Angle steel (L-shaped) dimensions vary by region:
China (GB/T 9787):
Equal-leg: ∠50×50×5 (50mm leg, 5mm thickness), Q235 grade.
Unequal-leg: ∠100×80×8 (100mm×80mm, 8mm thickness).
US (ASTM A36):
Equal-leg: 3×3×1/4 in (76×76×6mm), A36 grade.
Unequal-leg: 4×3×3/8 in (102×76×10mm).
Europe (EN 10056):
Equal-leg: L70×70×6 (70×70×6mm), S235 grade.
Unequal-leg: L125×80×10 (125×80×10mm).
Japan (JIS G3192):
Equal-leg: L65×65×5 (65×65×5mm), SS400 grade.
Key note: Chinese standards prioritize cost-efficient Q235 for infrastructure, while US angles suit heavy-duty uses with wider thicknesses.