Forging Step shaft Material:45#, 42CrMo, 30CrMo, 50CrMo4 Production Alibilty: Max OD ... Steel/ Stainless steel and heat resistant steel ( C45, ST 37-2, ST 52-3N, S355J2 +N, S355NL , 4140,42CrMo4, 4145H,4340 ... OD 3500mm Roller: Max OD 3000mm45#, 42CrMo, 30CrMo, 50CrMo4 Forging Step shaft Forging step shaft 45# 42CrMo 30CrMo 50CrMo4