Adukia Industries is one of the leading TMT bar manufacturers in India and a trusted supplier of advanced iron and steel products, committed to providing innovative solutions for the construction industry. Our UltraMax 550D TMT bars are designed to offer outstanding durability, strength, and flexibility to meet the demands of modern construction projects, making them a preferred choice of TMT bars for construction across residential, commercial, and infrastructure projects. Engineered using cutting-edge technology, these UltraMax TMT bars & Coils serve as the backbone for buildings, industrial sheds, transmission towers, dams, and roads, among others.
Utilising advanced German Thermax TMT bar technology, we produce TMT bars of Fe 550D grade, with a size range of 8mm to 32mm.
Backed by decades of experience in iron and steel manufacturing, Adukia Industries has earned its place among the best TMT bar company in India for builders, contractors, and steel dealers. Our fully integrated production chain — from sponge iron and billets to the final rolling of TMT bars — allows us to maintain a level of consistency that few other TMT bars manufacturers in India can match. Every batch is tested against BIS standards and produced under ISI-certified quality checks, which is why architects and engineers regard us as the best TMT bar in India for projects ranging from residential homes to large infrastructure. As one of the most dependable TMT bar suppliers in the country, we also work closely with dealers who want a reliable long-term TMT bar supplier for their region. To see how our UltraMax range compares with other leading names, read our detailed guide on top TMT bar brands in India for construction.
Headquartered in Kolkata, Adukia Industries is recognised as one of the established TMT bar manufacturers in Kolkata and a leading TMT bar company in West Bengal, with an integrated production base that serves builders and dealers across eastern India. Whether you're looking for a dependable TMT bar company in Kolkata for a large housing project or a trusted TMT bar supplier in Kolkata for regular dealership supply, our production capacity and quality systems are built to serve both. As one of the well-known TMT bar manufacturers in West Bengal, we also supply TMT bar in Kolkata and neighbouring districts directly from our plants and depots. Find our full list of offices and plant locations on our locations page, or read how we became one of Kolkata's top TMT bar manufacturers.
Strength: Ultramax Fe 550D TMT bars are designed to provide exceptional strength and elongation compared to traditional bars, resulting in safer and stronger concrete structures while using less steel. These bars are highly elastic and pliable and offer excellent welding capabilities. With their low carbon content, our TMT bars are incredibly durable, resistant to bending and rebending, and have superior welding capabilities with minimal overlap. These bars provide reliable and robust solutions.
Earthquake Resistance: Ultramax Fe 550D TMT bars at Adukia Industries boast enhanced strength, elongation, and ductility, making them ideal for earthquake-resistant construction projects.
Heat Resistance: Ultramax Fe 550D TMT bars exhibit exceptional strength retention during testing at temperatures up to 500°C, and only a marginal decrease in yield strength is observed in the range of 550°C to 600°C.
Corrosion Resistance:Ultramax Fe 550D TMT bars utilize advanced German technology, featuring a fine layer of scales that acts as a protective barrier, ensuring exceptional corrosion resistance and durability. Learn more about the features of corrosion-resistant TMT bars we manufacture.
Our state-of-the-art rolling mill follows a precision-controlled TMT bar manufacturing process, positioning Adukia among the technologically advanced TMT bars manufacturers producing Fe 550D grade bars at scale. See the complete manufacturing process in detail.
| INGREDIENTS | BIS | Ultramax FE 550D | Ultramax FE 550D Low Alloy Steel |
| Carbon Max (%) | 0.25 | 0.2 | 0.14 |
| Manganese (%) | 0.5 to 0.80 | 0.5 to 0.80 | 0.50. to 0.90 |
| INGREDIENTS | BIS | Ultramax FE 550D | Ultramax FE 550D Low Alloy Steel |
| Sulphur (%) | 0.04 | 0.03 | 0.035 |
| Phosphorus (%) | 0.04 | 0.035 | 0.035 |
| Carbon Equivalent | 0.27 to 0.42 | 0.30 to 0.35 |
| Grade | YIELD(min N/sqmm) | UTS (min N/sqmm) | UTS (min N/sqmm) | |||
| BIS | ULTRAMAX | BIS | ULTRAMAX | BIS | ULTRAMAX | |
| Fe-500D | 500 | 530 | 565 | 630 | 14.5 | 20 |
| FE-550D | 550 | 570 | 550 | 630 | 14.5 | 20 |
| Ultramax FE 550D Low Alloy Steel | 550 | 560 | 600 | 620 | 14.5 | 22 |
For a complete breakdown of grade-wise specifications, see our detailed TMT bar specification sheet.