Effect of Heat Treatment and Tempering Process on the Hardness of S55c Steel as A Cutting Blade Material for Plastic Shredding Machines

Keywords: S55C Steel, Heat Treatment, Quenching, Taguchi Method, Tempering

Abstract

Purpose of the study: This study aims to optimize the heat treatment process of S55C medium-carbon steel by examining the combined effects of austenitizing temperature, quenching media, and tempering temperature on impact toughness.

Methodology: An experimental approach was employed using quenching and tempering treatments. Quenching was performed at three austenitizing temperatures (950°C, 1000°C, and 1050°C) with three different cooling media—salt water, oil, and seawater—followed by tempering at 100°C, 200°C, 300°C, and 400°C. All heating processes were conducted in an electric furnace. Parameter optimization was carried out using the Taguchi method with an L9 orthogonal array. Mechanical performance was evaluated through Charpy impact testing, and confirmation experiments were conducted to validate the optimal parameter combination.

Main Findings: The Taguchi analysis identified the optimal quenching condition at an austenitizing temperature of 1050°C with salt water as the cooling medium, yielding the highest impact toughness. Confirmation tests supported the reliability of this result. Additionally, the tempering process showed that increasing the tempering temperature decreased hardness while significantly improving toughness, indicating effective stress relief and improved ductility in the steel microstructure.

Novelty/Originality of this study: The novelty of this study lies in the integrated optimization of quenching temperature and diverse cooling media, including seawater, using the Taguchi method, with a specific focus on toughness rather than hardness alone. This research provides new insights into tailoring heat treatment parameters for S55C steel to achieve superior impact resistance, offering practical guidance for more efficient and application-oriented heat treatment strategies in manufacturing industries.

Author Biographies

Eko Yudo, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Ariyanto Ariyanto, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Erwansyah Erwansyah, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Zaldy Sirwansyah Suzen, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Sugiyarto Sugiyarto, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Yuli Dharta, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

Zulfitriyanto Zulfitriyanto, Politeknik Manufaktur Negeri Bangka Belitung

Department of Mechanical Engineering and Manufacturing, Politeknik Manufaktur Negeri Bangka Belitung, Kepulauan Bangka Belitung, Indonesia

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Published
2026-01-11
How to Cite
[1]
E. Yudo, “Effect of Heat Treatment and Tempering Process on the Hardness of S55c Steel as A Cutting Blade Material for Plastic Shredding Machines”, In. Sci. Ed. J, vol. 7, no. 1, pp. 127-136, Jan. 2026.
Issue
Vol. 7 No. 1 (2026): January
Section
Articles

Copyright (c) 2026 Eko Yudo, Ariyanto Ariyanto, Erwansyah Erwansyah, Zaldy Sirwansyah Suzen, Sugiyarto Sugiyarto, Yuli Dharta, Zulfitriyanto Zulfitriyanto

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