Question

The process of hot extrusion is used to produce?
(A) Curtain rods made of aluminium
(B) steel pipes of domestic water supply
(C) stainless steel tubes used in furniture
(D) Large size pipes used in city water mains.

Answer 1

Hint : Hot extrusion procedure is a special procedure which operates in the very high temperature generally above the substance’s recrystallization temperature. This method is used to produce the materials of fixed cross- sectional profile.

Complete Step By Step Answer:
The hot-extrusion procedure is a hot-profile working phenomenon. It is a very special procedure as it is used for the manufacturing of the material with a typical geometry and the fixed cross- sectional area.
So, now on the basis of the above information, hot extrusion procedure can be defined as the manufacturing process for the production of special steel profiles with a constant longitudinal cross section.
This procedure works by the phenomenon of ‘compression’. This method is useful in the production of the hollow or solid steel profile bars with special typical geometry and constant cross-sectional area.
Thus, on the basis of our above discussion we can say that the correct answer is option B i.e. steel pipes of domestic water supply. Therefore Hot extrusion procedure is used to produce the steel pipes of domestic water supply.

Note :
This procedure is used widely because it has some advantages over the other methods. This method has a low cost of manufacturing and is very easy to set up the process. It has a low minimum order quantity. Also using this method we can obtain the shapes and sizes of the materials that are not obtainable by the other methods.
There are other extrusion procedures also, like the cold-extrusion process and the friction extrusion and micro-extrusion etc.