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Steel Rebar & Ribbed Steel Bar，12、14、16、18、20、22、25、28、32NegotiableMOQ: 5 Metric Tons -
Steel Rebar & Ribbed Steel Bar，12、14、16、18、20、22、25、28、32NegotiableMOQ: 5 Metric Tons
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Steel Rebar & Ribbed Steel Bar，12、14、16、18、20、22、25、28、32NegotiableMOQ: 5 Metric Tons
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Steel Rebar & Ribbed Steel Bar，12、14、16、18、20、22、25、28、32NegotiableMOQ: 5 Metric Tons
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Steel Rebar & Ribbed Steel Bar，12、14、16、18、20、22、25、28、32NegotiableMOQ: 5 Metric Tons
Deformed Steel Bar - Product Detailed Description
1. Product Definition
Deformed Steel Bar (Hot Rolled Ribbed Steel Bar) is round in cross-section with two longitudinal ribs and evenly distributed transverse ribs (mainly crescent-shaped). It is widely used in reinforced concrete structures, featuring strong bonding force with concrete and excellent coordinated stress-bearing performance.
2. Implementation Standard
National Standard: GB 1499.2-2024 (Mandatory implementation on September 25, 2024)
Strength Grade: HRB400 (Grade 3 Steel, Mainstream)、HRB400E (Seismic Resistant)、HRB500 (High Strength); The old type HRB335 is gradually phased out.
Code Explanation: H-Hot Rolled, R-Ribbed, B-Steel Bar, E-Seismic Resistant
3. Specification & Dimension (Nominal Diameter: 6–50mm)
| Nominal Diameter(mm) | Inner Diameter(mm) | Theoretical Weight(kg/m) | Standard Length |
|---|---|---|---|
| 12 | 11.5 | 0.888 | 9m/12m (Straight Bar) |
| 16 | 15.4 | 1.580 | 9m/12m |
| 20 | 19.3 | 2.466 | 9m/12m |
| 25 | 24.2 | 3.850 | 9m/12m |
| 32 | 31.0 | 6.310 | 9m/12m |
Weight Tolerance (GB 1499.2-2024):
Φ6–12mm: ±5.5%
Φ14–20mm: ±4.5%
Φ22–50mm: ±3.5%
4. Chemical Composition (Typical Value, wt%)
| Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| HRB400 | 0.20–0.25 | 0.40–0.80 | 1.20–1.60 | ≤0.045 | ≤0.045 |
| HRB400E | 0.20–0.25 | 0.40–0.80 | 1.20–1.60 | ≤0.045 | ≤0.045 |
| HRB500 | 0.22–0.28 | 0.40–0.80 | 1.30–1.70 | ≤0.045 | ≤0.045 |
Core Control: P、S ≤ 0.045% (Prevent brittle fracture); Ceq ≤ 0.54% (Ensure good weldability)
5. Mechanical Properties (GB 1499.2-2024)
| Grade | Yield Strength ReL(MPa) | Tensile Strength Rm(MPa) | Elongation A(%) | Strength-Yield Ratio |
|---|---|---|---|---|
| HRB400 | ≥400 | ≥540 | ≥16 | — |
| HRB400E | ≥400 | ≥540 | ≥16 | ≥1.25 |
| HRB500 | ≥500 | ≥630 | ≥15 | — |
Key for Seismic Grade (E): Strength-yield ratio ≥1.25, Over-yield ratio ≤1.35; Energy absorption and anti-brittle fracture under earthquake conditions.
6. Production Process
Long Process (Mainstream): Iron ore & coke → Blast furnace ironmaking → Converter steelmaking → Continuous casting billet → Hot rolling (1000–1200℃) → Cooling → Fixed-length cutting → Inspection & Packing
Short Process: Scrap steel → Electric furnace steelmaking → Continuous casting → Rolling (Environment-friendly, short production cycle)
Product Form:
Straight Bar: Φ12–40mm, fixed length 9m/12m, bundled per 2–3 tons.
Coiled Ribbed Bar: Φ6–12mm, coil weight 1.5–2.5 tons, used for stirrups and distribution reinforcement.
7. Core Characteristics
High Strength: Yield strength ≥400MPa, material saving and cost reduction.
Strong Concrete Bond: Rib design prevents sliding and ensures coordinated stress bearing.
Seismic Toughness: HRB400E meets seismic standard, not easy to break in earthquake.
Good Weldability: Applicable for flash butt welding and arc welding, convenient construction.
Stable Weather Resistance: Alloy design with good rust and fatigue resistance, suitable for outdoor and humid environments.
8. Application Scope
Building Construction: Frame beams & columns (Φ16–25mm HRB400E), floor slab & shear wall (Φ8–14mm), foundation engineering (Above Φ25mm).
Infrastructure: Bridge pier & box girder, tunnel lining, highway guardrail, port & wharf.
Industry: Factory beam & column, equipment foundation, large structural buildings.
9. Packaging & Delivery
Packaging: Firmly bundled straight bars; coiled bars with moisture-proof packaging. Each bundle attached with label marked with steel grade, specification, heat batch number, production date and execution standard.
Delivery Time: 5–7 working days for conventional sizes.
Quality Document: Official mill certificate attached with goods, including chemical composition, mechanical properties, heat batch number and inspection report.
10. Quality Inspection
Appearance Inspection: No surface crack, scar or fold; clear ribs and qualified dimension.
Dimension Inspection: Measure inner diameter and rib height by caliper; weight deviation complies with GB 1499.2-2024.
Mechanical Test: Tensile test (Yield / Tensile / Elongation), bending test (180° bending without crack).
Composition Test: Spectral analysis of C/Si/Mn/P/S to meet national standard.
11. Storage & Transportation
Storage: Store in dry and ventilated warehouse, pad height over 30cm for moisture proof; classified stacking with clear marking.
Transportation: By truck, train or sea vessel; fix bundled straight bars to avoid deformation, cover coiled bars for moisture protection.
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