微量鉛を含有したCa快削鋼の自動車用クランクシャフトへの適合性

概要

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The crankshafts of a motor vehicle is one of these parts which require such properties of the highest levels with respect to materials used as the machinability including the forgeability, the strength and so on.In the case of crankshafts, it is essential to produce crankshafts that are reliable as to the quality characteristics at the lowest possible cost. However, the free cutting steels containing 0.2% lead has problems such that as its amount used increases and when billets are heated by induction heating in the process of hot forging, the lead contained in the steel evaporates as fume to damage the heating equipment.To solve the problem, we conducted researches on the technical art of materials which make it possible to reduce the lead content to such an extent as necessary for solving the problem and to offset the resultant lowering in the machinability without deteriorating the strength properties by changing the quantities of various elements, such as carbon, sulfur and so forth, so as to ensure a good and steady machinability.
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