Method of heat treatment for two welded-together parts of different steel alloy grades
US5407497A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1994 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Feb 1, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2251/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of heat treatment for two welded-together parts of different steel alloy grades, the first part, called A, having critical heating transformation temperatures AC.sub.1 A and AC.sub.3 A and an optimum post-welding treatment temperature .theta..sub.A which is lower than AC.sub.1 A, the second part, called B, having critical heating transformation temperatures AC.sub.1 B and AC.sub.3 B, which are respectively lower than AC.sub.1 A and AC.sub.3 A and an optimum post-welding treatment temperature .theta..sub.B which is lower than AC.sub.1 B and .theta..sub.A, wherein a first heat treatment cycle is carried out at said temperature .theta..sub.A followed by a second heat treatment cycle at a temperature .theta..sub.B. Between the two cycles, the temperature is reduced to below 100.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.