Several Problems in Strength Testing of High Grade HSAW Pipe

Tensile property is the most important and basic property parameter, which is the base of pipeline design and safety assessment. This paper analyzes several issues such as the type of specimen and the test procedure, which occur during the strength testing of X80 HSAW pipe. It is presented that the yield strength value of base metal in transverse direction of X80 HSAW pipe from different kinds of specimen may be affected by many factors, such as Bauschinger effect, deformation strengthening effect and microstructure etc. It is suggested that the total elongation for high grade HSAW pipe in total extension under load method should be verified by ring expansion test.Copyright © 2007 by ASME