(An ISO 9001:2008 certified Company) Trust Your Self . . . . Trust GTB..



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Welcome to GTB

GTB STEEL CORPORATION (PVT) LTD is an Indo-Sri Lankan BOI Joint Venture. The promoters of GTB have over 60 years of versatile experience in steel industries. GTB are a Licensee of TOR-Isteg Steel Corporation, Luxembourg and TOR Steel Research Foundation of India.


The Product GTB TMT Steel Bars are available in sizes of 08, 10, 12, 16, 20, 25, 32 and 40mm diameter, having high Yield Strength in conjunction with excellent Ductility.

GTB TMT (Thermo Mechanically Treated) Bars were manufactured first time in Sri Lanka in a most modern and sophisticated Rolling Mill having Quality Management System Certified to ISO 9001:2008 & SLS 375:2009 Standards.


Quality & Strength GTB TMT Bars consist not only of high strength, but also deformation ability, superior bendability, easy weldability and excellent bond-strength. TMT Bars are manufactured from imported raw materials conforming to International Standards and Specifications to ensure the highest standards of quality conforming to the strictest specifications, as per BS 4449:2005 and SLS 375: 2009 Grade 500 Standards.


Result of Advanced Technology

Advance technology from Thermex, Germany, is used for the first time in Sri Lanka, to produce GTB® TMT 500. Thermex process imparts high strength to the bar using thermo mechanical treatment of bars as against cold twisting, which is used to manufacture traditional reinforcement bars.

Purest Billets

GTB Steel Corporation sources finest steel billets manufactured by prime mills using best raw material in state of the art facilities like Blast Furnace, Ladle Refining with Continuous Billet Casters. All harmful residuals and tramp elements are eliminated during the processing and pure billets are cast assuring consistent quality of GTB® TMT 500.

Excellent Bendability

The controlled process of Thermex TMT Technology ensures stronger outer-shell and soft core of GTB® TMT 500 resulting in excellent values of bendability. The bar can be bent around mandrels much smaller than those specified in SLS 375:2009 & BS 4449:2005 Standards.

Higher Corrosion Resistance

Unlike the CTD process, the dry Ferrous Oxide layer remains intact during the TMT manufacturing process. The oxide layer acts as a barrier to atmospheric oxygen and prevents further oxidation. In contrast to TOR steel, TMT bars free of surface residual stresses making it more resistant to corrosion.

Higher Tensile Strength of GTB® TMT 500

Yield point of not less than 500 gives Structural Engineers an opportunity to design RCC structures using 8% lower quantity of steel without sacrificing their strength.

Superior Weldability

GTB® TMT 500 is produced from low carbon and carbon equivalent billets to ensure superior weldability.

Higher Bond Strength

Rib pattern of GTB® TMT 500 is specially created using automated CNC machines, resulting in precisely uniform rib profile through-out the length of the bars ensuring excellent bond strength between steel and concrete.
While the specifications stipulate that bond strength should be 40% higher than that of Mild Steel Plain Bars, GTB® TMT 500 Bar has typical values which are higher by as much as 100%. This leads to increased safety and durability of the structure even in the most hazardous environment.

An ISO 9001:2008 Certified Company