依照GB/T 231.1-2009《金属材料布氏硬度试验第1部分：试验方法》对扁钢进行了布氏硬度试验（HBW10/3 000），并对试验结果的测量不确定度进行了评定和总结。结果表明：当包含因子k=2时，采用考虑硬度计最大允许误差的方法测量不确定度评定结果为（323±9）HBW10/3 000，采用考虑硬度计系统误差的方法测量不确定度评定结果为（323±6）HBW10/3 000，两种方法评定结果的差异与源的不确定度大小有关；在日常使用中，布氏硬度计应进行定期的期间核查和检定校准，确保硬度计各部分都在国家标准规定范围内正常工作。

According to GB/T 231.1-2010 Metallic Materials-Brinell Hardness Test-Part1:Test Method, Brinell hardness test (HBW10/3 000) was done to flat-rolled steel sheets, and the measurement uncertainty of the test results was evaluated and summarized. The results show that when the coverage factor k=2 and adopting the method of considering the hardness tester maximum allowable error, the measurement uncertainty of Brinell hardness test was as follows:(323±9) HBW10/3 000; when adopting the method of considering the hardness tester system error, the measurement uncertainty of Brinell hardness test was as follows:(323±6) HBW10/3 000. The difference between these two evaluating results was related to the size of uncertainty source. In daily use, the Brinell hardness testers should be verified and calibrated regularly to ensure that all parts of the hardness tester are working properly within the national standard.