Perbandingan Harga Impact Dan Kekerasan Pada Perlakuan Panas Baja Karbon

Carbon steel is widely used in industry due to its mechanical properties, which can be improved through heat treatment. One critical stage in the heat treatment process is cooling, which significantly affects the hardness and toughness of the material. This study aims to analyze the effect of different cooling media on the hardness and impact toughness of ST 50 carbon steel after heat treatment. The specimens were heated to 900°C for 15 minutes and then cooled using water, oil, air, and furnace. The tests conducted were the Rockwell hardness test and Charpy impact test. The results showed that water quenching produced the highest hardness value (51.8 HRB) with the lowest toughness (0.31 J/mm²), while furnace cooling resulted in the lowest hardness (22.5 HRB) but the highest toughness (1.21 J/mm²). These findings indicate an inverse relationship between hardness and toughness, and can serve as a reference in selecting appropriate cooling media based on specific application requirements.