... .(4),we were certificated to ISO9001:2000 and API (5),main material are 5CrMnMo,40Cr,42CrMo,20Cr2Ni4,5CrNiMo,15CrNiMo,20CrNiMo,35CrMo ... are with tremendous sincerity welcome your arrival and guide!!! (12 ),shaft forging 1,WEIGHT≤15T 2,length ≤18m 3,mim dia ... that our factory can make also share the same requirements shaft