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 consisting essentially of, in weight percent,
Mn
up to about 1.0
Si
up to about 0.75
Cr
about 10 to about 13
Ni
about 10.75 to about 11.6
Mo
about 0.25 to about 1.5
Cu
not more than about 0.25
Co
about 0.9 to about1.5
Ti
about 1.5 to about 1.8
Al
about 0.4 to about 0.8
Cb
about 0.3 to about 0.6
B
up to about 0.010
and the balance is iron and usual impurities, said impurities including about 0.040% max. phosphorus, about 0.005% max. sulfur, about 0.03% max. carbon, and about 0.030% max. nitrogen.
2 . The alloy recited in claim 1 which contains at least about 0.4% columbium.
3 . The alloy recited in claim 1 which contains at least about 10.5% chromium.
4 . The alloy recited in claim 1 which contains not more than about 12.5% chromium.
5 . The alloy recited in claim 1 which contains not more than about 1.7% titanium.
6 . The alloy recited in claim 1 which contains not more than about 1.25% molybdenum.
7 . The alloy recited in claim 1 which contains at least about 0.75 weight percent molybdenum.
8 . The alloy recited in claim 1 which further contains up to about 0.005% calcium.
9 . The alloy recited in claim 1 which further contains up to about 0.025% cerium.
10 . A precipitation hardenable, martensitic stainless steel alloy consisting essentially of, in weight percent,
Mn
up to about 0.25
Si
up to about 0.25
Cr
about 10.5 to about 12.5
Ni
about 10.75 to about 11.25
Mo
about 0.75 to about 1.25
Cu
not more than about 0.25
Co
about 0.9 to about 1.25
Ti
about 1.5 to about 1.7
Al
about 0.45 to about 0.8
Cb
about 0.4 to about 0.6
B
about 0.001 to about 0.005
and the balance is iron and usual impurities, said impurities including about 0.015% max. phosphorus, about 0.005% max. sulfur, about 0.02% max. carbon, and about 0.015% max. nitrogen.
11 . The alloy recited in claim 10 which contains not more than about 1.1% cobalt.
12 . The alloy recited in claim 10 which contains at least about 10.85% nickel.
13 . The alloy recited in claim 10 which contains not more than about 0.6% columbium.
14 . The alloy recited in claim 10 which contains at least about 0.45% aluminum.
15 . The alloy recited in claim 10 which contains not more than about 0.65% aluminum.
16 . The alloy recited in claim 10 which contains at least about 0.9% molybdenum.
17 . The alloy recited in claim 10 which further contains up to about 0.005% calcium.
18 . The alloy recited in claim 10 which further contains up to about 0.025% cerium.
19 . A precipitation hardenable, martensitic stainless steel alloy consisting essentially of, in weight percent,
Mn
up to about 0.10
Si
up to about 0.10
Cr
about 11.0 to about 12.0
Ni
about 10.85 to about 11.25
Mo
about 0.9 to about 1.1
Co
about 0.9 to about 1.1
Cu
not more than about 0.25
Ti
about 1.5 to about 1.7
Al
about 0.45 to about 0.65
Cb
about 0.4 to about 0.6
B
about 0.0015 to about 0.0035
Ca
up to about 0.005
Ce
up to about 0.025
and the balance is iron and usual impurities, said impurities including about 0.010% max. phosphorus, about 0.005% max. sulfur, about 0.015% max. carbon, and about 0.010% max. nitrogen.Join the waitlist — get patent alerts
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