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US4172716A
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Stainless steel having excellent pitting corrosion resistance and hot workabilities
Assignee: Nippon Steel Corp
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Filing: 1978-09-28
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Granted: 1979-10-30
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Expires: 1998-09-28
Abstract
Abstract A stainless steel having excellent pitting corrosion resistance and hot workability which comprises 0.001 to 0.20% (by weight) of C, 0.1 to 6.0% of Si, 0.1 to 10.0% of Mn, 15 to 35% of Cr, 3.5 to 35.0% of Ni, 0.01 to 6.0% of Mo (Si+Cr+Ni+Mo>/=25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, and 0.001 to 0.02% of Ca with the balance being iron and unavoidable impurities.
Inventors
- 👤 Hideo Abo
- 👤 Masanori Ueda
- 👤 Sakae Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:42
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58; C22C38/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A stainless steel having excellent pitting corrosion resistance and hot workability consisting of 0.001 to 0.20% (by weight) of C, 0.1 to 6.0% of Si, 0.1 to 10.0% of Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, and 0.001 to 0.02% of Ca with the balance being iron and unavoidable impurities.
Claim 2
Dependent Claim
70 words
A stainless steel having excellent pitting corrosion resistance and hot workability consisting of 0.001 to 0.20% (by weight) of C, 0.1 to 6.0% of Si, 0.1 to 10.0% of Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, and 0.001 to 0.02% of Ca with the balance being iron and unavoidable impurities.
Claim 3
Dependent Claim
83 words
A stainless steel having excellent pitting corrosion resistance and hot workability, consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% of Mn, 17 to 27% of Cr 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca, and one or two of 0.1 to 4.0% of Cu, and 0.1 to 2.0% of Nb, with the balance being iron and unavoidable impurities.
Claim 4
Dependent Claim
83 words
A stainless steel having excellent pitting corrosion resistance and hot workability, consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% of Mn, 17 to 27% of Cr 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca, and one or two of 0.1 to 4.0% of Cu, and 0.1 to 2.0% of Nb, with the balance being iron and unavoidable impurities.
Claim 5
Dependent Claim
72 words
A stainless steel having excellent pitting corrosion resistance and hot workabilities, consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo, (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca and 0.001 to 0.2% of B with the balance being iron and unavoidable impurities.
Claim 6
Dependent Claim
72 words
A stainless steel having excellent pitting corrosion resistance and hot workabilities, consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo, (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca and 0.001 to 0.2% of B with the balance being iron and unavoidable impurities.
Claim 7
Dependent Claim
87 words
A stainless steel having excellent pitting corrosion resistance and hot workabilities consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo, (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca, 0.001 to 0.2% of B, and one or two of 0.1 to 4.0% of Cu, and 0.1 to 2.0% of Nb with the balance being iron and unavoidable impurities.
Claim 8
Dependent Claim
87 words
A stainless steel having excellent pitting corrosion resistance and hot workabilities consisting of 0.001 to 0.20% of C, 0.1 to 6.0% of Si, 0.1 to 10.0% Mn, 17 to 27% of Cr, 10.0 to 20.0% of Ni, 0.01 to 6.0% of Mo, (Si+Cr+Ni+Mo≧25%), 0.001 to 0.50% of N, 0.01 to 0.07% of Al, 0.001 to 0.02% of Ca, 0.001 to 0.2% of B, and one or two of 0.1 to 4.0% of Cu, and 0.1 to 2.0% of Nb 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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |