US5069870A
Expired / Lapsed
US
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High-strength high-cr steel with excellent toughness and oxidation resistance
Assignee: Mitsubishi Heavy Industries Ltd
•
Filing: 1990-03-06
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Granted: 1991-12-03
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Expires: 2010-03-06
Abstract
Abstract A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion is disclosed, which consists essentially of, in weight %: C : 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V : 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1%, B : 0-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0-0.2%, and Fe and incidental impurities: balance.
Inventors
- 👤 Atsuro Iseda
- 👤 Yoshiatsu Sawaragi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:09
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/20; C22C38/22
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
88 words
A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.004-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr:8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta are each in an amount of 0-0.2%, and Fe and incidental impurities: balance.
Claim 2
Dependent Claim
88 words
A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.004-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr:8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta are each in an amount of 0-0.2%, and Fe and incidental impurities: balance.
Claim 3
Dependent Claim
17 words
A high-strength high-Cr steel as set forth in claim 1 wherein the content of B is 0.0001-0.2%.
Claim 4
Dependent Claim
29 words
A high-strength high-Cr steel as set forth in claim 1 containing at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0.01-0.2%.
Claim 5
Dependent Claim
33 words
A high-strength high-Cr steel as set forth in claim 1 containing 0.0001-0.02% of B and at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0.01-0.2%.
Claim 6
Dependent Claim
21 words
, A high-strength high-Cr steel as set forth in claim 1 wherein: Si: 0.01-0.7%, Ni: 0.05-1%, Al: 0.005-0.05%, and N: 0.02-0.1%.
Claim 7
Dependent Claim
30 words
A high-strength high-Cr steel as set forth in claim 1 wherein Si: 0.01-0.04%, Mn: 0.1-1.1%, Ni: 0.05-1%, Mo: 0.1-1.2%, W: 0.08-3%, Al: 0.005-0.05%, Cu: 1-3%, Mg: 0.005-0.02%, and N: 0.02-0.08%.
Claim 8
Dependent Claim
38 words
A high-strength high-Cr steel as set forth in claim 1 wherein C: 0.06-0.15%, Si: 0.01-0.2%, Mn: 0.3-0.7%, Ni: 0.3-1%, Cr: 9-13%, Mo: 0.1-0.7%, W: 1.5-3%, V: 0.2-0.3%, Nb: 0.03-0.1%, Al: 0.005-0.03%, Cu: 1.5-2.5%, Mg: 0.001-0.01%, and N: 0.04-0.08%.
Claim 9
Dependent Claim
19 words
A high-strength high-Cr steel as set forth in claim 1 wherein the content of δ-ferrite is 5-30% by volume.
Claim 10
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 1 wherein the content of P is no greater than 0.025%.
Claim 11
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 1 wherein the content of P is no greater than 0.015%.
Claim 12
Dependent Claim
88 words
A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0.001-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0-0.02%, and Fe and incidental impurities: balance.
Claim 13
Dependent Claim
88 words
A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0.001-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0-0.02%, and Fe and incidental impurities: balance.
Claim 14
Dependent Claim
29 words
A high-strength high-Cr steel as set forth in claim 11 containing at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0.01-0.2%.
Claim 15
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 11 wherein Si: 0.01-0.7%, Ni: 0.05-1%, Al: 0.005-0.05%, and N: 0.02-0.1%.
Claim 16
Dependent Claim
30 words
A high-strength high-Cr steel as set forth in claim 11 wherein Si: 0.01-0.4%, Mn: 0.1-1.1%, Ni: 0.05-1%, Mo: 0.1-1.2%. W: 0.8-3%, Al: 0.005-0.05%, Cu: 1.0-3%, Mg: 0.0005-0.02%, and N: 0.02-0.08%.
Claim 17
Dependent Claim
38 words
A high-strength high-Cr steel as set forth in claim 11 wherein C: 0.06-0.15%, Si: 0.01-0.2%, Mn: 0.3-0.7%, Ni: 0.3-1%, Cr: 9-13%, Mo: 0.1-0.7%, W: 1.5-3%, V: 0.2-0.3%, Nb: 0.03-0.1%, Al: 0.005-0.03%, Cu: 1.5-2.5%, Mg: 0.001-0.01%, and N: 0.04-0.08%.
Claim 18
Dependent Claim
19 words
A high-strength high-Cr steel as set forth in claim 11 wherein the content of δ-ferrite is 5-30% by volume.
Claim 19
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 11 wherein the content of P is no greater than 0.025%.
Claim 20
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 11 wherein the content of P is no greater than 0.015%.
Claim 21
Dependent Claim
88 words
A high-strength high-Cr steel with high-temperature strength and excellent toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0.001-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0.01-0.2%, and Fe and incidental impurities: balance.
Claim 22
Dependent Claim
88 words
A high-strength high-Cr steel with high-temperature strength and excellent toughness as well as improved resistance to oxidation and high-temperature corrosion, which consists essentially of, in weight %: C: 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1% B: 0.001-0.02%, at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0.01-0.2%, and Fe and incidental impurities: balance.
Claim 23
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 19 wherein Si: 0.01-0.7%, Ni: 0.05-1%, Al: 0.005-0.05%, and N: 0.02-0.1%.
Claim 24
Dependent Claim
30 words
A high-strength high-Cr steel as set forth in claim 19 wherein Si: 0.01-0.4%, Mn: 0.1-1.1%, Ni: 0.05-1%, Mo: 0.1-1.2%, W: 0.8-3%, Al: 0.005-0.05%, Cu: 1-3%, Mg: 0.0005-0.02%, and N: 0.02-0.08%.
Claim 25
Dependent Claim
38 words
A high-strength high-Cr steel as set forth in claim 19 wherein C: 0.06-0.15%, Si: 0.01-0.2%, Mn: 0.3-0.7%, Ni: 0.3-1%, Cr: 9-13%, Mo: 0.1-0.7%, W: 1.5-3%, V: 0.2-0.3%, Nb: 0.03-0.1%, Al: 0.005-0.03%, Cu: 1.5-2.5%, Mg: 0.001-0.01%, and N: 0.04-0.08%.
Claim 26
Dependent Claim
19 words
A high-strength high-Cr steel as set forth in claim 19 wherein the content of δ-ferrite is 5-30% by volume.
Claim 27
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 19 wherein the content of P is no greater than 0.025%.
Claim 28
Dependent Claim
20 words
A high-strength high-Cr steel as set forth in claim 19 wherein the content of P is no greater than 0.015%.
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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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |