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Help CenterRibbed Threaded Steel Bar, HRB500, Grade IV Threaded Steel Bar, Suitable for Building Construction and Bending
Product Spotlights
Complete size range 10–32mm straight rebar & coil rebar 6/8/10mm, custom fixed length available
Clear ribbed design, strong bonding force with concrete, anti-slip for construction
Hot rolled process, smooth surface without crack, low tolerance, less construction waste
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1. Product Introduction
Hot Rolled Ribbed Steel Bar (HRB400E / HRB500E seismic rebar) is manufactured by hot rolling high-quality micro-alloyed steel. With crescent-shaped transverse ribs on the surface, it delivers strong bonding force with concrete. As the primary load-bearing material for reinforced concrete structures, it is widely applied in residential buildings, bridges, tunnels, railways, industrial plants and other infrastructure projects. Comply with GB/T 1499.2-2024 national standard, and support certification for overseas engineering exports.
2. Specifications & Technical Parameters
Nominal Diameter
6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 40mm, 50mm
Standard Length
9m, 12m fixed length; customized lengths of 6m/7m/8m available on request
Theoretical Weight Formula
Weight per meter (kg/m) = 0.00617 × d² (d = nominal diameter)
Density
7.85g/cm³
Main Grades
HRB400E: Grade 3 seismic rebar, mainstream product for general construction
HRB500E: Grade 4 high-strength seismic rebar for high-rise & heavy-load projects
HRB335, HRB600E: Available upon demand
3. Chemical Composition
Base material: 20MnSi series, with micro-alloy elements Vanadium, Niobium and Titanium added. Strict control of harmful impurities:C: 0.17%~0.25%Si: 0.40%~0.80%Mn: 1.20%~1.60%S ≤ 0.045%, P ≤ 0.045%Low carbon equivalent guarantees excellent weldability.
4. Mechanical Properties (Seismic Grade E Rebar)
Yield Strength: HRB400E ≥ 400MPa; HRB500E ≥ 500MPa
Tensile Strength: HRB400E ≥ 540MPa; HRB500E ≥ 630MPa
Elongation after fracture (A) ≥ 16%
Total elongation at maximum force (Agt) ≥ 9.0%
Seismic requirements: Tensile-yield strength ratio ≥ 1.25; Actual yield strength ratio ≤ 1.30
Cold bending performance: No cracks after 180° bending, suitable for on-site bending processing
5. Core Advantages
Excellent Seismic ResistanceSpecial E-grade seismic steel avoids brittle fracture under seismic loads, meeting construction codes of high-seismic-risk regions worldwide.
Superior Concrete BondingUniform crescent ribs greatly enhance anchoring force with concrete to prevent sliding, ensuring structural stability.
Flexible Processing CompatibilitySupports cutting, bending, threading, electric slag pressure welding, lap welding and straight thread mechanical connection, compatible with all construction techniques.
High Strength & Material SavingHRB500 high-strength rebar reduces steel consumption under identical load conditions to lower overall project cost.
Stable Material QualityOriginal hot rolled from steel mills with uniform metallographic structure; no lamination, cracks or peeling defects. Mill Test Certificate (MTC) provided for each batch.
Stable SupplyAmple stock for full truckload and container export. Certificates like FORM E, CO, CE can be supplied for customs clearance.
6. Application Scope
Civil Construction: High-rise apartments, office buildings, shopping malls, basements, pile caps, beams, slabs
Infrastructure: Highways, bridges, tunnels, subways, high-speed railway stations, dams
Industrial Projects: Large factories, logistics warehouses, heavy-duty equipment foundations, power plants, docks
Overseas Projects: Residential and infrastructure works in Southeast Asia, Middle East, Africa, South America
7. Packing & Delivery
Packing: Bundled with steel strips. Each bundle marked with steel mill logo, grade, size, weight and heat number. Waterproof woven cloth wrapping optional for sea transportation to prevent rust.
Trade Terms: Domestic FOB mill/warehouse; Export FOB port, CFR & CIF destination port acceptable.
Quality Guarantee: Original mill test certificate attached with goods. Third-party inspection (SGS, BV) available on site.
8. Storage & Notes
Store in dry and ventilated warehouse, avoid long-term exposure to rain and moisture to prevent surface rust.
Stack separately by specification and grade to avoid mixing.
Cover with concrete protective layer during construction to prevent corrosion.
Avoid long-time exposure to high temperature, as high heat will sharply reduce bearing capacity.
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