In this study, the effect of final cooling temperature on hydrogen induced cracking (HIC) resistance and mechanical properties of Ce-treatment high vanadium X80 pipeline steel has been investigated. The results show that as the final cooling temperature decreased from 880 °C to 560 °C, 460 °C, and 360 °C, the average size, number density, and volume fraction of vanadium precipitates decrease, and the microstructure transforms from polygonal ferrite + degenerate pearlite to acicular ferrite + granular bainite, granular bainite + bainitic ferrite, and bainitic ferrite + martensite, respectively. The changes in the microstructure are the main reason for the variations in the HIC resistance and mechanical properties of tested steels. Selecting a reasonable final cooling temperature (460 °C∼560 °C in this study) to form a microstructure dominated by granular bainite + bainitic ferrite or acicular ferrite + granular bainite can obtain X80 grade pipeline steel that meets the service standards in acidic environments and mechanical property requirements.
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