1. ISO9001, BV, TUV-PED certificated 2. OEM is accepted 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,SS,BS,AISI,SAE,ASTM,UNS,ACI3. Technology: lost wax (water glass)Manufacture process:1) Lost Wax Process: Wax Patterns, Sand ...