The TMT in TMT Bars stand for Thermo-Mechanically Treated, it is a process of rapidly cooling down bars in the molten state. This cooling down process is either done spraying water at regular intervals. This regular interval will further define the characteristics of the bars. This interval of quenching of bars will give rise to different grades of TMT bars in fact. The goal here is to have a solid and hard outer surface with a pliable inner core. This outer shell is coated with a protective film, making them resistant to corrosion and rust, making them apt for constructing sensitive structures such as high rise residential buildings and bridges in humid areas. TMT bars and different Steel Grades.
For starters, TMT bars are superior to conventional TOR steel bars. TMT bar grades are given grades according to their strength and rigidity.
The grades are
- Fe 415
- Fe 500
- Fe 550
- Fe 600
The higher grade, those TMT bars can be used for structures which require industrial grade strength. The higher the grade, the lessor the bendability so it is important to use them in structures where those things are not of importance. If Fe 600 is for industrial use, then Fe 415 is homes and residential structures. In the same way, Fe 500 and Fe 550 are versatile bars who can be used for building multiple structures such as bridges and underground structures.
Uses In Detail
Fe – 415: Due to its higher uniform elongation, it is the choice of TMT bars for the common homeowner. This higher elongation makes them perfect for building structures in earthquake-prone areas. With the added advantage of anti-resistant coating, they are resistant to corrosion and rust as well.
Fe – 500: A TMT bar which is known for its diverse usages, they have been used in bridges, multiple story commercial structures and underground structures. They are popularly used in coastal areas due to their anti-corrosion resistant properties.
Fe – 550: a Little bit better than Fe 550, they are used where the scale of the project is slightly bigger for Fe 500 to handle.
Fe – 600: Made for structures which require strength and toughness, this TMT bars is known for its high tensile strength more than anything else.