Abstract The effect of acicular ferrite (AF) microstructure composition of different phases on the strength of X65 pipeline steel was investigated by varying thermo-mechanical control process (TMCP) parameters to the steel. Experimental results showed that lowering the finish rolling temperature or increasing the cooling rate was in favor of formation of the granular ferrite and the bainite ferrite in AF microstructure, thus obviously increasing the strength of the steel. Enhancing the coiling temperature could accelerate the perception strengthening, also in favor of the strength for the steel. However, lowering the finish rolling temperature made the most contribution to the increase of the strength.
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