The diameter from 240mm to 900mm The length is less than 6000mm weight is less than 8T The material is 60CrMoV,H13,80Cr2MoV,Gr15,9Cr2Mo, 9Cr2. barrel hardness less than 100HSD making process steel ingot-forging-rough machining-QT-2th rough machining -induction quenching-finished machining-oiling-packing-delivery