... 3.oem M2/DIN1.3343/JIS SKH51(SKH9)/GBW6Mo5Cr4V2 high speed steel 1 high seed steel 2 EF/ESR,hot rolled,annealed 3 ... for manufacture of metal-cutting tools, cold-formingtools, cutting and precision cutting tools. 6 TechniqueEF/ESR + forging+hot rolled +annealed 7 ... /polishing surface option, UT test accord with SEP1921-84 class c/c D2/DIN1.2379/Cr12Mo1V1 high speed steel