Isothermal decomposition of supercooled austenite in spring steels
Alloying of steel 55S2 with mangaense and molybdenum, and also manganese and vanadium, increases the stability of supercooled austenite and lowers the critical cooling rate. Additional alloying with cerium has a similar effect.
The stability of supercooled austenite is highest in steels 55S2GM4 and 55S2GM. The temperature of the minimal stability of austenite is 50–1000 lower.