Influence of sample size measurement methods on mechanical properties of steel pipe

For the tensile test of steel pipe products, the national standard, the american standard and the ISO standard had different requirements for measuring method of the sample size. The steel pipe products had rolling characteristics, and the wall thickness was uneven. The measurement accuracy of the wall thickness had a great impact on the control of the test error. Different standard sample size measurement methods were compared, and two standard methods were selected to carry out tensile test on the steel pipe arc sample. The tensile test results were compared, and the influence of sample size measurement method on the mechanical properties of steel pipe was studied.