European IPE (parallel-flange I-beams) align with GB I-beams for common sizes, with minor variances within tolerance:
IPE 200 (EN) vs. GB I20a: IPE 200 (depth 200 mm, flange width 100 mm, web thickness 5.6 mm, weight 27.4 kg/m) vs. GB I20a (depth 200 mm, flange width 100 mm, web thickness 7 mm, weight 27.97 kg/m). The 1.4 mm web difference is within EN/GB's ±0.5 mm tolerance, so IPE 200 fits GB brackets with standard bolts.
IPE 300 (EN) vs. GB I30a: IPE 300 (depth 300 mm, flange width 130 mm, web thickness 7.5 mm, weight 43.2 kg/m) vs. GB I30a (depth 300 mm, flange width 118 mm, web thickness 7.5 mm, weight 43.89 kg/m). Wider IPE flange boosts lateral stability, ideal for long-span applications.
EN 10279's tolerances match GB/T 706, so no major adjustments are needed for substitution.