Q: What are the common thicknesses, widths, inner diameters, and weights of SPCC coils?
A: Thickness: 0.2-3.2mm (standard); Width: 800-1500mm; Common inner diameters: 508mm/610mm; Coil weight: 3-25 tons (customizable).
Q: What is the difference between surface finishes B (glossy) and D (matte)?
A: B = Smooth from a flat roller, Ra≈0.4-0.8μm, suitable for coating/electroplating; D = Rough roller, Ra≈1.0-1.5μm, less prone to sticking to the die during deep drawing.
Q: What are the thickness tolerance standards for SPCC coils?
A: JIS G3141 specifies: Thickness ≤1.0mm tolerance ±0.05mm; 1.0-2.0mm ±0.07mm; 2.0-3.2mm ±0.09mm (adjusted according to contract/grade).
Q: What are the conversion formulas for roll diameter, weight per meter, and total weight?
A: Weight per meter (kg/m) = Width (m) × Thickness (mm) × 7.85; Roll weight ≈ π × (R² - r²) × Width × 7.85 × 0.001 (R = outer radius, r = inner radius, unit: m).
Q: How to indicate "trimmed edge / rough edge"?
A: Trimmed edge = EC, rough edge = EM; this needs to be specified for export orders as it affects width tolerance and cost.