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Zhoushan Weida Machinery Co., Ltd.
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Payment Terms: | T/T,L/C |
Place of Origin: | Zhejiang, China (Mainland) |
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Degree of Abrasiveness | Low | Moderate | High |
Screws | Nitrided | Bimetallic Spraying | Tungsten Coated |
Barrels | Nitrided | Bimetallic | Bimetallic |
Steel Material | DIN 41CrA1Mo7 / AST M4140/ GB 38CrMoAlA, 9Cr18MoV |
Heat Treatment | Tempered and nitride, nitride depth: 0.5 – 0.7 mm |
Surface hardness: | HV900 – HV1, 000 |
Special treatment: | Carbide coating (screw flight) and bimetallic barrel |
Screw straight tolerance | 0.015 mm/m |
Surface roughness | Ra 0.4μm |