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概要:
快削鋼として，その使い勝手の良さから，Pb添加快削鋼が広く使用されてきた。しかしながら，地球環境問題から素材メーカーに対して，Pbフリー快削鋼の要望が強まりつつある。Pbフリー化には種々の選択肢があるが，当社では，黒鉛と物理的性質の類似している六方晶BNを含有させることによる快削化の可能性の検討を行い，確立したので紹介する。
Abstract:
Lead-added free cutting
steel has been widely used because it has good machinability
under various cutting conditions. Furthermore, free cutting
steel without lead addition is increasingly being in demand
for steel maker because of environmental problems. There
are a variety of free cutting steels without lead addition,
but we have investigated free cutting steel containing hcp-BN
(Boron Nitride) inclusions which are similar physical characteristics
to graphite, and established this new free cutting steel.
This paper presents an outline of free cutting steel containing
BN inclusions.
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