Manufacturing Process

The mirror-finish stainless steel core undergoes surface polishing treatment. It is made from high-quality stainless steel substrate and is formed through multiple precise processes of grinding. The core process is as follows:

1. Base material pre-treatment: Select stainless steel base material without defects. Through annealing and acid washing, remove the surface oxide scale, oil stains and impurities to ensure the base material is clean and flat.
2. Rough Polishing: Use grinding wheels and abrasive belts to polish, eliminating unevenness and rolling marks on the surface, and preliminarily shaping the surface.
3. Step-by-step fine polishing: Follow the sequence of coarse sand → medium sand → fine sand, using the corresponding polishing wheels and polishing paste to refine the roughness. Clean the surface after each process to avoid the residue of abrasive materials.
4. Mirror polishing: Using ultra-fine polishing paste combined with a wool wheel for high-speed polishing, the surface roughness is reduced to Ra ≤ 0.01 μm, resulting in a clear mirror surface. For high-grade 10K and 12K, the polishing precision needs to be increased.
5. Post-processing: After cleaning to remove residues, performing passivation to enhance corrosion resistance, and applying a coating to prevent scratches, the final product is completed.

Dimensional Range & Tolerances

- Sheet material: Thickness ranging from 0.3mm to 10mm. Standard sizes are 1220mm × 2440mm and 1500mm × 3000mm. Custom non-standard sizes are also available. Project

Tolerance requirements (refer to national standard GB/T 3280)
Thickness tolerance
Thin plates (≤ 1mm): ±0.02mm to ±0.05mm; Thick plates (> 1mm): ±0.05mm to ±0.1mm
Flatness tolerance
≤1mm/m (high precision requirement)
Surface roughness
Mirror-level: Ra ≤ 0.01 μm; 8K standard: Ra ≤ 0.02 μm
Dimensional deviation
Length/Width Deviation: ±1mm to ±3mm (Customizable with high precision of ±0.5mm)

Mechanical properties