L51604 Ductile Fracture Properties of Selected Line Pipe Steels

The objective of this report is to present the ductile fracture properties needed to assess stable flaw growth. These properties are presented following a brief discussion of the analysis method being developed to provide the gas industry with an accurate and validated model for predicting growth of a flaw due to the effects of a hydrostatic test or hydrostatic retesting. The end product will be a validated model that predicts crack extension during the load and hold portion of a hydrotest, and subsequent operation.

Test methods to develop these properties are presented along with discussion of data analysis. Results are presented for three line-pipe steels for the LT (through-wall axial flaw) orientation, for three levels of prestrain.