US4078920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Austenitic stainless steel with high molybdenum content
Assignee: Outokumpu Stainless AB
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Filing: 1977-01-28
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Granted: 1978-03-14
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Expires: 1997-01-28
Abstract
Abstract An austenitic stainless steel alloy having a high molybdenum content consisting essentially of up to 0.08% carbon, 0.01-0.8% silicon, 0.2-2.0% manganese, 17-25% chromium, 15-21% nickel, 6-10% molybdenum, 0.06-0.25% nitrogen and 0-2.0% copper and the balance of the contents of said alloy being iron with residual impurities. The alloys of the present invention have improved corrosion resistance and improved hot and cold ductility.
Inventors
- 👤 Mats Liljas
- 👤 Jan Ingemar Fridberg
- 👤 Hasse Sigverd Fredriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:14
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
An austenitic stainless steel alloy having good hot workability and pit corrosion resistance, consisting essentially of about 6% to 10% molybdenum, 17% to 25% chromium, 15% to 21% nickel, up to 0.080% carbon, 0.2% to 2% manganese, 0.1% to 0.8% silicon, 0% to 2% copper, 0.06% to 0.25% nitrogen, and the remainder essentially being all iron, wherein the nickel content is adjusted in relation to the other aforementioned elements in order that the alloy is solidified from is melt phase a ferrite-austenite and wherein the contents of said alloy satisfy the equation: ##EQU2##
Claim 2
Dependent Claim
93 words
An austenitic stainless steel alloy having good hot workability and pit corrosion resistance, consisting essentially of about 6% to 10% molybdenum, 17% to 25% chromium, 15% to 21% nickel, up to 0.080% carbon, 0.2% to 2% manganese, 0.1% to 0.8% silicon, 0% to 2% copper, 0.06% to 0.25% nitrogen, and the remainder essentially being all iron, wherein the nickel content is adjusted in relation to the other aforementioned elements in order that the alloy is solidified from is melt phase a ferrite-austenite and wherein the contents of said alloy satisfy the equation: ##EQU2##
Claim 3
Dependent Claim
42 words
An alloy according to claim 1 having from about 0.005% to 0.030% carbon, 0.2% to 1.0% manganese, 0.3% to 0.5% silicon, 0.06% to 0.22% nitrogen, 17.0% to 25.0% chromium, 6.0% to 10.0% molybdenum, 0.4% to 1.2% copper and 15.0% to 21.0% nickel.
Claim 4
Dependent Claim
31 words
An alloy according to claim 1, wherein cerium is present in an amount no greater than about 0.10% and originating from the addition of mish metal to the alloy melt phase.
Claim 5
Dependent Claim
17 words
An alloy according to claim 3, wherein the amount of cerium is from about 0.01% to 0.06%.
Claim 6
Dependent Claim
32 words
An alloy according to claim 1, wherein either or both of the elements aluminum and boron is (are) present in the amount of about 0.01% to 0.3% and 0.0001% to 0.01%, respectively.
Claim 7
Dependent Claim
32 words
An alloy according to claim 3, wherein either or both of the elements aluminum and boron is (are) present in the amount of about 0.01% to 0.3% and 0.0001% to 0.1%, respectively.
Claim 8
Dependent Claim
32 words
An alloy according to claim 1, wherein one or more of the carbide forming elements Nb, Ta, Ti, V, W and Zr is (are) present in a total amount up to 1.0%.
Claim 9
Dependent Claim
32 words
An alloy according to claim 3, wherein one or more of the carbide forming elements Nb, Ta, Ti, V, W and Zr is (are) present in a total amount up to 1.0%.
Claim 10
Dependent Claim
32 words
An alloy according to claim 5, wherein one or more of the carbide forming elements Nb, Ta, Ti, V, W and Zr is (are) present in a total amount up to 1.0%.
References Cited (Backward Citations)
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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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |