Hot-rolled deformed bars, commonly known as threaded steel, have longitudinal and transverse ribs on their surface and a solid circular cross-section. They are supplied in long strips or coils, and are abbreviated as HRB. Common grades include HRB400 and HRB500. The numbers represent the yield strength, and the “E” after the numbers indicates the seismic resistance level. They are mainly used in the construction industry, mixed with concrete, to withstand compressive, tensile, and bending stresses.
Wanzhi Steel is a leading Chinese manufacturer of hot-rolled ribbed steel bars, offering straight and coiled bars with diameters from 6-32mm. Material and packaging can be specified, making them a suitable choice for your project.
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Deformed Bar Specification
| Item | Hot Rolled Deformed Bar |
| Place of Origin | Shandong, China |
| Delivery Time | 15-21 days |
| Steel Grade | HRB335/HRB400/HRB500/HRB600, HRB400E/HRB500E (seismic grade), ASTM A615 Grade 40/60/75, BS 4449 460B/500B, A400C/A500C/A600C |
| Standard | GB, ASTM, BS, EN, JIS, DIN |
| Material | Carbon structural steel, low-alloy steel |
| Length | 6M, 9M, 12M |
| Diameter | 6mm 8mm 9mm 10mm 12mm 16mm 20mm 22mm 30mm 32mm |
| Shape | Straight bar, rebar coil (coiled deformed bar) |
| Surface Color | Black |
| Technique | Hot rolling |
| MOQ | 5 Tons |
| Package | Standard Seaworth Packing |
| Trade Term | FOB, CIF, CFR, EXW, etc. |
| Payment Term | T/T 30% prepaid |
| Transportation | By Sea, by bulk Vessel or Container |
Deformed steel bar weight calculation formula
Steel Rebar weight (kg) = diameter (mm)² × 0.00617 × length (m)
Note: Please note that the units here must be consistent with the formula.
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Deformed Bar Features
1. High bonding strength: The surface crescent pattern, equal height ribs, and other deformation designs can be effectively embedded in concrete to form mechanical anchoring, which is more than 30% higher than the bonding strength of smooth steel bars and enhances the integrity of the structure.
2. High yield strength: The yield strength of HRB400 grade threaded steel bars reaches 400MPa, and HRB500 grade reaches 500MPa, which can withstand greater loads.
3. High tensile strength: It can disperse stress more effectively when subjected to tension, thereby increasing tensile strength. Good ductility and excellent seismic performance.
4. Galvanized treatment: The hot-dip galvanized layer protects the steel bars from corrosion and extends the service life to more than 50 years.
5. Easy to process: It can be bent and welded, cold-bent 180° without cracks, and is suitable for complex node construction.
6. Economic benefits: Works with concrete to reduce the amount of steel bars by 10%-15%.
7. Low maintenance cost: Long-term use does not require frequent replacement, and the cost of the entire life cycle is reduced by more than 20%. The shape and size design make it easier to hold and position during construction, helping to improve construction efficiency.
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Common Grade Types
1) HPB300: Plain round steel bar, good ductility, easy to bend, used for ordinary concrete structures.
2) HRB400: Most commonly used ribbed steel bar, with balanced strength and ductility, suitable for high-rise buildings and bridges.
3) HRB400E: Earthquake-resistant type (E stands for earthquake-resistant), low yield strength ratio, used for structures in earthquake-prone areas.
4) HRB500: High-strength steel bar, saves steel consumption, but has slightly poor weldability and needs to control carbon equivalent (CEV ≤ 0.54%).
5) HRB600: Ultra-high strength, used for special projects (such as long-span bridges), requires strict process control.
Note: China standards use HRB400 as the mainstream, and the E suffix is earthquake-resistant steel bar. HRB600 is less used due to its high cost, but it is in line with the trend of green building reduction.
Mechanical Properties of Commonly Used Grades
China Standard
| Brand | Yield Strength（MPa）≥ | tensile strength（MPa）≥ | Elongation after break (%)≥ | Total elongation at maximum force (%)≥ | Bending performance (180°) |
| HPB300 | 300 | 420 | 25 | 10.0 | Diameter ≤25mm: 3d |
| HRB400 | 400 | 540 | 16 | 7.5 | Diameter ≤25mm: 4d |
| HRB500 | 500 | 630 | 15 | 7.5 | Diameter ≤25mm: 6d |
| HRB600 | 600 | 730 | 14 | 7.0 | Diameter ≤25mm: 7d |
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Deformed bar Uses
1. Recommended Applications for Different Diameters
- 6-8mm: Floor slab reinforcement, prefabricated components (composite slabs, stairs), secondary reinforcement, and stirrups for light structures.
- 10-12mm: Stirrups for shear walls and beams, reinforcement at beam-column joints, to enhance shear capacity.
- 14-16mm: Main reinforcement for beams in residential buildings and multi-story factory floors, balancing strength and cost-effectiveness.
- 18-20mm: Main reinforcement for columns in high-rise residential buildings and roof beams in underground garages, for high axial load applications.
- 22-25mm: Main reinforcement for columns in large-span factories and subway platform slabs, to support heavy equipment and crowd loads.
- 28-32mm: Giant columns in super-high-rise buildings, main piers in long-span bridges, for extreme vertical load transfer.
Construction Use
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2. Application Scenarios Divided by Strength Grade
- HRB400 grade rebar
- Civil buildings: Beams, columns, and shear walls for high-rise residential buildings and commercial complexes, meeting standard seismic requirements.
- Municipal infrastructure: Road base reinforcement, main reinforcement for small bridges, for medium traffic load applications.
- HRB500 grade rebar
- Super high-rise buildings: Core tubes, giant columns, and other critical components, to resist extreme loads (wind, seismic events).
- Long-span bridges: Cable-stayed bridges (main span >100m) and anchor zones of suspension bridges.
- Special engineering: Nuclear power plant containment, offshore platform pile foundations, requiring high tensile strength and long-term durability.
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3. Cross-industry Applications
- Building Construction: Used for critical components such as beams, columns, and foundations. HRB400 is ideal for general residential buildings, while HRB500 is preferred for super high-rise structures.
- Long-span Structures: Bridges, stadiums, and other projects requiring high-strength reinforcement to ensure structural safety.
- Transportation Infrastructure: Pile foundations and piers for highways and railway bridges. HRB500 enhances load-bearing capacity for heavy traffic.
- Water Conservancy Projects: Dams, breakwaters, etc. Galvanized or epoxy-coated deformed bars are suitable for humid, corrosive environments.
- Heavy-load Platforms: Factory workshops, storage racks, and other areas requiring heavy machinery support, ensuring ground stability.
- Special Engineering: Nuclear power plant containment, chemical storage tanks, etc. High-strength deformed bars meet strict safety requirements.
- Seismic Reinforcement: Seismic retrofitting of existing buildings, enhancing structural integrity and earthquake resistance.
Surface characters of ribbed steel bars
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Prestressed Steel Bars vs. HR Deformed Bars
Prestressed steel bars are special high-strength steel, different from standard hot-rolled deformed bars.
Prestressing Steel Bars
1. Definition: These are high-strength, low-relaxation steel bars (typically high-carbon or alloy steel) designed for prestressed concrete systems. They are tensioned (pre-tensioned or post-tensioned) before concrete placement, creating permanent compressive stress in the concrete to resist external tensile loads, rather than improving the steel’s own strength.
2. Key Features & Identification:
- Extremely high tensile strength (far exceeding standard deformed bars), low relaxation, and high fatigue resistance.
- Surface is usually smooth or with minor ribs, marked with grade/specification codes (color marking is manufacturer-specific, not universal).
- Used exclusively for large-span, high-load structures (bridges, nuclear containment, precast concrete elements) requiring extreme tensile performance.
3. Mechanical Property: High strength with limited ductility, not suitable for general bending applications in standard construction.
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Deformed Bars
- Definition: The most common concrete reinforcement, manufactured via hot rolling. Its surface features continuous ribs (not threads) to create a strong mechanical bond with concrete, preventing slippage.
- Key Features:
- Excellent bond strength with concrete, balanced strength and ductility for general construction.
- Available in standard grades (HRB400/500, ASTM A615 Grade 60, B500B) and diameters (6mm-40mm), with optional galvanized/epoxy coating for corrosion resistance.
- Not suitable for prestressed applications: Designed for ordinary reinforced concrete, not high-tension prestressed systems.
Deformed Steel Rebar in Bundles
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FAQs
1. Is a deformed bar the same as a rebar?
Rebar (short for reinforcing steel bar) is a general term for all steel used to reinforce concrete. Deformed bars are a specific type of rebar, featuring continuous ribs on the surface to enhance bond strength with concrete. In short: all deformed bars are rebar, but not all rebar is deformed bar (e.g., plain round bars are also rebar).
2. What are the classifications of hot-rolled ribbed steel bars?
- Strength Grade: HRB400/HRB500 (Chinese standard), ASTM A615 Grade 60 (US standard), B500B (European/UK standard), etc.
- Surface Treatment: Black (uncoated), hot-dip galvanized, epoxy-coated for corrosion resistance.
- Form: Straight bars or rebar coils.
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Hot Rolled Deformed Bar Factory – Wanzhi Steel
1. Factory Direct Supply: Eliminating intermediaries, we manufacture and sell our own products, ensuring competitive pricing and consistent quality control.
2. Complete Specifications: We offer diameters from 6mm to 40mm, hardness HRB400/500, ASTM 60 grade, and B500B, conforming to global standards.
3. Reliable Packaging: Standard sea freight packaging protects against damage during long-distance transport. Ample stock of standard sizes ensures timely delivery.
4. One-Stop Service: We provide straight rebar, coiled rebar, and high-strength rebar to meet various construction needs.
Get samples or bulk quotes! Chat with Us Online,
or send an email to: info03@wanzhisteel.com.
Rebar production workshop
Inspection by the quality inspection department
Reinforcing Bars at Factory
Wanzhi Steel Factory is an ISO 9001-certified enterprise located in Hebei, China. Specializing in the production of wire rod, steel reinforcement bar, construction binding wire, galvanized steel pipe, welded rebar mesh for construction. With high-quality products and good services, the products have been exported to more than 120 countries around the world.
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