Study on the Cause of Surface Color Difference of Pickling Automobile Structural Steel and Process Optimization
According to the strip color difference defect on the surface of pickling automotive structural steel SAPH370,the structure of the oxide sheet of defective hot-rolled substrate and the micro-morphology after pickling were analyzed by optical microscope and scanning electron microscope,and it was found that the difference of strip surface roughness was the direct cause of the surface color difference.Combined with the surface state of the hot roll,it can be seen that the main reason for the strip color difference on the lower surface of the finishing roll is that the oxidation film on the lower roll is more serious than that on the upper roll,and the difference in the state of the roll is inherited to the hot rolled substrate,resulting in the difference in surface roughness after pickling.The defects of color difference can be effectively eliminated by optimizing the rolling temperature,roll change period and rolling lubrication technology.
pickling plate SAPH370color differenceiron oxidehot rolling processroll state
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