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To itsNicety is castFor the choice of semifinished product, its hardware data still has a few crucial effect, because the craft of hardware data is characteristic,decided the sort of semifinished product roughly with mechanical function. For example cast-iron spare parts is used cast steel of semifinished product; to pledge the spare parts is become appearance is simpler and commonly used club expects when mechanical performance demand is not high, to important steel qualitative part, to acquire good mechanical property, should choose forging, when appearance cast steel is used when demand of complex and mechanical performance is not high spare parts of; nonferrous metal is commonly used profile or cast semifinished product. The choice because of this semifinished product to Nicety is cast For it is very important.