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Mill Details

‘Rajuri Steel’ recently completed the mill upgradation by introduction of Licensed ‘THERMEX COOLING TECHNOLOGY’ of HSE, Germany. HSE Thermex system has been successfully employed to produce bars of all International Standards such as-

  • German BSt500 of DIN488
  • British Gr.450 of BIS 444-1978
  • Swiss Topar 500 s of SIA 162
  • French Fe B50 of NF-A35-016, etc.
  

 
WHT TMT REBARS?

• Rajuri Thermex TMT500 ensure greater safety due to very high elongation values of 16-25%.
• The use of high strength Thermex TMT bars results in 15-20% in steel consumption and overall cost saving upto 10-15%.
• CTD rebars are not used in construction in advanced countries but are used extensively in India.
• Globalization has brought awareness about the deficiencies of CTD bars as the demand for TMT rebars is increasing globally.
• In most developed countries, rebars with Yield Strength of minimum500N/mm2 (as against 415 N/mm2 in CTD bars) are specified for RCC work.
• Rajuri steel is uniquely made to be stronger, more bendable, and has a higher thermal stability.
• More efficient for Seismic and/or Fatigue Loads.
• Overall cost effective.

 

 

WHY THERMEX TMT REBARS?

Rajuri steel chose the German ‘Thermex Cooling Technology’, as it is the globally preferred choice. They are among very few companies who are successful in producing right TMT rebars with proper specifications. The consumers of TMT rebars must ensure that they are using correct TMT rebars. This is essential today as many rolling mills in India are merely spraying water on the bars in an unscientific way and selling them as ‘TMT’ rebars. Their strength is even less then CTD bars. The process is simple and effective. It is ‘Worker Friendly’ due to its unique process and proprietary hardware. Thermex TMT rebars are preferred choice of civil and structural designers worldwide.

  
View of Platform during rainy season which clearly shows the difference between quality of CTD & TMT Bars.

 

THERMEX PROCESS

Directly after the last rolling mill stand, the steel bar recieves a short, intensive cooling as it passes through the THERMEX Water Cooling System. The reduction in temperature converts the surface layer of steel bar to a hardened structure. This phase of intensive cooling is followed by further cooling in atmosphere, so that the temperature between core (which is still hot) and the cooled surface layer is equalised and the surface layer gets tempered from the heat of the core. the resultant structure is a tempered Martensite zone at theperiphery & a fine grain ferrite-pearlite structure in the central zone. So the Rajuri Thermex rebars have all the desired properties without the need of costly alloying elements.

 

 



Indian Scenario

According to new amendment to IS 13920 : 1993 -
'High strength deformed steel bars, produced by the thermo-mechanical treatment process, of grades Fe 500 and Fe 550, having elongation more than 14.5 percent and conforming to other requirements of IS 1786:1985 may also be used for the reinforcement.'
Indian Life is as precious as that of persons in developed countries. So Rajuri Steel will mainly produce rebars of Gr.Fe500 (Thermex TMT) so that Indian customers also obtain full benefit as available to global users.
It is foreseen that the use of Thermex 500, conforming to Fe 500 but with far greater elongation values, will gradually replace the use of Fe 415. The stage is now set for the pattern in Germany (see Fig. 1) to be repeated in India. It is merely a question of time. Not only will CTD bars be phased out in the coming years, we shall also be witness to gradual and definite reduction in the use of Fe 415. We have missed out in the past 10-to15 years but shall definitely not fail a second time. We owe it to the nation.