Frame-space controlled cooling method during rolling hot-roll H sectional iron

Abstract

The invention relates to an inter-frame cooling control method for H-beam hot rolling, which belongs to the field of metal pressure machining. During the H-beam rolling process, under the condition that original rolling rules and tempos are not changed, partial cooling is carried out to the outer side of the flange of the H-beam by utilizing residual space between continuous rolling mill train frames and adopting a high-efficient gas spray cooling method. By the application of the technique, the temperature at the leg-waist connection part and the flange of the H-beam is lowered, temperature difference on a final rolling section of the H-beam is reduced, crystal grains at the leg-waist connection part and the flange are thinned, the residual stress of an H-beam product is greatly reduced,waves are prevented from being cooled by a web, and web cracking is reduced, therefore, the finished product rate of the H-beam is greatly improved and the comprehensive mechanical property of the H-beam is improved. The H-beam produced by the technique completely conforms to the requirements of the GB / T11263-2005 standard of 'Hot-Rolled H-Beam and Cut-T Section'.

Description

technical field [0001] The invention belongs to the field of metal pressure processing, and in particular provides a method for controlling cooling between racks in the rolling process of hot-rolled H-shaped steel. And flange temperature, homogenized H-beam final rolling section temperature. Background technique [0002] As a kind of economic section steel, H-beam has the advantages of large section modulus, strong bending resistance, light unit weight, beautiful appearance, convenient structure, saving man-hours, reducing engineering cost, and can be processed and recycled compared with ordinary I-beams. It has been widely used in beam and column structural components in industrial and civil building steel structures, steel structure load-bearing supports of industrial structures, industrial equipment structures such as petrochemical and electric power, long-span steel bridge components, machinery, vehicles, and ship frame structures. , In engineering structures such as un...

AI Technical Summary

Problems solved by technology

In the case of such a large temperature difference in the final rolling section, it is difficult to achieve the desired effect simply by cooling after rolling; for the reversible continuous rolling unit, if the rolling is carried out through the flange outer control cooling device before and after the universal rolling unit Cooling during the process, due to the instability of the shape during the H-beam rolling process, the equipment is often damaged. At the same time, in order to ensure the uniform cooling of the H-beam head and tail, it is necessary to flick the tail during the H-beam rolling process to change the original The H-beam rolling rhythm will seriously affect the production efficiency

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