... High quality and resonable price 4. Best service Work Roll:Technic request:1,JB/ZQ4000.7-86 receive ... fifth2,work roll heat treatment :surface of neck :50- ... :1.5HSD3,Ultrasonic inspect by YB3209-824,Surface of work roll : no crack ,spot ,scratch,corrosion ,nonmetal ... inpurityand so on. No damage of hardness test5,work rolls are able to adapt to high-speed product ...