Most stainless steel products require good corrosion resistance, such as Class I and II tableware, kitchen utensils, water heaters, water dispensers, etc. Some foreign merchants also conduct corrosion resistance tests on the products: use NACL aqueous solution to heat it to boiling, and then pour it after a period of time. Remove the solution, wash and dry, and weigh the weight loss to determine the degree of corrosion (note: when the product is polished, the abrasive cloth or sandpaper contains Fe components, which will cause rust spots on the surface during the test)
In today's society, stainless steel products generally go through the process of polishing during production, and only a few products such as water heaters and water dispenser inner tanks do not need to be polished. Therefore, this requires good polishing performance of the raw material. The main factors affecting polishing performance are as follows:
① Surface defects of raw materials. Such as scratches, pitting, pickling, etc.
②Material problems of raw materials. If the hardness is too low, it is not easy to polish during polishing (BQ is not good), and if the hardness is too low, orange peel will easily appear on the surface during deep drawing, which will affect the BQ. BQ with high hardness is relatively good.
③After deep drawing, small black spots and RIDGING will appear on the surface of the area where the deformation is extremely large, which will affect the BQ performance.