Achieving a TG5 rating depends on several interconnected variables defined by the standard:
Mechanical Properties and Heat Treatment ISO 20457 TG5 defines target ranges for tensile strength, yield strength, elongation, and impact energy after prescribed heat-treatment cycles. Typical processing includes austenitizing at a specified temperature, quenching (oil or controlled-rate cooling), and tempering to achieve the required balance of hardness (measured on Rockwell or Vickers scales) and impact toughness. The standard also provides guidance on permissible hardness gradients, core hardness for through-hardened sections, and post-heat-treatment dimensional tolerances. Iso 20457 Tg5
English