In TMT bars, a range of grades are available such as Fe 415, Fe 500, Fe 550, Fe 550 D and Fe 600. Among them, Fe 500, and Fe 550D are the most widely used TMT bar grades for upscale construction, including flyovers, bridges, high-rise buildings, etc.

UNDERSTANDING NOMENCLATURE

• TMT stands for Thermo-Mechanical-Treatment
• Rebar is a type of steel bar used to strengthen concrete,
• ‘Fe’ is a symbol in chemistry use for Iron,
• 415, 500, 550 are variants of TMT Steel Rebars available in the market,
• 415, 500 and 550 refers to the minimum yield strength of the bar, (Yield Strength is the maximum strength a steel can endure beyond which it begins to permanently deform)

THERMO-MECHANICAL TREATMENT (TMT)

Thermo-mechanical treatment (TMT) is a metallurgical process that combines heating and deformation to improve the mechanical strength of the steel. It’s also known as “new generation” steel.

How it works

• Steel is heated to a high temperature, such as 1200–1300°C
• The steel is deformed through mechanical processes like rolling, forging, or compression
• The steel is cooled rapidly, such as through water quenching
• Benefits TMT steel has high strength and ductility, TMT steel is resistant to corrosion, and TMT steel is weldable.

Uses of TMT steel:

• Reinforced concrete structures
• Earthquake-resistant buildings
• High-rise buildings
• Bridges and flyovers
• Industrial and commercial structures
• Foundation and footings
• Slabs and beams
• Columns and pillars