SS400中厚板横向伸长率不合格的原因分析
Reason Analysis of SS400 Plate Specimens with Incompetent Transverse Elongation
孟庆刚, 冯光宏, 于桂玲, 张江玲
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作者单位：(钢铁研究总院 冶金工艺研究所, 北京 100081)
中文关键字：伸长率； 硫化物； 带状组织； 铁素体魏氏组织
英文关键字：elongation; sulfide; banded structure; widmanstatten ferrite
中文摘要：从现场生产的横向伸长率不合格钢板中取样，进行了夹杂物检验和金相检验，并用扫描电镜对拉伸断口进行观察和分析。结果表明，铸坯凝固过程中的偏析导致的低温转变组织和分布于其中硫化物，以及在试样中发现的不良组织是引发伸长率不合格的三个重要原因。并且根据现场生产条件提出了工艺优化建议，试生产后，钢板横向伸长率得到了明显提高。
英文摘要：The metallurgical in elusions of a sample taking from the steel plates with incompetent transverse was checked, and the morphology of the tensile fracture was observed by SEM. The results show that the precipitations of the casting plate during solidification process result in the appearance of the low-temperature transformation microstructure, sulfide distributes in the above microstructure and the widmanstatten ferrite generates in the center of the plate, which cause elongation incompetent. Finally, several optimization processes are proposed and proved by practical production, that is, the elongation of SS400 plate obviously improves.