1. Rust-resistant on both sides: internal and external protection, extending service life.
Both the inner and outer surfaces of the steel pipe are coated with a two-layer zinc coating (a layer of zinc-iron alloy and a layer of pure zinc), which simultaneously protects the base material from corrosion caused by the fluid inside the pipe (such as water and gas) and the external environment (such as rainwater and soil).
For buried scenarios (such as water supply pipes), the zinc coating can resist corrosion caused by acidic and alkaline substances as well as microorganisms in the soil, and its service life is 5 to 8 times longer than that of ordinary steel pipes. (Ordinary steel pipes begin to rust within two to three years when buried underground, whereas hot-dip galvanized steel pipes can last from 15 to 20 years.)
During fluid transfer, the zinc coating remains stable without leakage and meets the hygiene standards for drinking water (a food-grade galvanizing process must be selected). It is safe for use in transporting tap water.
2. Lightweight and high-strength: Achieving a balance between load-bearing capacity and cost
Hollow structures are 40% to 60% lighter than solid steel (such as round steel), which reduces transportation and installation costs. At the same time, they exhibit excellent resistance to deformation and bending—for example, the bending strength of square steel pipes exceeds that of angle steel of the same weight by more than 20%.
The base material is made of low-carbon steel, which has good flexibility and can be bent, cut, and otherwise processed to suit complex installation scenarios (such as curved railings and pipes with irregular shapes).
Hot-dip galvanizing does not alter the mechanical properties of the base material, nor does it affect the steel pipe's ability to withstand pressure and its resistance to impact (for example, a welded DN100 pipe can withstand a water pressure of 1.0 megapascal, meeting the requirements for water supply in civil applications).
3. Fluid transfer advantages: low resistance and easy maintenance
The inner wall of the circular steel pipe is smooth, and its flow resistance coefficient is low (30% lower than that of cast-iron pipes), which enables reduced energy consumption during transportation and lowers the risk of pipe blockage (for example, calcareous deposits are less likely to accumulate when transporting tap water).
The galvanized layer is stable and will not flake off due to corrosion from liquids, thus preventing water quality contamination or a reduction in flow rate caused by rust on the inner wall of the pipe.
The connection methods vary (threaded connection, flange connection, groove connection), and the assembly is convenient. In the subsequent maintenance phase, it suffices to periodically inspect the joint seal only; there is no need to replace the lines regularly.
4. High adaptability to the environment: It withstands all scenarios.
It can be used reliably within a temperature range of -40℃ to 60℃. There is no risk of embrittlement at low temperatures, and the zinc coating does not melt at high temperatures (the melting point of zinc is 419℃).
Resistant to various environments: rain and snow in outdoor settings, coastal salt spray, industrial dust, and corrosion from buried soil; suitable for numerous fields such as municipal, chemical, and agricultural applications.
When in contact with materials such as concrete and soil, the zinc coating does not cause chemical reactions, and it can be buried directly underground or incorporated into concrete for use (such as pre-buried pipes in buildings).
5. High cost performance: The cost over the entire lifecycle is controllable.
Initial purchase cost: 15%-25% higher than that of conventional steel pipes, but more than 60% lower than that of stainless steel pipes, striking a balance between corrosion resistance requirements and budget constraints.
Maintenance cost: After a single galvanization process, the service life of the pipe can range from 15 to 30 years (in open-air environments), and it does not require removing rust or repainting the pipe. The maintenance cost is only one-tenth of that for conventional steel pipes.
Low replacement cost: Due to their excellent corrosion resistance, pipelines are not easily damaged, which reduces production downtime and repair costs resulting from pipe bursts (such as leakage losses in chemical pipelines).