US2010018613A1PendingUtilityA1
High Strength, High Toughness Steel Alloy
Individually held — no corporate assignee on recordPriority: Jul 24, 2008Filed: Jun 19, 2009Published: Jan 28, 2010
Est. expiryJul 24, 2028(~2 yrs left)· nominal 20-yr term from priority
Inventors:Paul M. Novotny
C22C 38/42C21D 6/004C22C 38/34C21D 1/32C22C 38/02C22C 38/46C22C 38/04C22C 38/44C21D 6/00
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Claims
Abstract
A high strength, high toughness steel alloy is disclosed. The alloy has the following broad weight percent composition. Element Broad C 0.35-0.55 Mn 0.6-1.2 Si 0.9-2.5 P 0.01 max. S 0.001 max. Cr 0.75-2.0 Ni 3.5-7.0 Mo + ½ W 0.4-1.3 Cu 0.5-0.6 Co 0.01 max. V + ( 5/9) × Nb 0.2-1.0 Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.
Claims
exact text as granted — not AI-modified1 . A high strength, high toughness steel alloy having good temper resistance, said alloy comprising, in weight percent, about:
Carbon
0.35-0.5
Manganese
0.6-1.2
Silicon
0.9-2.5
Phosphorus
0.01 max.
Sulfur
0.001 max.
Chromium
1.0-1.5
Nickel
3.5-4.5
Molybdenum
0.4-1.3
Copper
0.5-0.6
Cobalt
0.01 max.
Vanadium
0.25-0.35
the balance being iron and usual impurities, and wherein
2≦(% Si+% Cu)/% V≦14.
2 . The alloy as claimed in claim 1 which contains at least about 0.37% carbon.
3 . The alloy as claimed in claim 2 which contains not more than about 0.45% carbon.
4 . The alloy as claimed in claim 1 which contains at least about 1.3% silicon.
5 . The alloy as claimed in claim 4 which contains not more than about 2.1% silicon.
6 . The alloy as claimed in claim 1 which contains at least about 3.7% nickel.
7 . The alloy as claimed in claim 6 which contains not more than about 4.2% nickel.
8 . The alloy as claimed in claim 1 which contains at least about 0.5% molybdenum.
9 . The alloy as claimed in claim 8 which contains not more than about 1.1% molybdenum.
10 . The alloy as claimed in claim 1 which contains at least about 1.2% chromium.
11 . The alloy as claimed in claim 10 which contains not more than about 1.35% chromium.
12 . The alloy as claimed in claim 1 wherein 6≦(% Si+% Cu)/% V≦12.
13 . A high strength, high toughness steel alloy having good temper resistance, said alloy comprising, in weight percent, about:
Carbon
0.37-0.45
Manganese
0.7-0.9
Silicon
1.3-2.1
Phosphorus
0.005 max.
Sulfur
0.0005 max.
Chromium
1.2-1.35
Nickel
3.7-4.2
Molybdenum
0.5-1.1
Copper
0.5-0.6
Cobalt
0.01 max.
Vanadium
0.25-0.35
the balance being iron and usual impurities, and wherein
6≦(% Si+% Cu)/% V≦12.
14 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
Carbon
0.35-0.5
Manganese
0.6-1.2
Silicon
1.3-2.5
Phosphorus
0.01 max.
Sulfur
0.001 max.
Chromium
1.0-1.5
Nickel
3.5-4.5
Molybdenum
0.4-1.3
Copper
0.5-0.6
Cobalt
0.01 max.
Vanadium
0.25-0.35
the balance being iron and usual impurities;
wherein 2≦(% Si+% Cu)/% V≦14;
said article having been tempered at a temperature of about 500° F. to 600° F.
15 . The alloy article as claimed in claim 14 which contains at least about 0.37% carbon.
16 . The alloy article as claimed in claim 15 which contains not more than about 0.45% carbon.
17 . The alloy article as claimed in claim 14 which contains at least about 1.3% silicon.
18 . The alloy article as claimed in claim 17 which contains not more than about 2.1% silicon.
19 . The alloy article as claimed in claim 14 which contains at least about 3.7% nickel.
20 . The alloy article as claimed in claim 19 which contains not more than about 4.2% nickel.
21 . The alloy article as claimed in claim 14 which contains at least about 0.5% molybdenum.
22 . The alloy article as claimed in claim 21 which contains not more than about 1.1% molybdenum.
23 . The alloy article as claimed in claim 14 which contains at least about 1.2% chromium.
24 . The alloy article as claimed in claim 23 which contains not more than about 1.35% chromium.
25 . The alloy article as claimed in claim 14 wherein 6≦(% Si+% Cu)/% V≦12.
