“TAGUCHI OPTIMIZATION OF X70 CARBON STEEL HEAT TREATMENT: A STUDY ON HARDNESS, THICKNESS AND PHASE ANALYSIS”. Jurnal Teknologi (Sciences & Engineering) 87, no. 5 (August 22, 2025): 1007–1014. Accessed December 5, 2025. https://journals.utm.my/jurnalteknologi/article/view/23474.