Water circulation method and water circulation system for improving surface quality of hot-rolled strip steel

Abstract

The invention discloses a water circulation method and system for improving the surface quality of hot-rolled strip steel. Indirect cooling circulation water of an indirect cooling circulation water system is filtered and cooled to be recycled by a user of the indirect cooling circulation water system. Laminar flow cooling circulating water of a laminar flow cooling circulating water system is filtered and cooled to be recycled by the laminar flow cooling system. Direct cooling circulating water of a direct cooling circulating water system is filtered and cooled to be recycled by a user of thedirect cooling circulating water system; water replenishment of the direct cooling circulating water system uses drained water of the laminar cooling circulating water system and the indirect coolingcirculating water system and new water; and the direct cooling circulating water system discharges sewage. A reverse cross water supply process, namely new water-clean circulating water-turbid circulating water-laminar flow water-new water, is adopted, so that the comprehensive concentration multiple of the clean circulating water and the turbid circulating water can be more than 3, the laminar flow water quality requirement can be met, and hot rolled strip steel meeting different user requirements can be produced under the existing descaling condition.

Description

technical field [0001] The application belongs to the technical field of hot-rolled strip steel production, and in particular relates to a water circulation method and a water circulation system for improving the surface quality of hot-rolled strip steel. Background technique [0002] Surface quality is one of the main quality indicators of hot-rolled strip steel. When the adhesion between the oxide scale on the surface of the hot-rolled strip steel and the substrate is not good, it is easy to fall off in powder form during the process of Kaiping and processing, and black ash is generated. Scale, red rust, intrusion of foreign matter, and scratches are typical surface quality defects of hot-rolled strip steel. In particular, during the rolling process of hot-rolled steel sheets, a layer of iron oxide scale will be formed on the surface of the steel sheet, which is difficult to remove, resulting in problems such as red rust, iron sheet pressing, and pickling residues on the ...

AI Technical Summary

Problems solved by technology

However, it will cause black and gray problems on the surface of the strip steel, seriously affect the surface quality of the product, and cannot meet the production requirements of high-strength structural steel, silicon steel and other high-end products.

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