为了分析35CrMnSi低合金高强度钢在拉伸试验中断面收缩率偏低的原因，利用直读光谱仪、氧氮氢分析仪、金相显微镜、扫描电镜及能谱仪等对拉伸试样的成分、残余氢、显微组织、断口形貌、夹杂物等进行了观察和分析。结果表明：35CrMnSi钢拉伸试样中存在一定量氢，在拉伸应力的共同作用下，产生的“鱼眼”缺陷是导致拉伸试样断面收缩率偏低的主要原因。

In order to analyze the reason for the low reduction of area of 35CrMnSi low alloy high strength steel in tensile test, the composition, residual hydrogen, microstructure, fracture morphology and inclusions of the tensile sample were observed and analyzed by direct reading spectrometer, oxygen-nitrogen hydrogen analyzer, metallographic microscope, scanning electron microscope and energy spectrometer. The results show that there was a certain amount of hydrogen in the tensile specimen of 35CrMnSi steel. Under the combined action of tensile stress, the “fish-eye” defect was the main reason for the low reduction of area of the tensile specimen.