US3847600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature alloy steel
Assignee: JFE Engineering Corp
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Filing: 1973-05-09
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Granted: 1974-11-12
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Expires: 1993-05-09
Abstract
Abstract An alloy steel suitable for use at high temperatures, having excellent corrosion resistance, creep strength, hot forming characteristics and weldability. The steel is an inexpensive ferrite steel having a composition comprising C up to 0.10 percent, Si up to 1%, MN 0.3 - 1.20 percent, Cr 7-10 percent, Mo 0.3-1.5 percent V 0.1 - 0.3 percent, Nb 0.15 - 0.50 percent, B up to 0.012 percent, N up to 0.050 percent balance fe and incidental impurities.
Inventors
- 👤 T Mimino
- 👤 K Kinoshita
- 👤 K Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:19
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; C22C38/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A HIGH TEMPERATURE ALLOY STEEL HAVING HIGH CREEP RUPTURE STRENGTH UP TO TEMPERATURES OF ABOUT 650* CONSISTING ESSENTIALLY OF THE FOLLOWING ELEMENTS IN THE FOLLOWING WEIGHT PERCENTAGES:
Claim 2
Dependent Claim
27 words
A HIGH TEMPERATURE ALLOY STEEL HAVING HIGH CREEP RUPTURE STRENGTH UP TO TEMPERATURES OF ABOUT 650* CONSISTING ESSENTIALLY OF THE FOLLOWING ELEMENTS IN THE FOLLOWING WEIGHT PERCENTAGES:
Claim 3
Dependent Claim
16 words
A high temperature alloy steel according to claim 1, containing 0.001 to 0.012 percent of boron.
Claim 4
Dependent Claim
16 words
A high temperature alloy steel according to claim 1, containing 0.015 to 0.050 percent of nitrogen.
Claim 5
Dependent Claim
22 words
A high temperature alloy steel according to claim 1, containing 0.001 to 0.012 percent of boron and 0.015 to 0.050% of nitrogen.
Claim 6
Dependent Claim
16 words
A HIGH TEMPERATURE ALLOY STEEL CONSISTING ESSENTIALLY OF THE FOLLOWING ELEMENTS IN THE FOLLOWING WEIGHT PERCENTAGES.
Claim 7
Dependent Claim
16 words
A HIGH TEMPERATURE ALLOY STEEL CONSISTING ESSENTIALLY OF THE FOLLOWING ELEMENTS IN THE FOLLOWING WEIGHT PERCENTAGES.
Claim 8
Dependent Claim
26 words
A high temperature alloy steel tube having high creep rupture strength up to temperatures of about 650* consisting essentially of the alloy steel of claim 5.
References Cited (Backward Citations)
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |