Corrosion Resistant Alloy Steel Rebar

High-quality Fe 500CRS and Fe 550CRS grades for durable construction and enhanced longevity in structures.

Maintaining Strength, Ductility, and Toughness over Long Service Life

AISCO 500CRS and AISCO 550CRS Corrosion-Resistant Alloy TMT Deformed Steel Rebars

Corrosion-Resistant Alloy (CRA) TMT deformed rebars are specially engineered reinforcement steels designed to withstand aggressive environments where conventional rebars are prone to rust and deterioration. By combining low carbon content, thermo-mechanical treatment, and special corrosion-resistant alloying elements, these rebars offer superior durability, ductility, and structural safety.

Standards Compliance

Indian Standards: IS 1786:2008 (High strength deformed steel bars for concrete reinforcement).
Seismic Detailing: IS 13920:2016 (Ductile detailing of RC structures subjected to seismic forces).
International Standards:
- ASTM A615/A615M (Grade 80) – USA.
- DIN 488 (BST 500 M) – Germany/Europe.
- BS 4449:1997 (GR 460 B) – UK.

Chemical Composition (Typical Range)

Carbon (C): ≤ 0.15% (for ductility & weldability).
Manganese (Mn): 0.5 – 1.5% (strength & toughness).
Chromium (Cr): 0.3 – 1.0% (corrosion resistance).
Copper (Cu): 0.2 – 0.4% (chloride-induced corrosion resistance).
Phosphorus (P) & Sulphur (S): ≤ 0.05% (controlled for improved toughness).

Metallurgical Features

Thermo-Mechanical Treatment (TMT):
- Quenching + self-tempering → Hard martensitic surface + ductile ferrite-pearlite core.
Alloy Protection:
- Chromium and Copper improve resistance against chloride, carbonation, and industrial pollution.
Low Carbon Design:
- Ensures toughness, ductility, and superior weldability.

Mechanical Properties

Yield Strength: 500 – 600 MPa (Fe 500/Fe 550 grades).
Ultimate Tensile Strength (UTS): ≥ 1.08 × Yield Strength.
Elongation (Uniform): ≥ 14.5% (as per IS 13920:2016).
Fatigue Resistance: Excellent under cyclic loading.

Key Advantages

✅ Corrosion Resistance – Enhanced service life in coastal, marine, and industrial environments.
✅ Seismic Safety – High ductility & elongation ensures energy absorption during earthquakes.
✅ Low Maintenance – Reduces lifecycle cost of structures.
✅ Weldable & Bendable – No preheating required during fabrication.
✅ High Bond Strength – Deformed ribs ensure superior grip with concrete.

Applications

Coastal and marine structures (ports, jetties, bridges).
Industrial plants (chemical, fertilizer, power).
Urban infrastructure (flyovers, high-rise buildings, metros).
Structures in chloride & sulphate-rich soils.

AISCO 500CRS and AISCO 550 Corrosion-Resistant Alloy TMT Rebars combine the strength and ductility of low-carbon TMT rebars with special alloying for corrosion resistance, ensuring longer service life, reduced maintenance costs, and superior safety in aggressive environments.

Corrosion-Resistant Alloy Steel Deformed Bars for Concrete Reinforcement

Code: HSN 72142090, NIC 24105

Indian Standards: IS 1786:2008 (Grade Fe 550) = American Standards: ASTM A706/A706M (Grade 80) = Euro Standards DIN 488 (BST 500 M) and = British Standards: BS4449:1997 (GR 460 B)