中低碳高锰钢塔形试样酸浸检验时经常发现存在疑似发纹，该“发纹”深度较浅，长度经常超过30 mm，甚至贯穿整个台阶，有别于传统意义上的发纹缺陷。通过酸浸检验、磁粉探伤、金相检验等方法对疑似发纹的形成原因进行了试验研究。结果表明：中低碳高锰钢的疑似发纹为钢材中带状组织在酸浸条件下产生的线条状腐蚀痕迹；采用磁粉探伤可有效防止误判。

Suspected hairlines were often found in medium and low carbon high manganese steel in etching test of tower samples. The suspected hairlines were shallow in depth, and length of them often exceeded 30 mm, even through the whole step, which were different from traditional hairline defects. Formation causes of suspected hairlines were experimental studied by etching, magnetic particle inspection and metallographic examination. The results show that suspected hairlines of medium and low carbon high manganese steel were linear corrosion marks of banded structure produced in etching. Magnetic particle test can effectively prevent the misjudgment.