Paper Title:
Research on the Accurate Control of Initial and Finishing Cooling Temperatures for X70 Pipeline Steels
  Abstract

Different cooling parameters, including the initial cooling temperature, finishing cooling temperature and cooling rate, have a significant effect on the final microstructures and properties for pipeline steels. In present work, Gleeble-1500 thermal-mechanical simulator was used to investigate the microstructural evolution of X70 pipeline steels under different cooling conditions, and the microstructures obtained were analyzed using optical microscope and transmission electron microscope. The experimental results showed that when the initial and finishing cooling temperatures are controlled in the range of 740~760°C and 500~520°C respectively, the microstructure of X70 pipeline steels reveals a proper content (about 12%) of pre-eutectoid ferrite besides acicular ferrite and M/A (Martensite/Austenite) island, which can guarantee an optimum combination of strength and ductility. In contrast to the conventional way using CCT curve, this methodology shows a higher accuracy and operability, and used in industrial production to achieve good effect.

  Info
Periodical
Materials Science Forum (Volumes 575-578)
Edited by
Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou
Pages
1038-1043
DOI
10.4028/www.scientific.net/MSF.575-578.1038
Citation
T. Niu, H. Yu, Y. L. Kang, M. J. Long, "Research on the Accurate Control of Initial and Finishing Cooling Temperatures for X70 Pipeline Steels", Materials Science Forum, Vols. 575-578, pp. 1038-1043, 2008
Online since
April 2008
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