Method for improving thick plate production efficiency of single-stand rolling mill

Abstract

The invention discloses a method for improving thick plate production efficiency of a single-stand rolling mill, and relates to the technical field of steel rolling production. The method includes thefollowing steps that T1, primary heating rolling is carried out, and the heating temperature is 1100-1250 DEG C; T2, an intermediate slab is directly cooled to 100-400 DEG C after primary heating rolling is finished; and T3, secondary heating rolling is carried out, the heating temperature is 900-1000 DEG C, and direct rolling to obtain the thickness of a finished product is carried out after tapping. The method adopts a manner of heating rolling again after direct cooling of the intermediate slab, the cooling time of the intermediate slab is saved, the efficiency of the rolling mill is significantly improved, and the hourly output of the rolling mill is further greatly increased.

Description

technical field [0001] The invention relates to the technical field of steel rolling production, in particular to a method for improving the production efficiency of thick plates in a single-stand rolling mill. Background technique [0002] Controlled rolling and controlled cooling technology is a new technology for steel rolling production developed at home and abroad in the past 20 years. Due to the deepening of people's understanding of the mechanism of controlled rolling and controlled cooling, coupled with modern equipment and detection and control methods in steel rolling production The application of controlled rolling and controlled cooling technology is becoming more and more perfect, especially in the production of medium and heavy plates. This new production technology has been valued by the metallurgical circles at home and abroad. Improve the toughness and performance of steel. [0003] At present, medium and heavy plate factories across the country adopt two-s...

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Problems solved by technology

However, when this commonly used controlled rolling method for medium and heavy plates is required to produce medium plates with good low-temperature impact properties, because the final rolling temperature required for the steel plate is very low, the corresponding multi-pass continuous rolling in the non-recrystallized area The rolling temperature is also very low. Such a low rolling start temperature in the non-recrystallized area brings the following problems: 1. The time for waiting for the temperature drop of the intermediate billet is prolonged, and the idle time of the rolling mill will be prolonged sharply, which seriously affects the rolling efficiency of the rolling mill; 2. Due to the low rolling temperature in the non-recrystallized area and the corresponding large deformation resistance, within the limited capacity of the rolling mill, it is necessary to control the reduction of the pass and increase the number of rolling passes, which also affects the technical experience such as machine-hour output and power consumption. index

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