
Steels For Exhaust Valves Of Internal Combustion Engines; Quality Specifications
出版:European Committee for Iron & Steel Standardization

专家解读视频
71 [01/09/1971]
BS 970-4:1970 - Similar
DIN 17480 (1992-05) - Similar
DIN 17480 E : 1992 - Similar to
NBN A 21 224 : 1982 - Identical
BS 970-4(1970) : 1970 - Similar to
NEN EU 90 : 1986 - Identical