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Diameter range of screw machining | Ø20-Ø300 |
Length diameter ratio | L/D=15~55 |
Tempering hardness | HB240°~280° |
Nitriding hardness | HV850°~1000° |
Nitriding depth | 0.45~0.7mm |
Nitriding brittleness | ≤ secondary |
Surface roughness | Ra0.4 |
Screw straightness | 0.015mm |
Hard chromium plating on the surface after nitriding | HV≥900HV |
Thickness of chromium plating layer | 0.05~0.10mm |
Alloy depth | 0.8~2.0mm |
Hardness of double alloy | HRC56°~65° |
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