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Help CenterSteel Rebar & Deformed Steel Bar，HRB335、HRB400/HRB400E、HRB500/HRB500E
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Deformed Steel Bar Product Specification
1. Product Introduction
Deformed steel bar, officially named Hot Rolled Ribbed Steel Bar, features longitudinal and transverse ribs on the surface with a round cross-section. Its crescent-shaped transverse ribs deliver excellent adhesion to concrete. It is a key load-bearing material widely used in reinforced concrete structures.
2. Executive Standards
National Standard: GB/T 1499.2-2024 (implemented in September 2024, replacing the 2018 version)
Seismic-resistant grade: HRB×××E (E stands for seismic resistance)
3. Strength Grades & Grades
| Grade | Designation | Yield Strength | Tensile Strength | Common Name |
|---|---|---|---|---|
| Grade 2 | HRB335 | ≥335MPa | ≥455MPa | Traditional Grade 2 Bar |
| Grade 3 | HRB400 / HRB400E | ≥400MPa | ≥540MPa | Grade 3 Bar / Seismic-resistant Grade 3 Bar |
| Grade 4 | HRB500 / HRB500E | ≥500MPa | ≥630MPa | Grade 4 Bar / Seismic-resistant Grade 4 Bar |
4. Specifications & Parameters
Common nominal diameters: 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm
Wire rod deformed bar: Φ6mm, Φ8mm, Φ10mm
Standard fixed lengths: 9m, 12m (custom lengths available)
Theoretical weight (kg/m):
Φ12: 0.888
Φ16: 1.580
Φ20: 2.466
Φ25: 3.850
Φ32: 6.310
5. Material & 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 Vanadium/Niobium/Titanium; Phosphorus (P) ≤0.045, Sulphur (S) ≤0.045
6. Production Process
Long process: Iron ore → Ironmaking in blast furnace → Steelmaking in converter → Continuous casting billet → Heating (over 1100℃) → Rough rolling, intermediate rolling & finish rolling (rib forming) → Cooling → Fixed-length cutting → Flaw detection & marking → Packaging & warehousing
Short process: Scrap steel → Electric furnace steelmaking → Follow the subsequent procedures of the long process
7. Main Characteristics
Strong adhesion: Surface ribs tightly bond with concrete to prevent sliding, owning superior anchoring performance compared with plain round bars.
High strength: HRB400E is the mainstream grade with high strength, good toughness and outstanding seismic performance.
Easy processing: Available for bending, welding and mechanical connection, suitable for complex reinforcement designs.
Cost-effective: High strength reduces steel consumption, lowering overall structural weight and construction cost.
8. Application Scope
Civil buildings: Beams, columns, slabs and foundations of residential buildings, office buildings.
Municipal works: Bridges, tunnels, culverts, subways and airport runways.
Infrastructure: Expressways, railways, ports and water conservancy dams.
Industrial buildings: Factory workshops, warehouses and heavy equipment foundations.
9. Packaging & Marking
Packaging: Delivered in bundled units, each bundle weighs 2 to 5 tons with firm binding and neat ends.
Marking: Designation, diameter and manufacturer logo are rolled on the bar surface. The quality certificate includes heat number, chemical composition, mechanical properties and applicable standards.
10. Quality Inspection Standards
Appearance: No cracks, seams or laps on surface; clear ribs and qualified dimensional tolerance.
Mechanical properties: Yield strength, tensile strength, elongation and cold bending test shall comply with relevant standards.
Chemical composition: Content of carbon, silicon, manganese, sulphur and phosphorus meets standard requirements.
11. Delivery & Storage
Delivery condition: Hot rolled, uncoated and delivered in bare bundles.
Storage: Store in dry and ventilated areas, keep away from rain and moisture to avoid rusting. Stack by categories to prevent mixing of different products.
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