Overview
Round steel rebar is a hot-rolled carbon steel product primarily used to reinforce concrete in construction projects. It is manufactured in coiled or straight lengths, with surface patterns (e.g., ribs) to enhance bonding with concrete. Standard diameters range from 6mm to 50mm, with grades such as HRB335, HRB400, and HRB500 indicating yield strength (in MPa). Its circular cross-section distinguishes it from deformed bars, though both serve similar structural purposes.
Structure and Working Principle
Round rebar’s strength comes from its microstructure, achieved through controlled rolling and cooling processes. The steel’s carbon content (0.1%-0.3%) balances ductility and hardness. When embedded in concrete, it absorbs tensile stresses, preventing cracks and structural failure. Smooth surfaces are common for smaller diameters, while larger bars may have ribs for improved adhesion. Coiled variants (盘圆) are easier to transport and cut on-site.
Key Features
High tensile strength (400-600 MPa) ensures durability under load. Ductility allows bending without fracturing, crucial for seismic-resistant designs. Galvanized or epoxy-coated options resist corrosion in harsh environments. Consistent dimensions and material properties are verified through mill certifications. Lightweight coils (1-3 tons) optimize logistics for large-scale projects.
Application Areas
Widely used in residential/commercial buildings, bridges, and highways for foundations, columns, and slabs. Machined parts (e.g., bolts, shafts) utilize precision-cut round steel. In prefabrication, coiled rebar reduces waste by enabling custom lengths. Offshore platforms and nuclear facilities may require specialized alloys for extreme conditions.
Maintenance and Precautions
Store coils on pallets under cover to avoid moisture. Surface rust can be removed with wire brushing; severe corrosion compromises strength. Use gloves and eye protection during handling. Bending should follow minimum radius standards to prevent microcracks. Inspect for mill scale or contaminants before concrete pouring.
B2B Procurement Guide
Source from ISO-certified mills with traceable material records. Compare prices per ton, including cutting/straightening fees. Request samples to check diameter tolerance (±0.3mm) and surface quality. Bulk orders (20+ tons) often qualify for discounts. Lead times vary by production schedule and shipping distance—plan for 2-4 weeks internationally.
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