... -50mm, Roundness: 0.005mm. 3.Material, steel, ss steel etc Shaft 1. material:carbon steel:C35,C45,40Cr etcalloy steel:42CrMo ... /mm2,Elongation (L=5D) = 16% Min. Applied range:Forging shaft/forged shaft used in wind power generation high-speed gear case,high ... extraction,mining,chemical industry, hydraulic pressure products, port and shipping driving machines etc.