用钢水吹氢技术对攀钢生产的U71Mn重轨钢进行了临界氢含量试验。结果表明,这种钢钢水的氢含量为2.5ppm时,成品中未出现白点;当钢水氢含量增加到3.3—5.8ppm时,部分钢坯中形成白点;当钢中Mn含量增加时,出现白点的氢含量将下降。还观察到钢中生成白点的孕育期是不确定的。
The content of hydrogen allowed in U71Mn heavy rail steel, produced by the Panzhihua Iron and Steel Company, was investigated by technique of hydrogen blowing into molten steel. Experimental results revealed that the critical hydrogen content is limited to 2.5 ppm. If the content in melt increases to 3.3—5.8 ppm, the flakes may form in the steel. And it will further drop as the increase of Mn contained. It was also observed that the incubation period for flake forming seems to be undetermined.
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