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<p>This study investigates the effect of heat treatment on the corrosion performance of API X70 pipeline steel in two corrosive environments: natural seawater and sodium thiosulphate solution. Steel samples were austenitized at 800&#xa0;°C (HT-1), 850&#xa0;°C (HT-2), and 900&#xa0;°C (HT-3), followed by quenching and tempering at 450&#xa0;°C. Electrochemical testing using Linear Sweep Voltammetry (LSV) was performed in a three-electrode cell to evaluate corrosion potential, current density, and corrosion rate via Tafel extrapolation. The 800&#xa0;°C heat treatment (HT-1) resulted in the lowest corrosion rate, particularly in seawater, indicating improved resistance due to microstructural refinement.</p>

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Electrochemical Corrosion Study on Heat-Treated API X70 Steel Used for Pressure Vessel Applications

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Lochan Sharma,
  • Amman Jakhar,
  • Karan Mankotia,
  • Kanika Sharma,
  • Narinder Singh

摘要

This study investigates the effect of heat treatment on the corrosion performance of API X70 pipeline steel in two corrosive environments: natural seawater and sodium thiosulphate solution. Steel samples were austenitized at 800 °C (HT-1), 850 °C (HT-2), and 900 °C (HT-3), followed by quenching and tempering at 450 °C. Electrochemical testing using Linear Sweep Voltammetry (LSV) was performed in a three-electrode cell to evaluate corrosion potential, current density, and corrosion rate via Tafel extrapolation. The 800 °C heat treatment (HT-1) resulted in the lowest corrosion rate, particularly in seawater, indicating improved resistance due to microstructural refinement.