High Manganese Impact Bar 1.ISO Certification 2.Best surface Treatment 3.Heat Treatment:Water ... . Vacuum hardening water glass 5. V Method molding process Material:1. High Manganese Casting: Mn13, Mn18, Mn22, Mn13Cr2, Mn18Cr2, Mn22Cr2, Mn13CrMo, ... Mn13CrMoNi...2. High Chrome Steel:Cr13, Cr15, Cr18, Cr20, Cr25, Cr27, Cr15Mo1, Cr18Mo1 ...