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RAJURI 500D
 Why RAJURI 500D Rebar? :
 
  • RAJURI 500D is uniquely made to be stronger, more bendable and has higher thermal stability.
  • More efficiency for seismic and fatigue loads, RAJURI 500D overall cost effective cause no future repairs which occurs due to low quality steel.
  • In RAJURI 500D more safety and security due to its unique metallic chemical compositions.
  • The use of 500D bars results in 15-20% in steel consumption due to confirm values in physical properties as per IS build trust amongst community of Structural Designers and Engineers.
  • RAJURI 500D ensures greater safety due to high elongation values of 18-25%
  • Globalization has brought awareness about quality of construction steel. 
  • RAJURI 500D fulfills international quality norms.
 
 Some International Standards :
 
  • German BS1500 of DIN488
  • British GR450 of BI15444
  • Swiss Topar 500 of SIA 162
  • French FeB50 of NF-A35-016 etc.
 
 Some International Standards :
 
RAJURI 500D can be used at lesser mandrel diameters so it is preferable in complicated sections at joints of beams and columns.

Any rebar necessarily contains two harmful impurities Sulphur (S) & Phosphorus (P) in varying levels which affect certain properties of steel like fatigue, impact strength and corrosion resistance etc. A superior and controlled steel making practice can reduce the levels of these impurities. In the last revision of Indian Standard of Rebars (BIS) in 2008, this aspect has been factored in and a new superior category of rebar called “D” has been introduced in the (BIS) the step is in the direction of improving overall steel quality of Indian steel producers. In view of this development, RAJURI steel has introduced a new grade called RAJURI 500D where the combined level of Sulphur and Phosphorus is restricted to maximum of 0.075% to comply with the latest BIS specifications.

As mentioned in the beginning, Sulphur & Phosphorus (S & P) are harmful impurities in steel. High levels of phosphorus can lead to cold shortness in steel where the steel tends to become very brittle under extreme cold conditions and thus vulnerable to cracking. High level of Sulphur can lead to hot shortness in steel, a condition in which the melting point of steel gets lowered thereby reducing its strength dramatically under high temperature conditions.

However, lower levels of S & P can be achieved only through advanced steel making technology. Such low S & P levels, as specified in the 500D specifications of BIS, are
almost impossible to be -fied in the 500D specifications of BIS, are almost impossible to be achieved through normal scrap & induction furnace route. At RAJURI Steel due to state-of-the-art making facilities as well as the stringent quality control at every step of manufacturing. 

However, lower levels of S & P can be achieved only through advanced steel making technology. Such low S & P levels, as specified in the 500D specifications of BIS, are almost impossible to be -fied in the 500D specifications of BIS, are almost impossible to be achieved through normal scrap & induction furnace route. At RAJURI Steel due to state-of-the-art making facilities as well as the stringent quality control at every step of manufacturing. 

 
 The comparative properties of ordinary 500 grade vis-à-vis 500D grade are give below :
 
Chemical Properties
 
Properties
BIS Specification
Typical Values of
RAJURI 500D*
Fe 500
Fe 500D
% Carbon
0.300
0.250
0.25 max
% Carbon Equivalent (CE)
0.420
0.420
0.40 max
% Sulphur (S)
0.055
0.040
0.035 max
% Phosphorus (P)
0.055
0.075
0.035 max
% Sulphur & Phosphorus
0.105
0.075
0.070 max
Nitrogen (ppm)
120
120
120 max
 
Mechanical Properties (Min)
 
Properties
BIS Specification
Typical Values of
RAJURI 500D*
Fe 500
Fe 500D
Yield Stress –YS (N/mm2)
500
500
540 min
% Elongation
12.0
16.0
18 min
Ultimate Tensile Stress-UTS (N/mm2)
545
565
600 min
UTS / YS Ratio
1.08
1.10
1.12 min
 
as obtained in 90% of the Heat
 
 Modern Concept: LCV (Life Cycle Value) :
 
Instead of calculating just current cost only, calculate NPV (Net Present Value) of all future costs and the total life expected of it.  Over a period of time, LCV is the true measure of the value of the material.  In the long run, RAJURI 500D will provide a structure that is more cost effective, stronger, safer and maintenance free.
 
 Applications :
 
Bridges Auditoriums Dams
     
High Rise Buildings Flyovers Industrial Buildings
     
Concrete Road Power Plants Other General Structures

 
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