Steel tube on-line cooling roller bed control method

Abstract

The invention relates to the steel tube production on-line heat treatment technology. A steel tube on-line cooling roller bed control method can effectively control the roller bed running, starting and stopping, roller beds comprise a main conveying roller bed behind a sizing mill and an on-line cooling roller bed arranged in an on-line cooling production device, and the on-line cooling productiondevice is arranged beside the main conveying roller bed behind the sizing mill in parallel. By means of the steel tube on-line cooling roller bed control method, according to the steel tube real-timetracking position and metal detector detection signals, running, starting and stopping of the main conveying roller bed and the on-line cooling roller bed are controlled, and normal running and steeltube production smoothness of the on-line cooling production device are effectively guaranteed; and in addition, the sizing mill outlet alignment manner and the before-cooling roller bed starting time are optimized, and therefore the on-line cooling production rhythm is accelerated.

Description

technical field [0001] The invention relates to on-line heat treatment technology for steel pipe production, in particular to a roller table control method for on-line cooling of steel pipes. Background technique [0002] On-line cooling of a certain cooling rate range is implemented on hot-rolled seamless steel pipes, the purpose is to improve the strength and toughness of steel pipes, replace off-line heat treatment, simplify the process, reduce energy consumption, and reduce costs. [0003] For the production process of hot-rolled seamless steel pipes, considering the stability of the rolling line and the smoothness of production, in order to reduce the deformation resistance of metal materials in the process of pipe piercing and rolling deformation, the heating and forming process of the current pipe billet is usually required to be relatively high. within the temperature range. High-temperature heating and high-temperature deformation will make it difficult to use the ...

AI Technical Summary

Problems solved by technology

However, due to the lack of post-rolling cooling means, the previous hot-rolling process of seamless steel pipes usually uses air-cooling on a cooling bed to cool to room temperature after the steel pipe is sized, which basically fails to achieve the purpose of controlling the microstructure and improving the comprehensive mechanical properties.

[0004] At present, some research institutions and manufacturers at home and abroad have carried out experimental research on controlled cooling of hot-rolled seamless steel pipes after rolling, but at present they mainly focus on the on-line normalization (heating) process and direct on-line quenching process. It is not used in large quantities on products, but only used for performance improvement of a small number of products, etc.

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