26 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
Carbon
0.37-0.45
Manganese
0.7-0.9
Silicon
1.3-2.1
Phosphorus
0.005 max.
Sulfur
0.0005 max.
Chromium
1.2-1.35
Nickel
3.7-4.2
Molybdenum
0.5-1.1
Copper
0.5-0.6
Cobalt
0.01 max.
Vanadium
0.25-0.35
the balance being iron and usual impurities;
wherein 6≦(% Si+% Cu)/% V≦12;
said article having been tempered at a temperature of about 500° F. to 600° F.
27 . A high strength, high toughness steel alloy having good temper resistance, said alloy comprising, in weight percent, about:
C
0.35-0.55
Mn
0.6-1.2
Si
0.9-2.5
P
0.01 max.
S
0.001 max.
Cr
0.75-2.0
Ni
3.5-7.0
Mo + ½ W
0.4-1.3
Cu
0.5-0.6
Co
0.01 max.
V + ( 5/9) × Nb
0.2-1.0
the balance being iron and usual impurities, and wherein
2≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦14.
28 . The alloy as claimed in claim 27 which contains at least about 0.37% carbon.
29 . The alloy as claimed in claim 28 which contains not more than about 0.45% carbon.
30 . The alloy as claimed in claim 27 which contains at least about 1.3% silicon.
31 . The alloy as claimed in claim 30 which contains not more than about 2.1% silicon.
32 . The alloy as claimed in claim 27 which contains at least about 3.7% nickel.
33 . The alloy as claimed in claim 32 which contains not more than about 4.2% nickel.
34 . The alloy as claimed in claim 27 which contains at least about 0.5% molybdenum.
35 . The alloy as claimed in claim 34 which contains not more than about 1.1% molybdenum.
36 . The alloy as claimed in claim 27 which contains at least about 1.2% chromium.
37 . The alloy as claimed in claim 36 which contains not more than about 1.35% chromium.
38 . The alloy as claimed in claim 1 wherein 6≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦12.
39 . A high strength, high toughness steel alloy having good temper resistance, said alloy comprising, in weight percent, about:
C
0.37-0.50
Mn
0.7-0.9
Si
1.3-2.1
P
0.005 max.
S
0.0005 max.
Cr
1.0-1.5
Ni
3.7-4.5
Mo + ½ W
0.5-1.1
Cu
0.5-0.6
Co
0.01 max.
V + ( 5/9) × Nb
0.2-1.0
the balance being iron and usual impurities, and wherein
6≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦12.
40 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
C
0.35-0.55
Mn
0.6-1.2
Si
1.3-2.5
P
0.01 max.
S
0.001 max.
Cr
0.75-2.0
Ni
3.5-7.0
Mo + ½ W
0.4-1.3
Cu
0.5-0.6
Co
0.01 max.
V + ( 5/9) × Nb
0.2-1.0
the balance being iron and usual impurities;
wherein 2≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦14;
said article having been tempered at a temperature of about 500° F. to 600° F.
41 . The alloy article as claimed in claim 40 which contains at least about 0.37% carbon.
42 . The alloy article as claimed in claim 41 which contains not more than about 0.45% carbon.
43 . The alloy article as claimed in claim 40 which contains at least about 1.3% silicon.
44 . The alloy article as claimed in claim 43 which contains not more than about 2.1% silicon.
45 . The alloy article as claimed in claim 40 which contains at least about 3.7% nickel.
46 . The alloy article as claimed in claim 45 which contains not more than about 4.2% nickel.
47 . The alloy article as claimed in claim 40 which contains at least about 0.5% molybdenum.
48 . The alloy article as claimed in claim 47 which contains not more than about 1.1% molybdenum.
49 . The alloy article as claimed in claim 40 which contains at least about 1.2% chromium.
50 . The alloy article as claimed in claim 49 which contains not more than about 1.35% chromium.
51 . The alloy article as claimed in claim 40 wherein 6≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦12.
52 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
C
0.37-0.50
Mn
0.7-0.9
Si
1.3-2.1
P
0.005 max.
S
0.0005 max.
Cr
1.0-1.5
Ni
3.7-4.5
Mo + ½ W
0.5-1.1
Cu
0.5-0.6
Co
0.01 max.
V + ( 5/9) × Nb
0.2-1.0
the balance being iron and usual impurities;
wherein 6≦(% Si+% Cu)/(% V+(5/9)×% Nb)≦12;
said article having been tempered at a temperature of about 500° F. to 600° F.
53 . A high strength, high toughness steel alloy having good temper resistance, said alloy consisting essentially of, in weight percent, about:
C
0.35-0.50
Mn
0.6-1.2
Si
0.9-2.5
P
0.01 max.
S
0.001 max.
Cr
0.75-2.0
Ni
3.5-7.0
Mo
0.01 max.
