Development of Φ1 219 mm×22 mm LSAW Pipe in Mo-containing X80 Steel Grade

The Φ1 219 mm×22 mm LSAW pipe in Mo-containing X80 steel grade is developed for the project of "No.2 Line of West-East Gas Transmission Pipeline System", covering such activities as studying of the weld- ability of the steel plate in Mo-containing X80 steel grade and weakening of the heat-affected area, comparative tensile test analysis between the result of the test made with a rectangular test piece and that of the test made with a round bar test piece, and the comparative analysis of the main properties between the HTP pipe and the Φ1 219 mm×22 mm LSAW pipe in Mo-containing X80 steel grade. It is proposed that round bar test piece be used for tensile test of the heavy-wall X80 steel linepipe.