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Help CenterSteel Rebar & Ribbed Steel Bar，HRB400、HRB400E、HRB500、HRB500E
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1. Product Overview
Hot Rolled Ribbed Steel Bar (Rebar) is round steel bar with crescent longitudinal & transverse ribs on surface. The ribs greatly improve bonding force with concrete to prevent slip under load. Manufactured from vanadium micro-alloyed clean steel billets via controlled rolling & cooling process, it is divided into ordinary ribbed bar, seismic ribbed bar (suffix E) and fine grain seismic ribbed bar. It features stable yield strength, excellent cold bending, weldability and seismic elongation performance, serving as core load-bearing material for reinforced concrete structures. Widely applied in housing construction, bridges, tunnels, water conservancy and overseas civil engineering. Seismic grades meet code requirements for buildings in 6–9 degree seismic zones.
2. Applicable Standards
Domestic Chinese Standards
GB/T 1499.2-2024 Steel for the Reinforcement of Concrete – Part 2: Hot Rolled Ribbed Bars (Core Standard)
GB 50010 Code for Design of Concrete Structures
GB 55002 General Code for Seismic Design of Buildings
International Export Standards
BS4449, ASTM A706, ISO 6935-2, DIN 488
Supporting Certifications
SGS mechanical & seismic performance test report, original Mill Test Certificate (MTC), CE construction material certification, third-party carbon equivalent inspection report
3. Main Material Grades
3.1 Ordinary Non-Seismic Rebar (Low-rise residential, secondary non-load-bearing components)
HRB335, HRB400, HRB500
3.2 Special Seismic Rebar (High-rise buildings, bridges, seismic engineering, mainstream grade)
HRB400E, HRB500E; letter "E" stands for Earthquake, compulsive seismic indicators of yield-to-tensile ratio & total elongation at maximum force are satisfied
3.3 Fine Grain Seismic Rebar (Large-scale infrastructure, hydropower stations, railway bridges)
HRBF400E, HRBF500E, fine grain structure via controlled rolling with superior toughness & stable aging performance
Export Equivalent Grades
B400B, B500B (BS standard), GR40/GR60 (ASTM A706)
4. Delivery Forms
Straight Rebar (Mainstream for construction sites)Standard fixed length 9m, 12m; customized 6m/8m/15m available, for main load-bearing beams, columns and foundations
Coiled Rebar (Wire Rod Coil)Φ6–Φ10mm delivered in coils, single coil weight 2–3 MT, can be straightened on site for floor slabs & stirrups
5. Complete Production Process
Molten steel refining → Continuous casting round billet → Heating in walking beam furnace at 1100–1200℃ → High pressure water descaling → Multi-pass rough, intermediate & finish rolling to form crescent ribs → Online controlled cooling for grain refinement → Uniform cooling on cooling bed → Straightening to eliminate bending → Fixed-length shearing / coiling → Sampling tensile, cold bending & seismic mechanical test per bundle → Steel marking with grade, heat batch & size → Strapping & palletizing for warehousing
6. Core Technical Parameters
6.1 Size Range
Nominal diameter Φ: 6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,25mm,28mm,32mm,36mm,40mm
Theoretical weight: 0.222–9.865kg/m, weight tolerance ±4% per national standard
Length tolerance for straight bar: +50mm / 0mm; bending deflection ≤4mm per meter
6.2 Reference Key Mechanical Properties (Seismic HRB400E / HRB500E)
HRB400E: Yield ≥400MPa, Tensile ≥540MPa, Elongation ≥16%, Total elongation at maximum force Agt≥9%, Tensile/yield ratio ≥1.25, Yield/tensile ratio ≤0.85 (mandatory seismic index)
HRB500E: Yield ≥500MPa, Tensile ≥630MPa, Elongation ≥15%, Agt≥9%, for long-span & ultra-high-rise heavy load structures
6.3 Surface & Rib Requirements
Continuous intact crescent ribs, free of missing ribs, cracks, scar & lamination; uniform hot rolling mill scale on surface without heavy oil or deep rust pits; specific projected rib area meets national standard for concrete bonding performance
6.4 Processing Performance
No cracks after 180° cold bending; low carbon equivalent, compatible with flash butt welding, lap welding & mechanical sleeve connection without brittle fracture during welding
7. Core Product Advantages
Strong concrete bonding via crescent ribs to avoid structural cracking & slipClosely interlocked with concrete for uniform load transfer, greatly improve overall building stability and prevent separation failure between rebar and concrete.
