Method of production of steel superior in machinability
US8137484B2 · kind B2 · utility
1Cited by
5References
4Claims
0Family size
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Key dates
| Filing date | Oct 20, 2008 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Apr 6, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides steel superior in machinability comprised of, by wt %, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.2 to 3.0%, P: 0.001 to 0.2%, S: 0.03 to 1.0%, T.N: 0.002 to 0.02%, T.O: 0.0005 to 0.035%, and the balance of Fe and unavoidable impurities, said steel satisfying one or both of Mn/S in the steel being 1.2 to 2.8 or an area ratio of pearlite over a grain size of 1 μm in a microstructure of the steel being not more than 5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.