利用Gleeble-3800热模拟试验机对X80管线钢再结晶终止温度Tnr和CCT曲线进行测定分析，并利用差热分析试验方法确定试验钢的相变温度范围。结果表明：X80管线钢的再结晶终止温度为1 065 ℃，AC1和AC3分别为749 ℃和863 ℃，而钢中析出物大量溶解的温度在1 050 ℃，贝氏体相变温度为483 ℃；从测得的CCT曲线可以看出，针状铁素体形成的冷却速度范围较宽，从10~40 ℃/s冷却速度区间均可获得以针状铁素体为主的组织。上述结论为X80管线钢控轧控冷工艺制定提供依据。
In this paper, recrystallization terminal temperature Tnr and CCT curves of X80 pipeline steel were measured and analyzed by Gleeble-3800 thermal simulation testing machine, and the range of the phase transition temperature was determined with differential thermal analysis method. The results showed that: the recrystallization terminal temperature is 1 065 ℃, Ac1 and Ac3 are 749 ℃ and 863 ℃, a large number of precipitates dissolve when the temperature is 1 050 ℃, bainitic transformation temperature is 483 ℃, it can be seen that from measured CCT curve:the cooling rate range of formation acicular ferrite is wide. The microstructure is acicular ferrite when the cooling rate is 10-40 ℃/s. The conclusions provide the basis to controlled rolling and controlled cooling of X80 pipeline steel.
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