meaning of Hi in cold rolling mil

When Turbine shaft temp is below 100 deg.centigrade,Then rolling of turbine carried out it is called cold rolling.

Cold rolling involves application of load due to this the grains are elongated...so the material is work hardened and causes to rise internal stresses in the material...due to these stress cold rolling decreases hardness....so after cold rolling a heat treatment process is preferred...

Yes hot rolling create greater draft than cold rolling . This is because during hot rolling the material is hot due to which it is soft thereby making it easy for more draft

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