... .The corrugated roll is made of 52CrMo precision forging alloy steel, with the treatment of hardening and tempering, grinding, laser-quenching ... and replacement.The pressure roll is made of medium carbon steel, with the treatment of hardening and tempering, grinding and ... screw and eccentric sleeve.The pre-heater is made of seamless steel tube, and connected by flexible metal hose.The machine is ...