How is the length of Q235 steel coil calculated?
A: Theoretical length (m) = Coil weight (kg) ÷ (Thickness (mm) × Width (mm) × 7.85 × 10^-3). Actual length may vary slightly due to coil diameter and spacing.
Are there fixed requirements for the inner and outer diameters of Q235 steel coils?
A: The inner diameter is the industry standard **508mm (20 inches)** or 610mm (24 inches). Customization is not available without special requirements. The outer diameter has no fixed value and varies depending on the weight and thickness of the single coil, generally 1000-2000mm.
What are the customizable special specifications for Q235 steel coils?
A: We can customize extra-wide (1800-2200mm), extra-thin (hot-rolled ≤1.5mm / cold-rolled ≤0.2mm), and extra-heavy coils (over 30 tons). We can also slit into narrow strip coils (width ≥50mm) upon request.
What are the key mechanical properties of Q235 steel coils? A: Yield strength ≥ 235 MPa, tensile strength 375-500 MPa, elongation after fracture ≥ 25% (thickness ≤ 16 mm), no cracks after 180° cold bending test (bending mandrel diameter = thickness).
Does thickness affect the yield strength of Q235 steel coils?
A: Yes, when thickness > 16 mm and ≤ 40 mm, yield strength ≥ 225 MPa; when thickness > 40 mm and ≤ 60 mm, ≥ 215 MPa; when thickness > 60 mm, it follows the agreement, with a slight decrease in strength as thickness increases.