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Help CenterSteel Rebar & Hot Rolled Ribbed Bars，HRB400、HRB500、HRB600、HRB400E、HRB500E、HRB600E、HRBF400E、HRBF500E
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1. Product Overview
Hot Rolled Ribbed Steel Bar, commonly known as rebar, complies with national mandatory standard GB 1499.2-2024 Steel for the Reinforcement of Concrete – Part 2: Hot Rolled Ribbed Bars. It is special load-bearing steel exclusively for reinforced concrete structures.
The bar body is cylindrical with two longitudinal ribs and evenly distributed crescent transverse ribs. The concave-convex rib structure greatly improves bonding and anchoring force with concrete to prevent sliding under load. Manufactured via micro-alloy controlled rolling and cooling technology, it integrates high strength, excellent ductility, stable weldability and energy dissipation capacity for seismic resistance. It acts as the core load-bearing skeleton material for residential buildings, bridges, tunnels, water conservancy and municipal infrastructure, and mandatory sampling inspection is required for all key construction projects.
Anchoring & Load-Bearing Principle
After concrete hardening, transverse ribs embed into concrete to form mechanical interlock, transferring external load from concrete to steel bar and avoiding interface peeling and sliding. Seismic-grade rebar features low yield-to-tensile ratio and high elongation, which absorbs deformation energy under seismic load to prevent brittle collapse of buildings and guarantee structural safety in earthquake zones.
2. Grade Classification, Definition & Application Scenarios
Grade Code Explanation
HRB = Hot rolled Ribbed Bars; Suffix number = Minimum yield strength (MPa); E = Earthquake-resistant; F = Fine grain
Standard Hot Rolled RebarHRB400, HRB500, HRB600
HRB400: Mainstream general grade for residential buildings, factories and ordinary municipal road beams, slabs and columns
HRB500: High-strength lightweight grade for high-rise buildings, long-span bridges and large water conservancy hubs
HRB600: Ultra-high strength grade for heavy-load infrastructure and prestressed matching components
Seismic Hot Rolled Rebar (Mainstream for Construction Projects)HRB400E, HRB500E, HRB600EComply with three mandatory seismic indexes: yield-to-tensile ratio ≥1.25, measured yield / standard yield ≤1.30, total elongation Agt ≥9%. Mandatory for buildings in seismic zones, schools, hospitals, metro and bridges.
Fine Grain Seismic RebarHRBF400E, HRBF500EVanadium-nitrogen microalloy refines grain structure with superior low-temperature toughness, suitable for cold northern regions, offshore wind power and coastal corrosive projects.
Equivalent International Export Grades
ASTM A615 Gr40/Gr60; BS4449 B500B; JIS G3112; ISO 6935-2
3. Applicable Standard System
Mandatory Domestic Chinese Standards
GB 1499.2-2024 Steel for the Reinforcement of Concrete – Part 2: Hot Rolled Ribbed BarsGB/T 228 Metallic materials – Tensile testingGB/T 232 Metallic materials – Bend testGB/T 17505 General technical delivery conditions for steel and steel products
International Export Standards
ASTM A615, BS 4449, JIS G3112, ISO 6935-2
4. Complete Specification Parameters
Nominal Diameter: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40mm, 50mm
Delivery Forms
Straight Rebar: φ12–50mm, standard fixed lengths 9m, 12m; custom 6m, 15m available
Coiled Rebar (Wire Rod Rebar): φ6–16mm, single coil weight 1.8–3.2 tons, straightened on-site for stirrups and thin reinforcement
Surface Type: Standard crescent transverse ribs (national standard mainstream), free of spiral or herringbone ribs; as-hot-rolled black scale surface without cracks, scabs, lamination or deep rust pits
Permanent Marking: Mill code, steel grade and diameter rolled on bar surface for traceability during site acceptance
Dimensional & Weight Tolerance Control
Diameter tolerance ±0.4~±0.6mm; length tolerance 0~+50mm; compliant negative weight deviation; straightness ≤4mm per meter, flat burr-free ends without deformation.
