High-hardness powder metallurgy tool steel and article made therefrom
US6482354B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Jul 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D6/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A tool steel alloy having a unique combination of hardness and toughness is disclosed. The alloy contains, in weight percent, about: wt. % C 1.85-2.30, Mn 0.15-1.0, Si 0.15-1.0, P 0.030 max., S 0-0.30, Cr 3.7-5.0, Ni+Cu 0.75 max., Mo 1.0 max., Co 6-12, W 12.0-13.5, V 4.5-7.5. The balance is essentially iron and usual impurities. The elements C, Cr, Mo, W, and V are balanced in this alloy such that −0.05≦&Dgr;C≦−0.42 where &Dgr;C=((0.033W)+(0.063Mo)+(0.06Cr)+(0.2V))−C. A powder metallurgy tool steel article made from consolidated alloy powder having the aforesaid weight percent composition provides a Rockwell C hardness of at least about 69.5 when heat treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.