CHS 70x9 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 70x9 steel profile weighs 13.5 kg/m (9.10 lb/ft). Cross-sectional area: 1,724.734 mm². Moment of inertia Ix = 81.968 cm⁴, Iy = 81.968 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	9 mm	0.35 in
Diameter (d)	70 mm	2.76 in
Weight	13.5 kg/m	9.10 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,724.73 mm²	2.673 in²
Moment of inertia (Ix)	81.97 cm⁴	1.97 in⁴
Moment of inertia (Iy)	81.97 cm⁴	1.97 in⁴
Elastic section modulus (Sx)	23.42 cm³	1.429 in³
Elastic section modulus (Sy)	23.42 cm³	1.429 in³
Plastic section modulus (Zx)	33.73 cm³	2.058 in³
Plastic section modulus (Zy)	33.73 cm³	2.058 in³
Radius of gyration (rx)	2.18 cm	0.858 in
Radius of gyration (ry)	2.18 cm	0.858 in