CHS 70x18 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 70x18 steel profile weighs 23.1 kg/m (15.51 lb/ft). Cross-sectional area: 2,940.531 mm². Moment of inertia Ix = 111.299 cm⁴, Iy = 111.299 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	18 mm	0.71 in
Diameter (d)	70 mm	2.76 in
Weight	23.1 kg/m	15.51 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	2,940.53 mm²	4.558 in²
Moment of inertia (Ix)	111.3 cm⁴	2.67 in⁴
Moment of inertia (Iy)	111.3 cm⁴	2.67 in⁴
Elastic section modulus (Sx)	31.8 cm³	1.941 in³
Elastic section modulus (Sy)	31.8 cm³	1.941 in³
Plastic section modulus (Zx)	50.62 cm³	3.089 in³
Plastic section modulus (Zy)	50.62 cm³	3.089 in³
Radius of gyration (rx)	1.95 cm	0.766 in
Radius of gyration (ry)	1.95 cm	0.766 in