通过采用提高电炉炼钢铁水比、强化脱磷、高碱度精炼炉渣、直接脱氧和强扩散脱氧等工艺措施，生产出了w(［P］)＝0.005％、w(T［O］)＜0.001％的高纯净度非调质钢。研究中发现，在铸坯柱状晶与中心等轴晶带的边界处，C、P、S、Mn发生较大的正偏析。钢中的非金属夹杂物主要有MnSMnO类夹杂物和TiNVN类析出物2个类型，其中MnSMnO类夹杂物中MnS的质量分数为70%～81%，为塑性夹杂物。TiNVN类夹杂物中TiN的质量分数为72％～85% ，在轧制过程不变形。
High purity hot forged steel for automotives with 0.005% of w(［P］) and less than 0.001% w（T［O］） has been produced by means of increasing hot metal charging ratio, strengthening dephosphurization in EAF, strong direct and indirect deoxidations, etc. It was found that more segregations of C, P, S and Mn occurred at the boundaries between the columnar grains and equiaxed grains. There were mainly two types of nonmetallic inclusions in the steels, which were the MnSMnO typed inclusions and TiNVN typed inclusions. The MnSMnO type inclusions contained 70%81% MnS and were plastic inclusions. While, the TiNVN type inclusions contained 72%85% TiN and were unformable inclusions during hot deformation.
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