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Help CenterSteel Rebar & Deformed Steel Bar，HRB400、HRB400E、HRB500、HRB500E
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Steel Rebar & Deformed Steel Bar，HRB400、HRB400E、HRB500、HRB500ENegotiableMOQ: 5 Metric Tons
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Product Description of Deformed Steel Bar
1. Product Overview
Deformed steel bar is formally named Hot-rolled Ribbed Bar (HRB). Featured with transverse ribs and two longitudinal ribs evenly distributed along the bar length (mostly crescent-shaped ribs), its surface ribs greatly improve bonding force with concrete. As the key load-bearing material for reinforced concrete structures, it is widely applied in residential construction, bridges, road engineering and other civil projects.
2. Applicable Standards
Chinese National Standard: GB/T 1499.2-2024 (replaced former GB/T 1499.2-2018)
Seismic-grade steel: HRB400E & HRB500E (marked with "E" for special seismic requirements)
Fine-grained steel: HRBF400 & HRBF500 (F stands for fine grain with superior low-temperature toughness)
3. Steel Grade & Strength Grade
Grade coding rule: HRB + specified yield strength value; mainstream specifications as below:
| Grade | Former Name | Min Yield Strength (MPa) | Min Tensile Strength (MPa) | Main Application |
|---|---|---|---|---|
| HRB400 / HRB400E | Grade 3 Bar | ≥400 | ≥540 | Civil buildings, bridges, municipal engineering (dominant grade) |
| HRB500 / HRB500E | Grade 4 Bar | ≥500 | ≥630 | Super high-rise buildings, long-span structures |
| HRB335 (phased out) | Grade 2 Bar | ≥335 | ≥510 | Old project renovation, secondary structural components |
4. Dimension Specification & Theoretical Weight
Nominal diameter range: 6~50mm; regular sizes: 12,14,16,18,20,22,25,28,32,40mm
Standard fixed length: 9m & 12m; customized length available from 6m to 18m
Theoretical weight per meter:Φ12:0.888kg/m; Φ16:1.580kg/m; Φ20:2.466kg/m; Φ25:3.850kg/m; Φ32:6.310kg/m; Φ40:9.860kg/m
Dimensional tolerance: diameter tolerance ±0.4~±0.7mm, length tolerance ±50mm
5. Chemical Composition (Typical Value, wt%, HRB400E)
Carbon(C):0.20~0.25; Silicon(Si):0.40~0.70; Manganese(Mn):1.20~1.60
Trace alloy: Vanadium(V)/Niobium(Nb)/Titanium(Ti) for microalloying to upgrade strength and toughness
Impurity control: Phosphorus(P)≤0.045%, Sulfur(S)≤0.045% to guarantee welding property and fatigue resistance
6. Mechanical Properties
Yield Strength (ReL): HRB400≥400MPa, HRB500≥500MPa
Tensile Strength (Rm): HRB400≥540MPa, HRB500≥630MPa
Elongation after fracture(A): ≥16% for HRB400, ≥15% for HRB500
Cold bending property: No crack after 180° cold bending (bending diameter d=3a, a=bar nominal diameter)
Seismic index for E-grade bar: Strength ratio ≥1.25, yield ratio ≤1.30, total elongation ≥9%
7. Production Process
Steelmaking: Blast furnace ironmaking → Converter/EAF steelmaking → LF refining for composition adjustment and impurity removal
Continuous casting: Protective continuous casting to produce qualified steel billets
Hot rolling: Billets heated at 1100~1200℃ → Rough rolling → Intermediate rolling → Finish rolling → Online quenching → Natural cooling on cooling bed
Finishing: Fixed-length cutting → Straightening → Flaw detection → Bundling → Marking & Warehousing
8. Product Advantages
Strong adhesion: Special rib design improves occlusion with concrete to avoid bar slipping
High strength: HRB400 features about 20% higher strength than HRB335 to save steel consumption and lower project cost
Excellent seismic performance: E-grade rebar meets strict seismic indexes and avoids brittle fracture during earthquake
Fine weldability: Low carbon equivalent, applicable for arc welding & flash butt welding
Good anti-fatigue & anti-aging performance: Uniform internal microstructure for long-term stable load bearing
9. Application Fields
Civil construction: Beam, column, floor slab, shear wall & foundation (main size:12~25mm)
Infrastructure: Bridge pier, bridge deck, tunnel lining, highway guardrail (main size:25~32mm)
Water conservancy: Dam, culvert, pump station, dock construction (large diameter:32~40mm)
Industrial building: Factory column, equipment foundation, large stadium structure
10. Packing, Marking & Delivery Terms
Packing: Bundled packing, 2~5 tons per bundle fastened with steel wire or metal strip to prevent deformation in transit
Marking: Metal tag attached on each bundle marked with grade, dimension, standard, batch No., production date & manufacturer; steel grade mark (such as 4E/HRB400E/mill abbreviation) embossed on bar surface
Delivery status: Hot rolled bare finish; spot goods with standard 9m/12m length; shipment within 5-7 days from Liaocheng, Shandong or Tianjin Port
11. Quality Inspection Standard
Appearance inspection: No surface crack, scar or folding; clear rib outline with qualified dimensional tolerance
Mechanical test: One sampling group per batch (max.60 tons) for tensile test & cold bend test to meet specification requirement
Chemical analysis: Sample per heat for composition test of C,Si,Mn,P,S and alloy elements
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