Lubricant residue and its removal in packaging steel strip rolling

Lubricant residue and its removal in packaging steel strip rolling
　　 Although the rolling lubricating fluid residue is useful in making the rolled strip steel have a certain degree of corrosion resistance, it must be completely removed before or during the further processing of the strip. Generally speaking, strip cleaning can be done by one of the following methods:
　　1) Use detergent on the last stand of the tandem cold rolling mill;
　　2) Strip steel is either offline or in tandem with another processing line such as a continuous annealing line for online electrolytic cleaning;
　　3) Off-line evaporative degreasing or chemical cleaning of strip steel;
　　4) Burn off the lubricant residue in the box annealing furnace.
　　 There are many patented cleaning agents for rolling mills available on the market, and they are usually used in the form of aqueous solutions. The designed collection and nozzle can make cleaning agent wash the strip and roll at high pressure. After burying in this way, the residue of rolling lubricating fluid (oil) on the surface of the steel strip is greatly reduced.
　　 is a typical electrolytic cleaning line used for tin plate. It uses alkaline Nagisa lotion, such as sodium hydroxide, sodium silicate and sodium phosphate, but sodium metasilicate and sodium sesquisilicate are also often used to clean racks of some types of products. Although electrolytic cleaning has not been widely used, it can be confirmed that this method has many advantages, and the total power consumption is 8-10 watts·hour (kWh)·ton. Although the actual operating conditions of these cleaning lines have changed a lot, the strip steel system is usually used as the cathode, and the current density is 5.6-7.0 A/m2 (60-75 A/ft'). The strip is coming out of the electrolytic cell. Later, in some cases, it is immersed in a short rinsing broadcast, and then through the spray meter cleaning and rotating brush to remove the final traces of alkali and pickling residues, and then immersed in the hot water washing tank and hot air dryer to make the strip reach The pinch roll and coiler are pre-dried quickly.