Flagship Product

TMT Bars

High-strength thermo-mechanically treated bars engineered for superior structural integrity and earthquake resistance. Advanced Thermex technology for the perfect balance of strength and ductility.

Grade Fe500D / Fe550D

Size 8mm – 32mm

Standard IS 1786:2008

Length 12 Meters

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GR Steels Fe 550D TMT Bars — Premium Construction Solutions

About This Product

GR Steels
TMT Fe 550D

Strength. Resilience. Innovation.

Premium Quality TMT Bars

Corrosion and seismic resistant TMT bars that provide ultimate foundational support for all constructions.

Applications

High-rise buildings, residential complexes, industrial structures, nuclear power plants, airports & railways.

BIS Certified Quality

Every batch tested and certified to IS 1786:2008 standards with full traceability — trusted by 500+ builders.

Dual-Core Technology

Strong Outside,
Flexible Inside

Our TMT bars feature a revolutionary dual-core structure created through the Thermex quenching process — a hard outer layer for strength, and a soft inner core for flexibility.

Tempered Martensite

Hard outer layer provides exceptional strength and surface hardness for load-bearing.

Ferrite-Pearlite Core

Soft inner core provides ductility, weldability, and superior earthquake resistance.

D for Ductility

Unbreakable Ductility

The "D" in Fe 550D stands for Ductility — the ability to bend without breaking. GR Steels TMT bars pass the most rigorous bend and re-bend tests, ensuring your structures are built to survive.

3d Bend Test — No Crack

7d Re-bend Test — No Crack

16% Min. Elongation

Higher elongation for better ductility in earthquakes
Can be bent and re-bent without loss of strength
Perfect for seismic Zone III, IV & V construction
The flexibility that protects life & infrastructure

Bar Anatomy

Engineered From Core to Surface

Every GR Steels TMT bar is precision-engineered with a distinct ribbed surface and a dual-phase cross-section — delivering the perfect synergy of grip, strength, and flexibility that modern construction demands.

Ribbed Surface Pattern

Precision-engineered ribs ensure maximum grip and bonding with concrete for rock-solid reinforcement.

Hard Outer Martensite

Thermex-quenched outer layer delivers exceptional surface hardness and tensile strength.

Soft Ferrite-Pearlite Core

The ductile inner core absorbs seismic energy and allows bending without cracking.

Grade Marking — Fe 550D

Every bar is roll-marked with grade, brand, and BIS certification for full traceability.

GR Steels TMT Bar Cross Section — Fe 550D

Tempered Martensite
Outer Layer

Ferrite-Pearlite
Core

Precision
Rib Pattern

Grade Marking
Fe 550D

Build With Confidence

The Foundation of Your Dream Home

Every dream home begins with the right foundation. GR Steels TMT bars are trusted by thousands of homeowners and builders across Karnataka to deliver structures that stand strong for generations.

500+ Builders Trust Us

100+ Years of Durability

4 Cities Across Karnataka

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Save More

15–20% Steel Savings

GR Steels Fe 550D TMT bars deliver a higher yield strength (550 N/mm²) compared to Fe 500 bars — meaning you need less steel for the same structural strength. This translates to significant cost savings on every project without compromising safety.

Less steel per m² of construction

Lower overall project cost

Reduced carbon footprint

Fe 500

Fe 550D

20% Less

Product USPs

Built To Withstand Anything

Every GR Steels bar is engineered to deliver unmatched performance across critical construction parameters.

Earthquake Resistance

Superior ductility and high elongation ensure structures withstand seismic forces with ease.

Fire Resistance

Withstands temperatures up to 600°C without significant loss of structural strength.

Superior Weldability

Low carbon equivalent ensures easy welding without compromising joint integrity.

Corrosion Resistance

Thermo-mechanical treatment creates a protective oxide layer against rust and corrosion.

Bonding Strength

Precision rib pattern ensures maximum bond with concrete for stronger reinforcement.

Cost Effectiveness

Higher strength-to-weight ratio means 15–20% steel savings without compromising safety.

Properties

Technical Specifications

Element	Fe500D (% Max)	Fe550D (% Max)
Carbon (C)	0.25	0.25
Sulphur (S)	0.040	0.040
Phosphorus (P)	0.040	0.040
S + P	0.075	0.075
Carbon Equivalent	0.42	0.44

Property	Fe500D	Fe550D
Yield Stress (Min)	500 N/mm²	550 N/mm²
UTS / YS Ratio (Min)	1.08	1.06
Elongation (% Min)	16%	14.5%
Total Elongation at Max Force	5%	5%
Bend Test	3d — No crack	4d — No crack
Re-bend Test	7d — No crack	7d — No crack

Diameter (mm)	Weight (kg/m)	Standard Length
8mm	0.395	12 meters
10mm	0.617	12 meters
12mm	0.888	12 meters
16mm	1.580	12 meters
20mm	2.469	12 meters
25mm	3.858	12 meters
32mm	6.321	12 meters

IS 1786:2008

BIS Certified

ISI Mark

Where It's Used

Key Applications

Residential

Individual houses, apartments, and multi-story residential complexes with superior earthquake resistance.

Commercial

Shopping malls, office towers, hotels, and commercial buildings requiring high structural strength.

Infrastructure

Bridges, flyovers, dams, tunnels, and highways demanding long-term durability and load-bearing capacity.

Industrial

Factories, warehouses, power plants, and heavy industrial structures with demanding performance criteria.

TMT Bars