Post-rolling fast cooling system for on-line solution treatment of steel plates

Abstract

The invention belongs to the metal rolling field and discloses a post-rolling fast cooling system for on-line solution treatment of steel plates. According to the system, rolling heat left after the steel plates are rolled is utilized, a compact top and bottom inclined spraying type fast cooling device is installed between a heat straightening machine and a cooling table for conducting the on-line solution treatment on the steel plates, the steel plates are uniformly cooled, and the cooling process is accurately controlled in a full-automatic mode. The investment of the fast cooling system is small, the cooling device is compact and saves the energy, the cooling rate is high, the thickness specification range of the steel plates capable of undergoing controlled cooling is wide, the automatic control accuracy is high, the shapes of the plates after being cooled are good, and carbon emission and tremendous energy consumption caused by off-line heat treatment and secondary heating can be reduced. The system can be widely applied to the cooling process after the steel plates are rolled and the production control field.

Description

technical field [0001] The invention belongs to the field of metal rolling, and in particular relates to a cooling system for steel plates after rolling. Background technique [0002] Solution heat treatment refers to a heat treatment process in which the alloy is heated to a high-temperature single-phase region and maintained at a constant temperature, so that the excess phase is fully dissolved into the solid solution and then rapidly cooled to obtain a supersaturated solid solution. It is mainly to improve the plasticity and toughness of steel and alloys, prepare for precipitation hardening treatment, etc.; it can fully dissolve various phases in the alloy, strengthen the solid solution, improve toughness and corrosion resistance, eliminate stress and soften, so as to continue processing or molding. Suitable for many special steels, especially high manganese steel and austenitic stainless steel. [0003] For alloys with low supersaturation, faster cooling rates are usua...

AI Technical Summary

Problems solved by technology

However, the biggest defect of laminar flow cooling is that the surface water stays under a large amount of water, resulting in uneven cooling; the water ratio of the rough cooling section and the fine cooling section is fixed and the transverse flow rate cannot be adjusted, which is not conducive to the control of the plate shape.

[0015] To sum up, many unique designs and research results have been put forward for some problems of post-rolling cooling at home and abroad, and good results have been achieved in solving some specific problems, but there are also many design defects, such as Most of them are unconstrained cooling, and it is difficult to ensure the shape of the cooled plate at high cooling rates; generally, the arrangement of direct quenching and accelerated cooling devices (DQ+ACC) is used, and it is difficult to achieve a consistent cooling rate throughout the cooling process; In order to achieve a large temperature drop, most devices require a large amount of water, resulting in a serious waste of resources; there is no detection and tracking means for the steel plates in the cooling zone, and it is difficult to achieve precise steel swing and fully automatic control

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