关于输气管道氢致裂纹的研究

An Approach to the SCC of Gas Transmission Pipeline

输气管道用钢氢致裂纹的研究源于两个方面:输送压力的提高,造成硫化氢的分压P_(H_2S)的提高,使得氢致裂纹问题突出;世界范围内的天然气需求量增加,许多含硫化氢较高的气田正在开发之中,客观上促进了此项研究和抗氢致裂纹钢材研究的开展。认为减少氢致裂纹发生的可能性,应在两个大的方面采取措施:①输送介质脱硫、脱水;避开产生氢致裂纹的输送温度;输送介质的pH值应大于5。②提高管材起裂时最低氢含量C_(th)控制锰Mn和磷P含量,以减少管材偏析。

The study on the SCC of gas line pipe is described in detail. This study originates from the two aspects; the H2S fractional pressure increases as the transfer pressure increases,which presents the SCC problem? the worldwide natural gas demand goes up and many gas fields containing high hydrogen sulfide are been developing,which objectively accelerates this study and the study on the anti-SCC steel. The author considers that the countermeasures against the SCC should be taken in follwing aspects natural gas's sweetening and dewatering; keeping away from the transfer temperature that produces the SCC when operating; the pH of natural gas should be more than 5;increasing the Cth(the minimum hydrogen content)of pipe steel and controlling the Mn and P contents in order to decrease the pipe's segregation.