Overview
Galvanized square wire is a cold-drawn steel wire with a square cross-section, coated with zinc through hot-dip or electro-galvanizing processes. The zinc coating provides superior corrosion protection, making it suitable for outdoor and high-moisture environments. The square profile offers advantages over round wire in applications requiring flat contact surfaces or anti-rotation properties. Common sizes range from 2mm to 10mm in width, with tolerances typically within ±0.1mm for precision industrial uses.
Structure and Working Principle
The product consists of a core steel wire (usually SWRM class) shaped into a perfect square through cold-rolling, followed by zinc coating application. Hot-dip galvanizing (HDG) provides 50-100μm zinc layers, while electro-galvanizing offers thinner but more uniform coatings. The square geometry enhances bending stiffness by approximately 15% compared to round wire of equivalent cross-sectional area. The zinc coating creates a sacrificial barrier that corrodes before the underlying steel, with protection duration proportional to coating thickness.
Key Features
1) Enhanced corrosion resistance: Zinc coating provides 5-30 years protection depending on environment (marine, industrial, or rural). 2) Structural advantages: Flat surfaces enable better joint contact in welded assemblies. 3) Aesthetic appeal: Bright zinc finish requires no additional painting for many applications. Mechanical properties typically include tensile strength of 350-550 N/mm² and elongation of 10-20%. The square edges allow for positive location in jigs and fixtures during automated manufacturing processes.
Application Areas
Construction: Reinforcement for prefabricated concrete elements, especially where flat surfaces are needed for formwork contact. Fencing: Used in perimeter security systems where the square profile prevents climbing. Industrial: Manufacture of springs requiring flat contact surfaces, conveyor system components, and agricultural equipment. The wire is also popular in artistic metalwork due to its clean lines and ease of welding.
Maintenance and Precautions
Periodic inspection for white rust (zinc oxide) formation is recommended in coastal areas. Mild surface corrosion can be removed with a wire brush and treated with zinc-rich paint. Avoid contact with copper or brass components to prevent galvanic corrosion. Storage should be in dry conditions with pallets placed on raised platforms to prevent ground moisture absorption. For critical applications, specify Class 3 zinc coating (minimum 85μm) per ASTM A123 standards.
B2B Procurement Guide
Key specifications to verify: 1) Zinc coating method (HDG preferred for outdoor use) 2) Coating weight (G90 standard for 610g/m²) 3) Dimensional tolerances (±0.05mm for precision uses) 4) Straightness (≤2mm deviation over 1m length). Bulk orders typically require 15-30 day lead time. MOQs range from 1-5 tons depending on manufacturer. Consider requesting salt spray test reports (typically 500-1000 hours to first red rust) for quality verification.
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