ASM Failure Analysis Case Histories: Pulp and Paper Processing Equipment
Failure of a Stainless Steel Black Liquor Feed Pipe
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Published:2019
Abstract
An 8 in. diam stainless steel black liquor feed pipe to a carbon steel digester had failed within one year of service. The material was type 316 molybdenum-containing austenitic stainless steel. The service environment was alkaline black liquor at 175 deg C (350 deg F). The pipe had developed cracks on the inside surface coincident with an external support gusset. The cracks initiated at wide corrosion grooves. The early stages were corrosion-assisted fatigue cracks. The cracks initiated at the corrosion grooves and propagated as transgranular SCC with characteristic branching. Evaluation indicated the cracks were localized in an area of...
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Member Sign InD. G. Chakrapani, Failure of a Stainless Steel Black Liquor Feed Pipe, ASM Failure Analysis Case Histories: Pulp and Paper Processing Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.pulp.c9001564
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