after acid continuous rolling of strip steel in 70 ~ 80 ℃ before annealing, concentration of 3% 5% of the lye.Remove the residual rolling oil and other dirt on the surface of strip steel to prevent it from being brought into the furnace to destroy the protective atmosphere components in the furnaceSound decarbonization efficiency. Oil pollution causes the surface quality of strip steel to deteriorate, affects the coating quality, and causes the nodule on the bottom roll of furnace.Surface defects such as scratches on the surface of strip steel. The strip is washed with hot water and blown dry after alkaline washing. Strip surface cleaning quality andThe alkali liquid temperature, concentration and running speed of strip steel are related. Check strip steel surface cleaning effect can be cleanWhite toilet paper is wiped on the steel plate after the hot air dryer. If there are black marks on the white paper, it indicates that alkaline cleaning cannot be doneClean, need to adjust the process parameters.