Title:
FERRITE-AUSTENITE TWO-PHASE SYSTEM STAINLESS STEEL MATERIAL AND METHOD FOR MANUFACTURING THEM, AND CORROSION-RESISTANT MEMBER
Document Type and Number:
Japanese Patent JP2022155339
Kind Code:
A
Abstract:
To provide a ferrite-austenite two-phase system stainless steel material which has smooth and glossy surface and has excellent corrosion resistance and fatigue characteristics.SOLUTION: A ferrite-austenite two-phase system stainless steel material 10 has a composition comprising, by mass, 0.001 to 0.150% C, 1.00% or less Si, 6.00% or less Mn, 0.050% or less P, 0.0300% or less S, 1.00 to 9.00% Ni, 15.00 to 30.00% Cr, 5.00% or less Mo, 2.00% or less Cu, 0.400% or less N, and 0.400% or less Al, wherein Si+2Al is less than 1.20%, and the balance Fe and inevitable impurities. The ferrite-austenite two-phase system stainless steel material 10 has a ratio D2/D1 of a number density D2 of an inclusion 13 on a surface B to a number density D1 of the inclusion 13 in a parent phase 11 at a position C where a depth from the surface B is 1/4 of the thickness of 0.50 or less.SELECTED DRAWING: Figure 1
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Inventors:
KONO AKINORI
MORITA KAZUNARI
MORITA KAZUNARI
Application Number:
JP2021058780A
Publication Date:
October 13, 2022
Filing Date:
March 30, 2021
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP
International Classes:
C22C38/00; B21B1/22; B21B3/02; B23K26/36; C21D9/46; C22C38/58
Attorney, Agent or Firm:
Axis International Patent Business Corporation