本发明公开了一种贝氏体型X100级无缝管线管，其微观组织以贝氏体为主，所述贝氏体型X100级无缝管线管的化学元素质量百分比为：C：0.03～0.09％，Si：0.1～0.5％，Mn：1.5％～2.5％，Mo：0.4～1％，Al：0.01～0.1％，余量为Fe和其他不可避免的杂质。相应地，本发明还公开了一种上述的贝氏体型X100级无缝管线管的制造方法。本发明所述的贝氏体型X100级无缝管线管其微观组织以贝氏体为主，强度级别达到X100级，并且焊接裂纹敏感性较低。

The invention discloses a bainite X100-stage seamless line pipe. The microstructure of the bainite X100-stage seamless line pipe is mainly bainite. The bainite X100-stage seamless line pipe is prepared from the following chemical elements in percentage by mass: 0.03 to 0.09% of C (carbon). 0.1 to 0.5% of Si (silicon), 1.5 to 2.5% of Mn (manganese), 0.4 to 1% of Mo (molybdenum), 0.01 to 0.1% of Al(aluminum), the balance of Fe (iron) and unavoidable impurities. The invention also discloses a manufacturing method of the bainite X100-stage seamless line pipe. The bainite X100-stage seamless linepipe has the advantages that the microstructure mainly uses the bainite, the strength reaches X100, and the sensitivity to welding cracks is lower.