Power shafts for large ships

Product Description Power shafts for large ships are integral forged bars that connect the main engine to the propeller or electric motor. Starting from vacuum-degassed carbon or low-alloy steel (C45, 34CrNiMo6, 42CrMo4), we upset forge, roll and machine shafts 80–1 200 mm diameter, up to 24 m single-piece length and 80 t finished weight. Full CNC turning, deep-hole boring and spline milling meet IACS UR M68 and customer drawings.   Performance Quench-temper produces 450–650 MPa yield, 700–900 MPa tensile, ≥35 J at 0 °C Charpy; mechanical properties are verified at 1/4-radius. 100 % UT to EN 10228-2 Class 3 and MT to ASTM E709 guarantee freedom from cracks; straightness ≤1 mm/m and dynamic balance to ISO 21940 G2.5 eliminate onboard vibration.   Features 360° forged fiber flow doubles fatigue strength versus welded assemblies; integral flame-hardened or induction-hardened journals reach 55 HRC with 8 mm case depth. Central 40 mm pilot bore reduces weight 12 % and allows condition-moni…