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| Seen by the extrusion process, the screw is at an elevated temperature, some corrosion, wear strong, high torque at work, so screw must: (1) high temperature, high temperature deformation; (2) wear resistance, long life; (3) corrosion-resistant material is corrosive; (4) high strength, can withstand high torque, high speed; (5) has a good cutting performance; (6) small residual stress after heat treatment, thermal deformation and the like. |
