Step 1: Reheating Furnace

The TMT manufacturing process starts with reheating the furnace. The steel billets, which are at room temperature of about 20 to 30 degree celsius, are reheated at the temperature ranging from 1050 degree celsius to 1150 degree celsius. Reheating the billets to this temperature will soften it so that it can be transformed to desired length and thickness. The billets are heated on all the sides to ensure efficiency and effectiveness.

Step 2: Rolling

After the billets are reheated, it goes through the process of rolling. This process is carried out to reduce the size of the millet bars to desired diameters. Rolling mills at Hama steel are able to produce TMT bars of various sizes according to the needs of the customers. To ensure quality and produce high-quality steel bars, Hama Steel has been investing a lot in technology.

Step 3: Quenching and Tempering

The rolled billets are then taken for quenching and tempering. This process is carried out to give the steel billets their desired property. The steel bars produced through quenching and tempering are known as reinforcement bars

During this process, we make sure that the bars spend an equal amount of time in the quenching chamber. Then, the cumming bars are sprayed with water, which changes the temperature of the outer layer of the bar. The temperature changes from 900 degree centigrade to 280 degree centigrade. However, the temperature of the inner layer will remain consistent, i.e. 900 degree centigrade.

Because of these different temperatures, the outer layer will remain hard and the inner layer will remain softer. The outer layer is known as Tempered Martensite, while the inner layer is known as Ferrite Pearlite. 

Here are some of the advantages of reinforcement bars:

  • Consistent Quality 
  • High Ductility
  • Simple and Easy Fabrication 
  • Highly Strong

Step 4: Flying Sheer

Finally, a computer controlled flying sheer is used to cut the TMT bar. This is done in order to ensure all the edges of the bars are smooth and eliminate sharp edges, if any.  After the edges are cut with flying sheer, the tail breaker is used to slow the speed of the bar. Then the bar is taken to the cooling bed using a twin channel arrangement controlled by PLC. There is a twin channel arrangement which is PLC controlled and guides the bar onto a cooling bed.  This PLC controlled twin channel arrangement gives perfect rib geometry for superior strength and better bond strength.