| 摘要 |
There is provided an internal combustion engine valve having a body, a head, and a contact surface disposed on said head adapted to periodically enter into gas-sealing engagement with a valve seat, said contact surface being formed in metal deposit welded to said valve head, the composition of said metal deposit being A1 and B free, and measured at said contact surface, consisting essentially of carbon : 1.3 to 2.0 weight percent; chromium: 19 to 23 weight percent ; molybdenum: 8 to 11 weight percent ; nickel: 17 to 21 weight percent ; manganese: 6 to 13 weight percent ; silicon: less than 0.5 weight percent ; oxygen: less than 0.06 weight percent ; balancing iron and inevitable impurities. |
