www.sefindia.org

[inchak at tatasteel.com]

Dear Mr. Sunil Gandhi,
I try to answer the questions ratsed by you.

[A} How can it be tested as TMT in lab?

Ans:Sometimes it becomes necessary to determine if a particular rebar, or
lot, has undergone proper heat treatment or is only a mild steel deformed
bar. Because the two cannot be distinguished visually, the following lab
test may be used for purposes of identification. A small piece (about 12mm
long) can be cut and the transverse face lightly ground flat on
progressively finer emery papers upto ‘0’ size. The sample can be macro
etched with nital (5% nitric acid in alcohol) at ambient temperature for a
few seconds which should then reveal a darker annular region corresponding
to martensite/bainite microstructure and a lighter core region.

{B} It is seen that "TMT" marks are engraved on the bars at every 1metre
length. Is there any agency who approves such branding in India like Tor
Steel Research Foundation in India?
Ans: The only authority in India who is competent to permit branding on ANY
rebar is the Bureau of Indian Standards.Tor Steel Research Foundation is
only an advisory body.

{C} There is almost a difference of Rs.2000/- to 3000/- per tonne in price
of steel among various TMT bars manufactureres. How can one test as genuine
TMT bars on visual appearance?
Ans: There is no way to distinguish visually TMT vs Non TMT. The Macro etch
test is the only way. Or you have to go for a trusted source.










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