EN 10083-2 (EU) and GB/T 699 (China) govern non-alloy structural round bars with overlapping scope but regional differences:
Grade equivalence: EN 10083-2 C45 ≈ GB/T 699 45#, with similar carbon content (0.42–0.50% C) and tensile strength (600–700 MPa).
Chemistry controls: EN 10083-2 allows lower manganese (≤0.60% for C15) than GB/T 699 (0.35–0.65% for 15#) but stricter sulfur limits (≤0.035% vs. ≤0.035% for premium grades).
Mechanical testing: Both require tensile and bend tests, but EN 10083-2 mandates impact testing at -20°C for "NL" grades (e.g., C45NL), while GB/T 699 focuses on ambient-temperature performance.
Applications: EN 10083-2 bars are used in EU machinery and automotive, while GB/T 699 bars dominate Chinese manufacturing, with cross-acceptance in global projects via third-party certification.