US4465525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferritic stainless steel having excellent formability
Assignee: Nippon Steel Corp
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Filing: 1982-12-28
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Granted: 1984-08-14
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Expires: 2002-12-28
Abstract
Abstract A ferritic stainless steel having excellent formability, for example, in a deep drawing procedure, contains 0.04 to 0.1 weight % of C, 1.0 weight % or less of Si, 0.75 weight % or less of Mn, 10 to 30 weight % of Cr, 0.5 weight % or less of Ni, 0.025 weight % or les of N, 2 to 30 ppm of boron, and optionally, 0.005 to 0.4 weight % of an additional alloy component consisting of Al and, further optionally, a further additional alloy component consisting of at least one member selected from 0.005 to 0.6 weight % of Ti, 0.005 to 0.4 weight % of Nb, V, and Zr, 0.02 to 0.50 weight % of Cu, and 0.05 weight % or less of Ca and Ce, the sum of the contents of C and N being 0.0502 weight % or more.
Inventors
- 👤 Hirofumi Yoshimura
- 👤 Mitsuo Ishii
- 👤 Tadashi Sawatani
- 👤 Shigeru Minamino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:06
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A ferritic stainless steel having an excellent formability, which consists essentially of: 0.04% to 0.1% by weight of carbon, 1.0% by weight or less of silicon, 0.75% by weight of less of manganese, 10% to 30% by weight of chromium, 0.5% by weight or less of nickel, 0.0102% to 0.025% by weight of nitrogen, 2 to 30 ppm of boron, and the balance consisting of iron and unavoidable impurities, the sum of the contents of nitrogen and carbon being 0.0502 % by weight or more.
Claim 2
Dependent Claim
85 words
A ferritic stainless steel having an excellent formability, which consists essentially of: 0.04% to 0.1% by weight of carbon, 1.0% by weight or less of silicon, 0.75% by weight of less of manganese, 10% to 30% by weight of chromium, 0.5% by weight or less of nickel, 0.0102% to 0.025% by weight of nitrogen, 2 to 30 ppm of boron, and the balance consisting of iron and unavoidable impurities, the sum of the contents of nitrogen and carbon being 0.0502 % by weight or more.
Claim 3
Dependent Claim
31 words
The ferritic stainless steel as claimed in claim 1, wherein the content of nitrogen is up to 0.014% by weight, and the content of carbon is up to 0.07% by weight.
Claim 4
Dependent Claim
50 words
The ferritic stainless steel as claimed in claim 1, wherein the content of silicon is 0.20% to 0.90% by weight, the content of manganese is 0.05% to 0.65% by weight, the content of nickel is 0.01% to 0.30% by weight, and the content of boron is 5 to 25 ppm.
Claim 5
Dependent Claim
25 words
The ferritic stainless steel as claimed in claim 1, which contains an additional alloy component consisting of from 0.005% to 0.4% by weight of aluminum.
Claim 6
Dependent Claim
77 words
The ferritic stainless steel as claimed in claim 4, which contains a further alloy component consisting of at least one number selected from the group consisting of 0.005% to 0.6% by weight of titanium, 0.005% to 0.4% by weight of niobium, 0.005% to 0.4% by weight of vanadium, 0.005% to 0.4% by weight of zirconium, 0.02% to 0.50% by weight of copper, 0.05% by weight or less of calcium, and 0.05% by weight or less of cerium.
References Cited (Backward Citations)
US2590835A
Cited
US2848323A
Cited
US3778316A
Cited
US3753788A
Cited
US3856515A
Cited
US3957544A
Cited
US3890143A
Cited
US4155752A
Cited
JPS55717A
Cited
GB2071148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |