US4256486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Martensitic stainless steel having excellent weldability and workability for structural use
Assignee: JFE Steel Corp
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Filing: 1979-07-31
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Granted: 1981-03-17
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Expires: 1999-07-31
Abstract
Abstract Martensitic stainless steel having excellent weldability and workability for structural use is obtained by limiting each content of carbon and nitrogen to the low value less than 0.02% and the content of nickel to less than 0.1% and by satisfying the following requirement. Cr equivalent=[%Cr]+0.4×[%Si]-0.4×[%Mn]-0.7×[%Ni]-0.6.times.[%Cu]-35×[%C]-10×[%N]≦10.5, wherein % means weight % of the element in steel.
Inventors
- 👤 Keiichi Yoshioka
- 👤 Noboru Kinoshita
- 👤 Yutaka Ono
- 👤 Nobuo Ohashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:09
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
Martensitic stainless steel having excellent weldability and workability for structural use consisting of not more than 0.02% of C, not more than 0.02% of N, 1.0-3.5% of Mn, not more than 1.0% of Cu, less than 0.1% of Ni, 10-13.5% of Cr, not more than 0.5% of Si, and the remainder being incidental impurities and iron and the following requirement being satisfied; Cr equivalent=[%Cr]+0.4×[%Si]-0.4×[%Mn]-0.7×[%Ni]-0.6.times.[%Cu]-35×[%C]-10×[%N]≦10.5.
Claim 2
Dependent Claim
64 words
Martensitic stainless steel having excellent weldability and workability for structural use consisting of not more than 0.02% of C, not more than 0.02% of N, 1.0-3.5% of Mn, not more than 1.0% of Cu, less than 0.1% of Ni, 10-13.5% of Cr, not more than 0.5% of Si, and the remainder being incidental impurities and iron and the following requirement being satisfied; Cr equivalent=[%Cr]+0.4×[%Si]-0.4×[%Mn]-0.7×[%Ni]-0.6.times.[%Cu]-35×[%C]-10×[%N]≦10.5.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |