How to Judge the Quality of Galvanized Steel Pipe?

Dec. 09, 2020

Galvanized steel pipes are welded steel pipes with hot-dip galvanized or electro-galvanized layers on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong the service life. Galvanized steel pipes are used in a wide range of applications. In addition to line pipes for conveying water, gas, oil, and other general low-pressure fluids, they are also used as oil well pipes and oil pipes in the petroleum industry, especially offshore oil fields, as well as oil heaters and condensate for chemical coking equipment. Pipes for coolers, coal-distilled wash oil exchangers, pipe piles for trestle bridges, pipes for support frames in mine tunnels, etc. So how to judge the quality of galvanized steel pipe?

1. The galvanized flat steel correction level of galvanized steel pipe and its electric welding level are also very harmful to the quality of the other square pipe.

2. The dimensional tolerances of galvanized steel pipes, including linear dimensional tolerances, are not manipulated within the scope of national standards or contract signing.

3. The price of galvanized steel pipes reflects the advantages and disadvantages of hot-dip galvanizing. The raw materials and labor services of galvanized steel pipes have a certain cost. Therefore, good and qualified square steel pipes are not far from each other at the price level. Large, hot-dip galvanized steel pipes are thick and expensive, and the price is relatively high.

Galvanized Steel Pipe

The key to the quality of the galvanized steel pipe is the amount of hot-dip galvanizing on the surface of the galvanized steel pipe.

1.The quantity of hot-dip galvanizing determines the quality of the square steel pipe: the key to the quality of the hot-dip galvanizing of the square steel pipe is that the thickness of the hot-dip galvanizing determines the true and false of the hot-dip galvanizing and the level of quality. The thickness of the steel pipe plate is more than 70μm, and most of the square steel pipes of the general electroplating process can exceed 10μm. The thickness of the hot-dip galvanized layer determines the level of corrosion resistance.

2. Which hot-dip galvanized or cold-sprayed galvanized steel to choose from: Galvanized steel pipes can be treated with cold-sprayed galvanized steel and hot-dip galvanized steel. That is to say, the zinc salt solution is more painful than the electrolysis method, and the coating is applied to the plated parts. Generally speaking, there is no need to heat, and the amount of zinc is very small. Dip galvanizing air pollutants discharge less and less, the air pollutants of hot-dip galvanizing are mainly the waste acid of pickling passivation steel parts. The air pollutants of cold spraying zinc include the waste acid of pickling passivation steel parts. , Electroplating process wastewater, waste passivator, etc. The type and a total number of air pollutants discharged by cold spray zinc are much larger than that of hot-dip galvanizing. Therefore, hot-dip galvanizing is more technical for galvanized steel pipes.

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