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99284 CAUSTIC STRESS CORROSION CRACKING SUSCEPTIBILITY IN CONTINUOUS KRAFI’ DIGESTERS DUE TO PROCESS LOADINGS

Picture for 99284 CAUSTIC STRESS CORROSION CRACKING
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Product Number: 51300-99284-SG
ISBN: 99284 1999 CP
Author: Heikki Leinonen
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Loads of the continuous kraft digester have been determined during the start-up of the digester house. Loading was caused by the pressure of the proof test, the start-up pressures of the digester and, finally, the normal working pressure. The apparent threshold stress level in the base metal was greater than that achieved during the normal continuous cooking process but the level in the weld of the impregnation zone were exceeded due to the superposition of the tensile residual stresses. This twoaxial tension is considered as the precondition for stress corrosion cracking (SCC), which was confirmed by fractography studies. The results showed, that SCC in the impregnation zone is possible only in the welds during the normal continuous cooking process. During the refill and blow phase of the digester the measured loading stress changes corresponded to the stresses of the proof test and increased the risk for SCC. Some procedures to avoid or minimize SCC are discussed.
Loads of the continuous kraft digester have been determined during the start-up of the digester house. Loading was caused by the pressure of the proof test, the start-up pressures of the digester and, finally, the normal working pressure. The apparent threshold stress level in the base metal was greater than that achieved during the normal continuous cooking process but the level in the weld of the impregnation zone were exceeded due to the superposition of the tensile residual stresses. This twoaxial tension is considered as the precondition for stress corrosion cracking (SCC), which was confirmed by fractography studies. The results showed, that SCC in the impregnation zone is possible only in the welds during the normal continuous cooking process. During the refill and blow phase of the digester the measured loading stress changes corresponded to the stresses of the proof test and increased the risk for SCC. Some procedures to avoid or minimize SCC are discussed.
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