The Effect of Niobium and Vanadium on the Toughness of High Strength Alloyed Line Pipe Steel Used in Gas & Oil Pipeline. J. eng. sustain. dev. [انترنت]. 1 يونيو، 2010 [وثق 18 مايو، 2024];14(2):1-16. موجود في: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1453