通过合理的组织、成分设计，在实验室试制成功X100管线钢。利用光学显微镜、透射电镜与背散射电子衍射技术（EBSD），研究了X100钢不同组织构成对力学性能的影响规律及其合理的控冷制度，并通过Gleeble1500热模拟机获得了试验钢的CCT曲线。结果表明，少量AF（Acicular Ferrite）、GB（Granular Bainite）组织的出现，可使原奥氏体晶粒得到分割，抑制板条束的过分长大，使板条贝氏体束的有效晶粒尺寸得到显著细化，钢板具有最优的细化组织，塑韧性得到明显改善；冷却速度为20～25 ℃/s，终冷温度为380 ℃时，钢板可获得最佳的组织构成与最优的综合力学性能，屈服强度为775 MPa，抗拉强度为855 MPa，伸长率为16.6%，冲击功（-20 ℃）为218 J。
By proper composition and microstructure designing, the test X100 pipeline steels were prepared successfully in lab.The effect of microstructure on mechanical properties was studied with OM, TEM , EBSD analysis, and continuous cooling transformation curves were obtained with Gleeble-1500 thermomechanical simulator. The result indicates, the specimen rolled with final cooling temperature of about 380 ℃ and cooling speed of 20-25 ℃/s consists of lath like bainite, granular bainite and acicular ferrite,and has optimum microstructure and excellent integrated mechanical properties:ReL＝775 MPa, Rm＝845 MPa,A＝16.6%,AKV(-20 ℃)＝218 J.
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