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以锡替代铅 ,用 2 0kg感应炉熔炼了成分 (% )为 :0 2 0～ 0 2 1C ,0 5 6～ 0 6 0Si,0 78～ 0 80Mn ,0 2 8～ 0 2 9S ,0 0 6 6～ 0 0 70P ,0～ 0 0 4 9Sn易切削钢。试验结果表明 ,加锡可以明显改善钢的切削性能 ,经 6 0min切削 ,高速钢刀具后刀面磨损宽度 (Vb)由切削未加Sn钢的 0 6 0mm降到切削加Sn钢的 0 4 5mm。加锡钢的力学性能与含铅易切削钢相当。扫描电镜和能谱对钢中夹杂物和断口分析表明 ,在含锡钢的晶界和夹杂物附近锡偏聚显著
Lead was replaced by tin, and the composition (%) was melted using a 20 kg induction furnace at 0 2 0-0 2 2 C, 0 56 -6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 80 Mn, 0 2 8 0 2 9 S 0 0 0 6 6 ~ 0 0 70P, 0 ~ 0 0 4 9Sn free cutting steel. The test results show that tin can significantly improve the machinability of the steel. After 60min cutting, the flank wear width (Vb) of the HSS tool decreases from 0 6 0mm of the untreated Sn steel to 0 4 5mm of the cutting plus Sn steel . Mechanical properties of tin plus tin free cutting steel equivalent. Scanning electron microscopy and energy spectrum analysis of inclusions and fractures in steel showed that the segregation of tin near the grain boundaries and inclusions containing tin was significant