Rahmadi , Hairian, et al. “Effect of Pack Carburizing Temperature on the Surface Hardness of ST37 Low Carbon Steel Using Coconut Shell Charcoal: Pengaruh Temperatur Pack Carburizing Terhadap Kekerasan Permukaan Baja Karbon Rendah ST37 Menggunakan Arang Tempurung Kelapa”. Logic : Jurnal Rancang Bangun Dan Teknologi, vol. 26, no. 2, July 2026, pp. 112-9, doi:10.31940/logic.v26i2.112-119.