Martensitic stainless steel material
Abstract
A martensitic stainless steel material that achieves both a high yield strength and excellent SSC resistance is provided. The martensitic stainless steel material according to the present disclosure consists of, in mass %, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Cu: 0.01 to 3.50%, Cr: 10.00 to 14.00%, Ni: 4.50 to 7.50%, Mo: 1.00 to 4.00%, Ti: 0.050 to 0.300%, V: 0.01 to 1.00%, Al: 0.001 to 0.100%, Co: 0.010 to 0.500%, Ca: 0.0005 to 0.0050%, Sn: 0.0005 to 0.0500%, N: 0.0010 to 0.0500%, O: 0.050% or less, and the balance: Fe and impurities, and has a yield strength of 758 MPa or more. Within this range, the contents of elements and the yield strength satisfy Formula (1) described in the description.
Claims
exact text as granted — not AI-modified1 . A martensitic stainless steel material consisting of, in mass %,
C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Cu: 0.01 to 3.50%, Cr: 10.00 to 14.00%, Ni: 4.50 to 7.50%, Mo: 1.00 to 4.00%, Ti: 0.050 to 0.300%, V: 0.01 to 1.00%, Al: 0.001 to 0.100%, Co: 0.010 to 0.500%, Ca: 0.0005 to 0.0050%, Sn: 0.0005 to 0.0500%, N: 0.0010 to 0.0500%, O: 0.050% or less, W: 0 to 0.50%, Nb: 0 to 0.500%, As: 0 to 0.0100%, Sb: 0 to 0.0100%, and the balance: Fe and impurities, wherein: a yield strength is 758 MPa or more; and within a range of contents of elements and the yield strength of the martensitic stainless steel material, the contents of elements and the yield strength satisfy Formula (1);
0.15
≤
(
S
n
+
A
s
+
Sb
)
/
{
(
C
u
+
Ni
)
/
YS
}
≤
1
.
0
0
(
1
)
where, in Formula (1), a content of a corresponding element in percent by mass is substituted for each symbol of an element, and a yield strength in MPa is substituted for YS, and, if a corresponding element is not contained, “0” is substituted for the symbol of the relevant element.
2 . The martensitic stainless steel material according to claim 1 , containing one or more elements selected from a group consisting of:
W: 0.01 to 0.50%, Nb: 0.001 to 0.500%, As: 0.0001 to 0.0100%, and Sb: 0.0001 to 0.0100%.
1 . A martensitic stainless steel material consisting of, in mass %,
C: 0.030% or less, Si: 1.0 0 % or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.0050% or less, Cu: 0.01 to 3.50%, Cr: 10.00 to 14.00%, Ni: 4.50 to 7.50%, Mo: 1.00 to 4.00%, Ti: 0.050 to 0.300%, V: 0.01 to 1.00%, Al: 0.001 to 0.100%, Co: 0.010 to 0.500%, Ca: 0.0005 to 0.0050%, Sn: 0.0005 to 0.0500%, N: 0.0010 to 0.0500%, O: 0.050% or less, W: 0 to 0.50%, Nb: 0 to 0.500%, As: 0 to 0.0100%, Sb: 0 to 0.0100%, and the balance: Fe and impurities, wherein: a yield strength is 758 MPa or more; and within a range of contents of elements and the yield strength of the martensitic stainless steel material, the contents of elements and the yield strength satisfy Formula (1);
0.15
≤
(
S
n
+
A
s
+
Sb
)
/
{
(
C
u
+
Ni
)
/
YS
}
≤
1
.
0
0
(
1
)
where, in Formula (1), a content of a corresponding element in percent by mass is substituted for each symbol of an element, and a yield strength in MPa is substituted for YS, and, if a corresponding element is not contained, “0” is substituted for the symbol of the relevant element.
2 . The martensitic stainless steel material according to claim 1 , containing one or more elements selected from a group consisting of:
W: 0.01 to 0.50%, Nb: 0.001 to 0.500%, As: 0.0001 to 0.0100%, and Sb: 0.0001 to 0.0100%.Join the waitlist — get patent alerts
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