Shyam TMT Re-bars CRS are rolled from billets alloyed with corrosion-resistant elements (copper and chromium) and given controlled quenching and tempering. The brochure reports a minimum Corrosion Resistance Index of 1.7 and almost 70 % less corrosion than other TMT re-bars, with field testing at IIT Kanpur and National Test House, Kolkata.

Key features

• Copper and chromium alloyed corrosion-resistant steel
• Minimum Corrosion Resistance Index (CRI) of 1.7
• almost 70 % less corrosion than other TMT re-bars
• No additional precaution in handling, transportation, storage or working at site
• No maintenance during fabrication
• no extra precaution during welding
• Workable in poor site conditions
• Lifespan cost benefit

Applications

• Oil and gas exploration sites
• Bridges and dams
• Highways and flyovers
• Sea ports and jetties
• Thermal and hydel power stations
• Industrial structures
• Hazardous area constructions

Specifications

Grade: CRS (grade designation not printed) | Diameter Range: 8 mm - 40 mm | 0.2% Proof Stress (Min): 540 N/mm2 | Ultimate Tensile Strength (Min): 620 N/mm2 | Elongation (Min): 18 % | Bend Test: 3D to 4D | Rebend Test: 4D to 6D | Carbon (Max): 0.150 % | Manganese (Max): 1.500 % | Silicon (Max, as printed): 0.035 % | Phosphorus (Max): 0.100 % | Carbon Equivalent (Max): 0.500 % | CRE (Min): 0.500 % | Corrosion Resistance Index (CRI): Minimum 1.7 compared with other TMT re-bars; almost 70 % less corrosion than other TMT re-bars | CRI by Test (CRS vs non-CRS = 1.0): Potentio Dynamic 2.35; Salt Spray 1.59; Sulphur-Dioxide 1.68; Alternate Immersion 1.92 | Corrosion Tests: Alternate immersion, salt spray, atmospheric exposure, sulphur dioxide and potentio dynamic tests per ASTM standards | Alloying: Copper and chromium added to molten metal to make CRS billets; controlled quenching and tempering

Standards: IS 1786 | ASTM corrosion test methods (alternate immersion, salt spray, atmospheric exposure, SO2, potentio dynamic)