TMT stands for the thermo-mechanical treatment of bars. TMT rod or TMT bar manufacturing is a medium or large scale operation. It is a highly profitable business depending on the manufacturing technology you are using. In this article, we intend to explore how to start a rolling mill business or TMT bar manufacturing business.
You can categorise TMT bars as new-generation-high-strength steel having superior properties such as weldability, strength, and ductility and bendability meeting highest quality standards at international level. Under thermo-mechanical treatment of bars, the steel bars are made to pass through a specially designed water-cooling system where these are kept for such a period that outer surface of bars becomes colder while the core remains hot. This creates a temperature gradient in the bars. When the bars come out of the cooling system, the heat flows from the core to the outer surface causing further tempering of steel bars thereby helps them in attaining higher yield strength of steel. TMT steel bar is a newer variety of steel for construction purpose.
WHY TMT BAR MANUFACTURING IS PROFITABLE BUSINESS?
Some of the better quality issues have made TMT bars more popular in the construction industry. These are better ductility and malleability, high yield strength and toughness, more bonding strength, earthquake resistance, corrosion resistance, high thermal resistance, economical and safe in use You will find no loss in strength at welded joints and ordinary electrodes welding for the joints. Currently, there demand in the market and capacities are increasing continuously. China is currently the world’s largest producer of crude steel before Japan, and the US. We can expect the steel production growth to reach 200 million tonnes by 2020 as compared to 71 million tonnes recorded last year
REGISTRATION & LICENSE REQUIRED FOR TMT BAR MANUFACTURING
This type of manufacturing operation attracts many different types of registration and licenses from the different Govt. agency. Sometimes it differs according to the form of organization and investment raised by the manufacturing company. It is advisable to check your state laws and consult with a right person before taking the initiative. Here, we have listed some of the general criteria.
- Registration of the firm with CAC. According to the management pattern and investment ratio, choose the right form of business organization.
- Obtain Trade License from the local authority.
- Apply for Pollution Control Board
- Apply for VAT Registration
TMT BAR MANUFACTURING PLANT SETUP & MACHINERY
Generally, you can establish TMT bar manufacturing plant as fully automatic manner. Depending upon the manufacturing technology and desired output, you must procure the rolling mill machinery. You may produce other ancillary products like I-beams, joists, hexagonal, channels, strips etc. from the same unit. Some of the common machinery are Roughing Mill, Intermediate Mill 3.Stand, Intermediate Mill 4.Stand, Conti. Finishing Mill 4.Stand, Rotary Dividing Fly Shear With Pinch Roll, TMT System for High Strength Bar, Twin Channel, Cooling Bed, Re-Heating Furnace, CNC Notching & Roll Branding Machine, Cranes, Air Oil & Water Pipe Line, Workshop Machinery and Testing Equipment.
TMT BAR MANUFACTURING PROCESS & RAW MATERIALS
8 mm 10 mm 12 mm 16 mm 20 mm 25 mm 32 mm 40 mm TMT bars have the maximum demand in the market. You must produce the materials in accordance with IS: 1786 – 2008, in Fe 415, Fe 500, Fe 415D, Fe 500D and Fe 550 grades.
First of all, you must design the reinforcement bar rolling for the production of the assured quality product only. The mill will have sequence mix of Roughing, Intermediate and Continuous Mills for quality measurements. Because of this a progressive reduction process, you can produce the bars with uniform size and mechanical properties all along the length of the product.
The TMT bars are then subjected to heat treatment in three successive stages, through International Process. In the first stage, Quenching starts with the hot roll bar leaving the final stand and immediately being quenched by a special Water Spraying System. The process results in the formation of “Martensite” in the outer surface of the bar while the core remains austenitic. In
In the next step, the bar leaves the water quenching line and is exposed to air. The heat flux from the still hot core reheats the outer surface within the structure. The Martensite formed in the first stage is thus subject to self- tempering giving a structure called “Tempered Martensite” which is strong and tough. The core 15. 15 is still austenitic at this stage.
The third and final stage of “Atmospheric cooling” takes place on the cooling bed, where the austenitic core is transformed to the ferrite-pearlite ductile core.
The final structure, thus, consists of a combination of a strong outer layer of tempered martensite and a ductile core of ferrite-pearlite. The rebar shall be produced in the range of 8 mm to 40 mm diameter.
The raw materials required for the production of proposed products are MS Ingots and Billets.
Steel plays an important role in the development of mankind in the nation. Today, it is difficult to imagine the world without steel. Steel has become vital to our everyday life. It is at the root of the quality of life that each of us enjoys today, helping to shelter us, to feed us and to facilitate both our working day and leisure activities. In addition, we depend on steel for almost everything from our houses and buildings, the cars we drive, roads, bridges, agricultural equipment, machines, the list is endless. With a huge expanding domestic and export market for steel, TMT bar manufacturing is definitely a lucrative opportunity for the entrepreneurs.