EN 10025-2 mandates Charpy V-notch impact testing for S355JR UPE/UPN channels, with criteria based on the "JR" suffix:
Test temperature: +20°C
Minimum impact energy: 27 JThis ensures toughness for moderate climates (e.g., Western Europe). For cold regions (e.g., Scandinavia), S355J0 (tested at 0°C) or S355J2 (tested at -20°C) are used, both requiring 27 J minimum energy. Impact testing prevents brittle fracture-critical for channels in snow-prone or seismic areas. Tests follow EN 10045-1, with specimens cut from the flange or web. Results are included in material certificates, and batches failing the test are rejected. For critical applications (e.g., nuclear facilities), higher energy (40 J+) may be specified.