High strength, ferritic heat-resistant steel having improved resistance to intermetallic compound precipitation-induced embrittlement
US5772956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Oct 11, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A martensitic heat resistant steel is provided which has improved high temperature creep strength, contains Co and, at a temperature of 600.degree. C. or above, does not form an intermetallic compound substantially having a composition of Cr.sub.40 Mo.sub.20 Co.sub.20 W.sub.10 C.sub.2 --Fe. In a heat-resistant steel, containing not less than 8% of Cr, with Co, Mo, and W being simultaneously added thereto, a combination of the addition of a very small of Mg, Ba, Ca, Y, Ce, La and the like, with the addition of a minor amount of Ti and Zr, inhibits the precipitation of an intermetallic compound substantially having a composition of Cr.sub.40 Mo.sub.20 Co.sub.20 W.sub.10 C.sub.2 --Fe, thereby ensuring high temperature creep strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.