5. Complete Production Process
Hot metal pretreatment → Converter refining + LF furnace micro-alloy adjustment → Continuous casting square billet → High-temperature heating in walking beam furnace → Multi-pass universal mill rolling → Controlled rolling & cooling for grain refinement → Online marking & coding → Cooling on cooling bed → Fixed-length shearing / coiling → Strapping & stacking → Batch sampling for physical & chemical tests → Finished product warehousing
6. Mandatory Batch Inspection Standards (Sampling per heat batch, re-inspection required for project incoming materials)
6.1 Core Mechanical Property Tests
Tensile test: Yield strength, tensile strength, total elongation Agt; seismic E-grade rebar requires mandatory check of yield-to-tensile ratio and measured yield limit ratio
180° cold bend test: No cracks or fracture on ribs and base metal after bending, compatible with on-site stirrup bending construction
Reverse bend test (Exclusive for E seismic grade): Simulate reciprocating seismic deformation without cracking failure
Spectrochemical analysis: Strict control over harmful impurities C, Si, Mn, S, P to match welding and seismic performance
6.2 Appearance & Dimensional Inspection
Uniform transverse rib height and spacing without missing ribs or denting; surface free of cracks, slivers and folds; diameter, rib dimension and single bar weight verified batch by batch.
6.3 Weight Deviation Inspection
Batch weighing per national standard to ensure compliant negative tolerance, non-substandard lightweight rebar prohibited.
7. Core Product Advantages
Strong rib anchoring force for stable structural safetyStandard crescent ribs form tight mechanical interlock with concrete, greatly improving overall structural bearing capacity and reducing cracking & peeling risks.
Complete seismic grade series for all national seismic zonesE-grade seismic rebar fully complies with national building seismic codes, designated material for schools, hospitals and high-rise buildings to resist alternating seismic load.
Excellent machinability for convenient constructionSupports arbitrary cutting, bending, flash butt welding and mechanical sleeve connection, compatible with stirrups, main reinforcement and embedded parts for all construction processes.
Full strength range for lightweight cost reductionHRB500/600 high-strength rebar can replace traditional low-strength grades, cutting steel consumption under equal load and lowering overall civil engineering cost.
Full specification coverage with two flexible delivery formsLarge-diameter straight bars for main load-bearing reinforcement; small coiled rebar straightened for stirrups, suitable for pile foundations, beams, slabs, walls and foundation reinforcement.
Traceable quality complying with project acceptance codesPermanent rolled surface marking paired with original mill certificates, one-time pass for third-party inspection without rework during acceptance.
8. Main Application Fields
Civil Building Construction (Core Application)High-rise residential buildings, office buildings, shopping malls, schools, hospitals: Pile foundations, ground beams, columns, shear walls, floor slabs, roof load-bearing main bars and stirrups.
Transportation & Bridge EngineeringHighways, railway bridges, tunnels, metro stations, viaducts, subgrade protection and culvert reinforcement.
Water Conservancy & Energy EngineeringReservoir dams, flood control dykes, diversion tunnels, hydropower plant buildings, offshore wind power caps and storage tank foundations.
Municipal InfrastructureUnderground comprehensive pipe galleries, urban interchanges, sewage treatment plants, parking lots and civil air defense basements.
Industrial Plants & Special ProjectsConcrete foundations of steel structure workshops, heavy-duty equipment caps, grain silos, chemical tank bases and airport terminal buildings.
9. Packaging, Loading Port & Lead Time
Standard Export Seaworthy PackagingStraight rebar bundled by same specification & length, each bundle 2–4 tons fastened with multiple steel bands; plastic end caps fitted to prevent collision damage; full stacks loaded on wooden pallets, wrapped with inner waterproof plastic film and outer blue waterproof woven cloth for moisture & rust prevention during sea transportation.
Loading Port: Tianjin Port, shipment available via Qingdao Port and Shanghai Port.
Lead Time
Regular stock HRB400/HRB400E straight rebar φ12–32: 5–7 days
HRB500/HRB500E high-strength seismic rebar, φ6–16 coiled rebar: 8–12 days
Custom HRB600 ultra-high strength, large diameter φ36/40/50: 15–22 days
MOQ & SamplesMinimum order quantity 10 tons; standard test pieces provided free for tensile, cold bend and seismic index testing.
10. Supporting Quality Assurance Documents
Complete set of original Chinese & English factory certificates:
Continuous casting slab melting chemical composition analysis report
Mechanical test report (tensile, cold bend, reverse bend; seismic E-grade with yield-to-tensile ratio data attached)
Dimensional & weight deviation appearance inspection data sheet
GB/ASTM/BS factory certificate, packing list, certificate of origin
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