Overview Of Hot Rolling Mill Technology

The hot rolling mill, as the core equipment of the metallurgical industry, mainly consists of a heating furnace, a rough rolling mill line, a finishing rolling mill line and a coiler. Its working principle is to heat the steel billet to an austenitic state of 1100-1250℃, and then cause plastic deformation of the metal through multiple rolling passes. A typical four-roll hot continuous rolling mill is equipped with a hydraulic AGC (Automatic Thickness Control) system and a roll bending device, which can ensure a thickness accuracy of ±50μm. The maximum rolling speed of the modern hot rolling line can reach 25m/s, and the annual production capacity exceeds 5 million tons.
Temperature control: A step-by-step heating furnace combined with a laminar flow cooling system is adopted to achieve precise control of the final rolling temperature within ±15℃
Deformation strengthening: Through the "Controlled Rolling and Controlled cooling" technology (TMCP), the grain size of the steel is made to reach above ASTM grade 12
Energy-saving design: The hot loading and hot delivery process (HCR) can reduce heating energy consumption by 30%
Intelligent development: The rolling force prediction model based on big data analysis can keep the scrap rate below 0.3%
Hot-rolled products are widely used in: the construction industry (H-beams, rebar); Mechanical manufacturing (gear steel, bearing steel) Energy equipment (pipeline steel, pressure vessel steel) Automobile manufacturing (wheel steel, beam steel)
With the application of new technologies such as headless rolling and ultra-fast cooling, hot rolling mills are developing towards high efficiency, greenness and intelligence. A domestic 2150mm hot continuous rolling mill has achieved stable production of 8.0mm thin specification products, marking that China's hot rolling technology has reached the international advanced level.