Our Product Range

TMT Quenching System

The TMT Quenching System is installed after the final finishing stand of a rolling mill and is used for the controlled thermo-mechanical treatment of TMT rebars and plain round bars. The system rapidly cools the surface of the hot-rolled bar using high-pressure water, followed by self-tempering and controlled cooling to achieve the required metallurgical structure and mechanical properties.

Working Principle

High-Pressure Water Quenching: After leaving the final finishing stand, the hot-rolled bar passes through specially designed quenching pipes equipped with high-pressure water injector nozzles. The controlled water flow rapidly cools the surface of the bar.
Formation of Martensite: The rapid surface cooling causes the outer layer of the bar to transform into martensite, while the core remains at a significantly higher temperature.
Self-Tempering: After leaving the quenching zone, the temperature difference between the hot core and the cooled surface causes heat to flow from the core towards the surface. This residual heat tempers the martensitic surface layer, resulting in tempered martensite.
Core Transformation: As the bar continues to cool on the cooling bed, the remaining hot core undergoes further transformation, developing a predominantly ferrite-pearlite structure. The resulting composite microstructure combines a harder tempered-martensitic outer layer with a relatively ductile ferrite-pearlite core.

Temperature Monitoring & Process Control

The TMT Quenching System incorporates two pyrometers for monitoring the bar temperature at different stages of the process:

Entry Pyrometer: Monitors the bar temperature before it enters the quenching system.
Exit Pyrometer: Monitors the bar temperature after the quenching process.
Water Flow Adjustment: The temperature readings allow the operator to adjust the water flow rate, when required, to achieve the specified product mechanical properties.
Controlled Cooling: Proper control of cooling parameters helps maintain the required thermo-mechanical treatment conditions and product consistency.

Key Features

Suitable for TMT rebars and plain round bars
High-pressure water cooling system
Specially designed quenching pipes and injector nozzles
Entry and exit temperature monitoring through pyrometers

Adjustable water flow for controlled cooling
Suitable for producing special grades of rounds and rebars
Supports controlled thermo-mechanical treatment
Designed for consistent and controlled cooling conditions

At Kathuria, we manufacture TMT Quenching Systems designed to provide the required quenching and self-tempering treatment for special grades of rounds and rebars ranging from 8 mm to 40 mm diameter.

The system is designed for products with an ultimate tensile strength-to-yield strength ratio ranging from 1.15 to 1.26, depending on the product grade and process requirements. The combination of controlled high-pressure water cooling, temperature monitoring, and adjustable water flow enables the required cooling conditions to be maintained during production.

Applications

The TMT Quenching System is suitable for the production of:

TMT Reinforcement Bars
Plain Round Bars

Special Grade Rebars
Special Grade Round Bars