ASTM A675 (USA) and GB/T 702 (China) cover hot-rolled carbon round bars with these mechanical property differences:
Tensile strength ranges: ASTM A675 Grade 60 specifies 415–550 MPa, while GB/T 702 Q235 has 375–500 MPa-reflecting slightly higher strength requirements in ASTM.
Elongation: ASTM requires ≥22% for Grade 60 (diameter ≤25mm), compared to Q235's ≥26%-prioritizing strength over ductility in ASTM.
Impact testing: ASTM A675 is silent on impact properties, while GB/T 702 includes optional impact testing for Q235D (-20°C).
Applications: ASTM A675 is used in U.S. machinery components, while GB/T 702 Q235 dominates Chinese construction, with both meeting industry-specific needs.