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US4797252A
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Corrosion-resistant, low-carbon plus nitrogen austenitic stainless steels with improved machinability
Assignee: Crucible Materials Corp
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Filing: 1986-09-19
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Granted: 1989-01-10
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Expires: 2006-09-19
Abstract
Abstract A free-machining, austenitic stainless steel having low carbon plus nitrogen contents in combination with manganese and sulfur additions. The steel may have silicon of 0.045 to 1.00 percent.
Inventors
- 👤 John J. Eckenrod
- 👤 Geoffrey O. Rhodes
- 👤 Kenneth E. Pinnow
- 👤 William E. Royer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:18
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A corrosion resistance fully austenitic stainless steel having improved machinability consisting essntially of, in weight percent, carbon plus nitrogen up to about 0.052, chromium 16 to 20, nickel 8 to 12, sulfur 0.026 to 0.07, manganese up to 2.0, silicon up to 1.0, phosphorus up to 0.05, molybdenum up to 3.0, copper up to 1.0 and the balance iron with incidental impurities.
Claim 2
Dependent Claim
62 words
A corrosion resistance fully austenitic stainless steel having improved machinability consisting essntially of, in weight percent, carbon plus nitrogen up to about 0.052, chromium 16 to 20, nickel 8 to 12, sulfur 0.026 to 0.07, manganese up to 2.0, silicon up to 1.0, phosphorus up to 0.05, molybdenum up to 3.0, copper up to 1.0 and the balance iron with incidental impurities.
Claim 3
Dependent Claim
10 words
The steel of claim 1 having silicon 0.45 to 0.75.
Claim 4
Dependent Claim
15 words
The steel of claim 1 having silicon 0.45 to 0.75 and sulfur 0.04 and 0.07.
Claim 5
Dependent Claim
14 words
The steels of claims 2 or 3 having carbon plus nitrogen up to 0.040.
Claim 6
Dependent Claim
18 words
The steels of claims 1, 2 or 3 having chromium 18 to 20 and molybdenum up to 1.0.
Claim 7
Dependent Claim
18 words
The steels of claims 1, 2 or 3 having chromium 16 to 18 and molybdenum 2 to 3.
Claim 8
Dependent Claim
15 words
The steel of claim 4 having chromium 18 to 20 and molybdenum up to 1.0.
Claim 9
Dependent Claim
15 words
The steel of claim 4 having chromium 16 to 18, and molybdenum 2 to 3.
Claim 10
Dependent Claim
64 words
A continuously cast and wrought fully austenitic stainless steel product having improved machinability consisting essentially of, in weight percent, carbon plus nitrogen up to 0.052, chromium 16 to 20, nickel 8 to 12, sulfur 0.02 to 0.07, manganese up to 2.0, silicon up to 1.0, phosphorus up to 0.05, molybdenum up to 3.0, copper up to 1.0, and the balance iron and incidental impurities.
Claim 11
Dependent Claim
64 words
A continuously cast and wrought fully austenitic stainless steel product having improved machinability consisting essentially of, in weight percent, carbon plus nitrogen up to 0.052, chromium 16 to 20, nickel 8 to 12, sulfur 0.02 to 0.07, manganese up to 2.0, silicon up to 1.0, phosphorus up to 0.05, molybdenum up to 3.0, copper up to 1.0, and the balance iron and incidental impurities.
Claim 12
Dependent Claim
13 words
The austenitic stainless steel product of claim 9 having silicon 0.45 to 0.75.
Claim 13
Dependent Claim
13 words
The austenitic stainless steel product of claim 9 having silicon 0.45 to 0.75.
Claim 14
Dependent Claim
17 words
The austenitic stainless steel product of claim 10 or 11 having carbon plus nitrogen up to 0.040.
Claim 15
Dependent Claim
21 words
The austenitic stainless steel product of claims 9, 10 or 11 having chromium 18 to 20 and molybdenum up to 1.0.
Claim 16
Dependent Claim
21 words
The austenitic stainless steel product of claims 9, 10 or 11 having chromium 16 to 18 and molybdenum 2 to 3.
Claim 17
Dependent Claim
18 words
The austenitic stainless steel product of claim 12 having chromium 18 to 20 and molybdenum up to 1.0.
Claim 18
Dependent Claim
17 words
The austenitic stainless steel product of claim 12 havingchromium 16 to 18 and molybdenum 2 to 3.
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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |