某批次薄壁SA-213M T22钢管洛氏硬度测试结果偏低，通过室温拉伸试验和采用5种方法进行洛氏硬度测试，结合室温拉伸试验结果对不同洛氏硬度测试方法进行了对比分析。结果表明：如果直接在薄壁钢管表面进行表面洛氏硬度测试或洛氏硬度测试，管壁支撑不足会造成试样变形导致测试结果偏低；如果薄壁钢管中间加圆柱支撑，由于不能确保压头轴线和载荷加载方向与钢管表面垂直，且钢管外表面与贴合的圆柱支撑有间隙钢管圆弧面与贴合的圆柱支撑面存在间隙，也会造成测试结果偏低。采用将钢管取样镶嵌抛光后将测得的维氏硬度转换为洛氏硬度的方法，或者采用去除钢管表面氧化皮和脱碳层并在外表面加工出试验平面并镶嵌后，将测得的表面洛氏硬度转换为洛氏硬度的方法，得到的洛氏硬度测试结果比较准确。

The Rockwell hardness test results of a batch of SA-213M T22 steel thin wall pipe was relatively low. Through the room temperature tensile test and five methods of Rockwell hardness test, combined with the results of the room temperature tensile test, the different Rockwell hardness test methods were compared and analyzed. The results show that if the surface Rockwell hardness test or Rockwell hardness test was carried out directly on the surface of the steel thin wall pipe, the insufficient support of the pipe wall would cause the deformation of the sample and resulted in the low test result; if the steel thin wall pipe was supported by a cylinder in the middle, the axis of the indenter and the loading direction could not be ensured to be perpendicular to the surface of the steel pipe, and the outer surface of the steel pipe had a gap with the cylindrical support There was a gap between the surface and the supporting surface of the cylinder, which would also result in low test results. By using the method of converting the measured Vickers hardness to Rockwell hardness after sampling, inlaying and polishing the steel pipe, or the method of removing the oxide skin and decarburized layer on the steel pipe surface, machining the test plane on the outer surface and inlaying, converting the measured surface Rockwell hardness to Rockwell hardness, the Rockwell hardness test result was more accurate.