CS 550x345 Usiminas · Weight & Dimensions

Usiminas, welded sections · Wide Flange (I-beam)

Wide flange beams (W shapes / I-beams) are the most common structural steel profile used in building construction. They are used for beams, columns, and girders in steel-framed buildings and bridges. Designed per AISC 360, Eurocode 3, and NBR 8800.

Also known as: CS 550x345 (México) · Doble T CS 550x345 (Argentina / LATAM) · UB 550 (UK / Australia)

The CS 550x345 steel profile weighs 344.6 kg/m (231.58 lb/ft), has a depth of 550 mm (21.65 in), flange width 550 mm (21.65 in). Cross-sectional area: 43,903 mm². Moment of inertia Ix = 251,458.818 cm⁴, Iy = 87,374.711 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	550 mm	21.65 in
Width (b)	550 mm	21.65 in
Web thickness (tw)	19 mm	0.75 in
Flange thickness (tf)	31.5 mm	1.24 in
Weight	344.6 kg/m	231.58 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	43,903 mm²	68.050 in²
Moment of inertia (Ix)	251,458.82 cm⁴	6041.30 in⁴
Moment of inertia (Iy)	87,374.71 cm⁴	2099.18 in⁴
Elastic section modulus (Sx)	9,143.96 cm³	558.001 in³
Elastic section modulus (Sy)	3,177.26 cm³	193.889 in³
Plastic section modulus (Zx)	10,109.57 cm³	616.926 in³
Plastic section modulus (Zy)	4,808.33 cm³	293.423 in³
Radius of gyration (rx)	23.93 cm	9.422 in
Radius of gyration (ry)	14.11 cm	5.554 in