Basic knowledge of galvanized steel pipes
Galvanized steel pipe refers to the steel pipe surface that is hot-dip galvanized or electro-galvanized to form a layer of zinc protective film on the surface to resist rust and corrosion. Its production process mainly includes the following steps:
1. Pipe making: Use suitable raw materials and make steel pipes of required specifications through cold rolling or hot rolling process.
2. Cleaning: Clean the surface of the steel pipe to remove oil, rust and other impurities to ensure strong adhesion of the galvanized layer.
3. Galvanizing: According to the needs, hot dip or electroplating method is used for galvanizing process to form a uniform zinc layer.
4. Inspection: After completion, the galvanized steel pipe will be strictly inspected for quality, including appearance and thickness testing, to ensure that it meets the standards.
Galvanized steel pipes not only have superior performance, but also have good weldability and machinability. They have become an ideal choice for use in water transmission, gas transmission and various structural parts.
Weight factor of galvanized steel pipes
Nominal wall thickness (mm): 2.0, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, 4.5
Coefficient parameter (c): 1.064, 1.051, 1.045, 1.040, 1.036, 1.034, 1.032, 1.028.
Steel grades: Q215A; Q215B; Q235A; Q235B.
Test pressure value/Mpa: D10.2-168.3mm is 3Mpa; D177.8-323.9mm is 5Mpa
Note: The mechanical properties of steel are important indicators to ensure the final performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe standard, according to different use requirements, tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indicators are specified, as well as high and low temperature properties required by users.
Do buried galvanized pipes need to be treated with anti-corrosion?
Galvanized steel pipe refers to steel pipe with a layer of zinc on the surface, which can improve its corrosion resistance. Therefore, it is a reasonable choice to use galvanized pipe outdoors or in humid environments. However, in some special cases, such as underground pipeline installation, galvanized pipe may need additional anti-corrosion coating treatment.
When constructing buried pipelines, the corrosion protection of the pipelines must be considered to ensure their safety and service life. For galvanized pipes, since their surface is galvanized, they have a certain degree of corrosion protection. However, if the pipeline is in a harsh environment or buried deep, it is necessary to further add an anti-corrosion coating.
How to carry out anti-corrosion coating treatment?
When applying anti-corrosion coating to galvanized steel pipes, you can choose to apply paint or coating with good corrosion resistance, or you can wrap it with anti-corrosion tape, or use materials such as epoxy coal tar and petroleum asphalt. It is worth noting that when carrying out anti-corrosion treatment, the pipeline surface must be dry and clean to ensure that the coating can firmly adhere to the pipeline surface.
Generally speaking, galvanized steel pipes have a certain degree of corrosion resistance and can be directly used for underground burial. However, in conditions of greater burial depth or harsh environment, additional anti-corrosion coating treatment is required to extend the service life of the pipe. When applying the anti-corrosion coating, attention must be paid to the quality of the coating and the use environment to ensure that the anti-corrosion effect is long-lasting and the performance is stable.
Read more: Corrosion Protection and Long-Temm Maintenance of Galvanized Steel Pipes
