Method for continuously and thermally galvanizing pipe

Abstract

The invention provides a method for continuously and thermally galvanizing a pipe. In the method, the whole process is completed continuously on line, a hot-rolled steel plate is used as a raw material plate, the whole processing process of the steel strip from unrolling to welding a steel pipe, to galvanizing and to shearing is completed on line, and the fully continuous and automatic production of the thermally galvanized pipe integrates unrolling, leveling, rolling, welding, cleaning, blowing with cold wind, specified length shearing and stacking. The method comprises the following steps: delivering the hot-rolled steel strip to a welding stage; delivering the welded continuous steel strip to a disk loop material storing and leveling stage; delivering the welded continuous steel strip to a rolling stage to longitudinally weld a steel pipe; delivering the steel pipe formed by rolling and welding to a zinc bath 12, and controlling the thickness of a zinc layer by using an annular air blade 13; delivering the galvanized steel pipe to a shearing and stacking stage and delivering the galvanized steel pipe to a specified length follow-up shears 16 to shear the steel pipe by required length; and stacking the steel pipes according to a required height with two stacking machines of which one is spared for later use. Production efficiency is improved and cost and expenses are saved.

Description

technical field [0001] The invention belongs to the field of galvanizing in the metallurgical industry, in particular to the production field of hot-dip galvanizing. Background technique [0002] At present, some of the original domestic galvanized pipes are produced by electroplating, and some are welded by galvanized sheets. The galvanized pipes are galvanized by electro-galvanizing. The thickness of the coating is difficult to control, the coating is thin, the production speed is slow, and the cost is high. Most of the hot-dip galvanizing adopts the cage dip galvanizing method. The steel pipe is cut into the required length, placed in the cage and immersed in a zinc pot. In this way, the zinc layer is coated on both sides, but the actual application is only The outer surface of the steel pipe needs to be galvanized, and the waste of double-sided galvanizing is serious; in addition, the welding process of the galvanized sheet is to roll-form the hot-dip galvanized sheet an...

AI Technical Summary

Problems solved by technology

[0002] At present, some of the original domestic galvanized pipes are produced by electroplating, and some are welded by galvanized sheets. The galvanized pipes are galvanized by electro-galvanizing. The thickness of the coating is difficult to control, the coating is thin, the production speed is slow, and the cost is high. Most of the hot-dip galvanizing adopts the cage dip galvanizing method. The steel pipe is cut into the required length, placed in the cage and immersed in a zinc pot. In this way, the zinc layer is coated on both sides, but the actual application is only The outer surface of the steel pipe needs to be galvanized, and the waste of double-sided galvanizing is serious; in addition, the welding process of the galvanized sheet is to roll-form the hot-dip galvanized sheet and weld it. Repair galvanized layer at weld seam

Galvanized on steel pipes, the production efficiency of these methods is low, continuous production is not possible, the process is complicated, and the labor intensity is high

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