What American angle grade is the direct equivalent of China’s Q355B?

The direct American equivalent of GB Q355B angles is ASTM A992 (per ASTM A992/A992M). Both grades have a minimum yield strength of 345 MPa (50 ksi) for all sections, matching Q355B's 355 MPa (≤16 mm) and 345 MPa (16–40 mm) yield strength. Tensile strength overlaps (A992: 448–586 MPa; Q355B: 470–630 MPa), ensuring identical load capacity. Chemically, A992 has carbon (max 0.23%), manganese (1.00–1.65%), phosphorus (max 0.035%), and sulfur (max 0.035%)-nearly identical to Q355B. For cold climates, A992's 20 ft-lb (27 J) impact energy at -20°C aligns with Q355B's 34 J at 0°C, making it a reliable substitute for structural applications like building frames or bracing.