I 1800x550x20x45 CISC · Weight & Dimensions

CISC, 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: I 1800x550x20x45 (México) · Doble T I 1800x550x20x45 (Argentina / LATAM) · UB 1800 (UK / Australia)

The I 1800x550x20x45 steel profile weighs 657.0 kg/m (441.54 lb/ft), has a depth of 1800 mm (70.87 in), flange width 550 mm (21.65 in). Cross-sectional area: 83,700 mm². Moment of inertia Ix = 4,645,734.75 cm⁴, Iy = 124,895.25 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	1800 mm	70.87 in
Width (b)	550 mm	21.65 in
Web thickness (tw)	20 mm	0.79 in
Flange thickness (tf)	45 mm	1.77 in
Weight	657.0 kg/m	441.54 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	83,700 mm²	129.735 in²
Moment of inertia (Ix)	4,645,734.75 cm⁴	111613.78 in⁴
Moment of inertia (Iy)	124,895.25 cm⁴	3000.61 in⁴
Elastic section modulus (Sx)	51,619.28 cm³	3150.015 in³
Elastic section modulus (Sy)	4,541.65 cm³	277.149 in³
Plastic section modulus (Zx)	58,056.75 cm³	3542.855 in³
Plastic section modulus (Zy)	6,977.25 cm³	425.780 in³
Radius of gyration (rx)	74.5 cm	29.331 in
Radius of gyration (ry)	12.22 cm	4.809 in