How is product quality control conducted for color-coated steel?

What quality inspections are typically required for color-coated steel from the arrival of raw materials to the shipment of finished products? Generally, there are five categories of inspections involving a total of 48 procedures from raw material arrival to finished product shipment. So, what are these five categories and 48 inspection procedures? Let me explain in detail.

The first category refers to inspections of the substrate from the time it enters the factory until it is ready for production: this mainly includes inspections of external quality such as thickness and width, as well as internal quality checks like material properties, coating adhesion, and coating weight.

The second category pertains to inspections of the coatings from their arrival at the factory until they are ready for production: this mainly includes checking for color differences, gloss, and basic performance of the coatings based on sample tests.

The third category involves inspections of the substrate while it is being processed: this mainly includes checks for flatness and surface quality, such as the presence of wavy edges, loose edges, blisters, surface patterns, zinc dross, zinc lines, and any oxidation that could affect usability.

The fourth category consists of inspections of the coating during the application process: this mainly includes checks for color differences, gloss, coating thickness, and uniformity, as well as monitoring for any surface defects that could affect usability, such as scratches, dents, missed spots, or uneven application.

The fifth category is the most critical aspect of quality inspection for color-coated steel, focusing on the performance testing of the products themselves. This primarily includes tests for coating adhesion, hardness, solvent resistance, corrosion resistance, and weathering resistance. Due to the complexity and time required for testing corrosion resistance and weathering resistance, these are generally conducted using sampling methods. Aside from the weathering and corrosion resistance tests, detailed records are maintained for every inspection in all other stages, and quality control personnel document these in the product quality files for future reference.

Powerson Metal Color-Coated Steel strictly adhere to national standards, ensuring that every product undergoes 48 inspection procedures across five categories to guarantee that each product is delivered to customers with zero defects. Welcome to inquiry!