EN 10250-2 (EU) and GB/T 12363-2009 (China) regulate open-die forged round bars (used for large, custom components) with key differences:
Size range: EN covers diameters 100–1000mm, while GB/T 12363 extends to 1200mm, catering to China's demand for mega-machinery parts.
Heat treatment: EN mandates normalization for all grades, while GB/T 12363 allows annealing or quenching/tempering based on application needs.
Mechanical properties: EN 10250-2 C45 requires 600–750 MPa tensile strength, matching GB/T 12363 45#'s 600–700 MPa, but EN specifies stricter impact toughness (-20°C ≥27 J vs. GB's 20°C ≥27 J).
Applications: EN bars are used in EU heavy machinery (e.g., turbine rotors), while GB/T 12363 bars dominate Chinese forging projects like ship propeller shafts.