CHS 70x3 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 70x3 steel profile weighs 5.0 kg/m (3.33 lb/ft). Cross-sectional area: 631.46 mm². Moment of inertia Ix = 35.504 cm⁴, Iy = 35.504 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3 mm ≈ 11 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3 mm	0.12 in
Diameter (d)	70 mm	2.76 in
Weight	5.0 kg/m	3.33 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	631.46 mm²	0.979 in²
Moment of inertia (Ix)	35.5 cm⁴	0.85 in⁴
Moment of inertia (Iy)	35.5 cm⁴	0.85 in⁴
Elastic section modulus (Sx)	10.14 cm³	0.619 in³
Elastic section modulus (Sy)	10.14 cm³	0.619 in³
Plastic section modulus (Zx)	13.48 cm³	0.822 in³
Plastic section modulus (Zy)	13.48 cm³	0.822 in³
Radius of gyration (rx)	2.37 cm	0.934 in
Radius of gyration (ry)	2.37 cm	0.934 in