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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Stress-Corrosion Cracking of C-Mn Steel in a CO2 Absorber in a Chemical Plant

By
Sushil K. Chauhan
Sushil K. Chauhan
Welding Engineering and Metallurgy Department, Larsen and Toubro Ltd.
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Published:
1992
Page range:
191 - 193

Abstract

The source of cracking in the circumferential weld seam in a JIS-SM50B carbon-manganese steel pipe used in a CO2 absorber was investigated, the absorber had been in service for 18 years. The seam had been weld-repaired twice, and the repair welds had been locally stress relieved. Longitudinal seams in the same vessel, which had been stress relieved in a furnace, showed no tendency toward cracking. The solution passing through the vessel contained CO2-CO-H20, KHCO, and Cl− ions. Nondestructive testing revealed that the cracks originated in the heat-affected zone and propagated into the base metal and weld. Severe branching of the cracks characteristic of stress-corrosion cracking was observed. Microexamination revealed that crack propagation was transgranular further supporting the possibility of stress-corrosion cracking. Simulation tests carried out in the vessel confirmed this mode of cracking. It was recommended that weld seams be furnace heat treated at a temperature of 600 to 640 deg C (1110 to 1180 deg F) for a minimum of 1 h per inch of section thickness.

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Sushil K. Chauhan, 1992. "Stress-Corrosion Cracking of C-Mn Steel in a CO2 Absorber in a Chemical Plant", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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