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Frequently Asked Questions

Q:What are the most common rebar sizes?

A:The most common sizes of rebar are #3, #4, #5 and #6 rebars which are used in residential and light commercial construction, as well as, commercial construction.

Q:What is grade in rebar?

A:Grade define the yield strength, ultimate tensile strength, chemical composition, and percentage of elongation. Rebars are typically manufactured in grades 40, 60, and 75.

Q:What is Tonne (T)?

A:Metric tonne, equivalent to 1,000 kilograms or 2,204.6 pounds.

TMT

Q:What are TMT bars?

A:TMT means "Thermo Mechanical Treatment" .By this process higher yield strength of bar is obtained. The Steel bars are immediately intensively cooled down after rolling. With the sudden reduction in temperature the surface layer harden up while the internal core is still hot. Further cooling of the bar in normal temperature heat form the core causes TEMPERING.

Q:What raw materials are used for the production of TMT Bars?

A:TMT bars are manufactured by using cheap and substandard recycled metal. The scrap is not thoroughly refined to have pure Iron, many other metals and impurities are left to be supper-heated to form a melt and hence casted into bars.

Q:Why TMT Bars are selling as ASTM Deformed Bars in the Market?

A:TMT bars are same in appearance as ASTM Deformed bars and it is not easy to differentiate unless chemical analysis is done. TMT Bars has low cost of production .To obtain better profit margin, TMT Bars were invented.

Q:Why TMT Bars fail in Chemical Properties of ASTM A615 Standard?

A:Mostly TMT bars are rolled with cheap and substandard scraps for the low cost of production. This treatment is focused to increase only physical properties of yield strength. This process fails to maintain the ratio (gap of 30000psi) in between yield strength and tensile strength as defined is ASTM A615 and causes failure of the bar. TMT bars also fails in bend testing due to high tempering. Above all, it is proved that TMT Bars fail 100% in chemical properties defined in ASTM standard.There is also a great variation in physical apearance of bars from same lot.