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<p>The worldwide commitment to large-scale CO<sub>2</sub> reductions is forcing steel producers to find improvements to reheating processes for steel slabs. In this study, three practices with potential to lower the carbon footprint of reheating process for steel slabs were studied: use of hydrogen as fuel gas, replacement of air with pure oxygen (oxy–fuel), and electrical heating. The oxidation behavior of steel in these conditions was simulated using a thermogravimetric analyzer (TGA) at high temperatures (up to 1250 °C). Four carbon steel grades, seven different gas atmospheres, and two dynamic heating profiles were included in the test matrix. When compared to the standard reheating practice using natural gas–air, scale formation increased moderately in hydrogen–air and significantly in oxy–fuel gas atmospheres but decreased in the case of simulated electrical heating. With simulated oxy-fuel combustion, no meaningful difference was found between H<sub>2</sub> and a 50:50 CH<sub>4</sub>–H<sub>2</sub> mix in terms of oxidation kinetics. A reduction of the free oxygen content from 2.5 to 1.0 pct was more effective at reducing overall oxidation in the case of CH<sub>4</sub>–air compared to H<sub>2</sub>–oxy–fuel.</p>

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Oxidation of Carbon Steels in Novel Reheating Conditions: Changes to Oxidation Kinetics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月29日

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  • Juho Haapakangas,
  • Susanna Airaksinen,
  • Eetu-Pekka Heikkinen,
  • Timo Fabritius

摘要

The worldwide commitment to large-scale CO2 reductions is forcing steel producers to find improvements to reheating processes for steel slabs. In this study, three practices with potential to lower the carbon footprint of reheating process for steel slabs were studied: use of hydrogen as fuel gas, replacement of air with pure oxygen (oxy–fuel), and electrical heating. The oxidation behavior of steel in these conditions was simulated using a thermogravimetric analyzer (TGA) at high temperatures (up to 1250 °C). Four carbon steel grades, seven different gas atmospheres, and two dynamic heating profiles were included in the test matrix. When compared to the standard reheating practice using natural gas–air, scale formation increased moderately in hydrogen–air and significantly in oxy–fuel gas atmospheres but decreased in the case of simulated electrical heating. With simulated oxy-fuel combustion, no meaningful difference was found between H2 and a 50:50 CH4–H2 mix in terms of oxidation kinetics. A reduction of the free oxygen content from 2.5 to 1.0 pct was more effective at reducing overall oxidation in the case of CH4–air compared to H2–oxy–fuel.