CRS RE-BARS

CORROSION:
Corrosion is an enemy of steel and concrete building structures. This is a natural phenomenon and can not be stopped. It causes detoriation of R.C.C. Structures and creates economical loss to every one in the universe.

Reason for Corrosion:
1. Wherever there is humidity corrosion sets steadily and destroys damaging houses, bridges and any construction that same used with ordinary steel.
2. Corrosion of the reinforcement bars occurs when neutralization takes place with atmospheric carbon dioxide.
3. When Chlorides from outsides reaches steel conversion of iron to iron oxide and carbon dioxide, which leads to corrosion.
4. Diffusing pollutants chlorides carbon dioxide or Sulphur dioxide
5. PH value of water used for concrete was less than 8.50%. The oxygen in air in presence of moisture starts attacking the surface of reinforced bars.

Corrosion Resistance:
After conducting various researches for fighting corrosion, we identified the cost effective steel with a composition that enhances corrosion resistance properties, reducing the rate of corrosion.

Technical Data
Standard sizes and useful Data
Dia (mm)	Area (cm2)	Range of weight (kg / meter)		Nominal Length (Meter per MT Approx)
Dia (mm)	Area (cm2)	Minimum	Maximum	Nominal Length (Meter per MT Approx)
6	0.28	0.206	0.222	4500
8	0.51	0.381	0.400	2500
10	0.76	0.581	0.600	1670
12	1.11	0.854	0.872	1150
16	1.95	1.500	1.530	650
20	3.07	2.393	2.410	415
25	4.90	3.750	3.850	260

Chemical Composition
Elements	Min %	Max %
CARBON	0.18	0.22
MANGANESE	0.45	0.55
SULPHUR	0.030	0.050
PHOSPHOROUS	0.040	0.070
CHROMIUM	0.25	0.40
COPPER	0.30	0.40
SILICON	0.15	0.25

MECHANICAL PROPERTIES
Property	Fe-415	Fe-500
Yield or 0.2% Proof Strength	415 N/mm2	500 N/mm2
Ultimate Tensile Strength	Minimum 10% above measured yield or proof strength, however not less than 485 N/mm2	Minimum 8% above measured yield or proof strength, however not less than 545 N/mm2
Elongation (Gauge length 5d)	14.5 % min	12 % min
Bend Test	Satisfies bend test around a mandrel (thro 180) of 3d for dia upto and including 22mm and 4d for over 22mm dia	Satisfies bend test around a mandrel (thro 180) of 4D for dia upto and including 22mm and 5D for over 22mm dia.
re bend Test	Satisfies Re-bend test around a mandrel of 5d for dia upto and including 10mm and 7d for over 10mm dia through 45″ bend and 22.5″ reverse bend

CRS PROCESS :
1. Copper addition : Addition of copper will plug the pores in the rust.
2. Chromium addition : By adding Chromium (Cr) in to steel, increases the passivity of anions. Another advantage is we are making the steel slightly Ferrite thus pitting resistance is increased. Chromium also increases the passivity and will form an invisible layer.
3. Phosphorous : Phosphorous acts as inhibitor. This will reduce the anodic reaction

Advantages :
CRS Bars reduces the rate of corrosion from the time of construction and thus lengthening the life of structure.
CRS (TMT) Bars most suited for reinforcement concrete in salty area and coastal area.
For every one meter JR TMT CRS marking for easy identification.