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Increasing the Service Life of Large Rolling-Mill Rolls by Using the Reserve Hardenability of the Steel

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Metallurgist Aims and scope

Roll steel with a high chromium content (steel 45Kh5MF) is characterized by good hardenability, which provides an opportunity to significantly increase the durability of rolling-mill rolls. Here, the surface layer (working layer) of the rolls is strengthened thanks to the use of a heat treatment that forms a structure of lower bainite while blocking the pearlite transformation of austenite. At the same time, occurrence of the bainite transformation in high-chromium steel requires that the steel be kept in the narrow temperature range associated with this conversion (290–410°C) for a considerable length of time. Large rolls made of steel 45Kh5MF are quenched on a horizontal unit in two stages: intensive water-air cooling for 30–35 min (stage 1); cooling with compressed air for 4–5 h (Stage 2). Such quenching blocks the conversion of austenite to pearlite and ensures the formation of a satisfactorily developed bainitic structure. Efficient regimes for quenching and tempering large rolling-mill rolls were found by using integrated software that makes it possible to track the dynamics of the formation of temporary and residual stresses in rolls.

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  1. Research Institute of Metallurgical Heat Engineering (VNIIMT), Ekaterinburg, Russia

    Yu. A. Samoilovich

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  1. Yu. A. Samoilovich
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Correspondence to Yu. A. Samoilovich.

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Translated from Metallurg, No. 7, pp. 44–50, July, 2015.

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Samoilovich, Y.A. Increasing the Service Life of Large Rolling-Mill Rolls by Using the Reserve Hardenability of the Steel. Metallurgist 59, 604–612 (2015). https://doi.org/10.1007/s11015-015-0146-x

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  • DOI: https://doi.org/10.1007/s11015-015-0146-x

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