US3895939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weldable, age hardenable, austenitic stainless steel
Assignee: United States Department of Energy
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Filing: 1973-10-31
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Granted: 1975-07-22
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Expires: 1993-10-31
Abstract
Abstract An age hardenable, austenitic stainless steel having superior weldability properties as well as resistance to degradation of properties in a hydrogen atmosphere has a composition of from about 24.0 to about 34.0 weight percent (w/o) nickel, from about 13.5 to about 16.0 w/o chromium, from about 1.9 to about 2.3 w/o titanium, from about 1.0 to about 1.5 w/o molybdenum, from about 0.01 to about 0.05 w/o carbon, from about 0 to about 0.25 w/o manganese, from about 0 to about 0.01 w/o phosphorous and preferably about 0.005 w/o maximum, from about 0 to about 0.010 w/o sulfur and preferably about 0.005 w/o maximum, from about 0 to about 0.25 w/o silicon, from about 0.1 to about 0.35 w/o aluminum, from about 0.10 to about 0.50 w/o vanadium, from about 0 to about 0.0015 w/o boron, and the balance essentially iron.
Inventors
- 👤 John A Brooks
- 👤 Robert W Krenzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A STAINLESS STEEL FOR USE IN HYDROGEN ENVIROMENT WITH GOOD RETENTION OF PROPERTIES HAVING HIGH WELDABILITY AND MINIMUM SUSCEPTIBILITY TO HOT CRACKING DURING WELDING CONSISTING OF FROM ABOUT 0 TO ABOUT 0.0015 WEIGHT PERCENT BORON, FROM ABOUT 0 TO ABOUT 0.25 WEIGHT PERCENT SILICON, FROM ABOUT 0 TO ABOUT 0.25 WEIGHT PERCENT MANGANESE, FROM ABOUT 0.01 TO ABOUT 0.05 WEIGHT PERCENT CARBON, AND THE REMAINDER CONSISTING OF FROM ABOUT 24.0 TO ABOUT 34.0 WEIGHT PERCENT NICKEL, FROM ABOUT 13.5 TO ABOUT 16.0 WEIGHT PERCENT CHROMIUM, FROM ABOUT 1.9 TO ABOUT 2.3 WEIGHT PERCENT TITANIUM, FROM ABOUT 1.0 TO ABOUT 1.5 WEIGHT PERCENT MOLYBDENUM, FROM ABOUT ABOUT 0.01 WEIGHT PERCENT PHOSPHOROUS, FROM ABOUT 0 TO ABOUT 0.010 WEIGHT PERCENT SULFUR, FROM ABOUT 0.1 TO ABOUT 0.35 WEIGHT PERCENT SULFUR, FROM ABOUT 0.1 TO ABOUT WEIGHT PERCENT VANADIUM, AND THE BALANCE IRON.
Claim 2
Dependent Claim
140 words
A STAINLESS STEEL FOR USE IN HYDROGEN ENVIROMENT WITH GOOD RETENTION OF PROPERTIES HAVING HIGH WELDABILITY AND MINIMUM SUSCEPTIBILITY TO HOT CRACKING DURING WELDING CONSISTING OF FROM ABOUT 0 TO ABOUT 0.0015 WEIGHT PERCENT BORON, FROM ABOUT 0 TO ABOUT 0.25 WEIGHT PERCENT SILICON, FROM ABOUT 0 TO ABOUT 0.25 WEIGHT PERCENT MANGANESE, FROM ABOUT 0.01 TO ABOUT 0.05 WEIGHT PERCENT CARBON, AND THE REMAINDER CONSISTING OF FROM ABOUT 24.0 TO ABOUT 34.0 WEIGHT PERCENT NICKEL, FROM ABOUT 13.5 TO ABOUT 16.0 WEIGHT PERCENT CHROMIUM, FROM ABOUT 1.9 TO ABOUT 2.3 WEIGHT PERCENT TITANIUM, FROM ABOUT 1.0 TO ABOUT 1.5 WEIGHT PERCENT MOLYBDENUM, FROM ABOUT ABOUT 0.01 WEIGHT PERCENT PHOSPHOROUS, FROM ABOUT 0 TO ABOUT 0.010 WEIGHT PERCENT SULFUR, FROM ABOUT 0.1 TO ABOUT 0.35 WEIGHT PERCENT SULFUR, FROM ABOUT 0.1 TO ABOUT WEIGHT PERCENT VANADIUM, AND THE BALANCE IRON.
Claim 3
Dependent Claim
71 words
A stainless steel of claim 1 comprising about 0.0014 weight percent boron, about 0.16 weight percent silicon, about 0.11 weight percent manganese, about 0.027 weight percent carbon, about 24.7 weight percent nickel, about 14.7 weight percent chromium, about 2.18 weight percent titanium, about 1.25 weight percent molybdenum, about 0.004 weight percent phosphorous, about 0.005 weight percent sulfur, about 0.10 weight percent aluminum, about 0.25 weight percent vanadium, and the balance iron.
Claim 4
Dependent Claim
41 words
A stainless steel of claim 1, electron beam weldable in the solution treated condition without cracking at electron beam gun parameters of 75 inches per minute welding rate, 150 kilovolts, 17 milliamps, sharp focus, and 8 inch gun to workpiece distance.
Claim 5
Dependent Claim
27 words
A stainless steel of claim 1 wherein the maximum alloy weight percent for phosphorous is about 0.005 weight percent and for sulfur is about 0.005 weight percent.
Claim 6
Dependent Claim
25 words
A stainless steel of claim 1, wherein said hydrogen environment comprises a hydrogen atmosphere at about 3,500 pounds per square inch and at 200*C temperature.
Claim 7
Dependent Claim
17 words
A stainless steel of claim 1 with ductility properties not severely adversely affected when supersaturated with hydrogen.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |