QUALITY EVALUATION OF LINE PIPES BY THE C HEVRON-NOTCHED DROP-WEIGHT TEAR TEST

The WG in High Strength Line Pipe Research Subcommittee of Steel Pipes and Tubes Committee of The Joint Research Society of ISIJ investigate d the applicability of the Chevron Notched Drop Weight Tear Test to Ja panese high toughness line pipes, and developed a new test method, i.e ., the Slit Chevron Notched Drop Weight Tear Test. The effects of the slit width and the notch angle of the specimen was investigated in det ails, and the established method was verified by the burst tests on ac tual pipes. The fracture appearance transition temperature of the esta blished test is a little safe side estimation to the brittle fracture of line pipes, and the impact energy of the test gives the prediction to the ductile crack propagation and arrest in natural gas transmissio n pipelines. It is expected that the developed method serves for the q uality evaluation of high toughness line pipes against brittle fractur e and ductile crack propagation and arrest.