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12150型柴油机功率大(最大520马力),转速高(2400转/分)。在工作时引起的惯性力、离心力、扭振等,使曲轴循环往复地承受着弯曲、扭转等力,因而产生很大的疲劳应力。曲轴的性能如何,是发动机寿命和工作可靠性最主要的标志。因而曲轴采用18Cr2Ni4WA钢(其化学成份要求为:0.14～0.18％C、0.17～0.37％Si、0.25～0.55％Mn、P、S≤0.03％、1.35～1.65％Cr、4.0～4.5％Ni、0.8～1.2％W),其机械性能要求见表1。疲劳试验要求σ-1≥50kg/mm~2
12150 diesel engine power (maximum 520 horsepower), high speed (2400 r / min). Inertial force, centrifugal force, torsional vibration caused by the work, so that the crankshaft cycle to withstand bending, torsion and other forces, resulting in great fatigue stress. Crankshaft performance how, is the most important symbol of engine life and job reliability. So the crankshaft 18Cr2Ni4WA steel (its chemical composition requirements: 0.14 ~ 0.18% C, 0.17 ~ 0.37% Si, 0.25 ~ 0.55% Mn, P, S ≤ 0.03%, 1.35 ~ 1.65% Cr, 4.0 ~ 4.5% Ni, 0.8 ~ 1.2% W), the mechanical properties of the requirements in Table 1. Fatigue test requires σ-1 ≥ 50kg / mm ~ 2