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Evaluation of the Ductile Tearing Characteristics of Ex-Service ASTM A106 Grade B Carbon Steel in High Temperature Hydrogen

High temperature hydrogen attack (HTHA) is a documented threat to the integrity of refinery piping. Historically the threat of HTHA has been dealt with by operating in “safe” combinations of temperature and hydrogen pressure. However HTHA has been identified in piping operating in regions that were previously defined as safe. Operator experience with C-0.5Mo has varied indicating the factors controlling susceptibility to HTHA are not well understood.A test program was recently conducted to test ex-service material using the fracture toughness test technique. The ex-service material was tested in two different states; natural damage with a crack and undamaged. Testing was conducted in at elevated temperature and with and without hydrogen. After testing the fracture morphology and extent of hydrogen damage was documented using a scanning electron microscope. The test methodology and results are discussed in this paper.

Product Number: 51319-13528-SG
Author: Brandon Rollins
Publication Date: 2019
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