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US4613367A
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US
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Low carbon plus nitrogen, free-machining austenitic stainless steel
Assignee: Crucible Materials Corp
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Filing: 1985-06-14
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Granted: 1986-09-23
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Expires: 2005-06-14
Abstract
Abstract A chromium-nickel austenitic stainless steel having improved machinability resulting from low carbon and nitrogen contents, along with a high manganese to sulfur ratio. The composition of the steel consists essentially of, in weight percent, carbon plus nitrogen up to 0.060, preferably up to 0.049, and most preferred up to 0.032, chromium 16 to 30, preferred 17 to 19, nickel 5 to 26, preferred 6 to 14, sulfur 0.25 to 0.45, manganese over 2 to about 7 and at least about eight times the sulfur content, balance iron and incidental impurities.
Inventors
- 👤 John J. Eckenrod
- 👤 Kenneth E. Pinnow
- 👤 Geoffrey O. Rhodes
- 👤 William E. Royer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:30
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58; C22C38/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A free-machining, austentic stainless steel consisting of, in weight percent, carbon plus nitrogen both present having a total of up to 0.060 chromium 16 to 30 nickel 5 to 26 sulfur 0.25 to 0.45 manganese over 2 to about 7 and is at least about 8 times the sulfur content silicon up to about 1 phosphorous up to about 0.50 molybdenum up to about 0.60 iron balance with incidental impurities.
Claim 2
Dependent Claim
70 words
A free-machining, austentic stainless steel consisting of, in weight percent, carbon plus nitrogen both present having a total of up to 0.060 chromium 16 to 30 nickel 5 to 26 sulfur 0.25 to 0.45 manganese over 2 to about 7 and is at least about 8 times the sulfur content silicon up to about 1 phosphorous up to about 0.50 molybdenum up to about 0.60 iron balance with incidental impurities.
Claim 3
Dependent Claim
12 words
The steel of claim 1 having carbon plus nitrogen up to 0.049.
Claim 4
Dependent Claim
12 words
The steel of claim 1 having carbon plus nitrogen up to 0.032.
Claim 5
Dependent Claim
66 words
A free-machining, austentic stainless steel consisting of, in weight precent, carbon plus nitrogen both present having a total of up to 0.060 chromium 17 to 19 nickel 6 to 14 sulfur 0.25 to 0.45 silicon up to about 1 molybdenum up to about 0.60 manganese from over 2 to about 7 percent and is at least 8 times the sulfur content iron balance with incidental impurities.
Claim 6
Dependent Claim
66 words
A free-machining, austentic stainless steel consisting of, in weight precent, carbon plus nitrogen both present having a total of up to 0.060 chromium 17 to 19 nickel 6 to 14 sulfur 0.25 to 0.45 silicon up to about 1 molybdenum up to about 0.60 manganese from over 2 to about 7 percent and is at least 8 times the sulfur content iron balance with incidental impurities.
Claim 7
Dependent Claim
12 words
The steel of claim 4 having carbon plus nitrogen up to 0.049.
Claim 8
Dependent Claim
12 words
The steel of claim 4 having carbon plus nitrogen up to 0.032.
Claim 9
Dependent Claim
10 words
The steel of claim 4 having nickel 6.5 to 10.
Claim 10
Dependent Claim
12 words
The steel of claim 7 having carbon plus nitrogen up to 0.049.
Claim 11
Dependent Claim
12 words
The steel of claim 7 having carbon plus nitrogen up to 0.032.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |