US2019048447A1PendingUtilityA1
High Strength Steel Alloy and Strip and Sheet Product Made Therefrom
Est. expiryDec 20, 2033(~7.4 yrs left)· nominal 20-yr term from priority
Inventors:Paul M. Novotny
C22C 38/42C21D 1/58C21D 6/005C22C 38/001C22C 38/002C21D 6/004C22C 38/02C22C 38/06C22C 38/44C22C 38/46C22C 38/48C22C 38/50C22C 38/52C22C 38/58C21D 1/18C22C 38/34C21D 8/0263
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Claims
Abstract
An alloy is disclosed that provides a unique combination of very high strength, toughness, and ductility. The alloy can be characterized by the following weight percent composition. C 0.3-0.6 Mn 3.0-4.5 Si 1.0-2.0 Cr 0.6-2.5 Ni 0.6-5.0 Mo + ½W Up to 0.5 Cu 0.3-1.0 Co 0.01 max. V + 5/9Nb 0.1-0.5 Ti 0.025 max. Al 0.025 max. Ca 0.005 max. N 0.02 max. The balance is iron and the usual impurities, wherein the impurities include not more than about 0.03% phosphorus and not more than about 0.003% sulfur. The alloy is further defined by containing Si, Cu, V, and optionally Nb such that 2≤(% Si+% Cu)/(% V+( 5/9)×% Nb)≤34.
Claims
exact text as granted — not AI-modified1 . A steel alloy consisting essentially of, in weight percent:
C
0.30-0.45
Mn
3.5-4.5
Si
1.0-1.8
Cr
1.6-2.5
Ni
3.7-4.5
Mo + ½W
0.3 max.
Cu
0.3-0.7
Co
0.01 max.
V + 5/9Nb
0.30-0.50
Ti
0.020 max.
Al
0.020 max.
Ca
0.002 max.
N
0.02 max.
and the balance is iron and the usual impurities, wherein said impurities include not more than about 0.025% phosphorus and not more than about 0.0025% sulfur; and wherein
4.5≤(% Si+% Cu)/(% V+( 5/9)×% Nb)≤10; (a)
3.5≤(% Mo+% Cr)/(% C)≤7.5; and (b)
3.5≤% Mn+% Ni≤8.0. (c)
2 . The alloy as claimed in claim 1 which contains 1.3-1.8% silicon.
3 . The alloy as claimed in claim 1 which contains 1.3-1.7% silicon.
4 . The alloy as claimed in claim 1 which contains 1.6-2.35% chromium.
5 . The alloy as claimed in claim 1 which contains 3.7-4.3% nickel.
6 . The alloy as claimed in claim 1 which contains not more than about 0.1% Mo+½W.
7 . The alloy as claimed in claim 1 which contains 0.4-0.7% copper.
8 . The alloy as claimed in claim 1 which contains 0.4-0.6% copper.
9 . The alloy as claimed in claim 1 which contains 0.30-0.40% V+ 5/9Nb.
10 . The alloy as claimed in claim 1 which also contains 0.001-0.025% yttrium.
11 . The alloy as claimed in claim 1 which also contains 0.001-0.01% magnesium.
12 . A thin gauge article made from the alloy claimed in claim 1 .
13 . A shaped part made from the thin gauge article claimed in claim 12 .
14 . A steel alloy consisting essentially of, in weight percent:
C
0.30-0.40
Mn
3.5-4.5
Si
1.0-1.7
Cr
1.6-2.35
Ni
3.7-4.3
Mo + ½W
0.1 max.
Cu
0.4-0.6
Co
0.01 max.
V + 5/9Nb
0.30-0.40
Ti
0.020 max.
Al
0.020 max.
Ca
0.002 max.
N
0.02 max.
and the balance is iron and the usual impurities, wherein said impurities include not more than about 0.025% phosphorus and not more than about 0.0025% sulfur; and wherein
4.5≤(% Si+% Cu)/(% V+( 5/9)×% Nb)≤10; (a)
3.5≤(% Mo+% Cr)/(% C)≤7.5; and (b)
3.5≤% Mn+% Ni≤8. (c)
15 . The alloy as claimed in claim 14 which also contains 0.001-0.025% yttrium.
16 . The alloy as claimed in claim 14 which also contains 0.001-0.01% magnesium.
17 . A thin gauge article made from the alloy claimed in claim 14 .
18 . A shaped part made from the thin gauge article claimed in claim 17 .
19 . A steel alloy consisting essentially of, in weight percent
C
0.30-0.36
Mn
3.5-4.5
Si
1.3-1.7
Cr
0.75-1.5
Ni
0.7-2.5
Mo + ½W
0.15-0.25
Cu
0.4-0.6
Co
0.01 max.
V + 5/9Nb
0.20-0.30
Ti
0.020 max.
Al
0.020 max.
Ca
0.002 max.
N
0.02 max.
and the balance is iron and the usual impurities, wherein said impurities include not more than about 0.025% phosphorus and not more than about 0.0025% sulfur; and wherein
2≤(% Si+% Cu)/(% V+( 5/9)×% Nb)≤34.
20 . The steel alloy as claimed in claim 19 which also contains 0.001-0.025% yttrium.
21 . The steel alloy as claimed in claim 19 which also contains 0.001-0.01% magnesium.
22 . The steel alloy as claimed in claim 19 which contains at least 1.6% chromium.
23 . The steel alloy as claimed in claim 19 which contains at least 3.7% nickel.
24 . The steel alloy as claimed in claim 23 which contains not more than 4.3% nickel.
25 . The steel alloy as claimed in claim 19 which contains at least 3.5% manganese.
26 . The steel alloy as claimed in claim 19 which contains at least 1.3% silicon.
27 . The steel alloy as claimed in claim 26 which contains not more than 1.7% silicon.
28 . The steel alloy as claimed in claim 19 which contains at least 0.4% copper.
29 . The steel alloy as claimed in claim 28 which contains not more than 0.6% copper.
30 . The steel alloy as claimed in claim 19 wherein Mo+½W is not more than 0.1%.
31 . The steel alloy as claimed in claim 19 wherein V+ 5/9Nb is not more than 0.4%.Join the waitlist — get patent alerts
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