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 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.
Standard: EN39, ASTM A53, BS1387-85, GB/T3091-08, JIS-G3444, ISO65, BS1139 etc
Hot Galvanized Steel Pipe
hot galvanized steel pipe refers to a steel pipe that has undergone the galvanizing process, where a protective zinc coating is applied to the steel surface to prevent corrosion. hot galvanized steel pipe standards are BS1387, ASTM A53, GB/T3091 and so on.
Pre Galvanized Steel Pipe
Pre-galvanized steel pipe refers to a steel pipe that has undergone the galvanizing process prior to its use or installation. Zinc coating of pre galvanized steel pipe is usually 30 g/m2 at average.
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