Production technology of high-surface quality thin-gauge hot-rolled pickling galvanized sheet

Abstract

The invention belongs to the technical field of iron and steel processing, and particularly relates to a production technology of a high-surface quality thin-gauge hot-rolled pickling galvanized sheet. The production technology of the thin-gauge hot-rolled pickling galvanized sheet includes the following steps that a raw material coil is produced by endless and continuous casting and rolling process of strip steel, then pickling, drain, first drying, leveling, water washing, electromagnetic induction heating, galvanizing, air knife blowing, cooling in rear section, water cooling, middle loop,finishing, straightening, passivating, second drying, outlet loop, inspection, oiling, and coiling into a hot-dip galvanized coil are carried out through the pickling technology, and the product thickness is 0.8mm-4.0mm. The production technology of the thin-gauge hot-rolled pickling galvanized sheet can reduce or eliminate defects of leak plating, pits and the like on the surface of the strip steel, alleviate the surface leak plating problem of the thin plate hot-rolled pickling galvanized sheet, further eliminate a part of internal distortion, and is conducive to subsequent cross-cutting, longitudinal cutting and forming processing and production, and improves the yield of products of the company and customer.

Description

technical field [0001] The invention belongs to the technical field of iron and steel processing, and in particular relates to a production process of a hot-rolled pickled galvanized sheet with high surface quality and thin specification. Background technique [0002] In the past few years, my country's industrial development environment has undergone profound changes, and the deep-seated contradictions accumulated over a long period of time have become increasingly prominent. As far as the steel industry is concerned, overcapacity and serious homogenization competition have led to a serious oversupply in the market. As a result, demand in the iron and steel industry is sluggish and prices remain low. At the same time, the upstream iron ore industry is monopolized. The prices of labor, land, fuel and power continue to rise. The pressure on the cost of production factors is increasing, and the constraints on the ecological environment are intensified, which further reduces the ...

AI Technical Summary

Problems solved by technology

With the increase of customer usage, the requirements for surface corrosion resistance are also getting higher and higher, so the usage of thin-gauge hot-rolled pickled galvanized sheets is also increasing, but because the surface of the strip is still pickled, it cannot Avoid the defects caused by some hot rolling genetics, because after cold rolling and annealing, such defects are difficult to completely eliminate, which has a crucial impact on missing plating from galvanizing, so there is an urgent need for a production line design that can Reduce or even eliminate the impact of hot rolling defects, so as to meet the basic requirements of customers for galvanizing

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