Low-alloy heat-resistant steel, heat treatment method therefor, and turbine rotor comprising the same
US6755920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Jun 25, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A low-alloy heat-resistant steel may be used to manufacturing a large element which has uniform superior high temperature properties through a surface layer to a center part. The low-alloy heat-resistant steel comprises carbon in an amount of 0.20 to 0.35% by weight, silicon in an amount of 0.005 to 0.35% by weight, manganese in an amount of 0.05 to 1.0% by weight, nickel in an amount of 0.05 to 0.3% by weight, chromium in an amount of 0.8 to 2.5% by weight, molybdenum in an amount of 0.1 to 1.5% by weight, tungsten in an amount of 0.1 to 2.5% by weight, vanadium in an amount of 0.05 to 0.3% by weight, phosphorus in an amount not greater than 0.012% by weight, sulfur in an amount not greater than 0.005% by weight, copper in an amount not greater than 0.10% by weight, aluminum in an amount not greater than 0.01% by weight, arsenic in an amount not greater than 0.01% by weight, tin in an amount not greater than 0.01% by weight, antimony in an amount not greater than 0.003% by weight, and the balance being iron and unavoidable impurities, and containing a metallic structure having an austenitic grain size number in a range of from 3 to 6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.