A355K2G3 flange forging

S355K2G3 is a structural steel for hot forging in the European standard (EN 10222-5:2006), belonging to the category of low-alloy high-strength steel. It is mainly used to manufacture forged parts subject to high loads, such as flanges, gears, and shafts. The meanings of each symbol in its designation are as follows:

S: Structural steel (structural steel)
355: Minimum yield strength of 355 MPa (when the thickness ≤ 16 mm)
K2: Indicates that the material must meet impact toughness requirements (impact energy ≥ 27J at -20°C, specific test conditions are specified in the standard)
G3: Smelting process requirements (rimmed steel, semi-killed steel, or killed steel; here it refers to killed steel with high purity)