An Introduction To Deformed Rebars And Its Applications

Rebars or reinforcement bars are absolutely crucial when it comes to construction projects, especially when these projects use concrete to build their structures. Concrete structures are strong, but they don’t have a very high tensile strength. Because of this feature, they break easily under pressure. To offer the concrete structures the missing tensile strength, rebars or reinforcement bars are used. Among the different kinds of reinforcement bars, deformed rebars are said to be the best kind. They have ribs, lugs, or indentation on their surfaces which allows them to have a better hold on the concrete, ultimately contributing to the strength of the structure.

Benefits Of Deformed Rebars

There are quite a few benefits of deformed rebars over other kinds of structural steel. It is for the same reason that they’re so widely used. Some of the benefits of deformed bars are as follows.

  • The ratio of carbon in the overall steel composition is quite low, which gives the deformed bars its well known feature – high ductility. This allows them to withstand major natural disasters.
  • As mentioned above, deformed rebars are also known for their ability to bond very well with concrete. This offers the concrete the flexibility and tensile strength that has been missing.
  • As the carbon content in deformed steel is quite low, it is believed to have superior welding features. They can be easily welded, and generally, it is through welding that they’re joined together to make structures.
  • Deformed rebars have a very wide range of applications. They are used in residential and commercial buildings, to build industries and plants, different kinds of bridges, and so on.
  • Malleability is one of the features of deformed steel bars that it is so well known for. It can be used for tension and compression reinforcement, also, its shape can be altered with a lot of bending and rebending.

Types Of Deformed Steel Bars

There are so many types of deformed steel bars that are used in concrete structures. The major ones among them are TMT Bars, high strength deformed bars, and hot-rolled deformed bars. These deformed steel bars are a little different from each other when it comes to purposes, but when it comes to manufacturing, that’s where everything changes. Their properties are also slightly different from each other. TMT stands for Thermo Mechanically Treated. These are hard on the outside and soft on the inside. They are known to have really high tensile strength, extreme bending ability, and highly resistant to stress. 

Deformed Rebars

Yet another kind of deformed rebars are HSD steel bars or high-strength deformed steel bars. Hot-rolled deformed steel bars are coldly twisted to form these rebars. HSD is probably the strongest kind of deformed steel bar, as one can notice the most superior forms of rebars attributes in this kind. The third kind of deformed steel bar type is a hot rolled deformed steel bar. Not as strong as the other bars mentioned here, this is the most common type of deformed steel bar. It is used in general RCC construction projects.

Difference Between Plain Bar And Deformed Bar

Plain Bar and Deformed Bar are both kinds of steel bars. These are used in steel and concrete structures for reinforcement purposes. Steel bars, both plain and deformed, contribute to making the building more flexible, stronger, and resistant to stress. The major difference between the plain bar and the deformed bar is the outer surface. While the plain bars are smooth in texture, the deformed bars have lugs and indentations on them. These indentations help the steel bar have a better grasp over the concrete so that their union is stronger and long-lasting.

When it comes to the choice of the builders, they tend to go with deformed bars rather than plain bars, especially when it comes to concrete-based structures. Concrete is strong on its own, but under pressure, it tends to break easily, thanks to the missing tensile strength. It is for the same reason that steel bars are used to support it. With the added tensile strength, the structure is able to withstand natural disasters with relative ease. The use of deformed steel bars further contributes to the strength of the concrete structure. When it comes to choosing between a plain bar and a deformed bar, one should always go with the latter one, with regards to certain kinds of structures.

Different Steel Bar Grades

There are quite a few steel bar grades that are available for use for different purposes. These steel bar grades differ from each other in their composition and their purposes.


GB1499.2-2007 is a European standard steel bar. There are different steel bar grades within this standard. Some of them are HRB400, HRB400E, HRB500, and HRB500E grade deformed steel bars. Generally, GB1499.2-2007 standard deformed steel bars are made using the hot-rolled method, meaning that these are the most common types of deformed steel bars. These are available in different lengths and sizes, all the way from 6 mm in diameter to 50 mm in diameter. When it comes to length, 9 m and 12 m are the common sizes.


BS4449 is yet another deformed steel bar standard. It is also differentiated as per European standards. When it comes to manufacturing, the steel bars falling in this standard are also hot rolled, which means that they are also used for general purposes, i.e. in common construction projects. These deformed bars are also available between 12 mm to 30 mm diameter size. And the common lengths that they are available in are 9 m and 12 m. Though, it might vary highly.


Unlike the former two kinds, ASTM A615 is a deformed steel standard categorized under American standards. These are generally available in diameter between 9.5 mm and 43 mm, and length between 6 m and 12 m. Generally, the steel bars that fall under this standard are under deformed or plain carbon steel. The grades that fall within this standard are Grade 40, Grade 60, Grade 75, and Grade 80.

Frequently Asked Questions

When it comes to steel in general, and not just deformed steel bars, there are so many frequently asked questions that exist. Since deformed steel bars have a wide range of applications, it is important that the users are well informed about them. The following are the two most frequently asked questions about deformed steel bars.

Where Can I Have Rebars Tested?

There are different tests for rebars that are conducted to determine the overall quality. The tests include the tensile strength test, bend test, rebend test, and so on. These are conducted during various levels of the production process, and after the end result is ready. One can have their rebars tested at the rebar manufacturing industries.

What Is The Difference Between Mild Bars And Deformed Rebars?

The main difference between mild bars and deformed rebars is their surface, The surface of mild bars is generally plain and smooth, however, on the surface of the deformed rebars, there are indentations, lugs, and ribs. Despite the differences, both bars are used with concrete to offer the missing flexibility and tensile strength.

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