Heat-resisting steel for exhaust valves
US9745649B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 24, 2012 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Oct 10, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L3/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The object of the present invention is to provide a heat-resistant steel for exhaust valves, having relatively small Ni content, high mechanical characteristics (for example, tensile strength, fatigue strength, wear resistance and hardness) at high temperature, and excellent oxidation resistance. The present invention provides a heat-resistant steel for exhaust valves, which includes: 0.45≦C<0.60 mass %, 0.30<N<0.50 mass %, 19.0≦Cr<23.0 mass %, 5.0≦Ni<9.0 mass %, 8.5≦Mn<10.0 mass %, 2.5≦Mo<4.0 mass %, 0.01≦Si<0.50 mass %, and 0.01≦Nb<0.30 mass %, with the balance being Fe and unavoidable impurities, in which the steel satisfies 0.02≦Nb/C<0.70 and satisfies 4.5≦Mo/C<8.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.