Amine Stress Corrosion Cracking||API571||DAMAGE MECHANISM скачать в хорошем качестве

Amine Stress Corrosion Cracking||API571||DAMAGE MECHANISM

Amine Stress Corrosion Cracking Description of Damage a) Amine SCC (or amine cracking) is the cracking of steels under the combined action of tensile stress and an aqueous alkanolamine solution used to remove (absorb) H2S and/or CO2 and their mixtures from various gas and liquid hydrocarbon streams. b) Amine cracking is a form of alkaline stress corrosion cracking (ASCC). c) It is most often found at or adjacent to non-postweld-heat-treated (non-PWHT) carbon steel welds or in highly cold worked parts. d) Amine cracking should not be confused with several other types of SCC that can occur in amine environments, which are further described in 3.66 and 3.12. Affected Materials Carbon steel and low-alloy steels Critical Factors a) The critical factors are the level of tensile stress, the type of amine, and temperature. b) Increasing stress level increases the likelihood and severity of cracking. Cracking is most often associated with high residual stresses from welding or cold working that have not been removed by an effective stress relieving heat treatment.