Q: What parameters should be considered when purchasing cold-rolled coils?
A: Core parameters: material grade, thickness (including tolerances), width, length/coil weight, surface grade, applicable standards, mechanical properties, delivery condition (annealed/hardened), and packaging requirements.
Q: What are the delivery conditions for cold-rolled coils?
A: Common conditions:
Annealed (soft): Code M, good plasticity, suitable for stamping;
Hard: Code H, high strength, suitable for structural parts that do not require forming;
Skin Passed: Code S, good sheet shape, smooth surface.
Q: What are the packaging requirements for cold-rolled coils?
A: Standard packaging: inner lining with rust-proof paper/plastic film, outer wrapping with packing straps, corner protectors (to prevent edge damage), and a protective sleeve for the coil core; for sea freight, a moisture-proof film and fumigated wooden pallets are required (for export).
Q: What are the precautions for storing cold-rolled coils? A: ① Store in a dry, well-ventilated warehouse (humidity ≤60%); ② Keep away from acidic, alkaline, and salt spray environments; ③ Store coils vertically to avoid compression and deformation; ④ Regularly inspect packaging and reseal any damaged areas promptly.
Q: What factors affect the price of cold-rolled coils?
A: Core factors: raw material hot-rolled coil price, processing costs (annealing/leveling), grade/precision, specifications (premium for thin/narrow materials), market supply and demand, transportation costs, and coating/surface treatment.