Material and Heat treatmentMaterialHeat Treatment1) 38CrMoALA(JIS SACM645)Nitriding treatment2 ) 9Cr18MoVCorrosion & Abrasion resistance bimetallic alloy coating  China Twin conical screw barrel for recycled plastic extrusion machine     
  Technical ParameterHardness after hardening and temperingHB260 º -290 ºDepth of nitriding0.55-0.85mmHardness of nitridingHV 950-1020Fragility of nitridingLess than grade 2Depth of bimetallic layer2.0-3.0mm Hardness of bimetallicHRC59 º -65 ºRoughness of the surfaceRa 0.4um conical twin screw and barrel  sizeØ45/Ø90Ø45/100Ø50/Ø105Ø51/Ø105Ø 55/ Ø 110Ø60/Ø125Ø65/Ø120Ø65/132Ø68/Ø132Ø 70/ Ø 140Ø75/Ø150Ø80/Ø143Ø80/Ø156Ø92/Ø188