Effect of rolling temperature on iron oxide scale of SPHC hot rolled pickled plate
For the pitting defects on the surface of SPHC hot-rolled strip steel,the oxidation behavior of SPHC hot-rolled strip steel in dry air was studied at the actual temperature range of the second rough rolling roll and the actual finishing rolling temperature range ( 830～1080℃) . The blistering phenomenon on the surface of the oxide scale,the thickness and structure of the oxide scale cross-section were analyzed using a microscope,and the variation of the oxide scale thickness with the oxidation temperature was predicted. The results show that when the oxidation temperature is 830～1080℃,the oxidation process of SPHC hot-rolled strip steel follows a parabolic law,and the thickness of the oxide scale increases with the increase of oxidation temperature;when the oxidation temperature is 830～930℃,the proportion of Fe3O4 layer increases with the increase of oxidation temperature. When the oxidation temperature is 930～1030 ℃,the proportion of Fe3O4 is greater than that of FeO,and the oxide scale exhibits blistering phenomenon;when the oxidation temperature is 1011 ℃,the thickening rate of the oxide scale reaches its maximum. At this oxidation temperature,the deformation of the oxide scale is the worst,and the strip steel is prone to producing pitting defects;properly increasing the amount of descaling water after rough rolling,reducing the starting temperature of finishing rolling,and paying attention to the surface quality of the initial pass rolling rolls can effectively avoid pitting defects on the surface of SPHC hot-rolled strip steel.
hot rolled steel stripoxide scalehigh temperature oxidationoxidation kineticsrolling temperature
万方数据
维普
