Galvanized steel pipes are divided into hot-dip galvanizing and cold-galvanizing. The hot-dip galvanizing is to soak the pipe in the high-temperature zinc liquid so that the zinc penetrates into the surface of the steel. The surface of the pipe has a thick zinc layer and corrosion resistance higher than that of cold-dip galvanizing. Galvanized pipes are resistant to corrosion and seamless pipes can withstand higher pressures. Galvanized steel pipe is not easy to rust due to zinc protection.
Main functional characteristics of galvanized steel pipes
1. Strong corrosion resistance: The surface of the galvanized steel pipe is covered with a layer of zinc, which can effectively block the erosion of air, water and chemicals, and extend the service life of the steel pipe.
2. Easy maintenance: The surface of the galvanized steel pipe is smooth and flat, not easy to accumulate dust, easy to clean, and easy to maintain.
3. Beautiful and durable: The galvanized steel pipe has a bright surface and uniform color. It is not easy to fade and oxidize, and maintains its beauty for a long time.
What Should be Paid Attention to when Cutting Galvanized Steel Pipes at Low Temperature?
Low temperature brittleness will cause embrittlement at 0℃ and below. If the transportation, loading and unloading, installation and construction of galvanized pipes under low temperature conditions cannot be avoided, you can avoid using low-pressure thin-walled pipes in advance, and try to use high-pressure grade galvanized pipes to improve the safety factor.
1. The transfer process avoids shock and stress. Galvanized steel pipe is very brittle at low temperatures. Therefore, when transporting, transferring, loading and unloading at low temperatures, it should be handled with care. Violent actions such as "throwing, dropping, dragging, rolling" are prohibited. It is not easy to find cracks on the rear appearance, and the problem can only be discovered through a water pressure test.
2. After the galvanized steel pipes are transported to the construction site, they should be properly stored to prevent the pipes from contacting or colliding with sharp objects. People are not allowed to step on the pipes, especially when unloading thin-walled pipes, to prevent the pipes from cracking and internal injuries due to embrittlement. The connection of low-temperature steel pipes is generally made by glue, and the inner wall of the pipe sleeve and the outer wall of the pipe are penetrated into the parts.
3. When the temperature is low, you can use a blowtorch to heat the bonding part to speed up the curing speed. The socket can be moved after 2 hours of penetration. Small diameters can be rotated 90° to allow for more even distribution of adhesive, and medium and large diameters can be pried in with an iron rod or pulled in with a wire puller to ensure better adhesion by piercing the bottom of the socket.
Things to note when welding
1. To ensure the welding quality, the weld should be galvanized.
First, grind off the galvanized layer at the welding point, clean the galvanized layer with a hand grinding wheel or sandpaper, or use a gas welding flame to clean the galvanized layer, otherwise bubbles, sand holes, cold welding, etc. will appear, and the weld will become brittle and reduce rigidity.
2. Galvanized steel pipes with a diameter greater than 100mm should be connected with flanges or special ferrule-type pipe fittings.
3. The weld between the galvanized pipe and the flange should be galvanized twice.
Read more: What Indicators should be Considered when Purchasing Galvanized Steel Pipes?
