Lead-free steel for machine structural use with excellent machinability and low strength anisotropy
US7195736B1 · kind B1 · utility
3Cited by
4References
18Claims
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Key dates
| Filing date | Feb 10, 2000 |
| Grant date | Mar 27, 2007 |
| Priority date | — |
| Expiry date | Feb 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A lead-free steel for machine structural use with excellent machinability and low strength anisotropy, which does not contain Pb and is equal to or higher than a conventional Pb-containing free cutting steel in properties, is provided. This steel includes, on the weight basis, C: 0.10 to 0.65%; Si: 0.03 to 1.00%; Mn: 0.30 to 2.50%; S: 0.03 to 0.35%; Cr: 0.1 to 2.0%; Al: less than 0.010%; Ca: 0.0005 to 0.020%; Mg: 0.0003 to 0.020%; O: less than 20 ppm; and the balance being Fe and inevitable impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.