Workshop Technology
A two high rolling mill consists of two rolls which rotate

At different speeds and in the opposite direction
At the same speed but in opposite direction
At the same speed and in the same direction
At different speeds and in the same direction

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Workshop Technology
During hot working of metals

All of the listed here
Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains

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