Regional standards reflect diverse engineering priorities:
Flange Characteristics:
US W-shapes: Parallel flanges (e.g., W14×90) for heavy loads, flange width up to 610mm.
Chinese I-beams: Tapering flanges (1:6 slope) for cost efficiency, e.g., No. 20 (200×100×7mm).
European IPE: Slim flanges (e.g., IPE300: 300×150×4.5mm) for lightweight designs.
Height Range:
China: 100–630mm (No. 10–No. 63).
US: 100–1,200mm (W4–W48).
Europe: 100–600mm (IPE100–IPE600).
Tolerance Requirements:
Japanese standards enforce ±0.5mm for flange width; Chinese GB allows ±1mm to facilitate mass production for infrastructure projects.