Annular jet cooling device for controlled cooling of hot-rolled seamless steel tubes

Abstract

An annular jet cooling device for controlled cooling of hot-rolled seamless steel tubes comprises an upper half water spray ring and a lower half water spray ring. The upper half water spray ring and the lower half water spray ring are identical in structure and symmetrically arranged and communicate with a bypass flow collector pipe. An adjusting valve group is connected between the water spray rings and the bypass flow collector pipe and achieves control over the water spray flow and the water pressure. The outer surfaces of the water spray rings are provided with water inlets. The inner surfaces of the water spray rings are provided with a plurality of cooling nozzles, wherein the cooling nozzles are sequentially distributed. A cooling compensation nozzle is installed between the side ends of the middle attached faces of the upper half water spray ring and the lower half water spray ring. The jet direction of the cooling nozzles and the moving direction of a steel tube form an included angle. The jet direction is towards the positive direction or the reverse direction of the moving direction of the steel tube. According to the annular jet cooling device for controlled cooling of the hot-rolled seamless steel tubes, the water spray flows of the upper half water spray ring and the lower half water spray ring are independently set, controlled cooling can be carried out on conventional hot-rolled seamless steel tubes of any diameters through setting of the number of the opened water spray rings, the water pressure and other parameters, the finish cooling temperature can be accurately controlled, and the annular jet cooling device for controlled cooling of the hot-rolled seamless steel tubes is higher in applicability and significantly improves the cooling evenness.

Description

technical field [0001] The invention belongs to the technical field of production of hot-rolled seamless steel pipes, in particular to an annular jet cooling device for controlled cooling of hot-rolled seamless steel pipes. Background technique [0002] For a long time, due to the particularity of the production process and the complexity of the annular section, compared with hot-rolled plates, profiles, rods and wires, hot-rolled seamless steel pipes lack controlled rolling and cooling technology in the rolling production process, and thus Effective organizational performance regulation cannot be achieved. In order to improve the microstructure and mechanical properties of hot-rolled seamless steel pipes, currently we can only rely on the addition of alloying elements or the subsequent off-line heat treatment process, resulting in a significant increase in production costs and a decrease in production efficiency. If the on-line controlled cooling after hot-rolling of the p...

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Problems solved by technology

[0011] However, it is difficult to accurately control the final cooling temperature due to the poor controllability of the swirling water in the cooling process when the steel pipe is cooled by the scouring action of the swirling water flow.

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