... ,17Cr2Ni2Mo,etc multi-diameter shaftforged,forgingshaft:plain shaft,multi-diameter shaft,gear shaft,eccentric shaft,wind power main shaft,impellerSize:diameter=1500mm max,L=14000mm ... +lf+vd+forge vd=vacuum degassing2 het trestment:annealing/normalizing/soft cooling3 finish and apperance:rough turning(peeled)/gringding/black condition ...