采用金相检验、非金属夹杂物对比的方法对国内外C70S6钢进行分析。结果表明:国外材料的致密性好,而国内材料的枝晶偏析严重,且带状组织较国外材料严重;国外材料的硫化物形貌以短杆的纺锤体状为主,有利于提高切削性能,而国内材料的硫化物以细长状为主;国内材料中含有较大颗粒的非金属夹杂物,其钢水纯净度较国外材料差。

The foreign and domestic C70S6 steels were analyzed by metallographic examination and non-metallic inclusion comparison. The results show that the compactness of foreign materials was good, while the dendrite segregation of domestic materials was serious, and the banded structure was more serious than that of foreign materials. The sulfide morphology of foreign materials was mainly short rod spindle, which was beneficial to improve the cutting performance, while the sulfide of domestic materials was mainly elongated. Domestic materials contained larger particles of non-metallic inclusions, its molten steel purity was worse than foreign materials.