US4036640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy steel
Assignee: CRS Holdings LLC
•
Filing: 1977-01-06
•
Granted: 1977-07-19
•
Expires: 1997-01-06
Abstract
Abstract An alloy steel is provided containing, by weight percent, carbon 0.5-1.1, manganese 0.10-<0.50, silicon 0.10-<0.80, chromium 3.5-5.0, molybdenum 2.5-5.0, vanadium 0.5-2.0, cobalt 0.5-4.0, columbium 0.15-0.50, up to 0.10 aluminum and the balance iron except for incidental impurities. The alloy can be balanced to provide a minimum room temperature hardness of R c 60 with outstanding toughness and ductility or to provide a minimum room temperature hardness of R c 63 with good wear resistance and toughness.
Inventors
- 👤 Thoni V. Philip
- 👤 Gunvant N. Maniar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:10
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; C22C38/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
An alloy steel, which is hardenable by heating up to about 2150° F. while retaining a Snyder-Graff grain size of 9 or finer and tempered to a room temperature hardness of at least about R c 60, which in its heat treated condition is substantially free of retained austenite, which by weight consists essentially of about ______________________________________
w/o
______________________________________
Carbon 0.5-1.1
Manganese 0.10-<0.50
Silicon 0.10-<0.80
Chromium 3.5-5.0
Molybdenum 2.5-5.0
Vanadium 0.5-2.0
Cobalt 0.5-4.0
Columbium 0.15-0.50
Aluminum up to 0.10
______________________________________ and the balance essentially iron and incidental impurities.
Claim 2
Dependent Claim
88 words
An alloy steel, which is hardenable by heating up to about 2150° F. while retaining a Snyder-Graff grain size of 9 or finer and tempered to a room temperature hardness of at least about R c 60, which in its heat treated condition is substantially free of retained austenite, which by weight consists essentially of about ______________________________________
w/o
______________________________________
Carbon 0.5-1.1
Manganese 0.10-<0.50
Silicon 0.10-<0.80
Chromium 3.5-5.0
Molybdenum 2.5-5.0
Vanadium 0.5-2.0
Cobalt 0.5-4.0
Columbium 0.15-0.50
Aluminum up to 0.10
______________________________________ and the balance essentially iron and incidental impurities.
Claim 3
Dependent Claim
20 words
The alloy steel set forth in claim 1 containing up to about 0.70% carbon and at least about 1.25% cobalt.
Claim 4
Dependent Claim
11 words
The alloy steel set forth in claim 2 containing 0.10-0.40% silicon.
Claim 5
Dependent Claim
11 words
The alloy steel set forth in claim 3 containing 0.5-1.0% vanadium.
Claim 6
Dependent Claim
11 words
The alloy steel set forth in claim 3 containing 3.75-4.5% chromium.
Claim 7
Dependent Claim
94 words
The alloy steel set forth in claim 1 containing about ______________________________________
w/o
______________________________________
Carbon 0.5 - 0.70
Manganese 0.15 - 0.30
Silicon 0.10 - 0.40
Chromium 3.5 - 5.0
Molybdenum 2.50 - 3.25
Vanadium 0.5 - 0.8
Cobalt 1.25 - 2.75
Columbium 0.15 - 0.50
______________________________________ said alloy steel having an ultimate tensile strength of at least about 350 ksi with a minimum elongation of 3% in a gage length equal to 4 times its diameter and a minimum reduction in area of 5%, and having a minimum unnotched Izod toughness of 50 ft-lb.
Claim 8
Dependent Claim
38 words
The alloy steel set forth in claim 6 containing about ______________________________________
w/o
______________________________________
Carbon 0.53 - 0.60
Chromium 3.75 - 4.5
Molybdenum 2.70 - 3.10
Vanadium 0.7 - 0.8
Cobalt 1.5 - 2.5
Columbium 0.20 - 0.30
______________________________________
Claim 9
Dependent Claim
25 words
The alloy steel set forth in claim 1 containing at least about 0.75% carbon, at least about 0.35% silicon, and at least about 0.7% vanadium.
Claim 10
Dependent Claim
14 words
The alloy steel set forth in claim 8 containing at least about 3.5% molybdenum.
Claim 11
Dependent Claim
66 words
The alloy steel set forth in claim 1 containing about ______________________________________
w/o
______________________________________
Carbon 0.75 - 1.1
Manganese 0.10 - <0.50
Silicon 0.35 - 0.75
Chromium 3.5 - 5.0
Molybdenum 3.5 - 5.0
Vanadium 0.7 - 2.0
Cobalt 0.5 - 4.0
Columbium 0.15 - 0.50
______________________________________ said alloy steel being balanced so as to have a room temperature hardness of at least about R c 63.
Claim 12
Dependent Claim
61 words
The alloy steel set forth in claim 9 containing about ______________________________________
w/o
______________________________________
Carbon 0.82 - 0.90
Manganese 0.15 - 0.35
Silicon 0.5 - 0.6
Chromium 3.75 - 4.5
Molybdenum 4.0 - 4.5
Vanadium 0.9 - 1.1
Cobalt 1.5 - 2.5
Columbium 0.20 - 0.35
______________________________________
said alloy steel having a room temperature heat-treated hardness of at
least about R.sub.c 63.
Claim 13
Dependent Claim
86 words
The alloy steel set forth in claim 1 containing about ______________________________________
w/o
______________________________________
Carbon 0.75 - 1.10
Manganese 0.10 - <0.50
Silicon 0.35 - <0.80
Chromium 3.5 - 5.0
Molybdenum 3.5 - 5.0
Vanadium 0.7 - 2.0
Cobalt 0.5 - 4.0
Columbium 0.15 - 0.50
______________________________________
in which the elements cobalt, silicon and molybdenum are balanced to
satisfy the relationship 1 × %Co + 13.3 × %Si + 2.05 × %Mo ≮ 16 and has a heat-treated room temperature hardness of at least R c 63.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |