JPWO2022114145A5 - - Google Patents

Claims (9)

A duplex stainless steel sheet containing an austenite phase and a ferrite phase,
in % by mass,
C: 0.080% or less,
Si: 1.00% or less,
Mn: 4.00% or less,
P: 0.040% or less,
S: 0.0300% or less,
Ni: 1.50 to 8.00%,
Cr: 18.00 to 28.00%,
Mo: 5.00% or less,
Cu: 0.05 to 1.50%, and
N: 0.080 to 0.320%,
and the balance consists of Fe and impurities,
A ferrite phase texture in which the <111> direction is oriented in the rolling direction at the center of the plate thickness of the cross section in the direction perpendicular to the rolling direction, which is the direction perpendicular to the rolling direction on the rolled surface and parallel to the plate thickness direction. The area ratio S _<001> / S <111>, which is the ratio of the area ratio S _<001> of the texture of the ferrite phase in which the <001> direction is oriented in the direction perpendicular to the rolling, to the area ratio S _{<111> of} Duplex stainless steel sheet, which is 0.90 to 1.10. The duplex stainless steel sheet according to claim 1, wherein the surface waviness height in the rolling direction is 0.3 µm or less. in % by mass,
C: 0.030% or less,
Si: 0.75% or less,
Mn: 2.00-4.00%,
P: 0.040% or less,
S: 0.0200% or less,
Ni: 1.50 to 2.50%,
Cr: 18.00-21.50%,
Mo: 0.60% or less,
Cu: 0.50 to 1.50%, and
N: 0.150 to 0.200%,
The duplex stainless steel sheet according to claim 1 or 2, containing Fe and impurities as the balance. Converting to part of Fe, in % by mass,
Al: 0.003 to 0.050%,
O: 0.0070% or less,
Nb: 0.005 to 0.20%,
Ti: 0.005 to 0.20%,
Co: 0.005-0.25%,
V: 0.005 to 0.15%,
Sn: 0.005 to 0.20%,
Sb: 0.005 to 0.20%,
Ga: 0.001 to 0.050%,
Zr: 0.005 to 0.50%,
Ta: 0.005 to 0.100%, and
B: 0.0002 to 0.0050%,
The duplex stainless steel sheet according to any one of claims 1 to 3, containing one or more selected from the group consisting of: A duplex stainless steel hot-rolled sheet containing an austenite phase and a ferrite phase,
in % by mass,
C: 0.080% or less,
Si: 1.00% or less,
Mn: 4.00% or less,
P: 0.040% or less,
S: 0.0300% or less,
Ni: 1.50 to 8.00%,
Cr: 18.00 to 28.00%,
Mo: 5.00% or less,
Cu: 0.05 to 1.50%, and
N: 0.080 to 0.320%,
and the balance consists of Fe and impurities,
A duplex stainless steel hot-rolled sheet, wherein the difference between the Vickers hardness of the austenite phase and the Vickers hardness of the ferrite phase is 50 HV or more and 75 HV or less. in % by mass,
The duplex stainless steel hot-rolled sheet according to claim 5, containing Ni: 2.00 to 8.00%. Converting to part of Fe, in % by mass,
Al: 0.003 to 0.050%,
O: 0.0070% or less,
Nb: 0.005 to 0.20%,
Ti: 0.005 to 0.20%,
Co: 0.005-0.25%,
V: 0.005 to 0.15%,
Sn: 0.005 to 0.20%,
Sb: 0.005 to 0.20%,
Ga: 0.001 to 0.050%,
Zr: 0.005 to 0.50%,
Ta: 0.005 to 0.100%, and
B: 0.0002 to 0.0050%,
The duplex stainless steel hot-rolled sheet according to claim 5 or 6, containing one or more selected from the group consisting of: in % by mass,
C: 0.080% or less,
Si: 1.00% or less,
Mn: 4.00% or less,
P: 0.040% or less,
S: 0.0300% or less,
Ni: 1.50 to 6.80%,
Cr: 18.00 to 28.00%,
Mo: 5.00% or less,
Cu: 0.05-1.50%, and N: 0.080-0.320%,
A hot rolling step of hot rolling a stainless steel material containing and the balance being Fe and impurities, and winding at a temperature of 680 ° C. or higher;
a heat treatment step of performing a heat treatment of holding the stainless steel material after the hot rolling step at a temperature of 500° C. or more and less than 600° C. for 1 hour or more;
a cold rolling step of cold rolling the stainless steel material after the heat treatment step. Converting to part of Fe, in % by mass,
Al: 0.003 to 0.050%,
O: 0.0070% or less,
Nb: 0.005 to 0.20%,
Ti: 0.005 to 0.20%,
Co: 0.005-0.25%,
V: 0.005 to 0.15%,
Sn: 0.005 to 0.20%,
Sb: 0.005 to 0.20%,
Ga: 0.001 to 0.050%,
Zr: 0.005 to 0.50%,
Ta: 0.005 to 0.100%, and
B: 0.0002 to 0.0050%,
The method for producing a duplex stainless steel sheet according to claim 8, containing one or more selected from the group consisting of: