There may be several reasons why pits appear on stainless steel sheets:
Defects during the manufacturing process: During the manufacturing process, if there are material or equipment problems, such as defects on the surface of the raw material, failure of the rolling equipment, etc., it may cause pits on the surface of the plate.
Damage during transportation and handling: During transportation and handling, if the stainless steel plate is hit, squeezed or otherwise subjected to external forces, it may cause pits on the surface of the plate.
Material quality issues: If the stainless steel material used is of poor quality, there may be internal defects or inclusions that may manifest as pits during processing or use.
Environmental corrosion: Under certain environmental conditions, stainless steel may also corrode, especially in environments containing corrosive substances, which may cause pits on the surface.
Improper use: If the stainless steel plate is improperly operated or maintained during use, such as hitting with hard objects, scratching, or improper cleaning, it may cause pits on the surface of the plate.
