本报告研究了30CrM_nS_iA 钢 Ml0×1螺栓在加上予紧力矩后再继续承受轴向拉伸载荷时的承载能力问题。试验表明:予紧力矩并不削弱螺栓本身的实际承载能力。即若所加的初始予紧力矩值是在材料的强度限以内时,则螺栓承载轴向拉伸载荷的能力不受初始予紧力矩值的影响。 This report investigates the bearing capacity of 30CrM_nS_iA steel Ml0 × 1 bolt with the additional tightening torque and then withstanding the axial tensile load. Tests show that: the tightening torque does not weaken the actual carrying capacity of the bolt itself. That is, the ability of the bolt to carry the axial tensile load is not affected by the initial tightening torque value if the initial tightening torque applied is within the material strength limits.