Blistering of scale occurs during hot rolling process because high pressure gas forms at the interface between steel base and oxide,and the scale would be rolled into steel base in the followed hot rolling process,resulting in pitting scale or typical rolled-in scale defect.The blistering behavior of scale of super low carbon steel,super low carbon steel containing P,low carbon steel,middle carbon steel during heating process was investigated through thermo-gravimetric experiment and SEM analysis,especially focusing on the effects of P and C on blistering behavior of scale.The results show that reaction product of P element around 980 ℃ at the interface is Fe3 (PO4)2 which will melt and vaporize under high temperature to result in blistering of scale.Severe gas hole and crack can be found in scales of samples above 1050 ℃ because of formation of CO or CO2 as a result of high reaction activity of C element and the enrichment of C element at the interface.
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万方数据
维普
