Patent US3754899A successfully refreshed from Google Patents.
US3754899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Austenitic alloy containing boron and processes for manufacturing thesame
Assignee: Individual
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Filing: 1970-12-14
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Granted: 1973-08-28
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Expires: 1990-12-14
Abstract
Abstract An austenitic ferrous base alloy characterized by improved stability at high temperatures, and by improved resistance to sensitization and to corrosion, cracking, and general deterioration. The austenite is an iron-chromium-nickel alloy containing from 0.01 to 0.2 percent boron, less than 0.009 percent carbon, and substantially free from nitrogen and oxygen. The boron is a solute in the austenite. The process of manufacture is to form a melt of iron, chromium, nickel and other additives, and then add a ferro-boron alloy having a melting point well below that of the base alloy. The process is carried out in a vacuum furnace in order to substantially eliminate carbon, nitrogen, and oxygen from the alloy.
Inventors
- 👤 J Kanter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:33
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A ferrous base alloy characterized by high temperature stability and by being substantially completely austenitic, consisting essentially of from about 12 percent to about 30 percent by weight cHromium, from about 8 percent to about 20 percent by weight nickel, from about 0.01 percent to about 0.2 percent boron, 0 percent to about 2.5 percent by weight manganese, 0 percent to about 1.5 percent by weight silicon, less than 0.009 percent by weight carbon, and in which the total amount of carbon and nitrogen is less than 0.01 percent by weight, and the balance iron with incidental impurities that do not interfere with the solubility of boron, said boron in the form of a solid solute in the austenite, said alloy substantially free from carbon, nitrogen, and oxygen in total amounts that will react with the boron and adversely affect the alloy, and said alloy substantially free from the precipitated forms of boron.
Claim 2
Dependent Claim
129 words
An austenitic iron-base alloy having a composition within the range between from about 12 percent to about 30 percent chromium, from about 8 percent to about 20 percent nickel, from about 0.03 percent to about 0.15 percent boron, from 0 percent to about 2.5 percent manganese, from 0 percent to about 1.5 percent silicon, less than 0.009 percent by weight carbon, and in which the total amount of carbon and nitrogen is less than 0.01 percent by weight, said boron in the form of a solid solute in the austenite, and the balance iron with incidental impurities that do not interfere with the solubility of boron, said alloy substantially free from carbon, nitrogen, and oxygen, in total amounts that will react with the boron and adversely affect the alloy.
Claim 3
Dependent Claim
71 words
An austenitic ferrous base alloy characterized by high temperature stability having essentially the following composition: Boron 0.03-0.15% Chromium 17-19% Nickel 8-10% Manganese 2% max Silicon 1% max Phosphorus 0.045% max Carbon 0.009% max Iron remainder said boron in the form of a solid solute in the austenite, and said alloy substantially free from carbon, nitrogen and oxygen in total amounts that will react with the boron and adversely affect the alloy.
Claim 4
Dependent Claim
68 words
An austenitic ferrous base alloy characterized by high temperature stability having essentially the following composition: Boron 0.02-0.08% Chromium 18-20% Nickel 8-12% Manganese 2% max Silicon 1% max Carbon 0.009% max Iron remainder said boron in the form of a solid solute in the austenite, and said alloy substantially free from carbon, nitrogen and oxygen, in total amounts that will react with the boron and adversely affect the alloy.
Claim 5
Dependent Claim
68 words
An austenitic ferrous base alloy characterized by high temperature stability having essentially the following composition: Boron 0.012% Chromium 17-19% Nickel 10-13% Manganese 2% max Silicon 1% max Carbon 0.009% max Iron remainder said boron in the form of a solid solute in the austenite, and said alloy substantially free from carbon, nitrogen and oxygen in total amounts that will react with the boron and adversely affect the alloy.
Claim 6
Dependent Claim
68 words
An austenitic ferrous base alloy characterized by high temperature stability having essentially the following composition: Boron 0.01-0.08% Chromium 22-24% Nickel 19-22% Manganese 2% max Silicon 1% max Carbon 0.009% max Iron remainder said boron in the form of a solid solute in the austenite, and said alloy substantially free from carbon, nitrogen and oxygen, in total amounts that will react with the boron and adversely affect the alloy.
Claim 7
Dependent Claim
68 words
An austenitic ferrous base alloy characterized by high temperature stability having essentially the following composition: Boron 0.01-0.08% Chromium 24-26% Nickel 19-22% Manganese 2% max Silicon 1.5% max Carbon 0.009% max Iron remainder said boron in the form of a solid solute in the austenite, and said alloy substantially free from carbon, nitrogen and oxygen in total amounts that will react with the boron and adversely affect the alloy.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |