forged cylinder 1,min OD around 150mm 2,weight of single piece ... #.35#,40#,45#,46#,etc.according to customers' different requirements.6,main material are 5CrMnMo,40Cr,42CrMo,20Cr2Ni4,5CrNiMo,15CrNiMo,20CrNiMo ... and customers' clear requirements we can render excellent heat treatment. cylinder block forged cylinder