Cooling device of steel plate

Abstract

The invention provides a cooling device of a steel plate. The cooling device of the steel plate at least comprises a plurality of U-shaped upper collecting tubes located above the steel plate and arranged along the running direction of the steel plate, eight rows of U-shaped tubular nozzles are arranged along the running direction of each U-shaped upper collecting tube in order to improve the water spray capacity of unit time. By adopting the cooling device of the steel plate, low pressure water can be utilized to cool so as to reach a cooling speed required by quenching, therefore, the cooling device and a water supply system are simplified, and the energy consumption and the cooling cost are reduced.

Description

technical field [0001] The present invention relates to a steel plate cooling technology, in particular, to a steel plate cooling device. Background technique [0002] When the high temperature steel plate is cooled online after hot rolling, it is divided into two processes: accelerated cooling and direct quenching. Quenching is an important means to improve the strength of the steel plate. Direct quenching should be undertaken by two sets of devices and two sets of high and low pressure water supply systems, or by one set of devices and two sets of high and low pressure water supply systems. In order to obtain the cooling speed required for the quenching treatment, the high-temperature steel plate after hot rolling first enters the high-pressure cooling zone of the cooling device during the conveying process of the roller table, and uses high-pressure water of about 0.8MPa for rapid cooling, so that the temperature of the hardened layer of the steel plate decreases rapidly....

AI Technical Summary

Problems solved by technology

In the existing steel plate cooling equipment, the fundamental problem is that the configuration of the impact area of ​​the water flow is unreasonable; the gravity field has different effects on the upper and lower jets, resulting in a mismatch of the main heat transfer mechanism or a large cooling effect of the same heat transfer mechanism. Difference in capacity; uniform and symmetrical cooling at the center plane of the plate thickness cannot be achieved

Secondly, the internal cooling rate of the steel plate is limited by its thermal conductivity, the properties of the processed products are uneven, and the residual stress is large

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