Abstract: The effect of Ca-Si wire and FeS adding sequence on morphology of sulfide and cutting performance of low carbon structural steel (/% ：0.16C, 0.65Mn, 0.25Si, 0.034S, 0.025P) is studied by using a 10 kg induction furnace. Based on inclusion modification treatment of nonmetallic inclusions in steel, with using Image Pro Plus analysis software quantitatively to analyze the inclusions indexes, it is obtained that with using the mode of adding Ca-Si wire first, then adding FeS, the average length of inclusions in steel is 12. 3  μm and the amount of string inclusions and amount of granular inclusions in steel are respectively 64/mm² and 41/mm² , while with using the mode of adding FeS first, then adding Ca-Si wire, the average length of inclusions in steel is 9. 9 μm, and the amount of string inclusions and amount of granular inclusions in steel are respectively 52 /mm² and 53 /mm², and the cutting performance is better than that with using first adding Ca-Si wire mode. The first adding FeS then adding Ca-Si wire mode is favorable to control the morphology of sulfide in steel.

Key words:  , Low Carbon Structural Steel, Calcium Treatment, FeS alloying Mode, Gutting Performance

摘要： 通过10 kg感应炉研究了Ca-Si线与FeS加入次序对低碳结构钢(/%:0.16C,0.65Mn,0.25Si,0.034S,0.025P)硫化物形貌和切削性能的影响。以钢中非金属夹杂物变形处理为基础,采用Image Pro Plus软件对钢中夹杂物指标进行定量分析,得出采用先加入Ca-Si线后加FeS的合金化模式时,钢中夹杂物平均长度为12.3μm,单位面积上条状夹杂物与粒状夹杂物之比为64:41,而采用先加FeS后加Ca-Si线的合金化模式,钢中夹杂物平均长度为9.9μm,单位面积条状夹杂物与粒状夹杂物数量之比为52:53,且钢样的切削性能较先加Ca-Si线模式好,因此先加FeS后加Ca-Si线的合金化工艺有利于控制钢中硫化物形态。