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)

Minimum

Maximum

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.

iso9001
is-logo