Ordinary steel pipe size
1. DN15 (1/2 inch) - outer diameter: 21.3mm, wall thickness: 2.75mm
2. DN20 (3/4 inch) - outer diameter: 26.7mm, wall thickness: 2.87mm
3. DN25 (1 inch) - outer diameter: 33.4mm, wall thickness: 3.38mm
4. DN32 (1.25 inches) - outer diameter: 42.2mm, wall thickness: 3.56mm
5. DN40 (1.5 inches) - outer diameter: 48.3mm, wall thickness: 3.68mm
6. DN50 (2 inches) - outer diameter: 60.3mm, wall thickness: 3.91mm
7. DN65 (2.5 inches) - outer diameter: 76.1mm, wall thickness: 4.24mm
8. DN80 (3 inches) - outer diameter: 88.9mm, wall thickness: 4.57mm
9. DN100 (4 inches) - outer diameter: 114.3mm, wall thickness: 4.78mm
2. Seamless steel pipe size
1. DN6-outer diameter: 6mm, wall thickness: 1mm, 2mm
2. DN8-outer diameter: 8mm, wall thickness: 1mm, 1.5mm, 2.0mm
3. DN10-outer diameter: 10mm, wall thickness: 1.5mm, 2.0mm
4. DN15-outer diameter: 21mm, wall thickness: 2mm, 2.5mm
5. DN20-outer diameter: 27mm, wall thickness: 2.5mm, 3mm
6. DN25-outer diameter: 34mm, wall thickness: 2.5mm, 3mm, 4mm
7. DN32-outer diameter: 42mm, wall thickness: 3mm, 4mm, 5mm
8. DN40-outer diameter: 48mm, wall thickness: 3.5mm, 4mm, 5mm, 6mm
9. DN50-outer diameter: 60mm, wall thickness: 3.5mm, 4mm, 5mm, 6mm
10. DN65-outer diameter: 75mm, wall thickness: 4mm, 5mm, 6mm, 7mm
11. DN80-outer diameter: 90mm, wall thickness: 4mm, 5mm, 6mm, 7mm, 8mm
12. DN100-outer diameter: 108mm, wall thickness: 4.5mm, 5mm, 6mm, 7mm, 8mm
3. Application scenarios
1. Ordinary steel pipes are suitable for low-pressure fluid pipelines, electric power, communication projects, etc.
2. Seamless steel pipes are suitable for high pressure, high temperature, chemical industry, petroleum, nuclear power, shipbuilding and other fields.
In short, in construction projects, only by rationally selecting steel pipes of different specifications can they fully play their due role. I hope this article will be helpful for everyone to understand the size specifications and application scenarios of steel pipes commonly used in construction projects.
