Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-rack wide and thick plate rolling line

Abstract

The invention relates to a production method for controlling the transverse plate shape of a high-quality carbon structural steel plate based on a single-rack wide and thick plate rolling line. The production method comprises the following steps that (1) a plate blank is heated, specifically, the thickness of the plate blank is 200-300mm, and the tapping temperature of the plate blank is controlled to be 1080-1140 DEG C; (2) rolling is conducted, specifically, the initial rolling temperature of the plate blank is 1050-1100 DEG C, the thickness of an intermediate blank is 30-200mm, different amounts of water are used for cooling the intermediate blank with different thicknesses through a water cooling device, the water cooling ending temperature is controlled to be 870-950 DEG C, and the final rolling temperature of the plate blank is 800-880 DEG C; and (3) the straightening and red returning temperature of the steel plate is controlled to be 600-700 DEG C. According to the production method, in the rolling process of the carbon structural steel plate, the low straightening and red returning temperature is obtained by integrating execution of a series of key process temperature point control measures, the high-precision transverse plate shape is obtained, and meanwhile the production efficiency of a rolling mill is not reduced; and by the adoption of the production method, the transverse unevenness of the finally-manufactured steel plate is smaller than or equal to 5mm/plate width size, and the market competitiveness is high.

Description

technical field [0001] The invention relates to the technical field of hot-rolled wide and thick plates in the metallurgical industry, in particular to a production method for controlling the transverse shape of high-quality carbon structural steel plates based on a single-stand wide and thick plate rolling line. Background technique [0002] Steel grades 45 and 50 steel (with a carbon content of 0.42% to 0.55%, hereinafter referred to as "carbon plate") are high-quality carbon structural steels that are more common in wide and thick plate products, and are widely used in machinery manufacturing, plastic molds and other industries. Due to the fierce competition in the homogenization of carbon plate varieties in the wide and thick plate market, end customers of carbon plates pay more attention to the applicability of their quality rather than compliance when choosing products. For example, the end customers of carbon plates put forward the requirement of unevenness ≤ 7mm / (pla...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that when the existing single-frame wide and thick plate production line produces carbon structural steel plates, the process accuracy cannot meet the customer’s requirements for high-precision horizontal plate shape, and at the same time, the existing method has low production efficiency of the rolling mill and high production cost. To solve the problem, provide a production method based on a single-stand wide and thick plate rolling line to control the transverse shape of high-quality carbon structural steel plates

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