Steel for cold forging/nitriding, steel material for cold forging/nitriding, and cold-forged/nitrided component
US9994944B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2011 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Mar 30, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12972
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel for cold forging/nitriding has, by mass percent, C: 0.01 to 0.15%, Si≤0.35%, Mn: 0.10 to 0.90%, P≤0.030%, S≤0.030%, Cr: 0.50 to 2.0%, V: 0.10 to 0.50%, Al: 0.01 to 0.10%, N≤0.0080%, and O≤0.0030%, further according to need a specific amount of one or more elements selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, with the balance being Fe and impurities, and further satisfying the conditions of [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V≤160], [20≤(669.3×logeC−1959.6×logeN−6983.3)×(0.067×Mo+0.147×V)≤80], [140×Cr+125×Al+235×V≥160] and [90≤511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≤170] are excellent in cold forgeability and machinability after cold forging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.