Reheating furnaces in steel Industry

In steel plants reheating furnaces are used in hot rolling mills to heat the steel stock (Billets, blooms or slabs) to temperatures of around 1200 deg C which is suitable for plastic deformation of steel and hence for rolling in the mill. 

Different type of batch and continuous furnaces are described below.
1.Batch furnace -These are the older type of furnaces which are capable of heating all grades and sizes of steel. 
2.Continuous pusher furnace– In this type of furnace cold steel stock is pushed forward with the help of pushers at the charging side. 
3.Rotary hearth furnace – A rotary hearth furnace is used for heating round billets in pipe plants and for heating short length blooms or billets in a forging plant.
4.Walking beam furnaces – Initially walking beam furnaces were designed with alloy steel walking beams which were exposed directly to the furnace heat and were also subjected to heat corrosion. 
5.Walking hearth furnaces – It is similar to the walking beam furnace when passage of steel stockl through the heating chamber is considered.
6.Roller hearth reheating furnaces – Roller hearth furnaces are used to advantage when heating very long billet, bloom or slabs in the situation where it is not practical for heating in a pusher or walking beam furnace.

Today we are talking about is continuous pusher furnace,Advantages of the pusher type furnaces are as follows:

• High production per unit capital investments

• High hearth area efficiency

• Higher specific production per unit of space utilized.

• Low maintenance cost

• Ease of charging and discharging of material

• Lower temperature differences between two pieces of material pushed.

• More control of the rate of heating at all temperature levels.

• Gradual rise in temperature permits charging of all grades of cold materials.

• Can be built for larger length of the piece to be heated to have higher rolling mill yield

Re-heating furnace

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