高強度歯車用鋼の実用化

概要

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As many of the power train components have to withstand higher loads with increasing engine power, high performance gear steels have been strongly demanded. In accordance with these trends the application study on the high performance gear steel has been conducted.The results obtained from this study are as follows.(1) The chemical composition of the new grade is 0.18C-Si<0.15-0.70Mn-1.0Cr-0.40Mo. This steel is characterized by decreasing strong oxide former, Si and austenite grain embrittling element, P and by increasing Mo content to enhance the case toughness.(2) The new grade shows higher fracture resistance than conventional steels from the both points of view, impact fracture strength and fatigue strength.(3) On the basis of the fundamental and application studies, the new grade has been applied to high performance Nissan passenger cars.
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