HEAT TREATMENT FURNACES: Hearth Furnaces, Bath Furnaces

 HEAT TREATMENT FURNACES


Hearth Furnaces

These furnaces are heated by fuel which may be coke,
coal, gas (town, blast or natural) and fuel oil. They can also be operated
electrically. They are generally of two types.

 (a)  Stationary type

It consists of four types

(1) 
Direct fuel fired furnace

(2) 
Indirect fuel fired furnace

(3) 
Multiple furnace

(4) 
Re-circulation furnace

 (b)  Movable type

It consists of two types

(1)  The car bottom type

(2)  The rotary type


 Bath Furnaces

In bath type furnaces,
heating may be done using by gas, oil
or
electricity. These furnaces    are further classified as:

(1)  Liquid bath type

(2)  Salt bath type

(3)  Lead bath type

(4)  Oil bath type


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