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Primary or Secondary

There are two types of TMT bars: primary and secondary. Primary bars are made from iron billets in a blast furnace, while secondary bars use scrap steel in an electric arc furnace. There is little difference in strength and flexibility between the two. Secondary bars are cheaper. TMT bars come in many Indian brands and are manufactured to Indian Standards. They should be produced using ladle refining to reduce impurities. TMT bars are available in different diameters and grades depending on needs, and the most common grade is FE 500D.

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1K views2 pages

Primary or Secondary

There are two types of TMT bars: primary and secondary. Primary bars are made from iron billets in a blast furnace, while secondary bars use scrap steel in an electric arc furnace. There is little difference in strength and flexibility between the two. Secondary bars are cheaper. TMT bars come in many Indian brands and are manufactured to Indian Standards. They should be produced using ladle refining to reduce impurities. TMT bars are available in different diameters and grades depending on needs, and the most common grade is FE 500D.

Uploaded by

Rahul Srivastava
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Primary or Secondary 

There are two types of TMT bars – Primary and Secondary.

Primary TMT bars are produced using iron billets usually from a blast
furnace.

Secondary TMT bars use scrap steel or recycled steel is used in an


electric arc furnace for steelmaking. 

There is not much difference between primary steel TMT bars and
secondary TMT steel bars based on strength and flexibility and both
pass physical and chemical tests. Secondary steel TMT bars are much
cheaper than their counterparts. Cold twisted deformed bars are also
produced by high speed rolling and precision cold twisting and offer high
strength and stress resistance.

Brand and Certification


There are many Indian TMT brands including Tata, Jindal Panther, Sail,
Kamdhenu, SAIL and Vizag CRM, SRMB, JSW and Shyam. TMT stands
for ‘Thermo Mechanical Treatment’ and is manufactured under Indian
Standards (IS).

The TMT bars should be produced using the Ladle Refining Furnace (LRF)
route to reduce impurities which include Sulphur and Phosphorus in iron
ore. Both BF-BOF-LRF or “integrated iron ore-IF-LRF” manufacturing
processes can make best quality BIS mark TMT bars. TMT bars are
certified with BIS and IMS (Integrated Management System) certifications. 

Size

TMT bars are manufactured in different diameters according to the need.


The standard length of most of the branded TMT bars are 12 meters or 40
feet. For ‘U’ bend bars, the length varies from 18–20 feet. TMT bars are
commonly available in 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm
and 36mm.

Grade

There are many TMT bar grades like Fe-415, Fe-500, Fe-550, and Fe-
600 produced by Indian TMT bars manufacturers. FE 500 & FE 500D TMT
Bars are mostly used in construction, especially in railway and civil
applications.

FE 500D is the most preferred TMT Bar where ‘Fe’ is used scientifically to
denote iron, ‘500’ implies the minimum yield stress in MPa and D stands for
‘elongation’. A building in an earthquake-prone zone might need higher
grade TMT bars as per IS 13920 BIS. Ductile and Super ductile variants
are also available in the market depending on the project specifications.

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