Stress corosion of AUSTENITIC JIS G4304 SUS 316 stainless steel

AUSTENITIC JIS G4304 SUS 316 stainless steel is damaged in some media for a short period of time when subjected to tensile stress. This crack caused by the combination of stress and corrosive media is called Stress Corrosion Crack. AUSTENITIC JIS G4304 SUS 316 stainless steel is the main product of katalor. Here is a detailed introduction to the stress corrosion of AUSTENITIC JIS G4304 SUS 316 stainless steel.

It is generally believed that stress corrosion is the result of a combination of stress and electrochemical corrosion, and is a slip-dissolution mechanism (also called protective film destruction theory).

The medium causing stress corrosion of AUSTENITIC JIS G4304 SUS 316 stainless steel contains chloride ions (Cl-), which easily cause stress corrosion. As the Cl- concentration increases, the stress corrosion breaking time is shortened. In the slightly acidic FeCl2, MgCl2 solution, oxygen can promote stress corrosion damage. In an acidic medium with a pH of less than 4 to 5, the higher the H+ concentration, the shorter the stress corrosion breaking time. When the pH is greater than 4~5, the addition of NO3-, I- and acetate can inhibit stress corrosion.

The chemical composition and structure of stainless steel also have a strong influence on stress corrosion. Low NiAUSTENITIC JIS G4304 SUS 316 stainless steel is sensitive to stress corrosion, while high nickel steel (Ni content greater than 45%) does not cause stress corrosion. N promotes the induction and propagation of stress corrosion cracks and increases the sensitivity of stress corrosion, while C reduces the stress corrosion sensitivity of AUSTENITIC JIS G4304 SUS 316 stainless steel. AUSTENITIC JIS G4304 SUS 316 stainless steel with a Cr content higher than 12%, the higher the Cr content, the higher the stress corrosion sensitivity. Si improves the stress corrosion resistance of steel in both single-phase austenite and duplex stainless steel. Generally, Si is added in an amount of 2% to 4% (mass fraction). Cu can improve the stress corrosion of AUSTENITIC JIS G4304 SUS 316 stainless steel. If 2% copper is added to 00Cr18Ni10 steel, good stress corrosion resistance can be obtained. Mo shortens the induction period of stress corrosion cracking of AUSTENITIC JIS G4304 SUS 316 stainless steel. P, As, Sb, Bi, Al, etc. all reduce the stress corrosion resistance of AUSTENITIC JIS G4304 SUS 316 stainless steel. Residual S is also detrimental because MnS can be preferentially dissolved and forms a source of cracks. The effects of Ti and Nb are not significant.

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