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Help CenterDeformed Steel Bar & Steel Rebar，HRB335、HRB400、HRB400E、HRB500、HRB500E、HRB600
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1. Product Overview
Hot Rolled Ribbed Bar (commonly named Rebar) is hot rolled from steel billets, featuring two longitudinal ribs and crescent transverse ribs evenly distributed on surface. The ribs greatly enhance bonding force with concrete, serving as core load-bearing steel for reinforced concrete structures. It is divided into three categories: standard grade, seismic grade (suffix E), fine grain grade (HRBF). With high strength, excellent plasticity, stable weldability and superior seismic ductility, it is widely applied in buildings, bridges, water conservancy, tunnels, nuclear power and other infrastructure projects.
Production Process: Refined Steel Billet → Furnace Soaking Heating → Multi-pass Continuous Rib Rolling → Online Controlled Cooling → Fixed Length Cutting → Cooling on Cooling Bed → Full Dimensional & Visual Inspection → Mechanical Sampling Test → Bundling, Marking & Shipment
2. Executive Standards & Grade Introduction
2.1 Applicable Standards
GB Standard: GB 1499.2-2024 Steel for Reinforcement of Concrete Part 2: Hot Rolled Ribbed Bars
BS Standard: BS4449 (B500B)
JIS Standard: JIS G3112 (SD390/SD490)
ASTM Standard: ASTM A615 Gr40/Gr60
International Standard: ISO 6935-2
2.2 Grade Naming Rule
HRB = Hot-rolled Ribbed Bar Number = Minimum specified yield strength (MPa) Suffix E = Seismic rebar; HRBF = Fine grain controlled rolling rebar
2.3 Main Grades & Application Matching
| Grade | Strength Class | Performance Features | Suitable Projects |
|---|---|---|---|
| HRB400 / HRBF400 | Grade 3 Standard Rebar | Medium strength, cost-efficient | Ordinary residential buildings, low-rise factories, minor municipal roads |
| HRB400E / HRBF400E | Grade 3 Seismic Rebar | Complies with three seismic indexes, high ductility | High-rise buildings, seismic zone residences, schools, hospitals, main bridge structures |
| HRB500 / HRBF500 | Grade 4 High Strength Rebar | High yield strength, steel consumption saving | Long-span factories, large bridges, tunnel linings, utility tunnels |
| HRB500E / HRBF500E | Grade 4 High Strength Seismic Rebar | Dual high strength & seismic performance | Super high-rises, nuclear power auxiliary buildings, large dams, sea-crossing bridges |
2.4 Chemical Composition Limit (Heat Analysis, Max Mass Fraction %)
| Grade | C | Si | Mn | P | S | Carbon Equivalent Ceq |
|---|---|---|---|---|---|---|
| HRB400 Series | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.54 |
| HRB500 Series | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.55 |
Trace V, Nb, Ti can be added to refine grain and improve strength & toughness. Strict low limit of S & P eliminates welding cold crack and aging brittleness risk.
3. Supply Specifications & Dimensional Parameters
3.1 Nominal Diameter (mm)
Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28, Φ32, Φ36, Φ40
3.2 Standard Fixed Length
9m, 12m as regular stock; customized length 6m / 8m / 10m / 15m available Length tolerance: +50mm / 0mm, camber ≤4mm per meter
3.3 Theoretical Unit Weight (kg/m)
Φ12=0.888, Φ16=1.58, Φ20=2.47, Φ25=3.85, Φ32=6.31, Φ40=9.87 Weight tolerance: ±4% per bundle total weight, ±7% per single bar
3.4 Bundle Weight
Regular bundle weight: 2–4 tons; 40HC container loading capacity 26–30 tons, all export bundles strapped with steel strips.
