Preliminary results of ongoing crack growth studies being performed on an API X-65 line pipe steel in a low-pH cracking environment were reported. Objectives were to reproduce low-pH crack propagation in the laboratory, to identify a crack driving force parameter, and to evaluate the influence of environmental and mechanical parameters on crack growth A J-integral test technique was used in the study. Significant crack growth was observed. The parameter J appeared to be a good driving force parameter to describe crack growth.

Subject
Environmental cracking, Crack growth, Piping, Fracture surfaces, Pipelines, Crack propagation, Transgranular stress corrosion cracking, Stress cracking, Crack velocity, Steel, Electric potential, Carbonate stress corrosion cracking, Electrolytes
Keywords:
crack propagation, fracture mechanics, J-integral, pH, line pipe steel, pipelines, stress corrosion cracking
NACE International
1993
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