This unit is suitable for processing carbon steel and stainless-steel narrow strip steel. It has the following characteristics: 1. Control measures for pressure adjustment deviation and positive/negative bending of work rolls; 2. Plate shape control methods such as pre-set intermediate roll lateral movement and roll cooling; 3. Carbon steel with strip width of 1200mm and the minimum rolling thickness of 0.14mm; 4. Maximum rolling speed of carbon steel is 1200mpm.