I Section

Height (H): Commonly from 100mm to 900mm, up to 1000mm.
Flange width (B): Commonly from 50mm to 400mm.

European Standard (EN)
EN 10025-1~6 "Hot-rolled structural steel products" (specify material grades such as S235, S355);
EN 10034:1993 "H and I-beams for structures - Dimensional and shape tolerances".

American Standard (ASTM)
ASTM A6/A6M "General requirements for rolled steel plates, steel sections, sheet piles and bars for structures";
ASTM A992/A992M "Standard Specification for Structural Steel Sections" (most commonly used, replacing ASTM A36).

Japanese Standard (JIS)
JIS G 3192:2014 "Dimensions, weights and permissible deviations of hot-rolled H-beams".


International Standard (ISO)
ISO 657-1:1989 "Hot-rolled steel sections - Part 1: H-beams, I-beams".

Ordinary I-beam
Lightweight I-beam

Building structure:
Main beams, secondary beams (bearing floor and roof loads)
Columns (bearing vertical loads and lateral forces)
Roof trusses and crane beams of factory buildings
Frame structures of high-rise buildings

Bridge structures: Main beams, cross beams, and piers of bridges (especially steel bridges).

Industrial structures: Equipment platforms, brackets, conveyor trestles, large storage tank brackets, and mine tunnel supports.

Machinery manufacturing: Metal structures of bases, racks, and lifting machinery (such as cranes) of large equipment.

Temporary structures: Support frames and formwork support systems for construction.

Foundation engineering: Piles (such as H-shaped steel piles).