对X80管线钢进行单轴拉伸试验和小冲杆试验，通过将两者相关联，研究了试样厚度对小冲杆试验得到的弹性模量、屈服载荷、最大载荷的影响，并给出了以厚度为自变量的X80管线钢屈服强度、抗拉强度经验公式。结果表明：小冲杆试验得到的屈服载荷、最大载荷与试样厚度的平方成线性关系；由建立的经验公式计算得到的屈服强度和抗拉强度受厚度的影响较小，与单轴拉伸试验结果的最大相对误差分别为11.2%，12.3%。

The uniaxial tensile test and small punch test of X80 pipeline steel were carried out. The influence of specimen thickness on the elastic modulus, yield load and maximum load obtained by small punch test was studied by correlating the two test results. The empirical formulas of yield strength and ultimate tensile strength with thickness as independent for X80 pipeline steel were given. The results show that the yield load and maximum load obtained by the small punch test had a linear relationship with the square of specimen thickness. The yield strength and tensile strength calculated from the established empirical formulas were less affected by the thickness, and the maximum relative errors from the uniaxial tensile test results were 11.2% and 12.3%, respectively.