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Help CenterSteel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPa
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Steel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPaNegotiableMOQ: 5 Metric Tons -
Steel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPaNegotiableMOQ: 5 Metric Tons
-
Steel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPaNegotiableMOQ: 5 Metric Tons
-
Steel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPaNegotiableMOQ: 5 Metric Tons
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Steel Rebar & Ribbed Rebar，HRB335≥335MPa；HRB400≥400MPa；HRB500≥500MPaNegotiableMOQ: 5 Metric Tons
Detailed Specification of Deformed Steel Bar
1. Product Definition
Deformed steel bar, full name Hot-Rolled Ribbed Bar (HRB), is round steel with two longitudinal ribs and evenly distributed crescent transverse ribs on the surface. It is widely used in reinforced concrete structures, which can greatly enhance bonding force with concrete, prevent relative sliding and improve overall structural stability.
2. Execution Standards
National Standard: GB 1499.2-2018 Steel for Reinforced Concrete-Part 2: Hot Rolled Ribbed Bars
Seismic Reinforcement: Grade marked with letter "E" (e.g. HRB400E), meeting special seismic performance indicators
International Equivalent Standards: ISO 6935, ASTM A615, BS 4449
3. Steel Grade & Strength Grade
HRB335 (Grade II Steel): Yield strength ≥335MPa, Tensile strength ≥455MPa, Elongation ≥16%, applied to small and medium-sized civil buildings.
HRB400 (Grade III Steel, Most Popular): Yield strength ≥400MPa, Tensile strength ≥540MPa, Elongation ≥16%, widely used in high-rise buildings, bridges and municipal projects.
HRB500 (Grade IV Steel): Yield strength ≥500MPa, Tensile strength ≥630MPa, Elongation ≥15%, suitable for large-scale bridges, heavy-duty workshops and core load-bearing parts of super high-rise buildings.
Seismic Reinforcement (HRB400E/HRB500E): Require strength-yield ratio ≥1.25, yield ratio ≤1.30, total elongation at maximum force ≥9%, applicable to areas with seismic fortification intensity above grade 7.
4. Specification & Dimension Parameters
Nominal Diameter (mm): 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 32, 40, 50
Length:Straight bars: fixed length 9m / 12m, customized length availableCoiled bars: diameter 6-10mm in coil form, inner coil diameter ≥800mm
Dimensional Tolerance: Diameter deviation ±0.4mm; uniform rib height and spacing; bending degree ≤6mm per meter
Theoretical Weight (kg/m)
| Diameter(mm) | 12 | 16 | 20 | 25 | 32 |
|---|---|---|---|---|---|
| Weight per meter | 0.888 | 1.580 | 2.466 | 3.850 | 6.310 |
5. Chemical Composition (Melting Analysis, wt%)
| Grade | C≤ | Si≤ | Mn≤ | P≤ | S≤ | Ceq≤ |
|---|---|---|---|---|---|---|
| HRB335 | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.52 |
| HRB400 | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.54 |
| HRB500 | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.55 |
Micro-alloy elements such as V, Nb and Ti can be added to improve strength and toughness.
6. Production Process
Long-flow Process (Mainstream): Iron ore & coke → Blast furnace ironmaking → Converter steelmaking → Refining & continuous casting → Billet heating → Rough rolling, intermediate rolling & finish rolling → Rib rolling → Cooling → Shearing → Inspection → Packing
Short-flow Process: Scrap steel → Electric arc furnace steelmaking → Continuous casting → Rolling → Finished products, featured with environmental protection and short production cycle
Core Technology: Post-rolling thermal treatment, fine grain rolling, slitting rolling
7. Mechanical Properties (Core Index)
Yield Strength (ReL): HRB335≥335MPa; HRB400≥400MPa; HRB500≥500MPa
Tensile Strength (Rm): HRB335≥455MPa; HRB400≥540MPa; HRB500≥630MPa
Percentage Elongation after Fracture (A): ≥16% for HRB335/HRB400; ≥15% for HRB500
Cold Bending Property: No crack after 180° cold bending test
Seismic Performance Index (E Grade): Strength-yield ratio ≥1.25; Yield ratio ≤1.30; Total elongation at maximum force ≥9%
8. Packaging, Marking & Delivery
PackagingStraight bars: bundled in 9m/12m length, each bundle 2-5 tons with more than 4 binding strapsCoiled bars: 6-10mm diameter coil, each coil 1-3 tons
Marking: Metal tags attached on each bundle, marked with steel grade, specification, heat number, production date, standard number and manufacturer logo
Delivery Standard: Delivered by theoretical weight or actual weight; weight deviation allowed
Quality Document: Material test certificate provided together with goods, including chemical composition, mechanical property, heat number and inspection report
9. Main Applications
Construction Engineering: Beams, columns, slabs, foundations and pile foundations of residential buildings, office buildings and factories
Municipal Traffic Engineering: Bridges, culverts, tunnels, expressways and railway sleepers
Water Conservancy Engineering: Dams, ship locks, ports and flood control facilities
Seismic Engineering: Buildings in high seismic intensity areas, key projects such as hospitals and schools
10. Quality Inspection Standard
Appearance: No surface cracks, scars and folds; clear and uniform ribs; standard dark grey surface color
Dimension Inspection: Measure diameter and rib height with caliper to meet national standard tolerance
Weight Inspection: Weigh goods and check theoretical weight deviation
Material Verification: Check material certificate, verify heat number, chemical composition and mechanical data
Third-party testing: Tensile test, cold bending test and composition analysis available
11. Product Advantages
High strength: 40%-70% higher strength than plain round steel bar, saving steel consumption
Strong adhesion force: Rib design achieves tight combination with concrete, effectively avoid displacement
Excellent plasticity and toughness: Stable cold bending performance, outstanding seismic resistance and fatigue resistance
Economical and eco-friendly: Recyclable material with long service life, lower overall project cost
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