4. Standard Mechanical Properties (As-hot-rolled Delivery)
| Grade | Min Yield ReL (MPa) | Min Tensile Rm (MPa) | Min Elongation A (%) | Min Total Elongation at Max Force Agt (%) | Min Tensile/Yield Ratio Rm/ReL | Max Measured Yield Ratio ReL(meas)/ReL(spec) |
|---|---|---|---|---|---|---|
| HRB400 | 400 | 540 | 16 | 7.5 | - | - |
| HRB400E | 400 | 540 | 16 | 9.0 | 1.25 | 1.30 |
| HRB500 | 500 | 630 | 15 | 7.5 | - | - |
| HRB500E | 500 | 630 | 15 | 9.0 | 1.25 | 1.30 |
Cold bend requirement: 180° bend test, no cracks, delamination or peeling on ribs and base metal. Seismic rebar passes reverse bend test to avoid brittle fracture under seismic load.
5. Surface Visual Standard
Uniform crescent transverse ribs with consistent height & spacing, no missing ribs, collapsed ribs or burrs;
Uniform hot rolling mill scale permitted on surface; harmful defects including cracks, scarring, folding, slag inclusion and lamination are forbidden;
Permanent rolled marking on each bar: heat number, mill code, grade, diameter for full traceability;
Free of heavy oil or thick rust; light surface rust does not affect mechanical performance and concrete bonding.
6. Core Product Advantages
Superior Concrete Bonding: Continuous crescent ribs form mechanical interlock, stable anchorage to prevent rebar sliding;
Reliable Seismic Performance (Grade E): Strictly meet three mandatory seismic indexes, sufficient deformation energy dissipation under earthquake load;
Excellent Weldability: Low carbon, low sulfur & phosphorus design, compatible with flash butt welding, arc welding and mechanical sleeve connection, pore & crack free welds;
Complete Strength Grades: Full range 400/500 standard & seismic rebar, fit all projects from civil buildings to heavy-duty special infrastructure;
Precise Dimension & Weight: Rolling size and weight deviation comply with national standard to control cutting loss during construction;
Stable Storage & Shipment: Neat bundled shape, anti-deformation, resistant to light rust for short-term open-air storage.
7. Main Application Fields
7.1 Building Construction (Largest Consumption)
High-rise residential buildings, office towers, schools, hospitals, factory frames, shear walls, slabs, beams, columns, foundation piles, underground basement structures
7.2 Transportation Infrastructure
Highways, railway bridges, tunnels, subway & light rail stations, viaduct box girders, retaining walls
7.3 Water Conservancy Works
Reservoir dams, diversion tunnels, sewage tanks, flood dykes, river revetments, underground utility tunnels
7.4 Special Key Projects
Nuclear power auxiliary buildings, port storage yards, airport terminals, large stadiums, sea-crossing bridges
8. Packaging, Marking & Delivery Terms
Seaworthy Export Packaging: Rebars neatly bundled, multi-layer high-strength steel strapping, iron edge protectors fitted on both ends to avoid collision scratch; thin anti-rust oil coated and covered by waterproof tarpaulin for long ocean transit.
Product Marking: Permanent rolled marks on every single bar; metal tag attached to each bundle marked with steel mill, grade, diameter, heat number, weight and standard. Original Mill Test Certificate (MTC) delivered with each truck load.
Lead Time: 3–5 days for standard 9m/12m stock; 7–10 days for customized length, HRB500E high strength seismic rebar.
Logistics & Shipment: Loading at Tianjin Port, full truck or 40HC container export, FOB Tianjin / CFR / CIF trade terms acceptable.
9. Storage, Construction & Operation Precautions
Warehouse must be dry & ventilated; place on wooden skids and cover with waterproof tarpaulin for long open-air storage. Severe rust reduces bonding force and mechanical performance.
Store by separate size & grade, separate standard rebar and seismic rebar to avoid misusage.
Control minimum bending radius during cold forming; sharp forced bending causes rib cracks.
Remove thick mill scale & heavy rust before welding; preheating procedure required for thick diameter rebar welding.
Only E-suffix seismic rebar shall be used for seismic design structures; standard rebar cannot substitute seismic rebar.
All incoming rebar must pass mechanical & weight deviation re-inspection; unqualified products are prohibited for concrete pouring.
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