... The roller with heat treatment is polished, plated with chrome, the hardness of its surface reaches above SH75. Characteristics:1.The diameter ... of corrugated roller is Φ260mm, Φ310mm, Φ320mm,Φ360mm, Φ430mm. It is ... made from alloy steel 48CrMo. The roller with heat treatment is polished, plated with chrome, the hardness ...