In this tutorial, the external corrosion of a steel pipe is simulated in Abaqus. The pipe is modeled as a three-dimensional solid, with the defect represented as a radial arc on its outer surface. Pipeline corrosion, caused by oxidation and electrochemical breakdown, can occur on both the inner and outer surfaces of pipes exposed to corrosive environments. For this analysis, the steel is modeled with an elastic–plastic material model, and a general static step is used. Internal pressure is applied to the inner surface, and both pipe ends are fixed. A fine mesh is applied for accuracy. The simulation provides results such as stress, strain, defect location, and displacement.