It is typically coiled onto spools, wrapped in plastic film or kraft paper, and secured externally with steel strapping to prevent loosening and moisture ingress. Upon customer request, it can be supplied on reels or as straight lengths. Export products must comply with international packaging standards, incorporating desiccants and rust-preventive oil to ensure quality remains unaffected during transit.

Verify compliance with standards for diameter tolerance, ovality, surface finish, and mechanical properties; measure straightness and coil weight; inspect packaging integrity. Conduct metallographic structure and corrosion resistance tests where necessary. High-quality cold-drawn wire exhibits accurate dimensions, defect-free surfaces, and consistent performance.

Common die materials include cemented carbide, diamond, and high-speed steel. Cemented carbide dies offer excellent wear resistance, suitable for mass production; diamond dies provide high precision, ideal for fine-gauge and high-accuracy wires; high-speed steel dies are cost-effective but have lower wear resistance, used for small batches or coarse-gauge production.

Work hardening reduces ductility, necessitating multiple annealing processes that increase costs; surface defects may occur during drawing; rapid tool wear requires regular replacement; production efficiency is low for fine-gauge products; standard cold-drawn wire exhibits poor corrosion resistance, necessitating additional treatment.

High dimensional accuracy, smooth surface finish, high strength, excellent straightness, stable mechanical properties, adjustable strength and ductility to meet requirements, comprehensive product specifications, relatively low cost, and broad applicability. The cold-drawing process also enables small-batch, multi-variety production.

It is extensively used in construction tie wire, welded wire mesh, guardrail mesh, barbed wire, nail manufacturing, fasteners, springs, steel wire ropes, steel brushes, and handicrafts. Cold-drawn wire of varying diameters and materials suits different scenarios, such as fine specifications for components and coarse specifications for structural parts.

Surfaces must be smooth and clean, free from defects such as cracks, folds, or scratches. Minor pickling marks and phosphating films are permissible. Depending on application, galvanising, oil coating, or polishing may be required. Surface quality directly impacts subsequent processing and product longevity.

Key indicators include tensile strength, yield strength, elongation, and hardness. Requirements vary by material and application. For instance, high-carbon cold-drawn wire achieves tensile strengths exceeding 1000 MPa with low elongation, while low-carbon wire offers lower strength but high elongation, facilitating forming operations.

Annealing involves heating cold-drawn wire to a specific temperature, holding it at that temperature, and then cooling it slowly. This process relieves internal stresses, restores plasticity, reduces hardness, and refines the grain structure. Intermediate annealing is performed between multiple drawing passes, while final annealing is determined by product requirements. Temperature and holding time must be precisely controlled according to the material.

During room-temperature drawing, metal grains elongate and flatten, increasing dislocation density. This elevates strength and hardness while reducing plasticity – known as work hardening. Though enhancing wire strength, continued deformation requires annealing to restore plasticity for subsequent drawing stages.

Typically 0.1mm to 12mm, with 0.5mm to 6mm being commonly used. Smaller diameters require more drawing passes, increasing production difficulty. Different precision grades are selected based on application; standard grades allow greater tolerances, while tighter tolerances meet specialised requirements.

Common materials include low-carbon steel (e.g., Q195, Q235), medium-carbon steel (e.g., 45#), high-carbon steel (e.g., 65#, 70#), and stainless steel (e.g., 304, 316). Low-carbon cold-drawn wire offers good plasticity, suitable for binding wire and nail production; high-carbon cold-drawn wire provides high strength, used for springs and steel wire ropes; stainless steel cold-drawn wire offers corrosion resistance, used for decorative applications, etc.

Phosphating forms a porous phosphate film on the wire surface, acting as a lubricant carrier to reduce friction and die wear during drawing while enhancing rust resistance. The phosphating film should be uniform, dense, and of appropriate thickness. Common types include zinc-based and manganese-based phosphating, selected according to product requirements.

Acid pickling removes surface scale from wire rods, preventing damage to dies and wire surfaces during drawing. It also exposes the metal substrate, facilitating subsequent phosphating and lubrication. Common acids used are hydrochloric or sulphuric acid, with concentration, temperature, and duration strictly controlled to avoid over-pickling or under-pickling that could compromise quality. Thorough rinsing and drying follow acid pickling.

Primarily comprises: raw material inspection → acid pickling to remove scale → phosphating to form a lubricating film → saponification lubrication → drawing forming → heat treatment (if required) → surface treatment (galvanising, oil coating, etc.) → coiling and packaging. Drawing may be performed multiple times, with intermediate annealing to relieve work hardening. Parameters must be controlled at each stage to ensure dimensional accuracy and stable mechanical properties.

Cold-drawn wire is formed through room-temperature drawing, offering high dimensional accuracy, a smooth surface, and high strength, though with lower ductility; Hot-rolled wire is produced through high-temperature rolling, featuring surface scale and lower dimensional accuracy, but offering superior toughness and lower cost. Cold-drawn wire suits applications demanding high strength and precision; hot-rolled wire is suitable for general structural purposes. Cold-drawn wire requires surface treatment and lubrication, while hot-rolled wire can be used directly or further processed.

Cold-drawn wire is produced by drawing wire rod (hot-rolled wire) through a die at ambient temperature following surface treatments such as pickling, phosphating, and soaping. The cold-drawing process yields wire with precise dimensions and a smooth surface, while simultaneously inducing work hardening to enhance strength and hardness. Cold-drawn wire finds extensive application in construction tie wire, nail manufacturing, wire mesh, springs, steel wire ropes, and other fields. Depending on application, it can be categorised as standard cold-drawn wire, high-carbon cold-drawn wire, galvanised cold-drawn wire, etc.

Future developments in cold-rolled coils will exhibit the following trends: High-strengthisation: Developing higher-strength cold-rolled products (e.g., Advanced High-Strength Steel, AHSS) to meet automotive lightweighting and safety requirements; Thin-gauge specification: Producing thinner cold-rolled coils (e.g., below 0.1mm) for applications in electronics, new energy sectors, and similar fields; Functionalisation: Imparting special properties (e.g., self-cleaning, high thermal conductivity) through surface treatments and alloy design; greening, employing more environmentally friendly production processes (such as chromium-free passivation and water-based oiling) to reduce energy consumption and pollutant emissions; intelligentisation, applying big data, artificial intelligence and other technologies to optimise production processes, enhance product quality and improve production efficiency; customisation, developing specialised materials and specifications of cold-rolled coils according to specific customer requirements to increase product added value. As manufacturing upgrades, cold-rolled coils will play an increasingly important role in more sectors.