Abstract
In a plate rolling production line, thermomechanically controlled processing is critical for plate quality. In this paper, a set of intermediate cooling equipment of a two-stand plate mill with super density nozzles, medium pressure, and small flow is developed. Based on a simplified dynamic model, a cooling control scheme with combined feedforward, feedback, and adaptive algorithms is put forward. The new controlled rolling process and the highly efficient control system improve the controlled rolling efficiency by an average of 17.66%. The proposed intermediate cooling system can also effectively inhibit the growth of austenite grain, improve the impact toughness and yield strength of Q345B steel plate, reduce the formation of secondary oxide scale on the plate surface and the chromatic aberration of the plate surface, and greatly improve the surface quality of the steel plate.
Highlights
Thermomechanical control processing (TMCP) is a microstructural control technique combining controlled rolling and controlled cooling
Experiments have proved that the temperature drop of intermediate slab by water cooling during controlled rolling can reduce 15–20% of the holding time and improve the rolling efficiency to a certain degree [13]
After the intermediate slab has left the cooling zone, the rear blowing system promptly blows away the residual water on the slab surface to prevent the warping head phenomenon of the slab caused by uneven cooling of the upper and lower surface of the slab during finishing rolling process
Summary
Thermomechanical control processing (TMCP) is a microstructural control technique combining controlled rolling and controlled cooling. The mechanical properties introduced to the steel through TMCP route are virtually equivalent to those obtained by heat treating conventionally rolled or forged steel It can be optimized by control of phase transformation of austenite with cooling technology during or after hot rolling process [1, 2]. Research shows that the water cooling of intermediate slab in temperature holding process can reduce holding time and improve the rolling efficiency under the premise that no mechanical properties of the products would be reduced [8,9,10,11]. Experiments have proved that the temperature drop of intermediate slab by water cooling during controlled rolling can reduce 15–20% of the holding time and improve the rolling efficiency to a certain degree [13].
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