CPC C22C 38/58 (2013.01) [C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); F28F 21/083 (2013.01)] | 6 Claims |
1. A steel comprising of in weight % (wt. %):
Cr 8.0-14.0
Ni 4.0-14.0
Al 2.5-5.0
C 0.003-0.3
N≤0.06
Mo+W≤4.0
at least one of:
Nb 0.01-1.0
Ta 0.01-1.0
Ti 0.01-1.0
Zr 0.01-1.0
Hf 0.01-1.0
Y 0.05-1.0
optionally
Si≤2.0
Mn≤ 4.0
Cu≤ 4
Co≤2
V≤1
B≤0.1
Bi≤0.2
Se≤ 0.3
Ca≤ 0.01
Mg≤ 0.01
O 0.02-0.50
RE≤ 0.3
balance Fe apart from impurities, wherein the content of RE does not include the amount of Y but only the amount of the elements having the atomic number 21 and/or any one of the atomic numbers 57-71;
the steel composition fulfills the following condition:
Cr(eq)+Ni(eq)≤30;
where
Cr(eq)=Cr+2A1+1.5(Si+Nb+Ti)+Mo+0.5W; and
Ni(eq)=Ni+10(C+N)+0.5(Mn+Cu+Co); and
wherein the steel has at least 35 vol-% martensite structure.
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