DOI: https://doi.org/10.14710/teknik.v42i2.37221

The development of a588 modified laterite steel using thermomechanical and low-temperature tempering process for weather resistant steel

Pengembangan Baja Laterit Modifikasi A588 Menggunakan Proses Termomekanikal Diikuti dengan Proses Temper Temperatur Rendah untuk Aplikasi Baja Tahan Cuaca

*Miftakhur Rohmah orcid scopus  -  Pusat Penelitian Metalurgi dan Material, Lembaga Ilmu Pengetahuan Indonesia, Indonesia
Dedi Irawan  -  Pusat Penelitian Metalurgi dan Material, Lembaga Ilmu Pengetahuan Indonesia, Indonesia
Dedi P. Utama  -  Pusat Penelitian Metalurgi dan Material, Lembaga Ilmu Pengetahuan Indonesia, Indonesia
Toni B. Romijarso  -  Pusat Penelitian Metalurgi dan Material, Lembaga Ilmu Pengetahuan Indonesia, Indonesia
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Abstract
Laterite Steel A-588 has the potential to be a high strength low alloy for Corten steel application. Laterite steel A-588 is developed through a thermomechanical process followed by a tempering process to obtain high strength and corrosion resistance. This study aims to determine the correlation between the addition of nickel content, the variation of the cooling rate during heat treatment to the mechanical properties, and the corrosion resistance of A-588 laterite steel. The Cu, Cr, Ni, P, and Si elements significantly impact microstructure transformation. Laterite Steel A-588 with nickel and thermo-mechanical process variation has been focused on in this research. Laterite steel with 0,42%, 1%, 2%, and 3% nickel varied was homogenized, hot rolled, and heat treated with three cooling variations by water, oil, and air. They are processed with 150 C tempering. Low tempering temperature caused fine carbide precipitation and phase transition of martensite to bainite. This resulted in bainite as the final microstructure, lath tempered martensite, carbide, and ferrite. 3% Ni with a fast cooling rate increased the tempered martensite and bainite phase formation. It allowed the strength and hardness to increase relatively, followed by decreased elongation and corrosion resistance caused by the galvanic reaction. Most optimal of mechanical properties determined at a sample with 2% nickel in a water medium (strength 1203 MPa, elongation 10%, hardness 404 BHN, corrosion rate 1,306 mpy).
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Keywords: lateritic steel a-588; martensite tempered; low temperature temper; thermomechanical

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Language : EN
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