US4272289A
Expired / Lapsed
US
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Oxidation resistant iron base alloy articles for welding
Assignee: Haynes International Inc
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Filing: 1979-11-29
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Granted: 1981-06-09
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Expires: 1999-11-29
Abstract
Abstract An improved oxidation resistant iron base alloy article for welding to another article to form a composite product with reduced heat affected zone cracking is provided consisting essentially of about 0.05 to 0.7% carbon, less than 0.3% columbium, about 15 to 30% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 1 to 6% molybdenum, about 0.10 to 0.30% nitrogen, about 15 to 30% nickel, about 0.2 to 0.6% silicon, about 0.1 to 2% tantalum, about 1 to 10% tungsten, about 0 to 0.1% zirconium, about 0 to 0.5% aluminum, about 0 to 0.1% lanthanum and the balance iron >23 w/o with incidental impurities not exceeding 0.6% in aggregate. The combined % of columbium and tantalum being at least 0.4% and the combined carbon and nitrogen being >0.2%.
Inventors
- 👤 Robert B. H. Herchenroeder
- 👤 H. Joseph Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:51
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/52
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
129 words
An improved oxidation resistant iron base alloy article for subsequent welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.05 to 0.7% carbon, less than 0.3% columbium, about 15 to 30% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 1 to 6% molybdenum, about 0.10 to 0.30% nitrogen, about 15 to 30% nickel, about 0.2 to 0.8% silicon, about 0.1 to 2% tantalum, about 1 to 10% tungsten, about 0 to 0.1% zirconium, about 0.1 to 0.5% aluminum, about 0.001 to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 2
Dependent Claim
129 words
An improved oxidation resistant iron base alloy article for subsequent welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.05 to 0.7% carbon, less than 0.3% columbium, about 15 to 30% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 1 to 6% molybdenum, about 0.10 to 0.30% nitrogen, about 15 to 30% nickel, about 0.2 to 0.8% silicon, about 0.1 to 2% tantalum, about 1 to 10% tungsten, about 0 to 0.1% zirconium, about 0.1 to 0.5% aluminum, about 0.001 to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 3
Dependent Claim
17 words
The alloy article of claim 1 wherein the zirconium content is in the range 0.001 to 0.1%.
Claim 4
Dependent Claim
17 words
The alloy article of claim 1 wherein the manganese content is in the range 0.5 to 2%.
Claim 5
Dependent Claim
17 words
The alloy article of claim 1 wherein the aluminum content is in the range 0.1 to 0.5%.
Claim 6
Dependent Claim
24 words
The alloy article of claim 1 having 0.001 to 0.3% zirconium, 0.5 to 2% manganese, 0.001 to 0.1% lanthanum, and 0.1 to 0.5% aluminum.
Claim 7
Dependent Claim
129 words
An improved oxidation resistant iron base alloy article for welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.20% columbium, about 15 to 25% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 2 to 5% molybdenum, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.3 to 2% tantalum, about 1 to 8% tungsten, about 0 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% w/o iron with incidental impurities aggregating less than about 0.6%.
Claim 8
Dependent Claim
129 words
An improved oxidation resistant iron base alloy article for welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.20% columbium, about 15 to 25% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 2 to 5% molybdenum, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.3 to 2% tantalum, about 1 to 8% tungsten, about 0 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% w/o iron with incidental impurities aggregating less than about 0.6%.
Claim 9
Dependent Claim
23 words
The alloy article of claim 6 having about 0.1 to 0.5% aluminum, about 0.5 to 2% manganese, and about 0.001 to 0.1% zirconium.
Claim 10
Dependent Claim
15 words
The alloy article of claim 6 wherein the aggregate % of carbon plus nitrogen >0.2.
Claim 11
Dependent Claim
15 words
The alloy article of claim 7 wherein the aggregate % of carbon plus nitrogen >0.25.
Claim 12
Dependent Claim
139 words
An improved oxidation resistant iron base alloy article for welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.2% columbium, about 15 to 25% cobalt, about 19 to 25% chromium, about 0.5 to 2.0% manganese, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 2 to 5% molybdenum, about 0.2 to 0.15% silicon, about 0.4 to 2% tantalum, about 1 to 8% tungsten, about 0.001 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6% and wherein the aggregate % of carbon plus nitrogen is >0.2.
Claim 13
Dependent Claim
139 words
An improved oxidation resistant iron base alloy article for welding to another article to form a composite product characterized by reduced heat affected zone cracking high oxidation resistance and improved thermal fatigue resistance as compared with columbium and vanadium bearing iron base alloys consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.2% columbium, about 15 to 25% cobalt, about 19 to 25% chromium, about 0.5 to 2.0% manganese, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 2 to 5% molybdenum, about 0.2 to 0.15% silicon, about 0.4 to 2% tantalum, about 1 to 8% tungsten, about 0.001 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6% and wherein the aggregate % of carbon plus nitrogen is >0.2.
