High-strength, titanium-bearing, powder metallurgy stainless steel article with enhanced machinability
US6238455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Oct 22, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2999/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A powder metallurgy article formed of a sulfur-containing, precipitation-hardenable, stainless steel alloy is described. The article has a unique combination of strength, ductility, processability, and machinability. The powder metallurgy article is formed of a stainless steel alloy having the following composition in weight percent. C 0.03 max. Mn 1.0 max. Si 0.75 max. P 0.040 max. S 0.010-0.050 Cr 10-14 Ni 6-12 Ti 0.4-2.5 Mo 6 max. B 0.010 max. Cu 4 max. Co 9 max. Nb 1 max. Al 1 max. Ta 2.5 max. N 0.03 max. The balance of the alloy is iron and the usual impurities. The powder metallurgy article according to this invention is characterized by a fine dispersions of titanium sulfides that are not greater than about 5 .mu.m in major dimension. A method of preparing the powder metallurgy article is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.