本文研究了在不同控轧控冷工艺（TMCP）条件下X65级管线钢中针状铁素体复相组织中的各相组成及其对材料强度的影响。研究结果表明，降低终轧温度或提高冷速，均有利于针状铁素体复相组织中的粒状铁素体、贝氏体铁素体等低温组织的形成，可显著提高管线钢的强度。提高卷取温度可增强沉淀析出效果，也有利于管线钢强度的提高。降低终轧温度对强度提高的贡献最大。
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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