Information on trends pipeline I simply say with the increasing demand for oil and natural gas, delivery pressure and diameter pipelines are constantly increasing, in order to increase the efficiency of its delivery. Taking into account the stability and security of the pipeline structure, the need to increase and improve the strength of the pipe wall thickness, and thus serves as the conduit of such pipeline specifications are thick and high strength toward the direction of development. Due to the compressibility of gas, and thus to pipeline delivery pressure higher than pipeline. In recent years, the majority of foreign pressure gas pipeline from the early 4.5 ~ 6.4MPa increased to 8.0 ~ 12MPa, some pipelines can reach 14 ~ 15.7MPa, so that the pipeline steel grade accordingly increase. Currently, foreign large-diameter pipeline has been widely used steel grade X70, X80 began to enter the small-scale use of the stage, X100 also successfully developed and begin developing X120. Transport sour natural gas pipeline steel has been able to produce the X65 grade steel.