Hot Working vs Cold Working (12 Points You Should Know)

The comparison of Hot Working vs Cold Working is mentioned in the table below.

Hot workingCold working

1). Definition: Hot working (also known as hot forming) is defined as a metal forming process in which the plastic deformation of metals takes place above their recrystallization temperature.

1). Definition: Cold working (also known as cold forming) is defined as a metal forming process in which the plastic deformation of metals takes place below their recrystallization temperature.
2). Examples of hot working.
Hot rolling,
Hot forging,
Hot spinning,
Hot drawing,
Hot extrusion,
Hot piercing.
2). Examples of cold working.
Cold rolling,
Cold shearing,
Cold spinning,
Cold drawing,
Cold bending,
Cold piercing.
3). In hot working, the coefficient of friction is high (around 0.6)3). In cold working, the coefficient of friction is low (around 0.1)
4). Amount of mechanical force required for hot working is less (because the metal is heated).4). Amount of force required for cold working is more (because the metal is not heated).
5). Very high amount of thermal energy is required to heat the metal to its recrystallization temperature.5). Amount of heat required is less as the operation takes place at or near the room temperature.
6). Surface finish obtained by hot forming is not good.6). Surface finish obtained by cold working is better than that obtained with hot working.
7). Hardening of metals does not take place.7). The metals get work-hardened.
8). By hot forming, very less residual stresses are developed inside the metals.8). By cold forming, high amounts of residual stresses are developed inside the metals.
9). The uniformity in material is maintained by hot working.9). Uniformity of material is lost during cold working.
10). The crystals are refined by hot working of metals.10). The grains are just elongated or distorted during cold working of metals.
11). Hot worked metals show less dimensional accuracy.11). Cold worked metals show higher dimensional accuracy.
12). Hot working can be used for large components as the plastic deformation becomes easy at higher temperatures.12). Cold working is not suitable for large components.

I hope you have clearly understood the comparison of Hot working vs Cold working.

I have also provided the image showing this comparison. So you can also save the image if you want.

Hot working vs Cold working

If I will give you all the differences in this single image, then this image will be very long.
Hence, refer the above table for all the differences.

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