W
0.8-2.6
Cu
0.5-0.6
Co
0.01 max.
Nb
0.2-1.0
V
0.01 max.
the balance being iron and usual impurities, and wherein
2≦(% Si+% Cu)/% Nb≦14.
54 . The alloy as claimed in claim 53 which contains at least about 0.37% carbon.
55 . The alloy as claimed in claim 54 which contains not more than about 0.45% carbon.
56 . The alloy as claimed in claim 53 which contains at least about 1.3% silicon.
57 . The alloy as claimed in claim 56 which contains not more than about 2.1% silicon.
58 . The alloy as claimed in claim 53 which contains at least about 3.7% nickel.
59 . The alloy as claimed in claim 58 which contains not more than about 4.2% nickel.
60 . The alloy as claimed in claim 59 which contains at least about 0.5% molybdenum.
61 . The alloy as claimed in claim 60 which contains not more than about 1.1% molybdenum.
62 . The alloy as claimed in claim 53 which contains at least about 1.0% tungsten.
63 . The alloy as claimed in claim 62 which contains not more than about 2.2% tungsten.
64 . The alloy as claimed in claim 53 which contains at least about 1.0% chromium.
65 . The alloy as claimed in claim 64 which contains not more than about 1.5% chromium.
66 . The alloy as claimed in claim 53 which contains at least about 0.2% niobium.
67 . The alloy as claimed in claim 66 which contains not more than about 1.0% niobium.
68 . The alloy as claimed in claim 53 wherein 6≦(% Si+% Cu)/% Nb≦12.
69 . A high strength, high toughness steel alloy having good temper resistance, said alloy consisting essentially of, in weight percent, about:
C
0.37-0.50
Mn
0.7-0.9
Si
1.3-2.1
P
0.005 max.
S
0.0005 max.
Cr
1.0-1.5
Ni
3.7-4.5
Mo
0.01 max.
W
1.0-2.2
Cu
0.5-0.6
Co
0.01 max.
Nb
0.2-1.0
V
0.01 max.
the balance being iron and usual impurities, and wherein
6≦(% Si+% Cu)/% Nb≦12.
70 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
C
0.35-0.55
Mn
0.6-1.2
Si
1.3-2.5
P
0.01 max.
S
0.001 max.
Cr
0.75-2.0
Ni
3.5-7.0
Mo
0.01 max.
W
0.8-2.6
Cu
0.5-0.6
Co
0.01 max.
Nb
0.2-1.0
V
0.01 max.
the balance being iron and usual impurities;
wherein 2≦(% Si+% Cu)/% Nb≦14;
said article having been tempered at a temperature of about 500° F. to 600° F.
71 . The alloy article as claimed in claim 70 which contains at least about 0.37% carbon.
72 . The alloy article as claimed in claim 71 which contains not more than about 0.45% carbon.
73 . The alloy article as claimed in claim 70 which contains at least about 1.3% silicon.
74 . The alloy article as claimed in claim 73 which contains not more than about 2.1% silicon.
75 . The alloy article as claimed in claim 70 which contains at least about 3.7% nickel.
76 . The alloy article as claimed in claim 75 which contains not more than about 4.2% nickel.
77 . The alloy article as claimed in claim 70 which contains at least about 0.5% molybdenum.
78 . The alloy article as claimed in claim 77 which contains not more than about 1.1% molybdenum.
79 . The alloy article as claimed in claim 70 which contains at least about 1.0% tungsten.
80 . The alloy article as claimed in claim 79 which contains not more than about 2.2% tungsten.
81 . The alloy article as claimed in claim 70 which contains at least about 1.0% chromium.
82 . The alloy article as claimed in claim 81 which contains not more than about 1.5% chromium.
83 . The alloy article as claimed in claim 70 which contains at least about 0.2% niobium.
84 . The alloy article as claimed in claim 83 which contains not more than about 1.0% niobium.
85 . The alloy article as claimed in claim 70 wherein 6≦(% Si+% Cu)/% Nb≦12.
86 . A hardened and tempered alloy article that has very high strength and fracture toughness, said article comprising an alloy consisting essentially of, in weight percent, about
C
0.37-0.50
Mn
0.7-0.9
Si
1.3-2.1
P
0.005 max.
S
0.0005 max.
Cr
1.0-1.5
Ni
3.7-4.5
Mo
0.01 max.
W
1.0-2.2
Cu
0.5-0.6
Co
0.01 max.
Nb
0.2-1.0
V
0.01 max.
the balance being iron and usual impurities;
wherein 6≦(% Si+% Cu)/% Nb≦12;
said article having been tempered at a temperature of about 500° F. to 600° F.Join the waitlist — get patent alerts
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