Suandi, Ari (2025) Pengaruh Heat Treatment Pada Sifat Mekanis Dan Ketahanan Korosi Baja Karbon Rendah. Other thesis, Universitas Islam Riau.

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Abstract

Low carbon steel ASTM A-36 is widely used in structural construction due to its strength, toughness, and ease of processing. This study aims to analyze the effect of heat treatment with variations in cooling media on the mechanical properties and corrosion resistance of this steel. Heat treatment was conducted at 850°C for 50 minutes, followed by cooling using oil, air, and furnace. Testing included tensile tests, microstructure analysis, and corrosion tests using the weight loss method with a saline solution. The results showed a maximum tensile strength of 405.9 MPa with air cooling, whereas without heat treatment, the tensile strength was only 373.7 MPa. The maximum elongation of 17.50% was obtained with oil cooling, while the minimum elongation of 8.85% was observed in the untreated specimens. Microstructure analysis revealed that fine pearlite in oil cooling improved toughness, while furnace cooling resulted in larger grain structures that were softer. In the corrosion test, air cooling showed the lowest weight loss and corrosion rate, with the smallest corrosion rate of 0.085 mm/y achieved in the aircooled specimens. Air cooling was proven to provide the best balance of strength, toughness, and corrosion resistance, making it the optimal choice for structural applications.

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