如何保证钢轨淬火质量，是一个十分重要的问题。
Then the paper proposes the idea of "technical assurance on the quenching quality of rail" and deals with its execution method.
本文研究了U 74钢轨表面激光淬火工艺及其对表面耐磨性能的影响。
Laser quenching of U74 steel and its effect on the wear resistance are studied.
结果表明，欠速淬火钢轨的性能达到或超过了进口淬火钢轨的性能指标。
The results show that the properties of the slak quenched rails are matchable or superior to that of the imported rails.
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