Maulana, Erizal, and Mohamad Nasrun. “Pengaruh Proses Hardening Dan Variasi Suhu Tempering Pada Kekerasan Dan Kuat Impact Baja SS 201”. Piston: Journal of Technical Engineering, vol. 3, no. 2, Oct. 2020, pp. 21-25, doi:10.32493/pjte.v3i2.7224.