A350LF2钢在湿H_2S环境中的力学性能损伤

Degradation of mechanical properties of A350LF2 steel in environment with H_2S

研究了腐蚀时间、溶液温度、pH值对A350LF2钢在湿H2S环境中力学性能的影响。结果表明:H2S腐蚀后,A350LF2钢的力学性能变化不但与腐蚀环境密切相关,还与腐蚀后力学性能的测试周期密切相关。材料的抗拉强度、屈服强度等性能随环境条件变化呈现不同的变化规律,并且发现腐蚀后立刻进行的性能测试表明,力学性能损伤比较严重;而腐蚀后放置一段时间后的力学性能测试结果表明,损伤的力学性能不同程度得到恢复,甚至达到腐蚀前材料的力学性能。结合扩散氢测试结果分析认为,A350LF2钢力学损伤程度与钢中氢含量密切相关。

Evolution law of mechanical properties of A350LF2 steel in wet hydrogen sulfide environment was investigated.The effects of corrosion time,solution temperature and pH value on mechanical properties of the steel were examined.The results show that not only the corrosion environment but also delay time tensile testing after etching can affect the mechanical properties of A350LF2 steel after H2 S corrosion.The tensile strength and yield strength of the steels present different variation rules in different environments.Moreover,the result of tensile test that was carried out immediately after corrosion show that the degradation of mechanical properties of the steels is serious.However,laying specimens for certain time after etching,the tensile test results indicate that the degraded mechanical properties can be partially recovered,and even more to the state before corrosion.Combining with diffusible hydrogen test results,it is suggested that the degradation degree of mechanical properties of A350LF2 steel depends on hydrogen content of steels.