... Alloy mould: Diamond sand wheel. Hard alloy Alloy moulds:Grade : J101,J901,F23,YWN15,YGX15,YGX1,YG8T,YG15C,YG20C1:Characteristics of Alloy moulds:A: Hard alloy ... ;D: Special hard alloy moulds with the high precision and long service life for extrusion of aluminum and copper.E: ... tenacity resistant to high speed repetitive impact.YWN15: The alloy is for moulds forming magetic products such as NdFeB magn ...