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The accommodation of cast spare parts dimension and weight is very wide, metallic sort accepts restriction scarcely; The spare parts is in have general and mechanical property while, still have wear-resisting, anti-corrosive, suck the integral performance such as shake, be like,be method of other metal figuration forge, make friends, solder, strong impracticable waiting for place. Because this uses the semifinished product part that casts methodological production in the machine building, go up in amount and tonnage heretofore still is most.