Sealed Quenching Furnace (SQF) by Therelek

Therelek’s Sealed Quench Furnace line consists of preheating and tempering furnaces, washing machines, stationary table, hydraulic lifts and charge transfer systems. One can use our sealed quench furnace for various applications like case hardening and carburizing, carbonitriding, normalizing, annealing, ferritic nitrocarburizing, annealing and stress relieving.


Components generally used are gears, shafts, bearings, fasteners, tools, castings, forgings, agricultural machinery components, construction and precision machinery components. The heating system can be electrically heated or gas-fired. Different capacity and batch sizes are available to suit the optimum production requirement.

Furnace walls and hearth are brick-lined to ensure minimum heat loss and low skin temperature. Our Sealed Quench Furnace has pneumatically operated doors with wedge locking in the front and stainless steel inner casing. Horizontal locking cylinders in the rear door ensures maximum sealing.

An enclosed drive system with chains made of anti carburising alloy used in the charge transfer from heating to quenching chamber. Hydro pneumatically operated quench elevator and inner door provide smooth shudder-free movement and trouble-free operation. Full automatic operation through the latest control systems and PLCs
Extremely safe and simple to operate and maintain.

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Features & Specifications of SQF Furnace

Title Description
Temperature Range Up to 1150°C
Insulation Vacuum Formed Ceramic Fibre Boards / Ceramic Fibre Blanket & Module / Refractory Brick Lining
Heating Media Options Electric/Gas Fired/Oil Fired
Heating Elements Nichrome Wire / Special Alloy Resistance Heating Wire / Silicon Carbide Rod Type
Instrumentation options Thyristor, Programmable Temperature Controller, Temperature Recorder, PLC, SCADA, HMI

SQF Image Gallery


More about Sealed Quench Furnace

SQF Applications

  • Annealing
  • Isothermal Annealing
  • Austempering/Bainitic Hardening
  • Carbonitriding
  • Carburising
  • Case hardening
  • Ferritic Nitro carburizing
  • Martempering
  • Normalizing
  • Carbon Restoration

Why Choose Therelek for SQF?

Therelek’s Sealed Quench Furnace (SQF) comes with preheating and tempering furnaces with washing machines, stationary table, hydraulic lifts with automated charge transfers.

Our furnaces come with various size and capacity to suit customer requirements. These are best suited for applications like Annealing, Austempering, Carbonitriding, Carburising, Case hardening, Ferritic Nitro carburizing, Martempering and Normalizing.

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