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Help CenterSteel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mm
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Steel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mmNegotiableMOQ: 5 Metric Tons -
Steel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mmNegotiableMOQ: 5 Metric Tons
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Steel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mmNegotiableMOQ: 5 Metric Tons
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Steel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mmNegotiableMOQ: 5 Metric Tons
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Steel Rebar & Deformed Steel Bar,6、8、10、12、14、16、18、20、22、25、28、32、36、40、50mmNegotiableMOQ: 5 Metric Tons
Detailed Description of Deformed Steel Bars
1. Product Introduction
Deformed steel bar (Hot-rolled Ribbed Bar, abbreviated as HRB) is a long steel product with two longitudinal ribs and evenly distributed transverse ribs on the surface. It has a circular cross-section, and the crescent-shaped transverse ribs do not intersect with longitudinal ribs. It can significantly enhance the bonding force with concrete and prevent relative slippage, serving as the main load-bearing framework for reinforced concrete structures.
2. Executive Standard
National Standard of China: GB 1499.2-2024 (Implemented on September 25, 2024, replacing GB/T 1499.2-2018)
Scope of application: Hot-rolled ribbed bars for reinforced concrete structures, including ordinary hot-rolled bars, fine-grain hot-rolled bars and seismic steel bars.
3. Material & Chemical Composition
Raw material: Carbon structural steel / Low-alloy structural steel (e.g. 20MnSi, 20MnSiV, 20MnSiNb)
Typical chemical composition (wt%):
Carbon (C): 0.20–0.40
Silicon (Si): 0.40–0.80
Manganese (Mn): 1.20–1.60
Phosphorus (P): ≤0.045, Sulfur (S): ≤0.045 (Strict control of impurities)
4. Grade & Mechanical Properties
The grade is marked as HRB plus the minimum yield strength. The letter E stands for seismic-resistant type (e.g. HRB400E).
| Grade | Minimum Yield Strength (Rel) | Minimum Tensile Strength (Rm) | Elongation (A) | Application |
|---|---|---|---|---|
| HRB335 | ≥335MPa | ≥455MPa | ≥17% | Civil buildings, small structural components |
| HRB400 (E) | ≥400MPa | ≥540MPa | ≥16% | High-rise buildings, bridges, factory buildings, seismic engineering (mainstream grade) |
| HRB500 (E) | ≥500MPa | ≥630MPa | ≥15% | Super high-rise buildings, long-span structures, heavy-load projects |
5. Specifications & Dimensions
Nominal diameter (mm): 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 32, 36, 40, 50
Length:
Standard fixed length: 9m, 12m (domestic standard); customized length from 6m to 12m is available.
Coiled deformed bar: Diameter Φ6–Φ12, coil weight: 2–2.5 tons approximately.
Weight tolerance (In accordance with GB 1499.2-2024):
Φ6–Φ12: ±5.5%
Φ14–Φ20: ±4.5%
Φ22–Φ50: ±3.5%
6. Surface Quality Requirements
Surface: Free from cracks, seams, folds and excessive oxide scale; flat and burr-free ends.
Ribs: Even and clear transverse ribs without missing or broken ribs; symmetrical longitudinal ribs with uniform height.
Straightness: Bending deflection per meter ≤ 4mm; total bending deflection ≤ 0.4% of the total length.
7. Production Process
Steelmaking: Molten iron → Converter / Electric furnace → Refining → Qualified steel billet (strict composition control)
Rolling: Steel billet heated to 1100–1250℃ → Rough rolling → Intermediate rolling → Finish rolling → Rib forming
Cooling: Air cooling / Controlled cooling (for fine-grain steel) → Cutting to fixed length → Bundling → Inspection & Warehousing
Standard for seismic bars: HRB400E / HRB500E shall meet the requirements: Strength ratio ≥1.25, Yield ratio ≤1.30, Total elongation at maximum force ≥9%
8. Main Applications
Construction industry: Beams, columns, floor slabs, foundations, shear walls and frame structures of buildings.
Municipal engineering: Bridges, culverts, tunnels, highway & railway subgrades, flood control projects.
Industrial projects: Factory buildings, equipment foundations, large storage tanks, ports and wharves.
9. Packaging & Delivery
Packaging: Delivered in bundles. Each bundle weighs 2–5 tons with firm binding. Metal tags are attached to mark grade, size, heat number and production date.
Delivery condition: Hot rolled state with slight surface rust allowed.
Lead Time: 5-7 working days
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