Claim 14
Dependent Claim
15 words
The alloy article of claim 10 having about 1 to 4% tungsten and columbium >0.1%.
Claim 15
Dependent Claim
17 words
The alloy article of claim 10 wherein the aggregate columbium and tantalum content is at least 0.4%.
Claim 16
Dependent Claim
17 words
The alloy article of claim 11 wherein the aggregate columbium and tantalum content is at least 0.4%.
Claim 17
Dependent Claim
16 words
The alloy article of claim 10 wherein the aggregate % of carbon plus nitrogen is >0.25.
Claim 18
Dependent Claim
92 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.05 to 0.7% carbon, less than 0.3% columbium, about 15 to 30% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 1 to 6% molybdenum, about 0.10 to 0.30% nitrogen, about 15 to 30% nickel, about 0.2 to 0.8% silicon, about 0.1 to 2% tantalum, about 1 to 10% tungsten, about 0 to 0.1% zirconium about 0.1 to 0.5% aluminum, about 0.001% to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 19
Dependent Claim
92 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.05 to 0.7% carbon, less than 0.3% columbium, about 15 to 30% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 1 to 6% molybdenum, about 0.10 to 0.30% nitrogen, about 15 to 30% nickel, about 0.2 to 0.8% silicon, about 0.1 to 2% tantalum, about 1 to 10% tungsten, about 0 to 0.1% zirconium about 0.1 to 0.5% aluminum, about 0.001% to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 20
Dependent Claim
16 words
The alloy of claim 15 wherein the zirconium content is in the range 0.001 to 0.1%.
Claim 21
Dependent Claim
16 words
The alloy of claim 15 wherein the manganese content is in the range 0.5 to 2%.
Claim 22
Dependent Claim
23 words
The alloy of claim 15 having 0.001 to 0.1% zirconium, 0.5 to 2% manganese, 0.001 to 0.1% lanthanum and 0.1 to 0.5% aluminum.
Claim 23
Dependent Claim
92 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.20% columbium, about 15 to 25% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 2 to 5% molybdenum, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.3 to 2% tantalum, about 1 to 8% tungsten, about 0 to 0.1% zirconium, about 0.001% to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 24
Dependent Claim
92 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.20% columbium, about 15 to 25% cobalt, about 18 to 25% chromium, about 0 to 2% manganese, about 2 to 5% molybdenum, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.3 to 2% tantalum, about 1 to 8% tungsten, about 0 to 0.1% zirconium, about 0.001% to 0.1% lanthanum and the balance >23% iron with incidental impurities aggregating less than about 0.6%.
Claim 25
Dependent Claim
27 words
The alloy of claim 19 having about 0.1 to 0.5% aluminum, about 0.5 to 2% manganese, about 0.001 to 0.1% zirconium and about 0.001 to 0.1% lanthanum.
Claim 26
Dependent Claim
15 words
The alloy of claim 19 wherein the aggregate % of carbon plus nitrogen is >0.25.
Claim 27
Dependent Claim
98 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.2% columbium, about 15 to 25% cobalt, about 19 to 23% chromium, about 0.5 to 2.0% manganese, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.4 to 2% tantalum, about 1 to 8% tungsten, about 0.001 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% carbon with incidental impurities aggregating less than about 0.6% and wherein the aggregate % of carbon plus nitrogen is >0.25.
Claim 28
Dependent Claim
98 words
An improved oxidation resistant iron base alloy consisting essentially of about 0.1 to 0.5% aluminum, about 0.05 to 0.16% carbon, less than 0.2% columbium, about 15 to 25% cobalt, about 19 to 23% chromium, about 0.5 to 2.0% manganese, about 0.10 to 0.25% nitrogen, about 15 to 25% nickel, about 0.2 to 0.5% silicon, about 0.4 to 2% tantalum, about 1 to 8% tungsten, about 0.001 to 0.1% zirconium, about 0.001 to 0.1% lanthanum and the balance >23% carbon with incidental impurities aggregating less than about 0.6% and wherein the aggregate % of carbon plus nitrogen is >0.25.
Claim 29
Dependent Claim
14 words
The alloy of claim 22 having about 1 to 4% tungsten and columbium >0.1%.
Claim 30
Dependent Claim
16 words
The alloy of claim 22 wherein the aggregate columbium and tantalum content is at least 0.4%.
Claim 31
Dependent Claim
16 words
The alloy of claim 23 wherein the aggregate columbium and tantalum content is at least 0.4%.
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) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |