... 3.Impact value>akv/18J. 4.Hardness: 48-52HRC 5.Quality assured!!! 1.Materials: carbon steel, alloy steel, cast iron, ... cast steel, pig iron, grey iron, ductile cast iron and so on2.material standard:GB,DIN,EN,NF,ISO,JIS ... Heat Treatment, Shot Blasting, Reshaping, Machining2) Has established efficient quality system and obtained international approvals ISO9001, TUV-PED, BV3) Produced by experienced ...