X120级超高强度管线钢生产工艺研究现状

Recent Research Status of Production Process for Ultra-High-Strength Pipeline Steel X120

X120管线钢的碳含量一般为0.05%,(Cu+Ni+Cr+Mo)≤2%,并加入微合金化元素V、Nb、Ti、B。通过控轧和强控冷工艺,该钢具有高强度、高韧性和良好的焊接性。介绍了生产X120管线钢的在线热处理工艺装置JFE-HOP,间断直接淬火(IDQ),直接淬火DQ-T工艺和淬火-配分(Q&P)工艺技术。讨论了其存在问题和可能的发展方向。

Generally speaking, the carbon content in X120 pipeline steel is 0. 05% , and （ Cu ＋ Ni ＋ Cr ＋ Mo） content in steel ≤2% with adding microalloying elements V, Nb, Ti, B. The steel has high strength, high toughness and nice weldability by control rolling and heavy accelerated cooling process. The in-line heat treatment process device JFE-HOP, the interrupted direct quenching （IDQ） process, the direct quenching DQ-T process and the quenching ＆ partitioning （Q＆P） technology for production of pipeline steel X120 are presented, and the possible existed problem and future development are discussed.