Oxide scale intrusion/The customer is purchasing a 4.5*1520mm*C hot-rolled NO.1 steel coil of a certain steel plant, and found that there is iron scale intrusion on the surface of the fixed-length Kaiping processing sand. With the continuous expansion of stainless steel in industrial and civil applications, stainless steel hot-rolled NO.1 steel coils are directly used as products on the surface of substrates, which are widely used in decorative decoration, loading and unloading vehicles, storage tank equipment, etc. Customers require not only excellent physical properties and geometric dimensions for stainless steel products, but also high requirements on the surface. 1 From the definition and morphological analysis of hot-rolled scale: there is a certain continuous strip shape, loose needle shape, loose sand shape or sheet-shaped scale on the surface of the steel strip in the rolling direction. Different stainless steel types can be used occur. Main reasons: The high-pressure descaling effect is not ideal, and the primary scale is not removed by descaling. During the process, the rolling temperature is too high, and the secondary scale is pressed into the surface of the strip during rolling. Seen from the surface of the substrate surface of the fixed-length Kaiping frosted substrate: there is a sheet-like scale pressed in the rolling direction on the surface of the strip. A matte surface without scale pressed. This case of quality objection tells us: For mature iron and steel enterprises, the difference in core competitiveness is not equipment and production capacity, but the company's internal management capabilities. The market is the only standard for inspecting product quality. After a friendly business relationship with the customer, a one-time compensation treatment is given. It is recommended that the customer sell according to the needs of different user groups for the surface.