Important Facts About Tmt

TMT bars are one of the most important construction materials that are widely used for structures. The true strength of TMT bar lies in the optimum balance between Toughness and Flexibility (Elongation)

TMT bars are further classified in to two variants:

  1. Fe 500
  2. Fe 550

Fe 500 is the chemical structure of TMT bars. It is the reinforcement steel rods (or bars) that can safely withstand a Yield Stress of 500 N/mm2 which is stronger than 415 N/mm2 by ~20%. The term “Fe” denotes Iron,”500” stands for the minimum yield stress in N/mm2 and the letter “D” denotes that such bars have higher values of ductility. Fe 550 denotes the different grades that are available.

Some of the key terms that are used in TMT are:

  1. Material – Fe stands for iron. The iron used in TMT bars could be from billets (Category A, good quality TMT) or through remelting of scrap steel (Category B / C)
  2. Length – Length of one bar is usually 9 mtr (40 feet)
  3. Weight – As an example, one bundle of 8 mm TMT weighs ~47 kgs and has 10 rods
  4. Strength – Fe 500 refers to stress bearing capacity of 500 N/m2. Hence, Fe 550 is stronger than Fe 500 and can take higher loads for the same amount of weight of the TMT bar
  5. Ductility – The D in Fe 500 D stands for Ductility. Fe 500 D is more flexible (does not break when bent) and has better weldability than Fe 500. D variety bars are very useful for high rise buildings, earthquake prone regions. They have lesser impurities*
  6. Ribs – Ribs ensure a strong grip between cement and TMT bars. The round, X, Y, Z, diamond ribs etc. help in the binding becoming stronger

Some of the key things to keep in mind while buying TMT are:

  1. Quality – Do not accept rusted material
  2. Weight – Weigh the material carefully and ensure that the rods are 40 feet in length

These are some of the tips to watch out for while choosing the right TMT for your Home/Structure. These will help to make sure the right kind of foundation is being laid for a long lasting association.

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