Alloyed steel powder for powder metallurgy
US4985309A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1988 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12181
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alloyed steel powder for metallurgy is provided with a water-atomized alloyed steel powder wherein an alloy component, an oxide of which is difficult to be reduced with hydrogen in the production of the powder, has been prealloyed in a composition range not exerting a bad influence upon compressibility of the steel powder, and an alloy component or components easier to be reduced with hydrogen than the above alloy component, the said easily reducible alloy component or components being partially diffused and adhered in a powdered form to the particle surfaces of the water-atomized alloyed steel powder. The composite powder of the invention has a coating layer of at least one element selected from nickel, copper, molybdenum and tungsten which is partially diffused and adhered in a powder form to the surface of a chromium containing prealloyed steel powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.