Furnaces for Heat Treatment

Car bottom furnace:

Furnaces of this type have a movable bottom (car). The car goes out of the furnace and may be loaded or unloaded with treated parts. The heating method may be either electric resistance or fuel/gas. Car bottom furnaces are suitable for various heat treatment operations of large and heavy parts.

Bell type furnace:

Furnaces of this type have a movable vertically heating bell and a stationary bottom with the treated parts. The heating method may be either electric resistance or fuel/gas. Bell type furnaces are suitable for coiled strip annealing and other heat treatments including operations in controllable atmosphere.

Vertical pit furnace:

Furnaces of this type are used for heat treatment of shaft like parts which are loaded vertically through the top of the furnace. The heating method may be either electric resistance or furnace oil/ LDO /gas.

Belt furnace:

Furnaces of this type have a mesh belt conveyor moving through a long tube like furnace. The heating method may be either electric (resistance or induction) or fuel/gas. Belt furnaces are suitable for heat treatment of relatively small parts.

Roller furnace:

Furnaces of this type have heat resistant steel rollers moving the parts through a long tube like furnace. The heating method may be either electric or fuel/gas. Roller furnaces are suitable for heat treatment of sheets, tubes and other long parts.

Pusher furnace:

Furnaces of this type are used for heat treatment of shaft like parts which are loaded vertically through the top of the furnace. The heating method may be either electric resistance or furnace oil/ LDO /gas.

Salt baths have many advantages over other heat treatment processes, viz Rapid rate of heat transfer in the salt bath gives higher output Uniform and accurate control of temperature can be available through out the bath and the components.

 Salts For Carburising

ALFA CARB - I

Salt for Carburising with Working Range 760°-950°C ( ICI Equivalent -'Rapicarb-H' )

ALFA CARB - II

Salt for Carburising with Working Range 800°-950°C (ICI Equivalent - 'Rapicarb-S' )

Neutral Salts

Industries and applications:

• ALFA 660 Working Range 660°C-900°C ( ICI Equivalent - `NC 660' )
• ALFA 660 is used for hardening various tool steels, preheating high-speed steels hot work.
• Steels prior to hardening with ALFA 970. ALFA 660 is denser than ALFA 720, but less soluble in water.
• ALFA 660 does not ecarburize the charge.
• The working range can be increased upto 1000°C by covering the molten salt with ALFA ECONOMISER. (225 gm per 100 kg ).
• ALFA 720 Working Range 720 - 900°C ( ICI Equivalent - WS 720 )
• ALFA 720 is a salt which neither carburise nor ecarburize the steel and it readily dissolves in water.

 Salts for Quenching and Tempering

• ALFA 540 Working Range 540-700°C ( ICI Equivalent - QS 540 )
• ALFA 540 can be used for minimum distortion and less risk of cracks than in oil quenching.
• ALFA 495 Working Range 495 - 700°C ( ICI Equivalent - QS 495 )
• ALFA 330 Working Range 330 - 535°C (ICI Equivalent - TS 330 )
• ALFA 330 can be used for the heat treatment of ALUMINIUM ALLOYS. After solutionising in ALFA 330, the same can be precipitation hardened in ALFA 150.
• ALFA ECONOMISER
• ALFA 220 Working Range 220 - 550°C (ICI Equivalent - TS 220 )
• ALFA 150 Working Range 150 - 550°C (ICI Equivalent - TS 150 )