Two core EN standards regulate I-beams matching GB/T 706 (GB's hot-rolled I-beam standard):
EN 10025-2:2004: Material requirements for structural steels (S355JR for Q355B, S235JR for Q235B), specifying strength, toughness, and chemistry.
EN 10279:2000: Dimensional tolerances and shape specs for hot-rolled I-beams (IPE/IPN profiles), mirroring GB/T 706's depth (±1.5 mm for 200–300 mm) and flange width (±1.0 mm for 100–200 mm) tolerances.
Together, these standards ensure European I-beams meet GB material and size requirements, enabling seamless integration into Chinese designs.