High Strength Precipitation Hardenable Stainless Steel
Abstract
A precipitation hardenable, martensitic stainless steel alloy is disclosed. The alloy has the following composition in weight percent, about C 0.03 max Mn 1.0 max Si 0.75 max P 0.040 max S 0.020 max Cr 10-13 Ni 10.5-11.6 Mo 0.25-1.5 Co 0.5-1.5 Cu 0.75 max Ti 1.5-1.8 Al 0.3-0.8 Nb 0.3-0.8 B 0.010 max N 0.030 max The balance is iron and usual impurities. The disclosed alloy provides a unique combination of corrosion resistance, strength, and toughness.
Claims
exact text as granted — not AI-modified1 . A precipitation hardenable, martensitic stainless steel alloy having a unique combination of strength, toughness, and corrosion resistance comprising in weight percent, about
C
0.03 max
Mn
1.0 max
Si
0.75 max
P
0.040 max
S
0.020 max
Cr
10-13
Ni
10.5-11.6
Mo
0.25-1.5
Cu
0.75 max
Co
0.5-1.5
Ti
1.5-1.8
Al
0.3-0.8
Cb
0.3-0.8
B
0.010 max
N
0.030 max
and the balance is iron and usual impurities.
2 . The alloy recited in claim 1 which contains no more than about 0.50% copper.
3 . The alloy recited in claim 1 which contains at least about 0.75% cobalt.
4 . The alloy recited in claim 1 which contains at least about 0.4% columbium.
5 . The alloy recited in claim 1 which contains at least about 10.75% nickel.
6 . The alloy recited in claim 1 which contains at least about 0.4% aluminum.
7 . The alloy recited in claim 1 which contains at least about 10.5% chromium.
8 . The alloy recited in claim 1 which contains not more than about 12.5% chromium.
9 . The alloy recited in claim 1 which contains not more than about 1.7% titanium.
10 . The alloy recited in claim 1 which contains not more than about 1.25% molybdenum.
11 . The alloy recited in claim 1 which contains at least about 0.75 weight percent molybdenum.
12 . The alloy recited in claim 1 which contains up to about 0.003% calcium.
13 . The alloy recited in claim 1 which contains up to about 0.025% cerium.
14 . A precipitation hardenable, martensitic stainless steel alloy having a good combination of corrosion resistance, strength, and toughness comprising in weight percent, about
C
0.02 max
Mn
0.25 max
Si
0.25 max
P
0.015 max
S
0.010 max
Cr
10.5-12.5
Ni
10.75-11.25
Mo
0.75-1.25
Cu
0.50 max
Co
0.75-1.25
Ti
1.5-1.7
Al
0.4-0.7
Cb
0.4-0.7
B
0.001-0.005
N
0.015 max
and the balance is iron and usual impurities.
15 . The alloy recited in claim 14 which contains not more than about 1.1% cobalt.
16 . The alloy recited in claim 14 which contains at least about 0.9% cobalt.
17 . The alloy recited in claim 14 which contains at least about 10.85% nickel.
18 . The alloy recited in claim 14 which contains not more than about 0.6% columbium.
19 . The alloy recited in claim 14 which contains at least about 0.45% aluminum.
20 . The alloy recited in claim 14 which contains not more than about 0.65% aluminum.
21 . The alloy recited in claim 14 which contains at least about 0.9% molybdenum.
22 . The alloy recited in claim 14 which contains up to about 0.003% calcium.
23 . The alloy recited in claim 14 which contains up to about 0.025% cerium.
24 . A precipitation hardenable, martensitic stainless steel alloy having a good combination of corrosion resistance, strength, and toughness consisting essentially of, in weight percent, about
C
0.015 max
Mn
0.10 max
Si
0.10 max
P
0.010 max
S
0.005 max
Cr
11.0-12.0
Ni
10.85-11.25
Mo
0.9-1.1
Co
0.9-1.1
Cu
0.25 max
Ti
1.5-1.7
Al
0.45-0.65
Cb
0.4-0.6
B
0.0015-0.0035
N
0.010 max
and the balance is iron and usual impurities.
25 . The alloy recited in claim 24 which contains up to about 0.003% calcium.
26 . The alloy recited in claim 24 which contains up to about 0.025% cerium.Join the waitlist — get patent alerts
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