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PRCI Report 192
- Mechanical Behavior of Selected Line Pipe Steels
- Report / Survey by Pipeline Research Council International, 09/01/1990
- Publisher: PRCI
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L51624e
Battelle Memorial Institute
Need: Methods to characterize flaw growth in line pipe have evolved with the materials used in pipelines and the technology used to analyze flaw growth. Developments in steel processing and pipeline manufacture have given rise to steels that are very flaw tolerant. Recent steels sustain significant stable flaw growth accompanied by local inelastic straining prior to unstable crack growth. The need for an analysis that can account for the stable flaw growth and inelastic straining in line-pipe applications was recognized and PRCI Line Pipe Supervisory Committee initiated a combined analytical and experimental program to assess the effects of stable flaw growth during hydrotesting.
Benefit: The objective of this report is to present the mechanical properties needed to assess stable flaw growth. These properties involve the usual tensile properties obtained from flattened strap specimens, as well as some properties unique to the analysis of ductile flaw growth. Accordingly, these properties are presented following a brief introduction of the analysis method that has been 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.
Result: Mechanical properties have been developed for an X52 steel and an X70 steel that are typical of commercial American line pipe rolled prior to and early in the 70s. Their tension properties have been compared to an X52 plate steel and another X52 line-pipe steel. Detailed creep-tension and cyclic properties have also been presented for the specific X52 and the X70 steels studied. These properties have been developed in support of the development of a model that can be used to assess ductile flaw growth during hydrotests including the effects of repeated hydrotests and subsequent service. Specific properties required by the J-tearing formulation used for this model have been developed from this data.
Battelle Memorial Institute
Need: Methods to characterize flaw growth in line pipe have evolved with the materials used in pipelines and the technology used to analyze flaw growth. Developments in steel processing and pipeline manufacture have given rise to steels that are very flaw tolerant. Recent steels sustain significant stable flaw growth accompanied by local inelastic straining prior to unstable crack growth. The need for an analysis that can account for the stable flaw growth and inelastic straining in line-pipe applications was recognized and PRCI Line Pipe Supervisory Committee initiated a combined analytical and experimental program to assess the effects of stable flaw growth during hydrotesting.
Benefit: The objective of this report is to present the mechanical properties needed to assess stable flaw growth. These properties involve the usual tensile properties obtained from flattened strap specimens, as well as some properties unique to the analysis of ductile flaw growth. Accordingly, these properties are presented following a brief introduction of the analysis method that has been 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.
Result: Mechanical properties have been developed for an X52 steel and an X70 steel that are typical of commercial American line pipe rolled prior to and early in the 70s. Their tension properties have been compared to an X52 plate steel and another X52 line-pipe steel. Detailed creep-tension and cyclic properties have also been presented for the specific X52 and the X70 steels studied. These properties have been developed in support of the development of a model that can be used to assess ductile flaw growth during hydrotests including the effects of repeated hydrotests and subsequent service. Specific properties required by the J-tearing formulation used for this model have been developed from this data.
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