US3650845A
Expired / Lapsed
US
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Method of manufacture of steel turbine blades
Assignee: Mitsubishi Heavy Industries Ltd
•
Filing: 1969-03-27
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Granted: 1972-03-21
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Expires: 1989-03-27
Abstract
Abstract High toughness steel suitable for the manufacture of turbine blades is composed of defined quantities of Cr, Ni, Co, Mo, and iron, wherein the molybdenum may be replaced by tungsten. The steel composition also contains minor amounts of carbon, silicon and manganese. The composition of this steel is selected so that the quantity of delta Ferrite and the Ms point have predetermined values. The steel is subjected to heat treatment, cooling and aging.
Inventors
- 👤 Teishiro Oda
- 👤 Makoto Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
The method of manufacturing turbine blades as claimed in claim 1, wherein at least a portion of its Mo content is substituted for W at a substitution rate Mo:W of 1:2.
Claim 2
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.23%Ni:5.96%Co:7.02%Mo:3.13%C:0.03%Si:0.36%Mn:0.35%
Claim 3
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.01%Ni:6.21%Co:6.76%Mo:3.08%C:0.01%Si:0.09%Mn:0.15%
Claim 4
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.00%Ni:6.12%Co:7.13%Mo:2.02%C:0.01%Si:0.04%Mn:0.14%
Claim 5
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.51%Ni:5.81%Co:4.48%Mo:4.53%C:0.03%Si:0.06%Mn:0.10%
Claim 6
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.30%Ni:5.92%Co:6.79%Mo:3.93%C:0.03%Si:0.07%Mn:0.08%.
Claim 7
Dependent Claim
33 words
The method of manufacturing a turbine blade of high strength steel as claimed in claim 1, wherein said steel contains the following elements in percentage by weight substantially in the following amounts: Cr:12.08%Ni:5.57%Co:6.86%Mo:2.71%C:0.03%Si:0.32%Mn:0.19%.
References Cited (Backward Citations)
US3093519A
Cited
US3132937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |