Composite alloy steel powder and sintered alloy steel
US4954171A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Jul 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12181
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided herein are high-strength high-toughness sintered alloy steel and composite alloy steel powder useful for the production thereof. The sintered alloy steel contains, as the alloy components in the final product, Ni, Mo, and/or W, and C, if necessary, said alloy being composed of 0.50-3.50 wt % of Ni, 0.65-3.50 wt % of Mo+1/2W, (and 0.3-0.8 wt % of C, if necessary), and the remainder of Fe and inevitable impurities, and has a density higher than 7.0 g/cm.sup.3 and a tensile strength higher than 130 kgf/mm.sup.2 after quenching and tempering. The composite alloy steel powder is composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, with the content of Ni and the content of Mo+1/2W in the steel powder of particle diameter smaller than 45 .infin.m being in the range of 2.0-4.2 times the average content in the entire steel powder. The sintered alloy steel has high strength and high toughness despites its comparatively low alloy composition and can be produced without any special equipment. The heat-treated sintered steel meets the requirements for automotive parts and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.