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.