Main Features of a modern Hot Strip Mill Dec22

Main Features of a modern Hot Strip Mill...

Main Features of a modern Hot Strip Mill The objective of a hot strip mill (HSM) is to reheat and roll thick slabs into thin strip with a wide range of thickness. Because of its huge size and large investment a hot strip mill need to have a life time of several decades. The mill must be capable of meeting the market demands for a wide range of steel grades, in particular, high strength and advanced high strength steels (AHSS) with good cold formability and with superior strip properties. The mill should be able to meet the following requirement High mill availability coupled with high productivity and high yields. Meeting the need of low maintenance. Meeting the need of lower energy consumption. Improved product quality by meeting close thickness and profile tolerances as needed by the modern day customers, through powerful controls and adjustments. These tolerances may be much closer than specified in various international standards. More flexible rolling schedules to ensure short delivery times and economical rolling of smaller lot sizes. For achieving these demanding requirements, many important features are incorporated in the modern conventional hot strip mills. Some of these are described below. Reheating furnace – Modern hot strip mills are equipped with energy efficient walking beam furnaces which are normally computerized controlled. These reheating furnaces uniformly heat the slabs to the target temperatures at the required production rates and without skid marks and without cold spots. These furnaces are capable of receiving cold or hot slabs as the charge material in the furnace. Descalers – Descalers are a must in hot strip mills for attaining good surface quality. Present day descalers employ state of the art nozzle technology with highly effective application of high pressure water (upto 400 bars). Descalers are...