Effec of Composition of Pack Carburizing with Durian Peel Charcoal on the Hardness Value of St 41 Steel By: Affini Monica Zairoh NIM: 06121182025007 Mechanical Engineering Education Study Program ABSTRACT Pack carburizing is a heat treatment process with the aim of determining the effect of the caralyst composition and durian skin carbon on the hardness value. The catalyst used in this reseacrh…