The amount, size and distribution of non-metallic inclusion in different positions of hard wire steel with different diameters were investigated by optical microanalysis.
采用光学显微分析法在不同直径硬线钢的不同部位，分析了非金属夹杂物的数量、大小和分布特征。
The results showed that the major cause of reducing diameter was more non-metallic inclusion in the steel than standard value, billet segregation and shrinkage void.
用扫描电镜、大型金相显微镜观察分析高碳钢盘条的缩径，结果表明：造成缩径的主要原因是盘条中的非金属夹杂物超标、方坯偏析和缩孔。
Test results show that non-metallic inclusion and bainite structure in the steel are main factors affecting the elongation.
试验结果表明：钢中非金属夹杂物和贝氏体组织是影响伸长率的主要因素。
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