Analysis of Factors Affecting Accuracy of Tensile Test to SAWL Steel Pipe

Analyzed here in the paper are the regularities of influences on the tensile test result by various factors, including sampling, specimen flattening and processing of the linepipe and the tensile ratio. And the control requirements for improving the data accuracy of the tensile test are presented. It is concluded via the analysis that in case of taking the sample from the steel pipe with flame cutting method, the length of the sample should be determined as per the OD and WT of the pipe, and the test sample should not be taken at a position under 50 mm;the overall length of the sample can be properly reduced by means of the on-line water-cooling process;compared with the room temperature strain aging, the strain aging with the temperature over 210 ℃ produces more obvious influence on the tensile property, while compared with the specimen flattening frequency, the unevenness of the plate tensile specimen produces much more influence on the yield strength.