Overview
Galvanized annealed wire is a processed steel wire combining zinc coating for corrosion protection and annealing for enhanced flexibility. The annealing process involves heating and slow cooling, which relieves internal stresses, making the wire softer and easier to handle. It is widely used in industries requiring both durability and pliability. Available in diameters ranging from 0.5 mm to 4 mm, it is classified by zinc coating type (electro-galvanized or hot-dipped) and tensile strength. Electro-galvanized wire is suitable for indoor use, while hot-dipped variants excel in outdoor environments due to thicker zinc layers.
Structure and Working Principle
The wire consists of a low-carbon steel core (typically 0.05%-0.25% carbon) uniformly coated with zinc via electrolysis or hot-dipping. Annealing alters the steel's crystalline structure, reducing hardness while improving elongation properties (up to 15-25%). During manufacturing, cold-drawn steel wire undergoes annealing at 600-700°C, followed by zinc application. The zinc layer acts as a sacrificial anode, protecting the steel from rust even if scratched. This dual-process ensures a balance between tensile strength (350-550 N/mm²) and workability.
Key Features
1. **Corrosion Resistance**: Zinc coating provides 5-20 years of protection, depending on environmental conditions. Hot-dipped wires offer superior longevity. 2. **Ductility**: Annealing allows for tight bending without fracture, ideal for intricate shapes. 3. **Uniformity**: Precision drawing ensures consistent diameter (±0.02 mm tolerance). Additional advantages include excellent conductivity (useful for earthing applications) and weldability. The smooth surface minimizes friction during processing, reducing tool wear in automated setups.
Application Areas
**Construction**: Reinforcing concrete structures, gabion boxes for erosion control. **Agriculture**: Vineyard trellising, livestock fencing (Class 3 galvanization preferred). **Industrial**: Mesh for filters, conveyor belts, and packaging straps. Craft industries utilize thinner gauges (0.5-1.2 mm) for jewelry and wire art. Its non-toxic zinc coating makes it safe for food-grade applications like poultry cages. In B2B procurement, bulk orders often specify ASTM A641 or ISO 7989-2 standards.
Maintenance and Precautions
Store coils on pallets in ventilated, low-humidity warehouses to prevent white rust (zinc hydroxide formation). For extended outdoor exposure, apply additional anti-corrosion treatments like powder coating. Avoid dragging wire over abrasive surfaces to prevent zinc layer damage. Use gloves during handling to minimize oil contamination, which can reduce coating adhesion. Regular inspections for coating integrity are recommended in high-salinity environments.
B2B Procurement Guide
1. **Certification**: Require mill test certificates for zinc coating weight and tensile tests. 2. **MOQs**: Standard orders start at 5 tons; negotiate discounts for 20+ ton shipments. 3. **Logistics**: Opt for waterproof wrapping during transit. Container loading typically fits 20-25 tons per 40HQ. Leading manufacturers include Hebei Yicheng Wire Mesh and Tianjin Metallurgy. For reference, 2 mm hot-dipped wire (60 g/m² coating) trades at approximately $800/ton FOB China ports. Sample testing for salt spray resistance (e.g., 72+ hours per ASTM B117) is advisable.
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