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Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment.It can lead to unexpected sudden failure of normally ductile metals subjected to a tensile stress, especially at elevated temperature in the case of metals.s one of the requirements for stress corrosion cracking is the presence of stress in the components, one method of control is to eliminate that stress, or at least reduce it below the threshold stress for SCC.
It can happen at atmospheric liquid ammonia conditions at -33 Â°C, but also at higher temperatures under pressurized ammonia conditions. Also tanks for transporting liquid ammonia, like rail tank cars, tank cars, barges and vessels can be susceptible to stress corrosion cracking.It is difficult to repair SCC damage.Often complete replacement of the equipment (like a new tank) is necessary when SCC is found.The presence of oxygen (air) and residual stress are the causes for forming SCC cracks. Therefore the ingress of air into ammonia containing equipment must be prevented.t is difficult to repair SCC damage. Often complete replacement of the equipment (like a new tank) is necessary when SCC is found.The presence of oxygen (air) and residual stress are the causes for forming SCC cracks. Therefore the ingress of air into ammonia containing equipment must be prevented.