TAGUCHI OPTIMIZATION OF X70 CARBON STEEL HEAT TREATMENT: A STUDY ON HARDNESS, THICKNESS AND PHASE ANALYSIS. Jurnal Teknologi (Sciences & Engineering), [S. l.], v. 87, n. 5, p. 1007–1014, 2025. DOI: 10.11113/jurnalteknologi.v87.23474. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/23474.. Acesso em: 5 dec. 2025.