... corrugated roll is made of 52CrMo precision forging alloy steel, with the treatment of hardening and tempering, grinding, laser-quenching, ... tungsten carbide, make the hardness up to HVC1200.Equipped with spay wetness adjusting deivce to avoid paper cracking and keep ... and replacement.The pressure roll is made of medium carbon steel, with the treatment of hardening and tempering, grinding and chrome ...