Lead-free steel for machine structural use with excellent machinability and low strength anisotropy
US7445680B2 · kind B2 · utility
2Cited by
6References
16Claims
0Family size
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Key dates
| Filing date | Aug 6, 2004 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | Dec 13, 2025 |
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 an isotropy, which does not contain Pb and is equal to or higher than a conventional D 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%; 0: less than 20 ppm; and the balance being Fe and inevitable impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.