Abstract：The upgrading of steel for thermal power plant and nuclear power plant equipment puts forward higher requirements for the evaluation of high-temperature service performance of heat-resistant steel. Therefore, the accurate and reliable data in creep test are particularly important. In this study, 316H stainless steel plate for nuclear power was selected as the research object. The influence of sampling position, sampling size and equipment difference on creep test results was discussed through a series of high temperature creep tests. Affected by the production process, the creep resistance of the material in the middle (1/2 position) of the 316H stainless steel plate was significantly different from that in the surface (1/4 position or 3/4 position), and the total creep strain of the material in the middle was 44% lower than that of the upper material, indicating that the sampling position had a great impact on the creep test results of stainless-steel plate. The creep test results of the sample with parallel section diameter of 10 mm and the sample with parallel section diameter of 5 mm had little difference, and the total creep strain difference was about 11%, indicating that the specimen size had little influence on the creep test results. Affected by the equipment difference, the creep test results of samples with the same sampling position and specimen size had little difference. The relative standard deviation of the total creep strain tested by 30 creep testing machines was about 9.5%, indicating that the equipment difference had little impact on the creep test results of stainless-steel plates. When the equipment calibration was qualified, the influence of the equipment difference on the creep test results could be ignored.
2023, Vol. 41 
