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Facts About TMT

TMT Bars – Important Facts

TMT bar are called TMT bars because they undergo a special process called Thermo Mechanical Treatment. TMT bars are specially treated high strength deformed steel bars. This makes it superior in quality and strength compared to ordinary steel bars.

Here are few important facts:
  1. The TMT bars obtain their strength from Thermo-Mechanical treatment they undergo. Under this process, ordinary steel bars are first subject to intense cooling (through quenching process in the Tempcore cooling system) just after they have come out of the rolling mill. The sudden quenching process reduces the temperature of the outer layer, thus, making it hard. However, the core remains hot. After further atmospheric cooling, it tempers. This makes the TMT bar ductile, super tough and gives high strength.
  2. In ordinary bars, the excessive presence of carbon affects its weldability. However, this problem doesn’t exist in TMT bars. The carbon content in TMT bars is low, thus, improving its ductility. It is usually restricted to 0.3% BY BIS ( IS:1786) to give the bars superior weldability without affecting their quality and strength. The joints of the TMT bars can be easily welded using ordinary electrodes.
  3. TMT bars not only have better ductility and malleability, but these bars are also an earthquake, thermal, and corrosion-resistant. These bars do not lose strength at their welded joints and are safe to use for any kind of construction work.
  4. TMT bars are one of the most important materials to construct earthquake-resistant structures. The ribbed TMT bars made by the best Manufacturers add better reinforcement to any concrete structure, thus, minimizes the chance of damages during any seismic activities.
  5. The actual strength of a TMT bar lies in the optimum balance between Toughness and Elongation or Flexibility.
  6. When it comes to selecting the right building materials, choosing the Best TMT bars are one of the most important factors.
  7. TMT bars are been used in all high-tech constructional projects with the latest technological process and come with high strength.
  8. Nowadays high ductility bars are being produced in the number of grades like Fe: 415, Fe: 500 and Fe: 550. It's being used in the construction of big buildings, bridges, various plants, Concrete Structural bases etc.
  9. The high tech & new edge TMT bars are made earthquake resistant. It can be used in all types of construction projects for its extremely bending ability. This can be broadened to match up exactly the way you want it to be for your constructional structure.
  10. TMT bars are made corrosion-resistant, rust-resistant and these bars are must use in the coastal and humid tract. It intensifies the durability for a longer period.
  11. TMT Bars are also fire/heat defiant, and it helps to prevent any hazard (natural or man-made).
  12. The manufacturing process of a TMT bar saves up to 20% of the steel than the usual. Automatically the production cost becomes much lower.
  13. TMT Bars made from integrated steel plants are the best because of better quality control of the entire process. 

Why Supershakti is better?

Supershatki brand is manufactured in an integrated steel plant by using state of an art facility all under one roof for best quality control.

  • Ironmaking (conversion of ore to liquid iron/ iron ore -> sponge iron -> liquid steel).
  •  Steelmaking (conversion of pig iron to liquid iron).
  • Casting (solidification of liquid steel)
  • Roughing rolling/ billet rolling (reducing the size of blocks) Product rolling (finished shapes)
  • In Supershakti the control procedure is based on the Yield Strength/Tempering temperature relationship obtained from the results of the TMT bar.
  • In Supershakti the variation of the thickness of “Martensite Layer” is versus the yield strength is clearly shown.
  • The cooling power of the Supershakti quenching line is always adjusting in order to obtain the value required for the yield strength (YS from grade + safety margin).
  • In Supershakti, during manufacturing the cooling power of the bar is longitudinally tracked by the pyrometers. The pyrometers are the heart of the control of the process for achieving yield strength.
  • In our process the pyrometer is located at the entry of the Tempcore box and measures the flow material variation of finishing temperature along with the billet or between successive billets to ensure the best and homogenous yield strength, end to end.

Our TMT bars are used for hundreds of mega projects in India and   West   Bengal as well. We are intimately involved in infrastructure development all across India. Projects like Bridges, Dams, Rails, Metro rails, Industries, Housing Projects, Defense Projects and Highways.

Our TMT bars are used for hundreds of mega projects in India and West Bengal as well.
We are intimately involved in infrastructure development all across India. Projects like Bridges, Dams, Rails, Metro rails, Industries, Housing Projects, Defense Projects, Airports and Highways.

Supershakti manufactures 550+SD and Fe600.  Choose the one that is right for you.

There are different grades of TMT bars accessible in the market in that major are Fe 415, Fe 500, Fe  550  and Fe 600 TMT grades. The grade represents the strength, quality and unbending nature of the bar, explicitly the yield quality of support. It is exceptionally important to pick the correct grade, depending upon the kind of structure. During the basic plan of the structure, the architect chooses the suitable dependent on material accessibility and cost contemplations.

Fe 550 grade

Fe 550 grade bars have greater tensile strength and can be used across a range of large-scale projects. Construction procurement managers can source Fe 550 grade TMT when developing industrial and large-format infrastructure projects.  Bridges, industrial projects, and structures requiring high load-bearing capacities can leverage Fe 550 grade TMT. They’re especially impactful in coastal, marine and underground environments as well.

 

Fe 600 grade

Fe 600 is one of the strongest TMT grades that construction firms can acquire while developing heavy-duty infrastructure projects, bridges, marine facilities, etc. They offer greater tensile strength, reduce overall consumption, and ensure lesser steel congestion within the reinforcement. Fe 600 may be used in the construction of expressways, metro projects, plants, towers, commercial properties, and industrial zones. They’re used extensively when large-scale projects need to be developed keeping load-bearing, durability, and corrosion resistance in mind.

 

(IS: 1786)

Grade Fe-550D

SuperShakti Fe550+SD

Grade Fe-600

SuperShakti Fe600

Mechanical Properties

(IS: 1786)

 

(IS: 1786)

 

Yield strength

550 Mpa (min)

550-600

600 Mpa (min)

600-660

Tensile strength (N/mm2)

600 Mpa (min)

600-670

660 Mpa (min)

660-730

Elongation

14.5%(min)

14.5-21.5%

10%

12.5-15.0%

Chemical Properties

 

 

 

 

Carbon

0.25 Max

.20 Max

0.30 Max

0.22 Max

Sulphur

0.040 Max

0.040 Max

0.040 Max

0.032 Max

Phosphorous

0.040 Max

0.040 Max

0.040 Max

0.036 Max

S+P

0.075 Max

0.075 Max

0.075 Max

0.069 Max

 

BIS Tolerance

 

 

 

Nominal size (mm)

nominal section wt.

section wt range

SuperShakti Fe550D

section wt.

SuperShakti Fe600

section wt.

6

0.222

[ 0.206-0.237 ]

[ 0.210-0.225 ]

 

8

0.395

[ 0.367-0.423 ]

[ 0.370-0.385 ]

[ 0.370-0.385 ]

10

0.617

[ 0.574-0.660 ]

[ 0.575-0.590 ]

[ 0.575-0.590 ]

12

0.888

[ 0.844-0.932 ]

[ 0.845-0.860 ]

[ 0.845-0.860 ]

16

1.58

[ 1.501-1.659 ]

[ 1.510-1.550 ]

[ 1.510-1.550 ]

20

2.47

[ 2.396-2.544 ]

[ 2.400-2.450 ]

[ 2.400-2.450 ]

25

3.858

[ 3.735-3.966 ]

[ 3.750-3.810 ]

[ 3.750-3.810 ]

28

4.83

[ 4.685-4.975 ]

 

[ 4.685-4.820 ]

32

6.31

[ 6.121-6.499 ]

[ 6.150-6.310 ]

[ 6.150-6.310 ]