STAINLESS STEEL HAVING EXCELLENT COLD FORGEABILITY, HYDROGEN EMBRITTLEMENT RESISTANCE PROPERTIES OR CORROSION RESISTANCE AND NON-MAGNETISM

WIPO Patent Application WO/2023/105852

A1

Provided is a stainless steel containing, in % by mass, 8.00 to 30.00% of Ni, 9.0 to 21.0% of Cr, 0.01 to 3.00% of Mo, 0.01 to 5.00% of Cu, and 0.0010 to 0.10% of N. Furthermore, the first invention contains at least one component selected from Al in an amount of 0.001 to 2.0% and B in an amount of 0.0001 to 0.05%, has a micro-strain in a region laying between a steel material surface layer to a depth of D/4 of 0.0040 or less, and has excellent cold forgeability and hydrogen embrittlement resistance properties. The second invention contains 0.0001 to 0.05% of B and 0.0001 to 0.50% of S and also contains at least one component selected from Al in an amount of 0.001 to 2.0% and Ca in an amount of 0.0001 to 0.05%, has a precipitated B amount of 0.0001% or more in terms of a boride, has an aspect ratio of a sulfide of 50 or less, and has excellent cold forgeability, cutting performance and hydrogen embrittlement resistance properties. The third invention contains 0.0001 to 0.05% of B, has a B grain boundary occupancy of 1% or more, has excellent corrosion resistance and cold forgeability, and is non-magnetic.

YAMASAKI SHOTA (JP)
TAKANO KOHJI (JP)
TOHJOH MASAYUKI (JP)
TANAKA KISUKE (JP)

PCT/JP2022/029784

June 15, 2023

August 03, 2022

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NIPPON STEEL STAINLESS STEEL CORP (JP)

C22C38/00; C22C38/60; C21D8/06; C21D9/00

JP2004307977A	2004-11-04
JP2018109215A	2018-07-12
JP2017160520A	2017-09-14
JP2008240053A	2008-10-09
JP2008208430A	2008-09-11

KINOSHITA & ASSOCIATES (JP)

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