Abstract
Fatigue behaviour of high chromium steel (HCS) for rolls is presented. Rolls are double layered and they are predicted to be used at roughing stands in hot strip mills. Shells of rolls are made of high chromium steel and for cores a combination of pherlitic – ferritic nodular graphite iron is used. Due to compression loading of rolls, where slabs are reduced to the long stripes, special specimens have been used and tested under compression loading conditions. The tested specimens are manufactured under similar conditions (cooling after centrifugal casting, heat treatment, and rough and fine grinding) as real rolls. The residual stresses as a consequence of mechanical and thermal treatment of rolls (specimens) are considered during experimental determination of treated material parameters and are not taken into account in the subsequent calculation procedures. The tests specimens have been loaded with pure pulsating compression load (load ratio R=0 in compression) at different load levels. Therefore, a typical S-N curve and appropriate fatigue parameters (fatigue strength coefficient σf’ and fatigue strength exponent b) are determined. The experimental results determined in this study can serve as a basis for the further determination of service life of rolls using stress-life approach.
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