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<p>The required mechanical and physical properties of 05G2MB low-carbon, low-alloy steel sheets in strength classes K60–K65 are achieved by forming dispersed ferrite-bainite structures. These sheets are intended for producing large-diameter electric-welded pipes and are processed using thermomechanical controlled processing (TMCP). Accurately quantifying the thermal effects of austenite decomposition greatly improves the precision with which the microstructural state of steel can be predicted, which is crucial for modeling and controlling the TMCP process. This study collected experimental data on temperature versus time profiles of thermally uniform samples subjected to different cooling intensities. Cooling intensity was characterized by the derivative of the specific heat flow power with respect to metal temperature (<i>dW/dT</i>), ranging from 10&#xa0;to 520 W/(kg·°C). The specific thermal effects of austenite decomposition were found to be 75.2–93.3 kJ/kg for ferrite formation, 107.7–126.0 kJ/kg for upper bainite formation, and 84.2–95.4 kJ/kg for lower bainite formation.</p>

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Thermal effects during the ferritic and bainitic decomposition of austenite in 05G2MB steel

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • N. V. Urtsev

摘要

The required mechanical and physical properties of 05G2MB low-carbon, low-alloy steel sheets in strength classes K60–K65 are achieved by forming dispersed ferrite-bainite structures. These sheets are intended for producing large-diameter electric-welded pipes and are processed using thermomechanical controlled processing (TMCP). Accurately quantifying the thermal effects of austenite decomposition greatly improves the precision with which the microstructural state of steel can be predicted, which is crucial for modeling and controlling the TMCP process. This study collected experimental data on temperature versus time profiles of thermally uniform samples subjected to different cooling intensities. Cooling intensity was characterized by the derivative of the specific heat flow power with respect to metal temperature (dW/dT), ranging from 10 to 520 W/(kg·°C). The specific thermal effects of austenite decomposition were found to be 75.2–93.3 kJ/kg for ferrite formation, 107.7–126.0 kJ/kg for upper bainite formation, and 84.2–95.4 kJ/kg for lower bainite formation.