Determination of ductile-to-brittle transition temperature of NIOMOL 490K steel welded joints

This paper is devoted to the ductile–brittle transition behavior of high strength low alloyed structural steel NIOMOL 490K. grade designed for welded pressure vessels exposed dynamic loads, operating at temperatures below zero, and that why it must have acceptable toughness. Due its importance safety assessment vessels, a characterization this with Charpy V-notch test in range temperature between-60 ⁰C +60 was undertaken. Ductile-to-brittle curves were generated present study by using instrumented pendulum impact on specimens. Notches located parent material, heat-affected zone weld metal. The nil-ductility tensile properties from -60 are presented paper. We used different better understand ductile-to brittle response than just use either energy or other related ductility criteria.