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| Technical Index | Material&Processes | ||
| Hardness After Hardending&Tempering | HB240~280 | Quality 38CrMoALA | |
| Nitrided Hardness | HV950~1000 | ||
| Nitrided Case Depth | 0.55~0.7mm | Quality Powder Metallurgy Raw Materials | |
| Nitrided Brittleness | Less Than Grade 1 | ||
| Surface Roughness | Ra 0.4 | ||
| Screw Straightness | 0.015mm | Cold/Thermal Spray Hard Metal Process | |
| Surface Chromium-Plating’s Hardness After Nitriding≥900HB | Advanced nitriding Process | ||
| Chromium –plating Depth | 0.05~0.10mm | Corrosion & Abrasion Resistance Bimetal Spraying Process | |
| Alloy Hardness | HRC55~62 | ||
| Alloy Depth | 1.5~2.0mm | ||
rubber extruder screw