High Strength Steel Alloy and Strip and Sheet Product Made Therefrom
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 that provides a unique combination of strength, toughness, and ductility said alloy consisting essentially of, in weight percent
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.
and the balance is iron and the usual impurities, wherein said impurities include not more than about 0.03% phosphorus and not more than about 0.003% sulfur; and wherein
2≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦34.
2 . The alloy as claimed in claim 1 wherein (Mo+½W) is at least about 0.20%.
3 . The alloy as claimed in claim 2 wherein 3.5≦(% Mo+% Cr)/(% C)≦7.5.
4 . The alloy as claimed in claim 1 wherein 3.5≦% Mn+% Ni≦8.
5 . The alloy as claimed in claim 1 wherein 4.5≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦10.
6 . The alloy as claimed in claim 1 which also contains 0.001-0.025% yttrium.
7 . The alloy as claimed in claim 1 which also contains 0.001-0.01% magnesium.
8 . A steel alloy that provides a unique combination of strength, toughness, and ductility said alloy consisting essentially of, in weight percent
C
0.30-0.45
Mn
3.5-4.5
Si
1.3-1.8
Cr
0.75-2.35
Ni
0.7-4.5
Mo + ½W
Up to 0.3
Cu
0.4-0.7
Co
0.01 max.
V + 5/9Nb
0.2-0.4
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 0.03% phosphorus and not more than about 0.003% sulfur; and wherein
4.5≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦10.
9 . The alloy as claimed in claim 8 wherein (Mo+½W) is at least about 0.20%.
10 . The alloy as claimed in claim 9 wherein 3.5≦(% Mo+% Cr)/(% C)≦7.5.
11 . The alloy as claimed in claim 8 wherein 3.5≦% Mn+% Ni≦8.
12 . The alloy as claimed in claim 8 wherein 4.5≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦10.
13 . The alloy as claimed in claim 8 which also contains 0.001-0.025% yttrium.
14 . The alloy as claimed in claim 8 which also contains 0.001-0.01% magnesium.
15 . A steel alloy that provides a unique combination of strength, toughness, and ductility said alloy consisting essentially of, in weight percent
C
0.30-0.40
Mn
3.5-4.5
Si
1.3-1.7
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
(a) 4.5≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦10;
(b) 4.25≦(% Mo+% Cr)/(% C)≦7.5; and
(c) 3.5≦% Mn+% Ni≦8.0.
16 . The alloy as claimed in claim 15 which also contains 0.001-0.025% yttrium.
17 . The alloy as claimed in claim 15 which also contains 0.001-0.01% magnesium.
18 . A thin gauge article made from the alloy claimed in claim 15 .
19 . A shaped part made from the thin gauge article claimed in claim 18 .
20 . A steel alloy that provides a unique combination of strength, toughness, and ductility, said steel 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.Join the waitlist — get patent alerts
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