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

a technology of high-tensile steel and steel sheets, applied in the field of high-tensile steel sheets, can solve the problems of steel sheets deteriorating in hardenability, and achieve the effects of no deterioration in hardenability, and no deterioration in resistance welding strength

Inactive Publication Date: 2007-11-22
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for improved performance during high-strength steels used at elevated temperatures such as those commonly seen today due to their use over extended periods or under harsh conditions. By adding specific elements like chrome instead of mangant (Mn) within certain limits, this can improve its ability to resist damage from heat exposure while still maintaining good workpiece quality.

Problems solved by technology

The technical problem addressed in this patented technology is how to improve the properties of high-tension steels used in vehicles without compromising their ability to resist spotting or cracking caused by thermal stress after they were connected through resistance winding processes like laser beam welds (LFW).

Method used

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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]A high-tensile steel sheet according to the present invention will be described in detail below. In the following description, all percentages are by mass unless otherwise specified.

[0016]The high-tensile steel sheet of the present invention comprises 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 and the balance being Fe and unavoidable impurities based on the total mass of the steel sheet and satisfies a content ratio of Mn / (Mn+Cr)<0.50. Preferably, the high-tensile steel sheet of the present invention may further comprise 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 the high-tensile steel sheet. If the C content of the high-tensile steel sheet is less than 0.15%, the high-tensile steel sheet fails to secure desired strength. If the C content of the high-tensile steel sheet exceeds 0.25%, the high-tensile steel shee

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Abstract

There is provided a high-tensile steel sheet containing 0.15 to 0.25 mass % of C, 0.1 to 2.0 mass % of Si, 0.10 to 1.0 mass % of Mn, 0.5 to 3.5 mass % of Cr, 0.02 mass % or less of P, 0.01 mass % or less of S and the balance being Fe and unavoidable impurities based on the total mass of the steel sheet and satisfying a content ratio of Mn/(Mn+Cr)<0.50.

Description

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Claims

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Application Information

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Owner NISSAN MOTOR CO LTD
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