Ramírez, L., Rodríguez, N., Simbaña, I. and Saquinga, D. 2024. Analysis Of the Effect of Vegetal and Coking Coals on the Surface Hardness of Carburized AISI 8620 Steel. Enfoque UTE. 15, 1 (Jan. 2024), 1-6. DOI:https://doi.org/10.29019/enfoqueute.997.