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<p>The present study investigated the thermophysical properties of iron oxide scale in the temperature range of 27-1000&#xa0;°C. Oxide scales with an average thickness of 2.9&#xa0;mm were successfully fabricated using an industrial walking-beam type reheating furnace with direct combustion of fuel and air for hot rolling of steels. Most of the oxide scale was composed of wüstite, with a thin layer of magnetite formed at the air-exposed surface. Thermal expansion coefficient (<i>β</i>) of the iron oxide scale increased with temperature, and converged to a single value at high temperatures. The average <i>β</i> of the oxide scale was approximately 13x10<sup>-6</sup>&#xa0;°C<sup>-1</sup>, and it was slightly lower than that of the steel. The density (<i>ρ</i>) of oxide scale decreased with increasing temperature owing to the behavior of <i>β</i> in oxide scale. The specific heat capacity (<i>c</i><sub>p</sub>) of the oxide scale increased with temperature although some fluctuations existed with temperature due to the Curie point of magnetite. Excluding sharp peak of <i>c</i><sub>p</sub> around 750&#xa0;°C in the steel, the <i>c</i><sub>p</sub> of oxide scale was slightly higher than that of the steel. The thermal diffusivity (<i>α</i>) of the iron oxide scale was approximately 0.45&#xa0;mm<sup>2</sup>/s, and did not change much with temperature. It was significantly lower than that of the steel. The thermal conductivity (<i>k</i>) of the oxide scale ranged between 1.5 and 2.1&#xa0;W/m<sup>o</sup>C depending on the temperature, and it was approximately 17 times lower than that of steel. The <i>k</i> of the oxide scale increased with temperature due to the influence of <i>c</i><sub>p</sub> in oxide scale.</p>

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Thermophysical Properties of Oxide Scale on Carbon Steel in Industrial Reheating Furnace

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Sangbum Woo,
  • Yeo-Jun An,
  • Joong-Ki Hwang

摘要

The present study investigated the thermophysical properties of iron oxide scale in the temperature range of 27-1000 °C. Oxide scales with an average thickness of 2.9 mm were successfully fabricated using an industrial walking-beam type reheating furnace with direct combustion of fuel and air for hot rolling of steels. Most of the oxide scale was composed of wüstite, with a thin layer of magnetite formed at the air-exposed surface. Thermal expansion coefficient (β) of the iron oxide scale increased with temperature, and converged to a single value at high temperatures. The average β of the oxide scale was approximately 13x10-6 °C-1, and it was slightly lower than that of the steel. The density (ρ) of oxide scale decreased with increasing temperature owing to the behavior of β in oxide scale. The specific heat capacity (cp) of the oxide scale increased with temperature although some fluctuations existed with temperature due to the Curie point of magnetite. Excluding sharp peak of cp around 750 °C in the steel, the cp of oxide scale was slightly higher than that of the steel. The thermal diffusivity (α) of the iron oxide scale was approximately 0.45 mm2/s, and did not change much with temperature. It was significantly lower than that of the steel. The thermal conductivity (k) of the oxide scale ranged between 1.5 and 2.1 W/moC depending on the temperature, and it was approximately 17 times lower than that of steel. The k of the oxide scale increased with temperature due to the influence of cp in oxide scale.