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Tolerance of Purification Color-Coated Steel Coil
The positive and negative tolerance (allowable dimensional deviation) of purification color-coated steel coils is typically determined by product standards, customer requirements, and specific application scenarios. Below are common tolerance ranges and related considerations:
1. Thickness Tolerance
Base Material Thickness: The thickness tolerance of the substrate (galvanized, galvalume, etc.) generally follows international or national standards (e.g., GB/T, ASTM, JIS).
Cold-Rolled Substrate: ±0.03mm ~ ±0.05mm (e.g., a 0.5mm-thick coil may range from 0.47–0.53mm).
Hot-Dip Galvanized Substrate: ±0.05mm ~ ±0.08mm (due to coating process variations).
Total Thickness After Coating: The additional thickness from the color coating is usually ±0.02mm ~ ±0.03mm and should be combined with the substrate tolerance.
2. Width Tolerance
Standard Width: Common width tolerance is ±2mm ~ ±5mm (e.g., a 1000mm-wide coil may range from 995–1005mm).
Slit Narrow Strips: For slit coils (used in purification panels), tolerance may be stricter, controlled within ±1mm.
3. Length Tolerance (Cut-to-Size Sheets)
If the coil is processed into fixed-length sheets (e.g., for purification panels), the length tolerance is typically ±3mm ~ ±10mm, depending on equipment precision and customer requirements.
4. Other Key Parameter Tolerances
Coating Weight: Tolerance for zinc or paint coating weight is usually ±10%–15% (e.g., a 20μm zinc coating may allow ±2μm deviation).
Color & Gloss: Color difference (e.g., ΔE ≤ 1.5) and gloss deviation (e.g., ±5GU) should be confirmed with the customer.
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