1.What is surface No.1? What are its typical characteristics?
After cold rolling, it undergoes heat treatment and pickling, resulting in a matte silver-white surface.
Deep-drawn parts such as industrial tanks and pipes that do not have high surface requirements.
2.What is surface No.2D? What are its characteristics?
Based on No.1, the surface is lightly cold-smoothed by a textured roller, resulting in a lower surface gloss.
Automotive structural components, water pipes, etc.
3.What is the surface type of No. 2B? What processing method is used?
Based on No.1, it is finally smoothed by polishing rollers to obtain a smoother and shinier surface than No.2D.
It has the widest range of applications, such as tableware, building materials, and appliance casings.
4.What is a BA (bright annealed) surface? What are its characteristics?
Bright annealing is performed in a controlled atmosphere to obtain a highly reflective surface, similar to a mirror.
Applications requiring high gloss, such as appliance panels, decorative materials, and kitchen equipment.
5.How are surfaces classified according to their quality grades?
FA: Standard grade. Defects that do not affect molding or coating adhesion are permissible, such as small bubbles, minor scratches, and slight oxidation. This is the most basic requirement.
FB: Higher grade (roughly equivalent to the old Grade II). Stricter defect restrictions. The better side must not have defects that affect the uniformity of the high-quality paint or plating appearance. The other side must at least reach Grade FA.
FC: High-grade (roughly equivalent to the old Grade I). The most stringent defect restrictions. The better side must have virtually no defects affecting appearance, and the other side must at least reach Grade FB.
FD: Ultra-high grade. Building upon FC, it places even higher demands on surface cleanliness (e.g., residual carbon, oil spots) and microscopic uniformity (e.g., no bright spots after polishing).