Abstract
A rolling mill engineer under the present situation should meet the increasing demand for steel products. It is necessary therefore for him to investigate into how rolling should be done so that every roling products might be sound and free from defects and made on the paying and commercial scale. Being based on the results of experimental researches at some large bar mills for the past seventeen years, the present paper intented to explain how much influence is exerted on the rolling mill eapacity by different shapes of roll calibres and decreased numbers of rolling passes. It is also shown that the rolling velocity of a large bar mill is almost equal to that of a blooming mill. Consequently it is possible to raise the efficiency by increasing the unit weight of rolling billets.
