1、 Historically, lead was added to the free cutting steels containing sulfide inclusions, to enhance the machinability.
高切削性能的易切削钢含有铅, 然而铅及其氧化物有毒, 使其应用受到限制.
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2、 From the machinability, the Mo cold cast iron is liable machine.
从加工性能上说,铬钼激冷铸铁比镍铬激冷铸铁加工性能好.
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