One of the most crucial construction materials, TMT steel bars or thermo-mechanically treated steel bars are widely used in various kinds of construction projects, be it the construction of multi-storeyed high rise building or any other civil engineering structures. Thanks to their exceptional strength and bonding properties, the builders all across the globe are investing in high-grade TMT bars to impart the much-needed resilience to their buildings that don’t fall short in any aspect.
Since TMT bars are widely used, it becomes all the more important to be extra conscious of certain things when you are purchasing them. But before we delve deeper into this, let’s see why you need TMT bars for your next construction project. Have a look:
Why choose TMT Steel Bars For Your Construction Projects?
From ensuring longevity to providing buildings with high tensile strength, TMT steel bars single out in keeping concrete structures strong for exceptionally longer duration of time. They efficaciously endure stress, safeguarding the structures from damage.
TMT bars are manufactured by leveraging thermo-mechanical treatment. It involves the following steps:
The hot-rolled bars that come out fresh from the finished mill are made to enter ‘thermex system’ which is a water-spray cooling system. Once the bars are passed through thermex system, their outer core starts to cool down in a rapid manner. Consequently, a martensitic rim is created on the outer layer while leaving the inner core hot.
The aforementioned cooling process is known as quenching and is considered one of the most integral steps involved in the manufacturing of TMT steel bars.
Next comes self-tempering. When the rebars come out of the thermex system, the heat flows from the hot core to the cold surface, creating a strengthened structure known as ‘tempered martensite’.
- Atmospheric cooling
After self-tempering, atmospheric cooling takes place. A cooling bed is required to carry out this process. From transforming austenitic core of the steel rebar to ferrite-pearlite structure (that will enable them to resist any seismic activity upon installation), the atmospheric cooling process includes numerous steps that eventually results in the formation of a solid outer layer, leaving the core ductile that provides additional strength to the overall structure.
Thanks to their intricate manufacturing process, the resultant TMT bars are highly ductile, weldable, earthquake and fire-resistant. Another important thing to note here is that TMT steel bars are cost-effective, meaning if you are using TMT steel bars for your construction projects, you can save as much as 20% of the steel without compromising on its strength. The cost-effectiveness of TMT bars comes from the fact that they have higher tensile strength as well as elongation properties that directly translate to reduced use of steel for the same purpose.
While TMT bars have numerous advantages, it often becomes difficult for the builders to choose the best TMT bars manufacturer who can provide them with the highest quality TMT bars.
To help you make a more conscious buying decision, we have curated a list of factors that must be considered while purchasing TMT steel bars. Have a look:
- Types of TMT Grades
Three types of TMT grades are available in India, namely Fe415, Fe500 and Fe600. Generally, the higher the gradeof the TMT bar, the stronger it is as compared to its counterparts. However, one must know that higher grades are also associated with reduced ductility.
For instance, if your construction project is situated in an earthquake-prone zone, you must use TMT bars that are ductile. Hence, lower grade TMT bars are mostly preferred in such cases. It is important that you keep this point in mind when buying TMT bars for your construction project.
- Manufacturing Process
Gone are the days when cold twisted technology was used by TMT bar manufacturers. With the advent of technological innovation, the present-day TMT manufacturing process has become far more advanced. The TMT manufacturing industry is leveraging innovative technology to produce high-quality TMT bars that also involves thermo mechanical treatment besides modern thermex cooling systems. Offering better flexibility and strength to the TMT bars, these modern technologies are a boon to the TMT manufacturing industry as well as to the builders.
That’s why whenever you are purchasing TMT bars, you must put an inquiry with the manufacturer and know more about the manufacturing process.
Certification is one of the most important factors to consider while purchasing TMT steel bars. BIS and ISO certifications act in accordance with the safety standards. Apart from certifications, brand reputation must also be taken into consideration.
If you are purchasing TATA’s TMT bars or JSW’s TMT bars, you can be rest assured as these brands practice stringent quality control measures that further refine their technology-driven TMT bar manufacturing processes and offer you the best quality TMT bars.
- Corrosion Resistance
Corrosion of structures is not just a durability-related concern. From reducing the cross-section to introducing additional stress points, this chemical process affects the overall stability of the structure. Therefore, when you are purchasing TMT bars, only choose those TMT bars that are highly corrosion-resistant. If not, serious complications may arise in the future that will leave your construction project/building highly vulnerable.
Another important factor that you need to consider while purchasing TMT bars is bendability. At times, the design of the building requires rebars that can be bent. In such situations, TMT bars fit in well. A lot of customers majorly focus on the strength of TMT bars without paying much attention to its bendability. However, both the aspects are equally important. While the high tensile strength of TMT bars keep the load off the structure, their bending capacity is ascertained by their bendability. Moreover, bendability is directly proportional to the ductility of TMT bars, meaning if a reinforced bar which is less ductile is bent, chances are that it will break faster than the one that is more ductile.
Since TMT bars are the backbone of the construction buildings, it is crucial to ensure the availability of TMT bars that fulfil the aforementioned criteria. With prominent suppliers like BuildSupply, you can buy quality TMT bars hailing from brands like TATA, JSW, SAIL among many others that will amp up your construction process like never before.