Analysis of Weld Joint Characteristics in TMC Pipeline Steel of Grade API X65

This paper reports the results of recent investigation on weld joint properties in gas transportation pipeline steel of grade API X65, produced by thermo mechanical control rolled (TMC) schedules. This steel is largely used in Iran gas piping systems and networks. The results from laboratory study are used to measure and compare weldment mechanical characteristics and its chemistry with those specified by standard code (API 5L) for this particular steel. Additionally, microstructural evolution, standard SEM fractography, and mechanical properties of the weldment were experimentally analysed. The variation in hardness, tensile properties and Charpy impact toughness in different zones of the weld joint were determined, and compared with the expected requirements of according to API standard for X65 linepipe steel

کلیدواژه ها:

Weld joint ، Gas pipeline ، API X650 steel ، Impact toughness