W 990 x 320,9 Arval · Weight & Dimensions

Arval, hot-rolled 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: IPR 990 x 320,9 (México) · Doble T 990 x 320,9 (Argentina / LATAM) · UB 990 (UK / Australia)

The W 990 x 320,9 steel profile weighs 320.9 kg/m (215.65 lb/ft), has a depth of 990 mm (38.98 in), flange width 400 mm (15.75 in). Cross-sectional area: 40,884.567 mm². Moment of inertia Ix = 696,446.443 cm⁴, Iy = 33,121.12 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	990 mm	38.98 in
Width (b)	400 mm	15.75 in
Web thickness (tw)	16.5 mm	0.65 in
Flange thickness (tf)	31 mm	1.22 in
Fillet radius (r)	30 mm	1.18 in
Weight	320.9 kg/m	215.65 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	40,884.57 mm²	63.371 in²
Moment of inertia (Ix)	696,446.44 cm⁴	16732.13 in⁴
Moment of inertia (Iy)	33,121.12 cm⁴	795.73 in⁴
Elastic section modulus (Sx)	14,069.63 cm³	858.585 in³
Elastic section modulus (Sy)	1,656.06 cm³	101.059 in³
Plastic section modulus (Zx)	15,797.28 cm³	964.013 in³
Plastic section modulus (Zy)	2,554.71 cm³	155.899 in³
Radius of gyration (rx)	41.27 cm	16.249 in
Radius of gyration (ry)	9 cm	3.544 in