US4059440A
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US
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Highly corrosion resistant ferritic stainless steel
Assignee: Nippon Steel Corp
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Filing: 1976-01-27
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Granted: 1977-11-22
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Expires: 1996-01-27
Abstract
Abstract A highly corrosion resistant ferritic stainless steel comprising; C </= 0.
Inventors
- 👤 Susumu Takemura
- 👤 Masao Onoyama
- 👤 Masanobu Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:56
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26; C22C38/22; C22C38/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A stable, highly corrosion resistant single phase ferritic stainless steel consisting essentially of the following components: C ≦ 0.015% si ≦ 0.30% Mn ≦ 0.30% P ≦ 0.040% s ≦ 0.030% cr : 18.00 to 25.00% Ni ≦ 0.20% Cu ≦ 0.20% Mo : 1.50 - 3.50% N ≦ 0.015% ti : 4 × (C + N)% to 0.50%, and Nb : 8 × (C + N)% to 1.00%, wherein Ti/Nb : 0.5 to 1.2 (Ti + Nb)/(C + N) ≧ 8.0 in case of (C + N) < 0.017%, and (Ti + Nb)/(C + N) ≧ 16.0 in case of (C + N) ≧ 0.017% with the balance being iron and unavoidable impurities.
Claim 2
Dependent Claim
114 words
A stable, highly corrosion resistant single phase ferritic stainless steel consisting essentially of the following components: C ≦ 0.015% si ≦ 0.30% Mn ≦ 0.30% P ≦ 0.040% s ≦ 0.030% cr : 18.00 to 25.00% Ni ≦ 0.20% Cu ≦ 0.20% Mo : 1.50 - 3.50% N ≦ 0.015% ti : 4 × (C + N)% to 0.50%, and Nb : 8 × (C + N)% to 1.00%, wherein Ti/Nb : 0.5 to 1.2 (Ti + Nb)/(C + N) ≧ 8.0 in case of (C + N) < 0.017%, and (Ti + Nb)/(C + N) ≧ 16.0 in case of (C + N) ≧ 0.017% with the balance being iron and unavoidable impurities.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |