Deformed bar is deformed steel reinforcement bar, also called a row of steel bars, ribbed bars, or prestressed steel bars. It is a deformed steel bar with ribs, threads, or other shapes on the surface to increase the bond with concrete. Wanzhi Steel specializes in the production of deformed bars, round bars, epoxy coated steel bars, such as d12 reinforcing steel, hot rolled deformed bars, astm reinforcing steel, cold twisted deformed bars, n12 deformed bar, y12 deformed bar are all our hot-selling types. There are a wide range of stock diameters, you are welcome to contact us for more information.

Deformed Bar Specification

Item	Deformed bar( hot rolled ribbed steel, rebar)
Place of Origin	Shandong, China
Delivery Time	15-21 days
Steel Grade	HRB 335/HRB400/HRB500/HRB400E/HRB500E/ASTM A615/BS4449 460B/500B
Standard	ASTM AISI JIS DIN GB BS
Material	Carbon steel: Q195-Q420 Series, SS400-SS540 Series, S235JR-S355JR Series, ST Series, A36-A992 Series, Gr50 Series, etc.
Length	6M 9M 12M
Diameter	6mm 9mm 12mm 10mm 16mm 22mm 30mm
Shape	Straight-bar, Rebar coil, Ribbed Steel Bar, Round bar
Surface	Epoxy coating, screw-thread, galvanized
Technique	Hot roll, cold roll, cold drawn, etc.
MOQ	5 Tons
Package	Standard Seaworth Packing
Trade Term	FOB, CIF, CFR, EXW, etc.
Payment Term	T/T 30% prepaid
Transportation	By Sea

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.

 

Common grades

1) HPB300: Plain round steel bar, good ductility (elongation ≥ 25%), easy to bend, used for ordinary concrete structures.
2) HRB400: Most commonly used ribbed steel bar, with balanced strength and ductility (elongation ≥ 16%), 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

Deformed bar features

Ribbed steel bars have the following significant advantages.

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.

Deformed bar Uses

Cross-industry Applications

1. Construction: used for key components such as beams, columns, and plates, HRB400 grade steel bars are suitable for ordinary residences, and HRB500 grade steel bars are used for super high-rise buildings.
2. Long-span structures: bridges, gymnasiums, and other scenes that require high-strength steel bars to ensure structural safety.
3. Transportation: pile foundations and piers of highways and railway bridges, HRB500 grade steel bars improve bearing capacity.
4. Water conservancy projects: dams, breakwaters, etc., galvanized and epoxy-coated threaded steel bars adapt to humid environments.
5. Heavy-load platforms: areas such as factory workshops and storage shelves that need to withstand heavy machinery to ensure the stability of the ground structure.
6. Special equipment: nuclear power plant containment, chemical storage tanks, etc., high-strength threaded steel bars meet special safety requirements.
7. Prestressed concrete: used to make prestressed bars, improve structural crack resistance and stiffness, and extend service life.
8. Seismic reinforcement: seismic upgrade of old buildings, threaded steel bars enhance structural integrity.
9. Functional upgrade: parking lots, industrial plants, etc., add floors and provide reliable support.

 

Application scenarios divided by strength grade

HRB400 grade rebar (Class 3 rebar)
1. Civil buildings: beams, columns, and shear walls of high-rise residential buildings and integrated shopping malls, meeting conventional seismic fortification requirements.
2. Municipal roads: road base reinforcement, main reinforcement of small bridges, bearing medium traffic loads.
HRB500 grade rebar (Class 4 rebar)
1. Super high-rise buildings: key parts such as core tubes and giant columns need to resist extreme loads (such as wind vibration and earthquakes).
2. Long-span bridges: cable-stayed bridges with a main span of more than 100 meters and cable tower anchorage areas of suspension bridges.
3. Special engineering: nuclear power plant containment, offshore platform pile foundations, requiring high tensile strength and durability.

 

Application scenarios divided by diameter

6-8mm: floor reinforcement, prefabricated components (composite slabs, stairs), secondary structures (structural columns, ring beams).
10-12mm: stirrups of shear wall edge components, densified areas of beam-column nodes, to improve shear bearing capacity.
14-16mm: main reinforcement of ordinary residential frame beams, multi-story factory floor beams, balance stiffness and cost.
18-20mm: main reinforcement of high-rise residential frame columns, underground garage roof beams, to cope with large axial compression ratios.
22-25mm: main reinforcement of large-span factory columns and subway platform slabs, to bear heavy equipment or crowd loads.
28-32mm: giant columns of super-high-rise buildings, main piers of large-span bridges, to transmit 10,000-ton vertical forces.
36-50mm: offshore wind power monopile foundations, UHV transmission tower foundations, to resist extreme environments (typhoons and waves).

