快削冷鍛用肌焼鋼の開発

概要

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Recently, in manufacturing automotive parts such as gear wheels and shafts, cold forging has come to be widely used. Futhermore, with increasing the number of carburized parts which are produced in the line of cold forging-machining-carburizing, both the properties of cold forgeability and machinability are required.It is difficult, however, to give both these properties to steel. For example, nonmetallic inclusions like sulphides are preferable to enhance machinability, while such inclusions are harmful to cold fogeability.DAIDO STEEL has challenged this problem, and newly developed carburizing steel which has excellent machinability and cold forgeability at the same time.The main results obtained in this research are as follows.(1) By the combination of decrease of S content, addition of Nb and low temperature rolling, good cold forgeability are obtained.(2) Furthermore, by addition of small amont of Pb, machinability is improved extremely, and it is confirmed that cold forgeability and fatigue strength of this new steel are equivalent to conventional steel.
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