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First of all, let's know what kind of steel pipe is hot dip galvanized steel pipe. In fact, hot dip galvanized pipe is a kind of steel pipe after special processing. Because zinc is generally not found to change in the dry air, the effect of coating a layer of zinc on the surface of the steel pipe is to prevent the corrosion of the steel pipe. We call a kind of steel pipe hot dip galvanized steel pipe. A large number of pipelines used for transporting liquids, such as oil, natural gas, water, gas, steam, etc., are widely used. So, how do we choose qualified high-quality hot dip galvanized steel pipe wisely?
Galvanized steel pipe on the market can be roughly divided into hot dip galvanized steel pipe and galvanized steel pipe these two kinds. General hot dip galvanized layer is thicker, with uniform coating, strong adhesion, conventional use of long life, and other advantages. The cost of galvanized steel pipe is low, and the surface is not very smooth, and its corrosion resistance is much different than that of a hot-dip galvanized steel pipe. So in the choice of galvanized steel pipe or hot dip galvanized steel pipe quality belongs to the top, so in the purchase of hot dip galvanized steel pipe how to distinguish the quality of hot dip galvanized steel pipe?
The performance of hot dip galvanized steel pipe is better than that of other common steel pipes.
The key points of choosing hot-dip galvanized steel pipe are as follows:1, smooth appearance, no zinc tumor, burr, silver white;
2, no hydrogen embrittlement, and no temperature damage, can ensure the mechanical properties of the material are unchanged;
3, good corrosion resistance, neutral salt spray test up to 240 hours.
The above are some points that need to be paid attention to in the selection of hot dip galvanized steel pipe arranged by Xiaobian for you.
Different definitions
Welded pipe refers to a steel pipe with seams on the surface, which is formed by bending and deforming a steel strip or steel plate into a round, square, or other shape and then welded; generally, the fixed length is 6 meters. The production process of welded pipe is simple, the production efficiency is high, the variety and specifications are many, and the equipment investment is low, but the general strength is lower than that of seamless pipe;
Galvanized pipe refers to a welded steel pipe with a hot-dip galvanized or electro-galvanized layer on the surface; galvanizing can increase the corrosion resistance of the steel pipe and prolong its service life.
Different classification
Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of welds; arc welded pipes, electric resistance welded pipes, (high frequency, low frequency) gas welded pipes, furnace welded pipes according to the production process; Welded steel pipes, galvanized welded steel pipes for low-pressure fluid transportation, electric-welded steel pipes for belt conveyor rollers, etc.
Galvanized pipes are divided into cold galvanized steel pipes and hot-dip galvanized steel pipes; cold galvanized steel pipes have been banned, and the latter has been advocated by the state to be temporarily available.
Different uses
Welded pipes are widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction, and are one of the twenty key products developed in my country.
For liquid transportation: water supply, drainage;
For gas transportation: gas, steam, liquefied petroleum gas;
For structure: for piling pipe, for bridge; for wharf, road, building structure, etc.
Hot-dip galvanized steel pipes are widely used in construction, machinery, coal mines, chemicals, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, prospecting machinery, greenhouse construction, and other manufacturing industries.