Galvanized steel pipe is a type of pipe made from hot rolled steel, or mild steel,ordinary steel pipe with a layer of zinc coating on the surface.
Galvanized steel pipes are widely used in the market in areas such as construction, industrial equipment, and the power industry.
Common applications include potable water and drainage, fencing, posts, railing systems, and low pressure plumbing.
They are characterized by corrosion resistance, wear resistance, and pressure resistance. Depending on the application, the specifications and sizes of galvanized steel pipes can vary.
Common specifications for galvanized steel pipes are:
- DN15 with an outer diameter of 21.3 mm,
- DN20 with an outer diameter of 26.9 mm,
- DN25 with an outer diameter of 33.7 mm, etc.
These pipes can be welded, but care must be taken during construction. After welding, the galvanized layer must be ground smooth, otherwise, it will affect the quality, and in severe cases, issues such as bubbling or oxidation may occur.
To help users quickly understand the outer diameter sizes when selecting and using galvanized steel pipes, we have compiled a comparison table of galvanized steel pipe outer diameters. This table covers the common outer diameter sizes of galvanized steel pipes available on the market, including specifications such as DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, and DN150.
outer diameter sizes of galvanized steel pipes
| Specification | Outer Diameter (mm) | Common Name |
| DN15 | 21.3 | 1/2 inch pipe |
| DN20 | 26.8 | 3/4 inch pipe |
| DN25 | 33.5 | 1 inch pipe |
| DN32 | 42.25 | 1 1/4 inch pipe |
| DN40 | 48 | 1 1/2 inch pipe |
| DN50 | 60 | 2 inch pipe |
| DN65/70 | 75.5 | 2 1/2 inch pipe |
| DN80 | 88.5 | 3 inch pipe |
| DN100 | 114 | 4 inch pipe |
| DN125 | 140 | 5 inch pipe |
| DN150 | 165 | 6 inch pipe |
| DN200 | 219 | 8 inch pipe |
Processing Methods for Galvanized Steel Pipes
In the use of galvanized steel pipes, we sometimes need to perform some processing, which can be done in the following ways:
Steel Pipe Cutting: Use a cutting machine or saw to cut the steel pipe to the desired length.
Steel Pipe Drilling: Use a drilling machine to create the necessary holes.
Steel Pipe Bending: Use a bending machine to bend the steel pipe to the required angle.
Steel Pipe Welding: Weld two sections of steel pipe together to form a continuous pipeline.
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