Phosphorus steel powder and a method of manufacturing the same
US4090868A · kind A · utility
11Cited by
3References
17Claims
0Family size
Inventors
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C33/0207
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A phosphorus steel powder for manufacturing sintered details having an extremely small tendency to brittleness ruptures consists of iron or steel powder substantially free from phosphorus, mixed with a phosphorus powder containing in all less than 4% impurities which are at the sintering temperature more easily oxidized than the main components iron and phosphorus. The iron-ferrophosphorus mixture is heated with or without the addition of oil in reducing atmosphere to a temperature of between 65.degree. and 900.degree. C for a period of 15 minutes to 2 hours to improve the protection against segregation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.