Conical twin screw & barrel
Product Description
Product Specification and technical data
- Diameter：Φ35/77～Φ92/188
- Quenching and tempering hardness: HB240-280°
- Nitration hardness: HV900-1,050°
- Depth of Nitrated Layer: 0.5-0.8mm
- Thickness of Cr-coated Layer: 0.03-0.08mm
- Nitration fragility: ≤grade 1
- Surface roughness: Ra 0.4um
- Straightness: 0.015mm
- Cr-coating layer hardness: HV≥950HV
- Depth of Bimetallic Layer: 3-5mm
- Bimetallic hardness: HRC52-64°
Material :quality alloy steels
- ① 41CrAlMo7
- ② EN41-B
- ③ AISI4140
- ④ 1.85
- ⑤ SKD61，SKD11
- ⑥ 38CrMoAlA
- ⑦ W6Mo5Cr4V2
Heat-treatment:
- Nitriding treatment
- Electroplated hard-chrome finish
- Vacuum，High-frequency quenching
- Baking，Spray welding Bimetallic-alloy
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