US3932175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium, molybdenum ferritic stainless steels
Assignee: EIDP Inc
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Filing: 1971-03-09
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Granted: 1976-01-13
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Expires: 1991-03-09
Abstract
Abstract A ferritic alloy containing, in general ranges, 22-35% chromium, 1.8-6.2% molybdenum, 100 ppm carbon maximum, 200 ppm nitrogen maximum, the sum of carbon plus nitrogen being 250 ppm maximum, having inherent post-welding ductility and high corrosion resistance.
Inventors
- 👤 Michael A. Streicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:05
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/082; F28F21/083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy having good post-welding ductility consisting essentially of chromium and molybdenum in the weight percentages within areas A 1 , A 2 , B, C 1 , C 2 and D of FIG. 1, carbon 100 ppm maximum, nitrogen 200 ppm maximum, and carbon plus nitrogen 250 ppm maximum, the balance being iron and incidental impurities.
Claim 2
Dependent Claim
60 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy having good post-welding ductility consisting essentially of chromium and molybdenum in the weight percentages within areas A 1 , A 2 , B, C 1 , C 2 and D of FIG. 1, carbon 100 ppm maximum, nitrogen 200 ppm maximum, and carbon plus nitrogen 250 ppm maximum, the balance being iron and incidental impurities.
Claim 3
Dependent Claim
15 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 incorporating 28.5-30.5% Cr and 3.5-4.5% Mo.
Claim 4
Dependent Claim
29 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 wherein said chromium and molybdenum are incorporated in weight percentages within areas A 1 and A 2 of FIG. 1.
Claim 5
Dependent Claim
25 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 wherein said chromium and molybdenum are incorporated in weight percentages within area B of FIG. 1.
Claim 6
Dependent Claim
15 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 4 incorporating 32-34% Cr and 2.75-3.75% Mo.
Claim 7
Dependent Claim
29 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 wherein said chromium and molybdenum are incorporated in weight percentages within areas C 1 and C 2 of FIG. 1.
Claim 8
Dependent Claim
25 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 wherein said chromium and molybdenum are incorporated in weight percentages within area D of FIG. 1.
Claim 9
Dependent Claim
49 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 wherein said chromium and molybdenum are incorporated in weight percentages within areas A 1 , A 2 , B, C 1 , C 2 and D of FIG. 1, including, additionally, up to 1% Mn and up to 1% Si.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |