采用Gleeble热模拟试验机和光学金相显微镜研究了X80钢连续冷却条件下的组织及其转变规律。实验结果表明:随冷却速度的提高,X80管线钢组织由多边状、准多边状铁素体逐渐转为贝氏体类组织。其中以20～30℃/s速度冷却时获得的组织以典型的细小、均匀针状铁素体类型为主;组织中含有一定数量的细小M/A岛弥散分布于铁素体晶粒内部的板条界上,这种组织结构有利于获得高强度与高韧性。 The microstructure and transformation of X80 steel under continuous cooling condition were studied by Gleeble thermal simulator and optical microscope. The experimental results show that with the increase of cooling rate, the microstructure of X80 pipeline steel gradually changes from polygonal to quasi-polygonal ferrite to bainite. The microstructure of the microstructure obtained by the cooling at 20-30 ℃ / s is dominated by the typical fine and uniform acicular ferrite. The microstructure contains a certain number of fine M / A islands dispersed within the ferrite grains On the lath sector, this structure is conducive to high strength and high toughness.