Duplex stainless steel material
Abstract
The duplex stainless steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.030% or less, Si: 0.20 to 1.00%, Mn: 0.50 to 7.00%, P: 0.040% or less, S: 0.0100% or less, Al: 0.100% or less, Ni: 4.20 to 9.00%, Cr: 20.00 to 28.00%, Mo: 0.50 to 2.00%, Cu: 1.90 to 4.00%, N: 0.150 to 0.350%, V: 0.01 to 1.50%, and one or more types of element selected from the group consisting of Ca: 0.0001 to 0.0200% and Mg: 0.0001 to 0.0200%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2) described in the description, a microstructure consisting of 35.0 to less than 50.0% of ferrite in volume ratio and austenite as the balance, and a yield strength of 550 MPa or more.
Claims
exact text as granted — not AI-modified1 . A duplex stainless steel material comprising:
a chemical composition consisting of, in mass %, C: 0.030% or less, Si: 0.20 to 1.00%, Mn: 0.50 to 7.00%, P: 0.040% or less, S: 0.0100% or less, Al: 0.100% or less, Ni: 4.20 to 9.00%, Cr: 20.00 to 28.00%, Mo: 0.50 to 2.00%, Cu: 1.90 to 4.00%, N: 0.150 to 0.350%, V: 0.01 to 1.50%, Nb: 0 to 0.100%, Ta: 0 to 0.100%, Ti: 0 to 0.100%, Zr: 0 to 0.100%, Hf: 0 to 0.100%, B: 0 to 0.0200%, and rare earth metal: 0 to 0.200%, and one or more types of elements selected from the group consisting of: Ca: 0.0001 to 0.0200%, and Mg: 0.0001 to 0.0200%, with the balance being Fe and impurities, satisfying Formulae (1) and (2); a microstructure consisting of 35.0 to less than 50.0% of ferrite in volume ratio and austenite as the balance; and a yield strength of 550 MPa or more:
4
.
5
0
≤
Mn
+
Cu
≤
9.50
(
1
)
13
×
Cr
-
19
×
Ni
+
21
×
Mo
-
17
×
Cu
+
63
×
Mn
+
8
×
Si
+
984
×
N
≥
580
(
2
)
where, a content in mass % of a corresponding element is substituted for each symbol of an element in Formulae (1) and (2).
2 . The duplex stainless steel material according to claim 1 , wherein
the chemical composition contains one or more types of elements selected from the group consisting of: Nb: 0.001 to 0.100%, Ta: 0.001 to 0.100%, Ti: 0.001 to 0.100%, Zr: 0.001 to 0.100%, and Hf: 0.001 to 0.100%.
3 . The duplex stainless steel material according to claim 1 , wherein
the chemical composition contains one or more types of elements selected from the group consisting of: B: 0.0005 to 0.0200%, and rare earth metal: 0.001 to 0.200%.
4 . The duplex stainless steel material according to claim 2 , wherein
the chemical composition contains one or more types of elements selected from the group consisting of: B: 0.0005 to 0.0200%, and rare earth metal: 0.001 to 0.200%.Join the waitlist — get patent alerts
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