Composite galvanized army green steel pipe for refrigeration and manufacturing method of composite galvanized army green steel pipe

Abstract

The invention discloses a composite galvanized army green steel pipe for refrigeration and a manufacturing method of the composite galvanized army green steel pipe. The composite galvanized army green steel pipe comprises a steel pipe positioned on the innermost layer and is characterized in that a zinc-iron alloy layer is arranged on the outer surface of the steel pipe; a pure zinc layer is arranged on the outer surface of the zinc-iron alloy layer; an army green passivation layer is arranged on the outer surface of the pure zinc layer; a first closing layer and a second closing layer are separately arranged outside the army green passivation layer; and a product is obtained by the steps of carrying out deoiling, thermal treatment, composite galvanization, preheating, burnishing, washing with water, colored passivation, drying, closing for two time and drying. The composite galvanized army green steel pipe has a good binding force; a passivation bonding force among layers is high and weather fastness of the passivation layer is high; a finished product of the steel pipe has excellent wear resistance; the composite galvanized army green steel pipe has the advantages of good bright line, smoothness, anti-tarnishing property, rigorous process and high stability of the finished product; and when a condenser and a dew removable tube are manufactured, a protective heat shrink tube does not need to be added, so the working procedure is simple.

Description

technical field [0001] The invention relates to steel pipe manufacturing technology, in particular to a composite galvanized army green steel pipe for refrigeration and a manufacturing method thereof. Background technique [0002] In the prior art, there are mechanical manufacturing methods for colored pipes. For example, the patent publication number is CN1840835A, a kind of corrosion-resistant light-duty colored steel pipe, which is composed of a manganese steel pipe body, and a layer of plastic is arranged on the outer surface of the manganese steel pipe body. Membrane, using high-strength low-alloy high-quality manganese steel as the inner layer, using the transfer film to treat the surface of the manganese steel pipe body to make a plastic outer surface layer, in order to improve the corrosion resistance of the manganese steel pipe, and process various patterns on the plastic transfer film and colors. It is also obtained by chemical methods, such as the patent publicat...

AI Technical Summary

Problems solved by technology

The neutral salt spray test of ordinary galvanized steel pipes commonly used for refrigeration is generally 72h, and the color is monotonous. performance, there are many processes and a large amount of labor, and when the heat shrinkable tube shrinks poorly, it cannot protect the steel pipe well

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