煤制气环境中氢含量对X80管线钢氢脆敏感性的影响规律

摘要

通过紧固圆盘压力试验及缺口慢应变拉伸试验,结合断口分析,对X80管线钢在气态氢环境中的敏感性进行评价,并研究了含氢煤制气环境中X80管线钢的氢脆敏感性随氢含量的变化规律.结果表明:X80管线钢在氦气和氢气环境中的爆破压力比pHe/pHz为1～2,具有一定的氢脆敏感性;在含氢环境中应用时,应当根据使用环境进行进一步的评价;氢分压为0.36 MPa时,X80管线钢的断后伸长率和断面收缩率与在常温常压空气中的结果接近,当氢分压高于0.36 MPa时,随氢含量的升高,X80管线钢的塑性损失增加,断口表现出脆化特征,氢脆敏感性增加.%The sensitivity of X80 steel in gaseous hydrogen environment was evaluated by tightened disk pressure test and notch slow strain tensile test combined with fracture analysis,and the change rule of hydrogen embrittlement sensitivity of X80 pipeline steel with the hydrogen content in hydrogen containing coal gas environment was also studied.The results showed that the burst pressure ratio (pHe/pH2) of X80 pipeline steel in the atmosphere of helium and hydrogen was 1～2,and X80 pipeline steel had certain hydrogen embrittlement sensitivity.When X80 pipeline steel was used in the environment containing hydrogen,it should be further evaluated according to the use environment.When the partial pressure of hydrogen was 0.36 MPa,the elongation after fracture and reduction of area of X80 pipeline steel were similar to those in air at normal temperature and pressure.When the partial pressure of hydrogen was higher than 0.36 MPa,with the increase of hydrogen partial pressure,the plastic loss of X80 pipeline steel increased,the fracture exhibited embrittlement,and the hydrogen embrittlement sensitivity increased.