ULTRA HIGH-STRENGTH WELDED JOINT AND METHOD FOR PRODUCING SAME

Title:

ULTRA HIGH-STRENGTH WELDED JOINT AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2011/155620

Kind Code:

A1

Abstract:

Disclosed is an ultra high-strength welded joint having excellent strength and toughness, which uses a steel sheet having a thickness of 4-12 mm and contains a welded metal that has a martensite single phase structure. The ultra high-strength welded joint is characterized in that: in a cross section perpendicular to the welding direction, the welded metal has a cross-sectional shape wherein the width W1 at the steel sheet surface is 2.0-7.0 mm and the width W2 at a depth of 3/4 of the thickness from the steel sheet surface is 0.5-2.4 mm; and the welded metal contains more than 0.09% but 0.24% or less of C, 0.2-1.0% of Si, 0.5-2.5% of Mn, 0.02% or less of P, 0.02% or less of S, 0.004-0.08% of Al, 0.005-0.15% of Ti, 0.005-0.05% of O and 1.0-9% of Ni, and has a carbon equivalent (Ceq) of 0.40-1.00% and a Y value, which is defined by {([Si] + [Mn])/40 + [Al] + [Ti]}, of 0.07-0.20%. Also disclosed is a method for producing the welded joint by a single pass of laser hybrid welding.

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Inventors:

NAKAMURA SHUICHI (JP)
KOJIMA KAZUHIRO (JP)

Application Number:

PCT/JP2011/063425

Publication Date:

December 15, 2011

Filing Date:

June 06, 2011

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
NAKAMURA SHUICHI (JP)
KOJIMA KAZUHIRO (JP)

International Classes:

B23K35/30; B23K9/16; B23K9/173; B23K9/23; B23K26/21; B23K26/346; C22C38/00; C22C38/58

Foreign References:

JP2008248315A	2008-10-16
JP2002121642A	2002-04-26
JPH10324950A	1998-12-08
JP2008023569A	2008-02-07
JP2008248315A	2008-10-16

Other References: