YUDO, E.; ARIYANTO, A.; ERWANSYAH, E.; SUZEN, Z. S.; SUGIYARTO, S.; DHARTA, Y.; ZULFITRIYANTO, Z. Effect of Heat Treatment and Tempering Process on the Hardness of S55c Steel as A Cutting Blade Material for Plastic Shredding Machines. Integrated Science Education Journal, v. 7, n. 1, p. 127-136, 11 Jan. 2026.