High-chromium ferritic, heat-resistant steel having improved resistance to copper checking
US5240516A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 2, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Jun 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A Cu-containing, high-Cr ferritic, heat-resistant steel is prevented from copper checking without a reduction in strength, toughness, resistance to hot corrosion, or oxidation, and its weldability is maintained at satisfactory levels. The steel consists essentially, on a weight basis, of: C: 0.03-0.15%, Si: at most 0.7%, Mn: 0.1-1.5%, Ni: 0.05-1.0%, Cr: 8-14%, W: 0.8-3.5%, V: 0.1-0.3%, Nb: 0.01-0.2%, N: 0.001-0.1%, Al: at most 0.05%, Cu: 0.4-3.5%, B: 0-0.02%, one or more elements selected from the group consisting of La, Ce, Ca, Y, Ti, Zr, and Ta: 0-0.2% each, and a balance of Fe and incidental impurities, wherein the Cu and Ni contents satisfy the following Inequality: 2.5.ltoreq.(%Cu)/(%Ni).ltoreq.4.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.