采用TMCP(热机械控制处理)工艺制造的高Nb成分X80管线钢板,在实验室进行了不同加热温度下的离线热处理试验研究,分析了轧后加热温度对高Nb管线钢组织性能的影响规律.结果表明:钢板在150～600℃温度范围内热处理时,钢板的显微组织、强度及DWTT(Drop Weight Tear Test,落锤撕裂试验)性能无显著变化,韧脆转变温度略有上升；650℃加热处理后,钢板的显微组织粗化、韧脆转变温度上升,DWTT性能明显下降.
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