VIZAG TMT (QST) rebars are produced by VSP ('A Navratna Company') from fully killed virgin steel. Fe 550 grade conforms to IS 1786:2008 with minimum yield strength 550 N/mm2, UTS 585 N/mm2 and 8% elongation; typical VSP values are YS 611, UTS 707 N/mm2 and 20.0% elongation. Sizes 8, 10 and 12 mm are not regularly rolled in Fe 550 grades. Recommended welding length is 7.5 x dia.

Key features

• Low carbon content, made from fully killed steel
• Quenching and Self Tempering (QST) gives a strong tempered martensite surface layer with a ductile ferrite-pearlite core
• Combination of high strength and high ductility
• tensile to yield strength ratio always greater than 1.12
• Superior rib design for excellent bonding with cement
• mean projected area much more than IS 1786 specified values
• Easy bendability, weldability and excellent ductility
• can be butt welded or lap welded without pre-heating or post-heating
• Good resistance to ageing and superior corrosion resistance
• Higher corrosion resistance and seismic resistance compared to CTD bars
• Wide size range from 8 mm to 40 mm
• intermediate sizes like 18 and 22 mm allow steel savings in design

Applications

• Any type of concrete structure (RCC construction)
• Construction in adverse conditions (corrosion-resistant grades)

Specifications

Grade: Fe 550 | Minimum Yield Strength (YS): 550 N/mm2 | Minimum Ultimate Tensile Strength (UTS): 585 N/mm2 | Minimum Elongation: 8 % | IS 1786:2008 UTS/YS Ratio: 1.06 | Typical Yield Strength (VIZAG TMT): 611 N/mm2 | Typical UTS (VIZAG TMT): 707 N/mm2 | Typical UTS/YS Ratio (VIZAG TMT): 1.16 | Typical Elongation (VIZAG TMT): 20.0 % | Recommended Welding Length: 7.5 x dia (IS 2751-1979 welding code) | Size Note: Sizes 8, 10 and 12 mm are not regularly rolled in Fe 550 grades | Steel Type: Fully killed steel, made from virgin steel via Blast Furnace - Basic Oxygen Furnace - Continuous Casting route | Process: Quenching and Self Tempering (QST) TMT; 120 m cooling bed for self tempering | Standard Length: 12 m uniform; 9 m / 12 m on mutual agreement | Length Tolerance: As per IS 1786:2008 | Heat Weight: 140 T | Bloom Size: 320 x 250 | Typical Inclusion Rating (IS 4163-1982): A 1.5, B 1.0, C 0.5, D 1.0 (Thin Series) | Available Sizes: 16, 18, 20, 22, 25, 28, 32, 36, 40 mm | Packing: Bare, in strapped bundles / piles weighing approx. 7 to 8 metric tonnes | Invoicing: As per actual weight

Standards: IS 1786:2008

Packing: Bare, in strapped bundles / piles of approx. 7 to 8 metric tonnes; 12 m uniform length (9 m / 12 m on mutual agreement); invoiced as per actual weight