TMT 550 D LRF, the first-of-its-kind infrastructural steel bar in South India manufactured using cutting-edge LRF technology, boasts excellent ductility, making it an ideal choice for infrastructural construction projects that require resistance to natural calamities and other disasters. The TMT bars are produced using virgin iron ore and undergo high-tech LRF and Thermax technology, resulting in superior quality 550D grade TMT Bars ranging from 8mm to 32 mm in diameter.
Furthermore, the higher tensile strength of LRF 550D makes it an excellent option for various applications such as coastal and marine engineering and construction, bridge and tunnel building, high-rise structures, and reinforced concrete structures. With its exceptional strength and durability, LRF 550D provides reliable and long-lasting infrastructural solutions even in extreme conditions.
550D LRF is a TMT steel bar grade used for RCC work where higher strength is needed. “550D” refers to the strength and ductility grade, and “LRF” indicates the steel has gone through an additional refining stage before casting. On the Radha TMT product page, 550D LRF is highlighted for excellent ductility and higher tensile strength, with suitability for demanding conditions.
“550” refers to the yield strength level (in MPa), while “D” indicates enhanced ductility within that strength grade. This is why the 550D grade steel bar is commonly chosen for structures that need strength along with controlled bending and deformation capacity under loads.
LRF means Ladle Refining Furnace. It is the step where molten steel is refined in the ladle to keep the chemistry on target and reduce unwanted elements, before the steel is cast into billets. For a 550D LRF TMT bar, this helps keep the steel quality more uniform across the batch.
The listed diameter range for Radha TMT 550D LRF TMT bars is 8 mm to 32 mm.
The page highlights high ductility along with higher strength, supported by controlled carbon and sulphur levels for better toughness and weldability. It also mentions improved fire resistance and elongation up to 18%, making the 550D grade steel bar suitable for demanding structural and seismic applications.
Radha TMT positions 550D LRF for infrastructure and industrial construction, including coastal and marine engineering, bridges and tunnels, high-rise structures, and reinforced concrete structures, especially where durability and disaster resistance matter.
Radha’s comparison notes that Fe 500D (TMT 500D) has 500 MPa yield strength, while Fe 550D has 550 MPa yield strength, making 550D the stronger option with a trade-off of slightly lower ductility. In most decisions, TMT 500D is selected for a strength–ductility balance, while 550D is picked when load-bearing demand and reinforcement efficiency take priority.
TMT bar price today changes with market movement, size, and supply location. Radha TMT publishes a site price list with rates by bar size (RCP per piece), and the safest approach is to cross-check the latest list and confirm the current quote with the sales team for the exact grade and delivery requirement.
Steel rate today per kg is typically shared by the supplier as a per-kg quote and can vary by diameter, grade (TMT 500D vs 550D), and delivery point. When the 550D TMT bar price is shown per piece, the per-kg rate is calculated using the standard theoretical weight for that diameter and the supplied bar length, then dividing the piece rate by the total calculated weight. This is how suppliers usually translate TMT bar price today into a steel rate today per kg figure.
Radha TMT lists 550D LRF as part of its own product range and shares sales enquiry details on the same page. For project buying, this functions as a direct route to the 550D TMT bar manufacturer for availability, dispatch timelines, and the latest quote.