Deformed bar classification

Deformed steel bars can be divided into many types according to their shapes, sizes, and uses. For example, hot-rolled ribbed steel bars HRB335 and HRB400 are common types of deformed steel bars, which have different yield strengths and tensile strengths and are suitable for different engineering needs.

If you want to know more about the types of steel rebars, please read – How Many Types Of Reinforcing Bars Are There?

What is the difference between prestressed steel bars and deformed bars?

Prestressing steel bars

1. Definition: Prestressed steel bars are steel bars that have been prestressed. During the production process, pre-tensioning or post-tensioning methods are used to apply prestress to the steel bars to generate a certain tensile stress inside them. This treatment method can significantly improve the tensile strength and fatigue resistance of steel bars.

2. Identification method: Prestressed steel bars are mainly used in concrete structures that need to withstand large tension and pressure. These structures often have high requirements on the strength and stability of the material. Its surface has many ring-shaped skeletons and raised fine particles, which are signs of prestressing. And there are usually blue colored lines and logos engraved with letters and numbers on the surface to distinguish its variety, strength, material, and other information.

3. Bending test: After bending the steel bar to a certain angle and releasing it, the prestressed steel bar will immediately stretch outward instead of rebounding to its original shape.

 

Deformed bars

1. Definition: The surface of the deformed steel bar has ribs, threads or other shapes of deformation. This deformation is formed during the steel bar production process through processes such as hot rolling or cold rolling. Deformed steel bars usually have identification information such as model and specification.

2. The main feature: it has a strong bond with concrete and can be used as prestressed steel bars after cold drawing.

 

In summary, prestressed steel bars are commonly used in bridge construction and large-scale factory building construction. Deformed steel bars are commonly used in structures such as house structures, road and bridge steel mesh, and steel cages. Therefore, deformed steel bars are more common in various reinforced concrete structures, and prestressed steel bars are more common in large-span bridges.

Is a deformed bar the same as a rebar?

Rebars refer to reinforcing steel bars, including deformed bars or debars, concrete reinforcement bars, or, in the Filipino term kabilya, which are round steel bars with protrusions called deformations used as tension devices in reinforced concrete to strengthen and hold the concrete together. The deformed steel bars specifically refer to steel bars with ribs and threads on the surface. They are containment relationships.

What are hot rolled steel bars and cold rolled steel bars?

The main difference between the two is the processing method. The following is a detailed explanation:

Hot rolled steel bars

1. Definition: Hot-rolled steel bars are finished steel bars that are hot-rolled and naturally cooled. They are made of low-carbon steel and ordinary alloy steel pressed at high temperatures. The production process includes heating, hot rolling, cooling, etc.

2. Features: Hot-rolled steel bars are soft steel, and necking occurs when they break, with a large elongation. The diameter range is wide, generally 6.540 mm in diameter, of which the 6.59 mm diameter steel bars are mostly rolled into wire rods.

 

Cold rolled steel bars

1. Definition: Cold-rolled steel bars are steel bars obtained by cold processing hot-rolled steel bars. Usually, the steel bars are cold-drawn, drawn, or cold-rolled at room temperature. The production process includes cold drawing, cold drawing, or cold rolling. The steel bars are plastically deformed by machinery. The cold rolling process can further increase the yield point and strength of the steel bars.

2. Features: The bonding strength with concrete is high. Due to the appearance of crescent-shaped cross ribs, it has better bonding performance and anti-slip performance.

Get deformed bar price from Wanzhi Steel

Wanzhi Steel have established a multilingual sales team, which is online 24 hours a day. We also provide straight bars and deformed bar in coil. In addition, we also have deformed rod, deformed round bar, high tensile deformed bar, hot rolled deformed steel bars, and  plain bars.

Furthermore: the  Steel Reinforcement Mesh, GI Concrete Mesh, Flat steel, galvanized coil/sheet/strip, and color coated coil/sheet/strip are also on sale~

 

 

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or send an email to: info03@wanzhisteel.com.

 

Wanzhi Steel Factory is an ISO 9001 certified enterprise located in Hebei, China. Specializing in the production of steel reinforcement bar, concrete rebar, ribbed bar, and hot dipped galvanized rebar with high-quality products and good services, the products have been exported to more than 120 countries around the world.

 

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