根据GB/T 228.1-2010《金属材料 拉伸试验 第1部分：室温试验方法》，利用WEW-600型万能材料试验机对某钢厂生产的IF热轧钢板进行了拉伸试验，分析了拉伸试验的不确定度来源，并对每个不确定度分量逐一进行了评定，最终给出了扩展不确定度及测量结果的不确定度报告。结果表明：该拉伸试验的不确定度来源主要包括试验机、量具和试验结果数据修约3个部分；当包含因子k=2时，该IF热轧钢板的下屈服强度ReL=(264±11） MPa，抗拉强度Rm=(318±13) MPa，断后伸长率A=47.5%±0.3%。该方法对金属材料拉伸试验的不确定度评定有一定的参考价值。

According to GB/T 228.1-2010 Metallic Materials-Tensile Testing-Part 1: Method of Test at Room Temperature, tensile test was carried out on IF hot-rolled steel plate by WEW-600 universal material testing machine. The sources of uncertainty of tensile test were analyzed, every uncertainty component was evaluated, and finally the expanded uncertainty and the measurement uncertainty report were offered. The results show that the sources of uncertainty of the tensile test mainly included three aspects: testing machine, measuring tools and test results rounding. When the coverage factor k=2, the lower yield strength of the IF hot-rolled steel plate ReL=(264±11) MPa, the tensile strength Rm=(315±13) MPa, and the percentage elongation after fracture A=47.5%±0.3%. This method had certain reference value for uncertainty evaluation of tensile test for metallic materials at room temperature.