Square and Rectangular Tube Weight
Square and rectangular steel tubing, classified as Hollow Structural Sections (HSS), is used in frames, handrails, and columns. Sizing the weight of HSS profiles requires subtracting the inner hollow volume from the outer bounding volume.
To calculate HSS weight, subtract the inner volume (based on wall thickness) from the outer volume, then multiply by density. The formula is:
$$\text{Weight per Foot (lbs)} = 3.4 \times (\text{Outer Perimeter (in)} - 4.5 \times \text{Thickness (in)}) \times \text{Thickness (in)}$$
This formula accounts for corner radius profiles. Verify tube sizing and weights on the steel weight calculator.
Tubes provide high torsional strength, making them ideal for chassis and frames where forces are applied from multiple angles.
Frequently Asked Questions
Understanding Rolling Tolerances and Steel Chemistry
Calculating the weight of structural steel profiles relies on standard density equations. However, manufacturing variables can lead to minor differences between theoretical and actual weights. Steel plates and beams are manufactured under rolling tolerances, which permit minor thickness variances along the length of the profile. Standard structural shapes (like hot-rolled I-beams) have safety margins of up to 5% due to these manufacturing limits.
Additionally, alloy composition affects material density. Standard carbon steel has a nominal density of 7.85 g/cm³, whereas stainless steel grades (like Grade 304 or 316) vary slightly due to chromium and nickel additions. Accounting for these tolerances ensures structural safety and keeps construction shipping costs aligned with expectations.