Hot strip mill is composed of roughing mill and finishing mill. There are three types of rough mill components: semi-continuous, 3/4 continuous and full continuous: the semi-continuous type has a scale breaking (removal of iron oxide) rack and 1 reversible rack with vertical roller; For a 3/4 continuous model, in addition to the above frame, there are two serially arranged racks; The full continuum consists of 6 to 7 racks. Finishing mill group is composed of 5 ~ 7 continuously arranged racks and coiler. The hot strip mill is named according to the length of the roll. Finishing mill work rolls with a length of 1700mm, known as hot strip mill, can produce 1550mm wide strip coil.