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ASM Failure Analysis Case Histories

ASM Failure Analysis Case Histories: Pulp and Paper Processing Equipment

ASM International
ISBN electronic:
978-1-62708-230-3
Publication date:
2019
Book Chapter

Digesters

Published:
2019

Abstract

A neck fitting (cast equivalent of AISI type 317) exhibited extreme corrosion with large, deeply pitted areas. It had been in service in a sulfite digester at 140 deg C (285 deg F) and 689 kPa (100 psi). The liquor was calcium bisulfite, and chloride content was reported to be low. Investigation (visual inspection, and micrographs of sections with electrolytic etching using 10 N KOH and then again after re-polishing and etching with Murakami's reagent) supported the conclusions that the casting never received a proper solution anneal. Recommendations included possible corrosion-screening tests in accordance with ASTM A 262 to ensure adequate corrosion resistance.

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2019. "Digesters", ASM Failure Analysis Case Histories: Pulp and Paper Processing Equipment

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