Difference between rolling process and re rolling process?

a metal rolling mill ia a much larger unit compared to a re rolling mill in terms of variety of products(L,T,I,channel ,rail track& rods sections) & product volume.'ingots'(a large cross section steel casting about 600x600mm) are rolled into' blooms' (150x150 to 400x400).blooms are rolled to billets(40x40 to150x150).these billets are input for re rolling mills which usually produce the mild steel rods from the bilets mainly for civil construction work.the process of rolling however remains the same for rolling & re rolling.some re rolling units however use thge induction furnaces to prepare their own small ingots to be rolled into rods.here the size of the unit is very small compared to rolling mills.