Strain aging on the yield strength to tensile strength ratio of UOE pipe

• Author(s) / Creator(s)

  • Wiskel, J.B.
  • Ma, J.
  • Valloton, J.
  • Ivey, D.G.
  • Henein, H.

• Strain aging of microalloyed steel pipe can occur at the relatively low temperatures associated with the pipe coating process and/or during long term storage. A Box-Behnken statistical design is used to determine the significant strain aging variables that affect the longitudinal yield strength to tensile strength (Y/TS) ratio for three uncoated X70 UOE pipes. The strain aging variables examined include time, temperature, steel composition/microstructure (vis-a-vis the C/Nb ratio) and position through the pipe wall thickness. Metallographic and EBSD examinations were undertaken to determine the grain size and phase percentages of the as-received pipe steel. Both position in the pipe and C/Nb ratio were found to have a statistically significant effect on the yield strength to tensile strength ratio.

• Date created

  2016-09-01

• Subjects / Keywords

  • Microalloyed Steel
  • Box-Behnken
  • Tensile Properties
  • Strain Aging

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/R3862BT7F

• License

  Attribution-NonCommercial-NoDerivatives 4.0 International