Alloy mould: Diamond sand wheel. Hard alloy Alloy moulds:Grade : J101,J901,F23, ... YGX1,YG8T,YG15C,YG20C1:Characteristics of Alloy moulds:A: Hard alloy with high hardness,resistant to oxidation, high ... moulds;C: Moulds with optical fiber or nylon;D: Special hard alloy moulds with the high precision and long service ... has a serivce life 16 times longer than the hard steel mould.J101:The alloy is used in ...