ASTM A36 is the U.S. equivalent of China's Q235, with mechanical properties tailored for general construction:
Yield strength: >=250 MPa (for thickness <=203mm), slightly higher than Q235's 235 MPa, ensuring it resists deformation in building frames.
Tensile strength: 400–550 MPa, with elongation >=20% for ductility during earthquakes or impact.
Impact toughness: Not specified for ambient temperature but requires >=20 J at -10℃ for certain applications, a stricter requirement than Q235.
Weldability: Excellent due to low carbon (0.26% max), making it suitable for welded structures like bridges and warehouses.
While A36 has marginally higher strength than Q235, their properties overlap enough for limited interchangeability. A36 is used in U.S. construction, while Q235 dominates Chinese infrastructure, with both listed on global platforms as "Mild Steel Round Bar for General Structural Use."