410S surface gold dust / customer complaints, after purchasing a batch of 410S cold-rolled coils into a film-coated flat plate, after tearing off the film, a grainy shiny pattern appeared on the plate surface. After on-site inspection, these granular shiny hair lines can not be removed after manual polishing, and their typical characteristics indicate that the "gold gold" phenomenon easily occurs on the surface of 400 series stainless steel. The main reason for the "gold gold" phenomenon is that the ferrite stainless steel is cooled too quickly during annealing, which leads to sensitization on the surface and intergranular corrosion during pickling. In this way, there are many particles with weak adhesion on the surface of stainless steel. When the adhesive film is torn off, these particles are stuck to the adhesive film. This is because the surface of the stainless steel will show a granular and bright pattern, and particles will also be seen on the adhesive film. Attach. There is also a similar case. When processing the 430/2B products of a steel factory, our company found that the sand surface of the grinding surface was fuzzy and misty when the surface was dry and ugly, but the 2B surface of the batch of stainless steel was normal before processing. The steel plant personnel explained that this is also one of the gold dust phenomena. Due to the raw material quality problem, the company exchanged a batch of good-quality 410S flat plates with customers, and at the same time reflected the situation to the steel mill, claimed from the steel mill, and urged them to pay attention and improve the quality of future products.