CHS 73x18 GOST · Weight & Dimensions

GOST, cold-formed sections · Circular Hollow Section

Circular Hollow Sections (CHS) are round tubular profiles with the most efficient cross-section for compression. Used for columns, trusses, and architectural structures.

Also known as: Caño estructural redondo (Argentina)

The CHS 73x18 steel profile weighs 24.4 kg/m (16.40 lb/ft). Cross-sectional area: 3,110.177 mm². Moment of inertia Ix = 130.2 cm⁴, Iy = 130.2 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	18 mm	0.71 in
Diameter (d)	73 mm	2.87 in
Weight	24.4 kg/m	16.40 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	3,110.18 mm²	4.821 in²
Moment of inertia (Ix)	130.2 cm⁴	3.13 in⁴
Moment of inertia (Iy)	130.2 cm⁴	3.13 in⁴
Elastic section modulus (Sx)	35.67 cm³	2.177 in³
Elastic section modulus (Sy)	35.67 cm³	2.177 in³
Plastic section modulus (Zx)	56.39 cm³	3.441 in³
Plastic section modulus (Zy)	56.39 cm³	3.441 in³
Radius of gyration (rx)	2.05 cm	0.806 in
Radius of gyration (ry)	2.05 cm	0.806 in