Pipe18STD Steel Pipe — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Outer Diameter (OD) | 18 | 457.2 mm |
| Wall Thickness (t) | 0.375 | 9.5 mm |
| Area (A) | 19.4 in² | 125.2 cm² |
| Weight | 70.7 lb/ft | 105.2 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 756 | 756 | in⁴ |
| Elastic Section Modulus (S) | 84 | 84 | in³ |
| Plastic Section Modulus (Z) | 109 | 109 | in³ |
| Radius of Gyration (r) | 6.24 | 6.24 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 1510 | in⁴ |
| Warping Constant (Cw) | 0 | in⁶ |
Design Resources
- Section Properties Database — Compare with other sections
- Steel Pipe Reference — Full pipe dimension table
- Steel Grades Reference — Material properties
Frequently Asked Questions
What is the weight of a Pipe18STD pipe section? 70.7 lb/ft (105.2 kg/m).
What is the section modulus of Pipe18STD? Sx = 84 in³, Zx = 109 in³ (strong axis). Sy = 84 in³, Zy = 109 in³ (weak axis).
What steel grade is standard for Pipe18STD? ASTM A53 Grade B (Fy = 35 ksi) for pipe sections. Verify with mill certificate.
What is the moment of inertia of Pipe18STD? Ix = 756 in⁴ about the strong axis and Iy = 756 in⁴ about the weak axis. The radius of gyration is rx = 6.24 in and ry = 6.24 in.
Related Pages
Educational reference only. Verify all section properties against the current AISC Manual and mill certificates before design. Results are PRELIMINARY — NOT FOR CONSTRUCTION.