Process for heat treatment of a metal workpiece
US4410373A · kind A · utility
Inventor
Key dates
| Filing date | Sep 30, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Sep 30, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D5/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for heat treatment of a metal workpiece, such as a casting (steel, aluminum based alloy or white cast iron). The casting is heated in a fluidized particulate bed (sand) to a relatively constant first temperature. Then, the casting is held (e.g., 3 hours) tightly packed against shape changes in the unfluidized bed until internal structural changes have occurred. Next, the casting is cooled in a fluidized particulate bed (sand) to a relatively constant second temperature. Then, the casting is held (e.g., 3 hours) tightly packed in the unfluidized bed until the desired internal structural changes are completed. The casting is removed from the bed for utilization as a heat treated product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.