18Cr-2Mo系超快削ステンレス鋼 (快削鋼<特集>)

概要

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The effects of free-machining elements, S, Pb, Se and Te on the machinability and corrosion resistance of the 18Cr-2Mo stainless steel were investigated. Good drillability is obtained by all these additives. Much longer life is obtained through the built-up layer formation promoted by S addition for high speed turning with carbide tools.However, since this layer reduces the finished surface texture, complex addition of Pb and Te with S is necessary.Se has the similar effect on machinability as S.S addition gives the worst corrosion resistance among these additives, and Pb, Se and Te cause little degradation.The new gradé Super free-machining stainless steel, which contains S, Pb and Te, has better machinability than low carbon free-machining steel containing S, Pb and Te, and almost the same machinability as Brass. The corrosion resistance of the steel bears comparison with SUS303 steel.
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