高品質鉛快削鋼(ULO-M)の特性について

概要

論文の詳細を見る
Influence of lead, sulfur and oxygen contents on various properties of steels for machine structural use has been studied. Lead and sulfur improve machinability but deteriorate rolling contact fatigue strength and cold workability. Sulfur is more harmful for cold workability than lead. Oxygen is harmful for machinability, fatigue strength rolling contact fatigue strength and cold workability.Based on the fundamental studies, High Quality Leaded Free-Machining Steel ULO-M has been developed. ULO-M contains ultra-low oxygen and optimum amount of lead to improve the machinability without lowering fatigue strength and cold workability. Sulfur content of ULO-M can be selected from two levels depending on the necessity of cold workability. ULO-M is an ideal free machining steel which can be applied to high strength parts of automobile and other machines. The good chip breakability of ULO-M helps the operation of automated and unmanned machine shops.
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