Stress corrosion cracking: The cracking method that erupts below the data yield point and weak corrosive medium under the combined action of stress and corrosive media.

Stress corrosion cracking: Stress corrosion cracking 6. Embrittlement of σ phase The σ phase is a brittle and non-magnetic intermetallic compound phase with variable composition and complex crystal structure.

Embrittlement: When the 25-20 steel weld is heated at 800-875°C, the γ-to-σ transition is very severe.

In swinging austenitic steel welds, nickel and nitrogen, the austenitizing elements, can be increased to suppress σ embrittlement.