US4219356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machinable ferritic stainless steels
Assignee: Daido Steel Co Ltd
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Filing: 1978-09-13
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Granted: 1980-08-26
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Expires: 1998-09-13
Abstract
Abstract Machinable ferrite stainless steels having an excellent corrosion resistance, consisting of not more than 0.030% of C, not more than 0.050% of N, not more than 0.012% of O, not more than 0.8% of Si, not more than 1.6% of Mn, 0.05-0.40% of S, 16-22% of Cr, and 1-3% of Mo, or at least one of 0.03-0.25% of Pb, 0.03-0.20% of Se and 0.01-0.15% of Te, the remainder being Fe, provided that the sum of C and N is not more than 0.060% and Mn/S is 2-5, characterized by that Cr content based on 100 parts by weight of sulfide inclusions formed in the said steels is 10-50 parts by weight.
Inventors
- 👤 Tatsuo Fujiwara
- 👤 Shozo Abeyama
- 👤 Kiyohito Ishida
- 👤 Sadayuki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:50
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
Machinable ferrite stainless steels consisting of not more than 0.030% of C, not more than 0.050% of N, not more than 0.012% of O, not more than 0.8% of Si, not more than 1.6% of Mn, 0.05-0.40% of S, 16-22% of Cr, 1-3% of Mo, the remainder being Fe, provided that the sum of C and N is not more than 0.060% and Mn/S is 2-5, characterized in that Cr content based on 100 parts by weight of sulfide inclusions formed in the said steels is 10-50 parts by weight.
Claim 2
Dependent Claim
90 words
Machinable ferrite stainless steels consisting of not more than 0.030% of C, not more than 0.050% of N, not more than 0.012% of O, not more than 0.8% of Si, not more than 1.6% of Mn, 0.05-0.40% of S, 16-22% of Cr, 1-3% of Mo, the remainder being Fe, provided that the sum of C and N is not more than 0.060% and Mn/S is 2-5, characterized in that Cr content based on 100 parts by weight of sulfide inclusions formed in the said steels is 10-50 parts by weight.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |