Galvanized Steel Pipe
Galvanized steel pipes are divided into hot-dip galvanized steel pipes and pre-galvanized steel pipes, which are welded steel pipes with a galvanized layer on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and extend its service life.
Hot-dipped galvanized pipes create an alloy layer by reacting molten metal with the iron matrix, thereby combining the matrix and the coating. The process involves pickling the steel pipe to remove surface iron oxide, followed by rinsing in an aqueous solution of ammonium chloride or zinc chloride, or a mixed solution of ammonium chloride and zinc chloride, before immersion in the hot-dip galvanizing bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life. The complex physical and chemical reactions between the base of the hot-dip galvanized steel pipe and the molten coating form a tightly structured zinc-iron alloy layer with strong corrosion resistance. Hot dipped galvanized pipes have a wide range of uses, including not only as pipeline pipes for general low-pressure fluids such as water, gas, and oil, but also as oil well pipes and oil transmission pipes for the petroleum industry, especially offshore oil fields, as well as pipes for oil heaters, condensers, coal tar washing oil exchangers in chemical and coking equipment, and for pile pipes in wharves and support frames in mine tunnels.
Pre-galvanized pipes have a very small amount of zinc coating, only 20-50g/m2, and their corrosion resistance is much lower than that of hot-dip galvanized pipes. Pre-galvanized pipes cannot be used for water and gas pipelines. The zinc layer of pre-galvanized steel pipes is thin and simply adheres to the steel pipe base, making it prone to peeling off, resulting in poor corrosion resistance.
Hot Dip Galvanized Steel Pipes
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Pre Galvanized Steel Pipes
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Zinc Coating Thickness
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220g/m2 at average
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30g/m2 at average |
30um
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4um
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Steel Pipe Thickness | 1.0mm and above | 0.8mm to 2.2mm |
International Standards
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ASTM A53, BS1387, JIS G3444,
ISO65, EN10255 |
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Pipe Ends | Plain, Beveled, Threaded, Groove | Plain, Threaded |
88 products found
The pipes are used in water treatment, fire prevention and have a great fire fighting capacity.
pipes are frequently used in water treatment, oil exploration, fire prevention, and have a great fire fighting capacity.
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Galvanized Steel Pipe Factories and Production Lines
Tianjin Youfa Steel Pipe Group Co., Ltd -- No.1 Branch
16 galvanized pipe production lines and 9 black welded steel pipe production lines
Tangshan Zhengyuan Steel Pipe Co., Ltd
12 galvanized pipe production lines and 17 black welded steel pipe production lines and 4 lining plastic steel pipe production lines
Handan Youfa Steel Pipe Co.,Ltd
8 galvanized pipe production lines and other 37 production lines producing welded steel pipe, square and rectangular pipe, galvanized square and rectangular pipe, spiral welded pipe and lining plastic steel pipe
Shaanxi Youfa Steel Pipe Co., Ltd
6 galvanized pipe production lines and other 27 production lines producing welded steel pipe, square and rectangular pipe, galvanized square and rectangular pipe, spiral welded pipe and lining plastic steel pipe, plastic coated steel pipe
Jiangsu Youfa Steel Pipe Co., Ltd
6 galvanized pipe production lines and other 23 production lines producing welded steel pipe, square and rectangular pipe, galvanized square and rectangular pipe
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