Regarding steel bars, flexibility is one of the most critical components that steel rolling mills focus on. With high levels of flexibility, the steel bars can bend effortlessly without breaking. This allows the construction to withstand extra load impact during events such as natural calamities without compromising the structure.
Amongst all the steel bars that are currently in production, TMT bars are one of the flexible steel bars with the best tensile strength. The added benefit of TMT bars being fire and corrosion-resistant makes these bars a preferred choice over any other steel bar. These types of TMT bars are prevalent in countries that experience frequent calamities such as earthquakes, heavy floods and. Some of these countries include Japan, China, Indonesia and more.
What Is The Significance Of TMT Bars
Thermo Mechanically Treated(TMT) Bars are commonly known as Reinforcing bars or Rebar. These high-strength reinforcement bars have a tough exterior and soft interior core. Since the creation of TMT bars, they have become highly favoured in construction projects. It has been proven that they are a highly viable option for strengthening concrete structures. It is primarily because of their ability to withstand compressive forces.
The creation of TMT bars is a process where steel bars go through constant heating and cooling to achieve high yield strength. TMT bars have become a staple in all construction projects. Mostly due to their robust build, appearance and strength with which they provide reinforcements to every concrete structure.
TMT bars also positively impacted the construction industry due to their resistance to seismic forces. During calamities like earthquakes, due to their inherent flexibility, they minimise the damage done by seismic activities and prevent property damage and loss of life. TMT bars have also achieved thermal resistance, making them the safest choice. The other properties of TMT steel bars, such as high yield strength, tensile strength, and ductility, are just some of the reasons why they stand apart from regular steel bars.
When the question arises of why TMT bars are significant, it is simply because they transformed the construction industry with their properties. They also facilitated the creation of much more complex yet safer construction projects.
How are TMT Bars Flexible?
TMT bars have to go through thermal processing in a steel plant. These steps include rolling through heat treatment and water quenching in the steel rolling mills.
When the quenching takes place, the hot rolled bar is cooled in a quenching box within a controlled environment. The water only cools the bar’s surface to ensure that the hot rolled bars’ core retains heat. Then the process of self-tempering begins by adding heat to the surface. The outer layer then hardens and transforms into martensite, resistant to stress and pressure, while the inner core remains soft and austenitic. This process improves tensile strength and ductility and allows elongation to withstand high stress in structures such as flyovers, dams and more.
When the bar passes the final stage, it goes through cooling beds, where the inner layer of the bar converts into a ferrite-pearlite-crystal structure. This microstructure arrangement in the TMT bar ensures that all the properties are incorporated.
Assessing The Flexibility of TMT bars
Commonly known as the Bending and re-bending Test, this test determines the flexibility of steel bars. In this test, TMT bars are bent to 135 degrees and immersed in boiling water for approximately 30 minutes. After the time elapsed, the bar re-bent to around 158 degrees. The test ensures that the TMT bars can bend to such degrees without any surface cracks along the bends.
Find the best TMT Bar Rolling Mill
We at the Steefo group understand the importance of TMT bars and their role in the steel and construction industry; therefore, we are the number one producer of TMT bar rolling mills. These TMT bar rolling mills are a part of Steefo’s DNA. We are the creators of ultra-modern, integrated automation solutions developed to increase productivity and decrease workforce requirements, guaranteeing a faster return on investment.
You can also check with our consultants to understand TMT rolling mill project costs! We would be happy to help!