Patent ID: 11946126
Assignee: NIPPON STEEL STAINLESS STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A welded structure including a base material made of duplex stainless steel and a welded portion in which the base materials are welded to each other,
wherein a chemical composition of the base material includes, in mass %,
C: 0.050% or less,
Si: 0.03 to 5.00%,
Mn: 0.01 to 8.00%,
P: 0.070% or less,
S: 0.0500% or less,
Ni: 1.0 to 30.0%,
Cr: 15.0 to 30.0%,
Mo: 0.010 to 8.000%,
Cu: 0.010 to 5.000%,
N: 0.050 to 0.800%,
Al: 0 to 1.00%,
Ti: 0 to 0.400%,
Nb: 0 to 0.40%,
V: 0 to 0.50%,
W: 0 to 1.0%,
Zr: 0 to 0.200%,
Ta: 0 to 0.100%,
Sn: 0 to 0.50%,
Sb: 0 to 0.50%,
Ga: 0 to 0.50%,
B: 0 to 0.0050%,
Ca: 0 to 0.0050%,
Mg: 0 to 0.0050%, and
REM: 0 to 0.10%, and
the remainder of Fe and impurities,
a volume fraction of a ferrite phase in a metallographic structure of a weld metal of the welded portion is 45 to 75%,
a ratio of a hardness of the weld metal to a hardness of the base material is 0.80 to 1.20, and
an amount of precipitates formed in the ferrite phase of the weld metal is less than 10% in area fraction.