Causes and solutions of surface warping of Q355C strip steel
In the process of producing Q355C hot rolled strip steel, it was found that the surface of strip steel frequently appeared warping defects. To this end, the metallographic and gas inspection for the strip steel with the warping defects are carried out，and the hot acid corrosion inspection and crack analysis for the continuous casting slab of reheating treatment are carried out. This paper analyzes the causes of strip steel production warping from the aspects of steelmaking process, refining process, continuous casting pro⁃cess, hot rolling process and continuous casting slab temperature of coming into the heating furnace，the re⁃sults show that the occurrence of Q355C hot rolled strip steel warping is related to the high nitrogen ele⁃ment content in the steel and the low continuous casting slab temperature of coming into the heating fur⁃nace. Through optimizing the charging system of the converter, adjusting converter bottom blowing mode, increasing carbon element content and temperature at the finishing point of converter, optimizing LF sub⁃merged arc smelting effect, argon blowing protection casting of ladle long nozzle and increasing continuous casting slab temperature into the heating furnace, the warping defects of strip steel are basically eliminated.
hot rolled strip steelwarping defectsconverter bottom blowingsubmerged arc smeltingprotective casting
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