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All Journal Manutech : Jurnal Teknologi Manufaktur Integrated Science Education Journal
Zulfitriyanto Zulfitriyanto
Politeknik Manufaktur Negeri Bangka Belitung
Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Effect of Heat Treatment and Tempering Process on the Hardness of S55c Steel as A Cutting Blade Material for Plastic Shredding Machines Eko Yudo; Ariyanto Ariyanto; Erwansyah Erwansyah; Zaldy Sirwansyah Suzen; Sugiyarto Sugiyarto; Yuli Dharta; Zulfitriyanto Zulfitriyanto
Integrated Science Education Journal Vol 7 No 1 (2026): January
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/isej.v7.i1.2461

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.
Optimasi Parameter Terhadap Pengujian Material Removal Rate Menggunakan Baja ST 41 Pada Mesin CNC Bubut Dengan Metode Taguchi Devfrans Pasa; Yudi Oktriadi; Zulfitriyanto Zulfitriyanto
Manutech : Jurnal Teknologi Manufaktur Vol. 18 No. 01 (2026): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v18i01.700

Abstract

In the manufacturing industry, the efficiency of the machining process is a crucial factor that directly impacts productivity and production costs. Material Removal Rate (MRR) is a primary indicator for measuring this productivity, where a high MRR value is highly desirable to reduce machining time. This study aims to determine the optimal values and the most influential variables affecting MRR in the turning process of ST 41 steel using a CNC machine. The Taguchi method with an L9 (3³) orthogonal array was applied to investigate the influence of three machining parameters: cutting speed, feed rate, and depth of cut. The results, analyzed using Analysis of Variance (ANOVA), indicate that the depth of cut is the most significant factor in influencing MRR, with a contribution of 61.165%. The optimal parameter combination to achieve the maximum MRR of 689.274 mm³/s is a cutting speed of 130 m/min, a feed rate of 0.4 mm/rev, and a depth of cut of 1.5 mm.
Co-Authors Devfrans Pasa Eko Yudo Erwansyah, Erwansyah Oktriadi, Yudi Sugiyarto Sugiyarto Suzen, Zaldy Sirwansyah Yuli Dharta