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CRS bars Corrosion resistant steel

Pulkit was the first company to manufacture corrosion resistant steel TMT bars in South Indian. These are produced using a judicious selection of corrosion resistant elements, complemented by a special Thermo-Mechanical Treatment. Copper plug pores in rust. Phosphorus acts as an inhibitor as PO. The oxide layer formed is dense, with few pores/cracks which reduces the ingress of oxygen, sulphur dioxide, chloride etc.., through the oxide-metal interface. Resistance to pitting is improved by the chromium content. The microstructure resulting from the TMT process leads the higher corrosion resistance compared to regular TMT bars.

Corrosion Resistant Steel (CRS) is an inherent need of concrete structures that are exposed to humidity, coastal breeze, seawater, subsoil, brackish water and gaseous emissions in individual set-ups. These environments, corrosion sets in and destroys buildings slowly and hence the need for CRS arises, While several methods of fighting corrosion have been techincally developed, the only practical soultion is cost-effective steel, the composition of which is controlled to impart intrinsicallly improved corrosion resistance properties.

This reduces the rate of corrosion from the time of construction, allowing for longevity of the building structure.

Pulkit CRS Advantage

  • Longer life due to superior pitting resistance
  • High yield strength coupled with good ductility and bendability
  • No extra precaution required in material handling and transportation and no maintenance during fabricaition
  • No extra precaution required during welding, makinig it more suitable to poor onsiteworking conditions
  • Can be bent and re-bent around very small mandrels
  • Suitable for applications in seismic zones
Constituents Chemical composition (percentage max)
Fe-500 Fe-500D Fe-550 Fe-550D
bis pulkit bis pulkit bis pulkit bis pulkit
Carbon 0.30 0.25 0.25 0.20 0.30 0.25 0.25 0.20
Manganese NS 0.60 NS 0.60 NS 0.70 NS 0.80
Sulphur 0.055 0.050 0.040 0.055 0.055 0.050 0.04 0.040
Phosporus 0.055 0.050 0.040 0.050 0.050 0.050 0.04 0.040
Sulphur & Phosporus 0.105 0.100 0.075 0.075 0.100 0.095 0.075 0.075
Mandrel Diameter for Bend Test
Nominal size(mm) madrel diameter for different grades
Fe-500 Fe-500D Fe-550 Fe-550D
bis pmpl bis pmpl bis pmpl bis pmpl
Up to and including 20 4 ϕ 3 ϕ 3 ϕ 3 ϕ 5 ϕ 3 ϕ 4 ϕ 4 ϕ
Over 20 5 ϕ 3 ϕ 4 ϕ 3 ϕ 6 ϕ 4 ϕ 5 ϕ 4 ϕ

Where " " is the nominal size of the test piece, in mm.

The Diameter of the shall be given as below: (For Rebend Test)
Nominal size of specimen Diameter of Mandrel
Fe-500 Fe-500D Fe-550 & Fe 600 Fe-550D
bis pmpl bis pmpl bis pmpl bis pmpl
Up to and including 10 mm 5 ϕ 4 ϕ 4 ϕ 4 ϕ 7 ϕ 5 ϕ 6 ϕ 5 ϕ
Over 10 mm 7 ϕ 4 ϕ 6 ϕ 4 ϕ 8 ϕ 5 ϕ 7 ϕ 5 ϕ

Where " " is the nominal size of the test piece, in mm.

Typical composition of Pulkit CRS TMT (max)
0.15 % 1.0 0.04 0.1 0.45 0.8 0.32