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Conical Twin Screw Barrel for PVC Granule Sheet Profile Pipe Extrusion Screw Barrel. Customizable Screw Design: Compression ratio and specifications tailored to specific products and ingredients. Premium Base Materials: Constructed from 38CrMoAlA, 42CrMo, SKD-61, and other high-grade steels. Advanced Alloy Options: Available with Ni-based, Co-based, Fe-based alloys, and tungsten carbide. High Hardness & Wear Resistance: Nitrided hardness up to 1000HV; bimetallic layer hardness HRC58-62. Precise Surface Finish: Surface roughness Ra 0.4 with linearity of screw at 0.015mm. 1-Year Warranty: Comprehensive 12-month warranty coverage for peace of mind. OEM/ODM Support: Full OEM and ODM services available for customized screw barrels.