Using methods of NACE H2S saturation solution and wave impacting test, the relativity between hydrogen craze and impacting tenacity of pipeline steel was discussed and analyzed. The results show that the HIC samples have no way to express the tenacity after dipping in the solution of NACE saturation H2S solution under the condition of impacting tenacity at larger stress rate. There is no obvious change no matter what recoverable strain work, cracking spreading work and the whole work. It is suggested that e...