Abstract
Various processing parameters leading to edge cracking in hot-rolled coils are described, along with a study of the effect of these parameters on the occurrence of edge cracking during commercial production of semi-killed hot-rolled coils. High-temperature tensile testing revealed that ductility decreased with a decrease in test temperature from 850 to 750 °C and improved with a further drop in temperature. This phenomenon is attributed to the closed-packed structure of single-phase austenite at higher temperatures, which transforms to ferrite + austenite at the intermediate temperature range. Edge cracking was frequently observed in hot-rolled coils that were finish rolled within this intermediate temperature range. Optical microscopy revealed large ferrite grains near edges of the coil as well as at inner surfaces of cracks caused by decarburization at higher temperatures. A minimum manganese/sulfur ratio of 12 to 8 for a sulfur level of 0.03 to 0.04%, proper teeming practice, adequate soaking, and a finish rolling temperature above 875 °C resulted in overall improvement in the edge quality of hot-rolled coils.
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