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Help CenterSteel Rebar & Construction Rebar，HRB400、HRB400E、HRB500、HRB500E
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1. Product Overview
Deformed steel rebar, full name hot rolled ribbed steel bar, is the core load-bearing steel for reinforced concrete structures. Its surface is equipped with two longitudinal ribs and evenly distributed transverse crescent ribs. The ribs greatly enhance bonding force with concrete to prevent sliding under load and improve the overall seismic resistance and bearing capacity of buildings. Produced by hot rolling low-alloy killed steel billets, rebar features high yield strength, excellent elongation, stable weldability and cold bending performance. Widely applied in residential buildings, high-rises, bridges, tunnels, infrastructure, water conservancy projects and factory concrete structures.
Main Implementation Standards
Chinese National StandardGB/T 1499.2-2018 Hot Rolled Ribbed Steel Bars
International Export StandardsASTM A615 Gr40 / Gr60BS 4449 B500BDIN 488, EN 10080JIS G3112 SD295 / SD400 / SD490
Supporting Test StandardsTensile test, total elongation at maximum force, 180° cold bending test, reverse bending test (seismic rebar), spectral composition analysis
2. Main Steel Grades & Applicable Working Conditions
2.1 HRB400 / HRB400E (Most Popular Grade, E stands for seismic resistance)
Mechanical index: Yield strength ≥400MPa, Tensile strength ≥540MPa, Elongation ≥16%
Application: Ordinary residential buildings, factories, municipal roads, low-rise frames, conventional bridges; HRB400E for seismic fortification buildings, schools, hospitals, high-rises and seismic zone projects
Performance: Balanced strength, toughness and weldability with optimal cost performance, widely used in domestic infrastructure
2.2 HRB500 / HRB500E High Strength Seismic Rebar
Mechanical index: Yield strength ≥500MPa, Tensile strength ≥630MPa, Elongation ≥15%
Application: Super high-rise buildings, long-span bridges, heavy-duty factories, large dams, subway tunnels, heavy-duty pile foundations
Performance: High yield strength reduces steel consumption under identical load, lower self-weight and total project cost; HRB500E meets high-intensity seismic design requirements
2.3 HRB335 Ordinary Grade Rebar
Mechanical index: Yield strength ≥335MPa, Tensile strength ≥455MPa
Application: Low-rise civil buildings, small structures, secondary non-load-bearing components
Performance: Good ductility and easy welding, mainly used for simple small-scale projects
2.4 HRBF400 / HRBF500 Fine Grain Rebar
Performance: Refined grain structure with superior low-temperature toughness and anti-aging property
Application: Buildings and bridge projects in cold northern regions
3. Specification Parameters
Nominal Diameter Range: Φ6mm, Φ8mm, Φ10mm, Φ12mm, Φ14mm, Φ16mm, Φ18mm, Φ20mm, Φ22mm, Φ25mm, Φ28mm, Φ32mm, Φ36mm, Φ40mm
Supply Forms
Straight rebar: Standard fixed lengths 9m, 12m; customized 6m / 15m random lengths available
Coiled rebar: Φ6–Φ12mm supplied in coils, convenient for on-site straightening processing
Theoretical Weight Formula: W=0.00617×d² (kg/m, d = nominal diameter mm)
Dimensional Tolerance: Inner diameter, rib height and rib spacing strictly comply with GB/T1499.2 standard to guarantee bonding performance
Surface Appearance: Crescent transverse ribs, hot rolled black oxide surface, free of cracks, scabs, lamination and folding defects
4. Complete Production Process
Steelmaking Refining: Converter + LF secondary refining furnace, strictly limit S & P impurities, add trace Nb/V alloy elements to upgrade strength and toughness
Continuous Casting Slab: Continuous casting of qualified rectangular slabs, surface grinding to remove subcutaneous defects
High-temperature Heating: Uniform heating to 1100–1250℃ for full austenitization
Multi-pass Continuous Rolling: Rough, intermediate and finish rolling to form standard crescent ribs simultaneously
Online Water Cooling: Thermo-mechanical controlled cooling to stabilize metallographic structure and raise yield strength
Natural cooling on cooling bed, straightening and cutting to fixed lengths
Batch physical & chemical mechanical inspection, full visual inspection, marking and bundling for warehousing
5. Mandatory Factory Inspection Items
Spectral composition test: Strict control of carbon equivalent, S, P, Mn, Si and trace alloy elements
Tensile mechanical test: Yield strength, tensile strength, elongation, total elongation at maximum force (mandatory index for seismic rebar)
Cold bending / reverse bending test: No cracks or lamination after 180° bending; reverse bending test required for seismic grades
Dimensional inspection: Random check of nominal diameter, rib height, rib spacing and theoretical weight
Full surface visual inspection: Free of cracks, scabs, peeling, scratches and excessive rust
6. Main Application Fields
Civil Construction: Frame beams, columns, floor slabs and pile foundations of high-rise apartments, office buildings, shopping malls, schools and hospitals
Transportation Infrastructure: Highway & railway bridges, tunnels, subway stations, viaduct subgrades and guardrail piles
Water Conservancy & Municipal Works: Reservoir dams, flood dykes, sewage treatment plants, utility tunnels and municipal roads
Industrial Factories: Heavy steel structure workshops, logistics warehouses, equipment foundations and heavy-duty floor slabs
Special Projects: Nuclear power auxiliary civil works, port terminals, large foundation pit support, primary reinforcement for prestressed structures
7. Core Product Advantages
Strong Bond Anchorage: Standard crescent ribs create tight interlock with concrete to eliminate sliding risk under load, high structural safety factor
Stable Seismic Performance: HRB400E / HRB500E seismic rebar meet national seismic standards, resistant to brittle fracture under strong earthquakes
Balanced Mechanical Properties: High strength matched with excellent elongation, suitable for cold bending, welding and lap splicing
Full Specification Coverage: From small-diameter coils up to Φ40mm straight bars, compatible with all reinforcement design requirements
Cost Saving: High-strength HRB500 reduces reinforcement density and total steel consumption to cut overall project cost
Stable mass supply with abundant spot stock of regular sizes, fast delivery for large infrastructure bulk procurement
8. Delivery, Packing & Logistics
Delivery State: Hot rolled black oxide surface without coating; epoxy anti-corrosion coated rebar available upon request
Bar Marking: Each bar end embossed with grade, diameter and mill logo; each bundle fitted with metal tag including heat batch number, dimension, weight and execution standard
Packing Standard: Straight bars cross-bound with steel strips, single bundle weight 2–4 tons; coils fixed with steel strips and covered with rainproof film
Delivery Lead TimeIn-stock HRB400 / HRB400E straight bars & coils: Delivery within 3–7 days; customized HRB500E, special fixed lengths and epoxy coated rebar: 7–10 days, bulk carrier & container shipment available from Tianjin Port
Attached Shipping Documents: Original Mill Test Certificate, tensile & bending test report, factory certificate, third-party re-inspection report (for export orders)
9. Procurement & Selection Guidelines
Ordinary low-rise buildings, factories and municipal roads: HRB400 standard rebar for best cost performance
Seismic zone residential buildings, schools, hospitals and high-rise frames: HRB400E seismic rebar
Super high-rises, long-span bridges, subways and heavy-duty dams: HRB500E high strength seismic rebar
Small simple structures and secondary reinforcement: HRB335 rebar
On-site straightening for small components: Φ6–Φ12 coiled rebar
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