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Help CenterSteel Rebar & Ribbed Deformed Steel Bar，HRB400、HRB400E、HRB500、HRB500E
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1. Product Definition
Deformed Steel Rebar, full name Hot Rolled Ribbed Bar, is covered with two longitudinal ribs and evenly distributed crescent transverse ribs. The ribs form mechanical interlock with concrete to greatly enhance bonding force, mainly bearing tensile stress in reinforced concrete structures. It is classified into standard hot rolled rebar, seismic rebar and fine grain rebar.Domestic Standard: GB/T 1499.2-2018 Steel for the Reinforcement of Concrete Part 2: Hot Rolled Ribbed BarsInternational Standards: ISO 6935-2, ASTM A615, BS 4449
2. Grade Naming & Strength Classification
Grade Code Explanation
HRB: Hot-rolled Ribbed BarSuffix number: Minimum yield strength value (MPa)Suffix E: Seismic grade rebar; Suffix F: Fine grain high strength rebar
Main Grades
HRB400 / HRB400E (Most Popular General Grade)Min yield ≥400MPa, min tensile ≥540MPa. HRB400E meets strict seismic indicators including strength ratio and reverse bend test, widely used for residential buildings, factories and road projects.
HRB500 / HRB500E (High Strength Grade)Min yield ≥500MPa, min tensile ≥630MPa, reduces steel consumption. Ideal for high-rise buildings, long-span bridges and large underground utility tunnels.
HRB600 / HRB600E (Ultra High Strength Grade)Min yield ≥600MPa, applied for heavy-load infrastructure, super high-rises and large hydraulic structures.
HRBF400 / HRBF500 Fine Grain RebarProduced via thermo-mechanical controlled rolling with refined grain structure, superior toughness, preferred for low-temperature and key seismic projects.
3. Production Process
Continuous casting billets are heated to 1150–1250℃, then multi-pass hot rolled. Crescent ribs are formed directly by rolling rolls, followed by online temperature controlled cooling, sizing, fixed-length cutting and bundling. The surface is original hot rolled black scale, anti-rust primer can be coated on site upon request.
4. Complete Specification Parameters
Nominal Diameter: 6,8,10,12,14,16,18,20,22,25,28,32,36,40,50mmCommon engineering sizes: 12/16/18/20/22/25/32mm
Standard Fixed Length: 9m,12m; customized 6m,15m,18m extended length available
Theoretical Weight Formula: Weight per meter (kg/m) = Diameter (mm) × Diameter (mm) × 0.00617Example: Φ20 rebar = 20×20×0.00617 = 2.468kg/m
Surface Finish: Original hot rolled black scale, standard crescent ribs (no spiral or herringbone ribs)
Bundling Standard: 2–4 tons per bundle, tightly strapped; marks including heat number, grade, diameter and manufacturer license number are rolled on bar surface.
5. Standard Mechanical Properties
| Grade | Min Yield Strength Re(MPa) | Min Tensile Strength Rm(MPa) | Min Elongation A | Min Total Elongation Agt at Max Force | Special Seismic Requirements |
|---|---|---|---|---|---|
| HRB400 | 400 | 540 | 16% | 7.5% | N/A |
| HRB400E | 400 | 540 | 16% | 9.0% | Tensile/yield ratio ≥1.25; measured yield / standard yield ≤1.30; qualified reverse bend test |
| HRB500 | 500 | 630 | 15% | 7.5% | N/A |
| HRB500E | 500 | 630 | 15% | 9.0% | Same seismic indicators as above |
6. Core Product Advantages
Excellent Bonding Performance with ConcreteInterlocking crescent ribs tightly lock with concrete, prevent steel bar slipping under load and eliminate pull-out failure risk.
Superior Ductility & Seismic ResistanceE grade seismic rebar has sufficient elongation, absorbs seismic energy via plastic deformation without brittle fracture, fully meets national seismic building codes.
Excellent WeldabilityCompatible with electroslag pressure welding, flash butt welding, manual arc welding and gas pressure welding; welding joint strength matches base metal with wide construction window.
Complete Strength Grades for Lightweight DesignHigh strength HRB500/HRB600 reduces reinforcement density, cut total steel consumption and shorten construction period.
Strict Tolerance Control for Dimension & WeightNational standard limits negative weight deviation, weight inspection result cannot be re-tested to guarantee structural bearing capacity.
Convenient Storage & TransportationFixed-length bundled packaging for easy lifting, shipping and on-site cutting; short-term open-air stacking is acceptable.
7. Main Application Fields
Civil ConstructionHigh-rise residential buildings, commercial complexes, factory frames, shear walls, beams, columns, foundation caps and underground garage slabs
Transportation InfrastructureHighways, municipal roads, bridge piers, box girders, tunnel support, metro stations and shield segments
Water Conservancy & HydropowerDams, dykes, reservoirs, pump houses, diversion channels and underground hydraulic galleries
Municipal Public WorksUnderground utility tunnels, sewage treatment plants, rainwater storage tanks and civil air defense projects
Large Special ProjectsAirport terminals, port wharves, stadiums and super high-rise landmark buildings
8. Export Packing, Lead Time & Delivery Documents
PackingRebars of same specification bundled with steel straps, plastic edge protectors at both ends to avoid collision damage; printed marks on surface; waterproof anti-rust film covered for sea shipment.
Lead TimeStandard in-stock HRB400E 9m/12m: 1–3 working daysCustom HRB500E/HRB600 & special extended length: 4–7 working days
Complete Delivery DocumentsMaterial Test Certificate (MTC), Tensile/Bend/Reverse Bend Test Report, Weight Deviation Inspection Report, Factory Inspection Certificate, Spectral Chemical Composition Report
9. Key Acceptance Inspection Items
Verify steel grade, seismic E mark, nominal diameter and fixed length, weight tolerance standard;
Visual inspection: Complete clear ribs, no cracks, scars, folds, severe rust or distortion;
Mechanical recheck: Seismic projects must provide reverse bend and total elongation Agt test reports;
Dimension & weight check: Actual weight per meter shall comply with national negative deviation limits;
Working condition matching guide: HRB400E for general civil buildings; HRB500E for high-rises & long-span bridges; HRB600E for heavy-load large hydraulic projects.
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