What is the TMT Bars Manufacturing Process?

 

Thermo-Mechanically Treated Bars, also known as TMT Bars, are steel bars produced through the thermo mechanical process that have a hard outer core and a soft core while maintaining their bendability. They adhere well to concrete and give it durability. As a result, they are frequently used to create reinforced concrete structures that are sturdy, durable, and somewhat earthquake-resistant.

The following are the various steps involved in producing TMT bars:

Iron ore, coking coal, and limestone are placed in the top portion of a blast furnace while hot air is blown at the bottom of the surface to ignite combustion. This process converts iron ore into iron. Pig iron, which is produced by burning iron ore, is free of many of the impurities found in iron ore. The limestone aids in purging the impurities from the iron and bringing the purified iron to the surface as slag.

2.Transforming iron into steel - The molten pig iron is now poured into a straightforward oxygen furnace using a ladle. Also comprising about 20% of this vessel is steel. High pressure oxygen is blown through a lance that is lowered into the vessel. Because of this, iron impurities burn when oxygen and carbon interact chemically. The limestone, which is a component of the mixture, aids in further purifying the iron because many impurities, including oxides, silicates, and phosphates, react with it and either form slag or escape through the top of the furnace as fumes. Slag is ready to be combined with other materials, transformed into various alloys, and cast into any shape once it has been removed from the molten steel. The steel produced by Madhav KRG Group is free of harmful impurities like phosphorus, sulphur, oxygen, nitrogen, and hydrogen thanks to the use of the renowned Ladle Refining Furnace (LRF) technology. With the aid of this technology, high-quality TMT bars can be produced from billets that have undergone complete ISI testing.

3.Rolling - The steel is then transferred to a Continuous Casting Machine (CCM) to produce billets.

4.Quenching - The thermomechanical treatment's first stage, quenching, now starts. A hard outer martensitic rim is produced on hot-rolled steel bars after they are quickly cooled with a water spray. The bar's austenitic core is still hot. The TMT bar is both strong and ductile thanks to these two layers.

The steel bars are then given the opportunity to "self-temper." The bar's core, which was unable to cool during quenching, is now allowed to transfer heat to the outer martensitic layer, "tempering" the bar and increasing its strength.

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The steel bars are then placed on a cooling bed and allowed to rest at room temperature. 6. Atmospheric cooling This enables the soft inner austenitic core to change into a ferrite-pearlite structure. As a result, the finished product has a ductile core and a hard order layer that is tough.