Manufacturing method of steel material, blank, and hot stamped part

By applying a steel material with non-formed aluminum plating regions and specific elemental compositions, the strength of laser-welded portions in patchwork blanks is enhanced, addressing the issue of reduced weld metal strength in aluminum-plated steel sheets.

JP7626304B2Active Publication Date: 2025-02-07NIPPON STEEL CORPORATION
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Patent Information

Application Number
JP2019222003
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2019-12-09
Publication Date
2025-02-07
Estimated Expiration
2039-12-09

AI Technical Summary

Technical Problem

The integration of aluminum-plated steel sheets in patchwork blanks and tailored welded blanks results in reduced weld metal strength due to aluminum penetration during laser welding, compromising the joint strength.

Method used

A steel material with an aluminum plating layer on at least one surface, featuring non-formed regions of the aluminum plating layer at least 5 mm away from the edge, and specific elemental compositions, is used to prevent aluminum mixing in the weld metal portion by laser welding.

Benefits of technology

The method enhances the strength of the laser-welded portions in patchwork blanks, ensuring improved joint integrity and reduced strength loss during hot stamping processes.

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Abstract

To provide a steel that can improve the strength of a laser weld of a patchwork blank and a blank formed using the same.SOLUTION: A steel has a base material, at least one surface(s) of which is coated with an Al plating layer. At least one of the at least one surface(s) coated with the Al plating layer includes an Al plating layer non-formed area, and the Al plating layer non-formed area is formed at a position away from the edge of the steel by 5 mm or more. The Al plating layer contains, in mass%, Si: 0.05-15.00%, Zn: 0-30.00%, Mg: 0-5.00%, Fe: 0-30.00%, Ca: 0-3.00%, Sb: 0-0.50%, Pb: 0-0.50%, Cu: 0-1.00%, Sn: 0-1.00%, Ti: 0-1.00%, Sr: 0-0.50%, Cr: 0-1.00%, Ni: 0-1.00%, and Mn: 0-1.00%, with the balance being Al and 1.00% or less impurities.SELECTED DRAWING: Figure 4
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Citation Information

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