Qualified seismic indicators for all seismic fortification projectsHRB400E/HRB500E fully meet three mandatory seismic indexes, excellent deformation energy dissipation capacity under seismic load, compulsory for high-rises, bridges & tunnels.
Stable uniform performance via micro-alloying vanadium processVanadium refines grain structure with minimal mechanical fluctuation batch to batch, no aging embrittlement, stable performance for threading, welding & bending processing.
Full size coverage, straight & coiled rebar matching all construction scenariosSmall gauge coils for stirrups & floor slabs, heavy straight bars for beams & foundations, one-stop supply from residential buildings to large hydropower & high-speed railway bridges.
High strength grade reduces steel consumption & construction costHRB500E high strength rebar can replace HRB400E, less steel layout density under equal bearing capacity to save material & labor cost.
Sufficient spot stock & complete export customs clearance documentsRegular stock of Φ12–32mm 9m/12m straight bar & Φ6–10 coil rebar; supply SGS, CE & original MTC for bulk container export to overseas infrastructure projects.
8. Main Application Fields
8.1 Civil & Industrial Building Construction (Largest Consumption)
Beams & columns of high-rise frame, shear wall, basement foundation, bearing cap, floor stirrups, concrete foundation of factory steel structures, cast-in-place villa components
8.2 Transportation Bridge & Road Engineering
Expressway bridges, high-speed railway box girders, tunnel lining, municipal overpasses, concrete pile for dock berths, culvert retaining walls
8.3 Large-Scale Water Conservancy & Hydropower Infrastructure
Hydropower dam body, water diversion tunnel, reservoir gate pier, flood dike concrete rebar, sewage treatment tank main structure
8.4 Municipal Utility Tunnel & Rail Transit
Subway stations, shield tunnels, comprehensive pipe gallery, underground parking garages, seismic load-bearing components for civil air defense basements
8.5 Overseas Civil Engineering Export Projects
Factory, residential, highway & port concrete reinforcement for Southeast Asia, Middle East & Africa, matching export standard grades such as B500B
8.6 Prefabricated Component Factories
Precast floor slabs, precast box girders, concrete pipe piles, main reinforcement & stirrup raw material for precast wall panels
9. Packaging, Shipment & Lead Time
Packaging Methods
Domestic straight rebar: Bundled by same size & fixed length, each bundle 2–4 MT with multi-circumferential steel strapping, iron guard rings at both ends to prevent collision; simple anti-rust film wrapped on bar ends
Coiled rebar: Cross steel strapping, plastic guard ring to protect inner coil, fully wrapped with anti-rust film
Export dedicated packaging: Whole bundle/coil wrapped with thickened waterproof anti-rust plastic film, fixed on IPPC fumigated wooden pallets, fit for 20GP / 40HC container sea transportation
2. Delivery Warehouse: Spot goods shipped directly from Tianjin Port
3. Lead Time: 5–7 days for regular HRB400E straight & coiled stock goods; 10–15 days for customized HRB500E, fine grain HRBF & extra-large diameter orders
4. Payment Term: 30% TT advance deposit, balance settled before shipment, L/C letter of credit is not accepted.
10. Mandatory Full Factory Inspection Items
Spectral chemical composition analysis of raw billets, strictly control harmful impurities C, S, P and calculate carbon equivalent to satisfy welding requirements
Random sampling per bundle/coil for tensile, cold bending & seismic total elongation Agt test (compulsory for seismic rebar)
Full dimension inspection: nominal diameter, rib height, rib spacing, length & theoretical weight deviation
Visual surface inspection bundle by bundle to eliminate cracks, missing ribs & lamination defects
Original Mill Test Certificate, factory certificate and third-party SGS authoritative test report provided
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