Heat-treated steels, alloy steels and free-cutting steels; Part XV : Valve steels for internal combustion engines
Описание (англ.):
Gives specifications for the grades of wrought alloyed steels listed in table 1 and usually intended for the manufacture of heads of high-stressed outlet valves of internal combustion engines. They may also be used for inlet valves. Does not apply to hardfacing alloys or to valve seat inserts. ISO 683-15 is applicable only to hot-formed bars of a diameter up to and including 40 mm.