... layer and nitriding treatment HPM38,SI36,SUS440,9Cr18MoV High frequency quenching GHII3 Airset in high temperature Screw Diameter15/30,25/55,35 ... : WPC PVC.WPC PE,Super high molecular sheet,1/2 high Calciumbuckle,50-400 high Calcium pipe,50-300 high Calcium Profile,soft PVC sheet ...