HRB400 HRB500E Ribbed Corrugated Carbon Steel Rebar Straight Iron Reinforcing Hot-Rolled ASTM A615 Cutting Punching Decoiling

Rebar (short for reinforcing bar), known when massed as reinforcing steel or reinforcement steel, is a steel bar used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has low tensile strength. Rebar significantly increases the tensile strength of the structure. Rebar's surface features a continuous series of ribs, lugs or indentations to promote a better bond with the concrete and reduce the risk of slippage.

What is Rebar?
Steel reinforcement bars or rebars are used to improve the tensile strength of the concrete, since concrete is very weak in
tension, but is strong in compression. Steel is only used as rebar because elongation of steel due to high temperatures (thermal expansion coefficient) nearly equals to that of concrete.

Deformed Steel Bar

Deformed steel bars have ribs, lugs and indentation on the surface of the bar, which reduces the major problem that is faced by mild steel bar due to slippage and good bonding is achieved between concrete and rebar. The tensile properties is higher compared to other rebars. These bars are produced in sections from 6 mm to 50 mm dia.
Types of Deformed Steel Bars
1. TMT Bars (Thermo Mechanically Treated Bars)
Thermo Mechanically Treated Bars are hot treated bars that are high in strength used in reinforced cement concrete (RCC) work. It is the latest induction in the MS steel bars with superior properties such as strength, ductility, welding ability, bending ability and highest quality standards at international level.

Characteristics of TMT Rebars
* Better ductility and malleability
* High yield strength and toughness
* More bonding strength
* Earthquake resistance
* Corrosion resistance
* High thermal resistance
* Economical and safe in use
* No loss in strength at welded joints
* Ordinary electrodes used for welding the joints

2. High Strength Deformed Bars
High strength deformed bars are cold twisted steel bars with lugs, ribs, projection or deformation on the surface. It the
extensively and majorly used for reinforcement purposes in a construction. These bars are produced in sizes or sections from 4 mm to 50 mm in diameter.Fig 4: Deformed HSD Steel Bar

Characteristics of HSD Rebar
* Low carbon value - HSD Bars have lower carbon level, resulting in good ductility, strength and welding ability.
* Superior bonding strength - HSD bars are well known for their excellent bonding strength when used with concrete.
* Welding capability - Since these bars have lower carbon content, they have 100% welding capability than conventional bars.
* High tensile strength - HSD bars feature high tensile strength. They offer great asset in construction process, where a lot of bending and re bending is required.
* Wide application range - These bars have wide application range like in building residential, commercial and industrial
structures, bridges, etc.
* Satisfactorily malleability - Minimum weight and maximum strength and suitable for both compression and tension reinforcement.

Other Types of Rebars
Depending upon the type of material used in the production of rebar, different types of rebars are
1. European Rebar
European rebar is made of manganese, which makes them bend easily. They're not suitable for use in areas that are prone to extreme weather conditions or geological effects, such as earthquakes, hurricanes, or tornadoes. The cost of this rebar is low.

2. Carbon Steel Rebar
As the name represents, it is made up of carbon steel and is commonly known as Black Bar due to carbon colour. The main drawback of this rebar is that it corrodes, which adversely effect the concrete and structure. The tensile strength ratio coupled with the value makes black rebar one of the best choices .

3. Epoxy-Coated Rebar
Epoxy-coated rebar is black rebar with an epoxy coat. It has the same tensile strength, but is 70 to 1,700 times more resistant to corrosion. However, the epoxy coating is incredibly delicate. The greater the damage to the coating, the less resistant to corrosion.Fig

4. Galvanized Rebar
Galvanized rebar is only forty times more resistant to corrosion than black rebar, but it is more difficult to damage the coating of galvanized rebar. In that respect, it has more value than epoxy-coated rebar. However, it is about 40% more expensive than epoxy-coated rebar.Fig 7: Galvanized Rebar

5. Stainless Steel Rebar
Stainless steel rebar is the most expensive reinforcing bar available, about eight times the price of epoxy-coated rebar. It is
also the best rebar available for most projects. However, using stainless steel in all but the most unique of circumstances is often overkill. But, for those who have a reason to use it, stainless steel rebar 1,500 times more resistant to corrosion than black bar; it is more resistant to damage than any of the other corrosive-resistant or corrosive-proof types or rebar; and it can be bent in the field.

ASTM Standard Codes for Carbon Steel Bars ASTM-A615: Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement is the code for carbon steel bars or blacks bars. The code covers four grades, Grade 40, 60, 75, and 80.  ASTM A615 bars are commonly used in low-stress and less-demanding applications. It is economical in situations where a tremendous level of tensile strength is not necessary. The strength of black bars are dependent on the grade and they are available in various standard sizes.