... parts, machining parts, surface treatment parts, etc.Copper and Copper Alloys Casting ProblemsPure copper is extremely difficult to cast as well as ... temperature at which the metal is completely frozen.Group I alloysGroup II alloys……Group III alloysGroup III alloys have a wide ... freezing range of well over 110oC, even up to 170oC. Group III alloys are: leaded red brass (C83450, C83600, C83800), ...