Key European standards for round steel are:
1) EN 10025-2: For hot-rolled structural round steel (grades S235JR/S355JR, equivalent to Q235B/Q355B), specifying yield strength (235MPa/355MPa) and impact toughness (≥27J at 0℃);
2) EN 10080: For cold-finished round steel (precision grades), with tolerance classes (e.g., h8 for Φ20, tolerance ±0.021mm) and surface finish (Ra ≤0.8μm);
3) EN 10088-1: For stainless steel round steel (e.g., 1.4301=304, 1.4401=316), covering corrosion resistance requirements;
4) EN 10277-1: For bright steel round steel (cold-drawn, polished), used in high-precision parts (e.g., bearings). EN standards require mandatory inspection reports (EN 10204 Type 3.1) for critical applications (aerospace, medical).