CHS 203x18 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 203x18 steel profile weighs 82.1 kg/m (55.18 lb/ft). Cross-sectional area: 10,461.504 mm². Moment of inertia Ix = 4,517.931 cm⁴, Iy = 4,517.931 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	18 mm	0.71 in
Diameter (d)	203 mm	7.99 in
Weight	82.1 kg/m	55.18 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	10,461.5 mm²	16.215 in²
Moment of inertia (Ix)	4,517.93 cm⁴	108.54 in⁴
Moment of inertia (Iy)	4,517.93 cm⁴	108.54 in⁴
Elastic section modulus (Sx)	445.12 cm³	27.163 in³
Elastic section modulus (Sy)	445.12 cm³	27.163 in³
Plastic section modulus (Zx)	617.99 cm³	37.712 in³
Plastic section modulus (Zy)	617.99 cm³	37.712 in³
Radius of gyration (rx)	6.57 cm	2.587 in
Radius of gyration (ry)	6.57 cm	2.587 in