通过对断面收缩不合的45＃圆钢进行力学拉伸检验、能谱分析及试样内部高倍组织结构及断口的全面分析，认为钢材内部的氢含量过多是引起这种现象的主要原因。观察大量的试样断口的形貌，发现收缩不合的圆钢断面处都存在不同程度的白点，可断定白点就是引起这种现象的主要原因。
The contraction of the sub-section of 45 # round steel for mechanical tensile testing, spectrum analysis and sample high-powered organizational structure and the internal fracture of a comprehensive analysis that the hydrogen content within the steel is caused by too much the main reason for this phenomenon . Observe the fracture morphology of a large number of samples and found that sub-contraction of the round steel sections exist at different levels of white spots, white spots can be concluded that the main reason for this situation.
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