B. Tawfik M, A. Mohammed K. 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. [Internet]. 2010 Jun. 1 [cited 2025 May 5];14(2):1-16. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1453