US2007113931A1PendingUtilityA1
Ultra-high strength martensitic alloy
Individually held — no corporate assignee on recordPriority: Nov 18, 2005Filed: Nov 18, 2005Published: May 24, 2007
Est. expiryNov 18, 2025(expired)· nominal 20-yr term from priority
Inventors:Paul M. Novotny
C22C 38/44C22C 38/52C22C 38/005
55
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Claims
Abstract
An age hardenable martensitic steel alloy is disclosed. The alloy has the following composition in weight percent. C 0.30-0.36 Mn 0.05 max. Si 0.05 max. P 0.01 max. S 0.0010 max. Cr 1.30-3.2 Ni 10.0-13.0 Mo 1.0-2.70 Co 13.8-17.4 Ti 0.02 max. Al 0.005 max. Ce 0.030 max. La 0.010 max. The balance is iron and the usual impurities. The composition of this alloy is balanced to provide a unique combination of very high strength, together with good toughness, ductility, and resistance to fatigue.
Claims
exact text as granted — not AI-modified1 . An age hardenable martensitic steel alloy, consisting essentially of, in weight percent, about
C
0.30-0.36
Mn
0.05 max.
Si
0.05 max.
P
0.005 max.
S
0.0010 max.
Cr
1.30-3.2
Ni
10.0-13.0
Mo
1.0-2.70
Co
13.8-17.4
Ti
0.02 max.
Al
0.005 max.
Ce
0.030 max.
La
0.010 max.
the balance being iron and usual impurities.
2 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains at least about 11.0 weight percent nickel.
3 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains at least about 2.0 weight percent chromium.
4 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains not more than about 2.5 weight percent chromium.
5 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains not more than about 16.0 weight percent cobalt.
6 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains at least about 15.0 weight percent cobalt.
7 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains at least about 1.50 weight percent molybdenum.
8 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains not more than about 2.2 weight percent molybdenum.
9 . An age hardenable martensitic steel alloy as set forth in claim 1 that contains at least about 0.32 weight percent carbon.
10 . An age hardenable martensitic steel alloy, consisting essentially of, in weight percent, about
C
0.32-0.35
Mn
0.05 max.
Si
0.05 max.
P
0.005 max.
S
0.0010 max.
Cr
2.0-2.5
Ni
11.0-13.0
Mo
1.5-2.2
Co
15.0-16.0
Ti
0.015 max.
Al
0.003 max.
Ce
0.020 max.
La
0.010 max.
the balance being iron and usual impurities.
11 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains at least about 11.5 weight percent nickel.
12 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains at least about 2.20 weight percent chromium.
13 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains not more than about 2.30 weight percent chromium.
14 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains not more than about 15.6 weight percent cobalt.
15 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains at least about 15.4 weight percent cobalt.
16 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains at least about 1.80 weight percent molybdenum.
17 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains not more than about 2.0 weight percent molybdenum.
18 . An age hardenable martensitic steel alloy as set forth in claim 10 that contains not more than about 0.34 weight percent carbon.
19 . An age hardenable martensitic steel alloy, consisting essentially of, in weight percent, about
C
0.32-0.34
Mn
0.04 max.
Si
0.03 max.
P
0.003 max.
S
0.0005 max.
Cr
2.20-2.30
Ni
11.5-12.5
Mo
1.80-1.90
Co
15.4-15.6
Ti
0.01 max.
Al
0.001 max.
Ce
0.010 max.
La
0.005 max.
the balance being iron and usual impurities.
20 . An age hardenable martensitic steel alloy as set forth in claim 1 comprising an element selected from the group consisting of calcium, magnesium, yttrium, and combinations thereof, in place of at least a portion of the cerium and lanthanum.Join the waitlist — get patent alerts
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