The Effects of Operational, Testing, and Material Characterizations on the Change in Yield Strength From Plate to Pipe

The rapid growth of energy consumption has increased the demand of pipelines for the transportation of oil and gas. UOE is one common technique for manufacturing pipes, and its pipe products are evaluated by tensile tests after cutting and flattening the specimen. The mechanical performance of the pipe sample has a direct influence on their application and a significant economic impact on manufacturers. There is often a change in the yield strength from plate to pipe. This work sets out to provide a critical knowledge base for this change, with emphasizing the important influence of the plate mechanical properties on the pipe so that the quality of pipe can be further ensured. In the work, first, the historical data of the pipe yield strength were collected and plotted to provide an overall insight and a quantitative review on change of the pipe yield strength. Second, an experimentally validated finite element model of the pipe forming and mechanical testing was explained. Finally, using the validated Finite Element model, a parametric study was conducted to determine the individual role that each plate material parameter plays on changing the pipe yield strength. We found that the pipe yield strength can differ significantly by varying the plate properties. This work sheds lights on the desired plate mechanical properties to optimize the final pipe yield strength.