Coiled Steel Bar
Overview
Round steel bars, or wire rods, are long steel products with diameters typically ranging from 5.5 mm to 20 mm, produced through continuous hot-rolling processes. They are fundamental in industries requiring malleable yet strong steel, such as construction and automotive manufacturing. Standardized under GB/T 701 (China) or ASTM A510 (international), these bars are categorized by carbon content and tensile strength. Their coiled form allows efficient transport and handling, making them a cost-effective choice for bulk procurement.
Structure and Working Principle
Round steel bars are manufactured by heating billets to 1,200°C and rolling them into coils through a series of grooved rollers. The hot-rolling process ensures uniformity in diameter and enhances mechanical properties like yield strength (e.g., 235 MPa for Q235 grade). Their circular cross-section distributes stress evenly, making them ideal for bending, cold drawing, or machining into components like bolts, nails, or reinforcement mesh. Surface oxidation (mill scale) is common but removable via pickling for specific applications.
Key Features
Ductility is a standout feature, enabling elongation up to 25% without fracture, crucial for wire drawing. The smooth surface minimizes friction during processing, while consistent diameters (±0.3 mm tolerance) ensure compatibility with automated machinery. Grades like HRB400 add microalloying elements (e.g., vanadium) for higher strength, suitable for seismic-resistant construction. Electrically conductive variants are also available for specialized electrical applications.
Application Areas
Construction: Primary use in reinforced concrete structures (e.g., beams, columns) and prefabricated elements. Manufacturing: Raw material for screws, springs, and welding electrodes via cold heading or drawing. Infrastructure: Used in guardrails, fencing, and suspension bridges due to corrosion resistance when galvanized. Emerging applications include 3D printing wire feedstock and renewable energy infrastructure like wind turbine components.
Maintenance and Precautions
Storage: Keep coils elevated on pallets in dry, ventilated warehouses to avoid rust. Indoor storage is preferred; outdoor stacks require waterproof covers. Handling: Use spreader beams to prevent coil distortion during lifting. Regular inspections for surface cracks or pitting are recommended, especially in humid climates. Anti-rust oils or coatings extend shelf life for long-term storage.
B2B Procurement Guide
Quality Checks: Request third-party inspection reports for sulfur/phosphorus content (should be <0.05% for weldability). Diameter tolerances and ovality tests are critical for precision applications. Logistics: Opt for containerized shipments for small orders (≤20 tons) to reduce damage. Bulk vessel orders (1,000+ tons) benefit from FOB contracts with mill-direct suppliers. Negotiate MOQs (Minimum Order Quantities) based on production capacity—typical MOQs start at 50 tons.
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