HOW TO CLEAN STAIN STEEL FLANGE?

The flange is a part of the shaft and the shaft that is connected to each other and is mainly used for the connection between the pipe ends. It is also used on the import and export of equipment and the connection between the two equipments. There are many kinds of flanges, such as blind flange, slip on flange, socket weld flange, threaded flange, plate flange, long weld neck flange, lap joint flange. Because the flange has good comprehensive performance, it is widely used in chemical engineering, construction, light and heavy industry, aerospace, shipbuilding and other basic projects.

304 stainless steel is the most commonly used for manufacturing flanges.  So how to clean the residual stains on the flange correctly and quickly? At 20℃, the flange made of this material will be corroded in 10% nitric acid at a rate of less than 0.1 mm per year. It will be corroded in 10% boiling acetic acid at a rate of less than 0.1 mm per year. It will be corroded in 50% citric acid at a rate of less than 0.1 mm per year. And it will be corroded in 20% potassium hydroxide at a rate of less than 0.1 mm per year. At 60℃, the flange made of this material will be corroded in 80% phosphoric acid at a rate of less than 0.1 mm per year. At 50℃, the flange made of this material will be corroded in 2% sulfuric acid at a rate of 0.016 mm per year.

Therefore, the stainless steel pipe welded with cold-rolled stainless steel strip with stainless steel welded pipe fittings and stainless steel flange can be used to transport weakly acidic or weakly alkaline chemical fluids. Stainless steel flanges are often produced in dusty areas. And those dust which can be removed with water or an alkaline solution continually land on the surface of the equipment. However, for adhering dust, high pressure water or steam is required for cleaning. However, high-pressure water or steam is needed to clean up the adhering dust. If there is the problem of floating iron powder or embedded iron on the surface, because the free iron will rust and corrode the stainless steel flange, it must be cleared. Floating powder can generally be removed with dust. Some adhesion is very strong and must be treated as embedded iron. In addition to dust, there are many sources of surface iron. The iron on the table surface can easily embed the surface if the stainless steel flange is not protected during the blanking process. Stainless steel flange rust removal method is  that the flange is immersed in hydrochloric acid. The principle is to reduce the rust into iron, but this method has certain danger. Due to hydrochloric acid is a corrosive substance and harmful to the human body, it must be paid attention to do not touch it during operation. The finished flange needs alkali neutralization, do not directly touch it by hands.

The above is the cleaning method of residual stains on stainless steel flanges. The stainless steel is fragile and requires good cleaning and maintenance.