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Screws of injection molding machines are mainly divided into the following types according to their materials:
1. HPT full-hardened powder alloy injection molding machine screw: adopts tungsten-cobalt powder alloy tool steel and is formed by a special process of overall hardening treatment. The internal and external hardness of the screw is the same, reaching about HRC65°. It is suitable for processing various transparent products, accurate products, and special high temperature and high corrosive plastics such as LCP, PPS, PES, PPA and other fiber-added products.
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