Service Life of Hot-dip Galvanized Seamless Steel Pipe in Different Environments

The hot-dip galvanizing process is a relatively stable and reliable steel surface treatment solution to resist environmental corrosion. There are many factors that affect hot-dip galvanizing, such as: steel substrate composition, surface state (such as roughness), substrate internal stress, geometry The thickness of the base material has a greater impact on the thickness of hot-dip galvanizing, and generally the thicker the steel pipe is, the greater the thickness of hot-dip galvanizing. According to the requirements of the national standard, the local thickness of hot-dip galvanizing should not be less than 56μm, and the average thickness should not be less than 70μm.

If calculated according to the national standard, the average thickness is 70μm, the amount of zinc attached is 70x7.2=504g/m2, and the service life in four different environments is about:

Heavy industrial park: 12 years, the annual corrosion rate is 40.1;
Coastal area: 46 years with a corrosion rate of 10.8 per year;
Suburban areas: 93 years, with an annual corrosion rate of 5.4;
Urban areas: 28 years with an annual corrosion rate of 17.5;

Hot-dip galvanized seamless pipe is processed by pickling and rust removal, zinc pool galvanizing, surface passivation and other processes, so that the zinc pool is firmly attached to the surface of the steel pipe. Galvanized seamless steel pipes last longer.

If you want to further improve the anti-rust effect of galvanized steel pipe, you can use the method of physical anti-rust, that is, brush a layer of anti-rust paint or spray a layer of anti-rust paint on the surface.

Extended information:

Galvanized pipe has a long life of corrosion resistance. The principle of spraying aluminum and zinc spraying anti-corrosion coating on steel structure is cathodic protection. In a corrosive environment, even if the anti-corrosion coating is partially damaged, galvanized pipe still has the ability to sacrifice itself to protect the steel Effect.

Galvanized pipes are divided into two methods: arc spraying and flame spraying. Compared with flame spraying, arc spraying greatly improves work efficiency and work safety. The bonding force of the coating is also far greater than that of flame spraying, so the quality of the coating can fully meet the needs of long-term anticorrosion. In the United States, the cost of using arc spraying anticorrosion construction is lower than that of heavy anticorrosion paint, so the most spraying technology is steel The most effective way to prevent corrosion of structures.

Permanent Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of carbon seamless steel pipe (seamless line pipe/seamless boiler tube/seamless galvanized pipe/hydraulic steel tube), welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.