| The Flow Sheet of Rolling Mill | Layout of NO.1 HSM The major operating process of Hot Strip Mill consists of heating the slab to rolling temperature, roughing down the slab to a predetermined intermediate thickness, then precisely rolling at seven four-high finishing stands to the order thickness. After that, the laminar cooling system sprays water for rapid cooling of the rolled strip to the desired coiling temperature. Finally, the strip is coiled by the down coiler.