This European Standard applies toThe grades of wrought high-alloy materials listed in table 1.These valve materials are used for intake and exhaust valves in reciprocating internal combustion engines. It is applicable to bars, wire, rod and forgings and forThe surface finishes listed in note 3 of 6.3.
EN 10090:1998 history
1998EN 10090:1998 Valve steels and alloys for internal combustion engines