sheet, steel sheet joining process and high-strength automotive part

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Embodiment Construction

[0015] Next, the high tensile steel sheet according to the present invention will be described in detail. In the following description, all percentages refer to mass percentages unless otherwise specified.

[0016] The high-tensile steel sheet of the present invention contains 0.15 to 0.25% of C, 0.1 to 2.0% of Si, 0.10 to 1.0% of Mn, 0.5 to 3.5% of Cr based on the total mass of the steel sheet, and the rest is Fe and unavoidable impurities, And satisfy content ratio Mn / (Mn+Cr)<0.50. Preferably, the high tensile steel sheet of the present invention may further contain 0.1 to 3.0% of Ni, 0.01 to 3.0% of Cu, and 0.001 to 0.1% of Al based on the total mass of the steel sheet.

[0017] C (carbon) is particularly effective in increasing the strength of a high tensile steel sheet. If the C content of the high tensile steel sheet is less than 0.15%, the high tensile steel sheet cannot secure desired strength. If the C content of the high tensile steel sheet exceeds 0.25%, the high...

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Abstract

Provided are a high-tensile steel sheet, a steel sheet joining method, and a high-strength automobile part, wherein the high-tensile steel sheet contains 0.15 to 0.25% by mass of C, 0.1 to 2.0% by mass of Si, and 0.10 to 1.0% by mass of Si based on the total mass of the steel sheet. Mn, 0.5 to 3.5% by mass of Cr, 0.02% by mass or less of P, 0.01% by mass or less of S, the rest being Fe and unavoidable impurities, and satisfying the content ratio: Mn / (Mn+Cr)< 0.50.

Description

technical field [0001] The present invention relates to a high-tensile steel plate, a joining method of the high-tensile steel plate, and a high-strength automobile part using the high-tensile steel plate. Background technique [0002] To reduce vehicle weight, automotive steel sheets have been subjected to tensile strength enhancement. However, there is a disadvantage that when such a high-tensile steel sheet is joined by electric resistance welding, the toughness of the electric resistance welded portion of the steel sheet deteriorates during the rapid heating and chilling steps of the electric resistance welding process, so that the steel sheet may not exhibit sufficient and Stable joint strength. [0003] In order to solve the above disadvantages, Japanese Patent Application Laid-Open No. 03-180445 proposes a high-tensile automobile steel sheet formed with a limited amount of additive elements, especially carbon. Contents of the invention [0004] As the carbon conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/42C21D9/50
Inventor 小野仁干笹冈秀行中西荣三郎冈田义夫道浦吉晴高木晶章
Owner NISSAN MOTOR CO LTD