What Are The Important Stages Of Manufacturing Tmt Bars?

 

Thermo Mechanically Treated bars or TMT bars are easily the best things that have happened to the construction world. Goyal group is one of the most important TMT bar suppliers in Assam and West Bengal.  When compared to other types of steel bars these are more affordable, extremely durable, and also exhibit more ductility in comparison. These steel bars have anti-corrosive properties and better strength owing to the special kind of thermomechanical processing. The manufacture of TMT Steel bars includes three important stages

Materials Sourcing and Processing

High-quality recycled steel scrap is collected and stocked. Next these materials are processed with the help of either an Electric Arc Furnace (EAF) or Basic Oxygen Furnace (BOS), or sometimes even the more sophisticated Induction Furnace that can carefully fine-tune the steel composition. Based on the steel composition that is desired this method can remove or add some chemicals from or to the metal. Various processes that can be used for this include CAS-OB, Degassing, Stirring, Ladle Furnace, and Ladle Injection.

Manufacturing Steel Billets

Next comes the continuous casting process that is used for finally casting the steel into billets. In this method, steel in molten form is poured into molds. Then, these transform the metal into rectangular and long forms known as steel billets. These billets in turn are transformed into TMT bars.

TMT reinforcement bar Manufacturing from Steel Billets

This happens to be the ultimate stage of the manufacturing process, used for the production of TMT steel bars. The heated billets undergo 3 stands in a reduction mill such as roughing stands, intermediate stands, and finishing stands. In the last stage which is the finishing stands, the total length of the bars is extended and the thickness is reduced by the rolling mill.

After the hot rolled bar comes out of the finishing stand, it is passed through a stage in which sprays of water lead to cooling and fast hardening of the rebar surface. Although this fast cooling process hardens the surface, it allows the inner core to be malleable and hot. At the end of the quenching stage, the inner core stays hot. It keeps passing the heat onto the external surface. This method is termed as ‘Self-tempering” and transforms the external surface to Tempered Martensite.

Finishing stage

Finally, the bars are taken off the special cooling beds, to get them cooled down completely. This gradually cools down the hot core to room temperature. Then the bars are weighed, tested, packed, and finally shipped to the destinations to be delivered at. The TMT bars manufactured by the Goyal group achieve their properties by online computerised controlled thermo processing. This is what makes them unique and Goyal group the main TMT bars suppliers in Assam and WestBengal.