Abstract
A procedure for predicting the fatigue life of mechanical components is employed to check the possibility of using microalloyed steels for the production of steering knuckles for commercial vehicles. The reliability of the procedure adopted has been confirmed by the results of fatigue bench tests conducted on quenched and tempered conventional steering knuckles and prototype knuckles made from 900 MPa class microalloyed steel. The fatigue life prediction results obtained for four commercial microalloyed steels indicate the possibility of also using these for the construction of mechanical parts subjected to service fatigue loads for which good toughness and mechanical strength are required.
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