Stress corrosion behavior of Cr-containing low-alloy steels in SO2- marine atmosphere
作者
单位
1National Materials Corrosion and Protection Scientific Data Center、Institute for Advanced Materials and Technology、University of Science and Technology Beijing、Beijing 100083、China. 2ChinaState Key Laboratory of Metal Materials for Marine Equipment and Application Anshan、Liaoning 114009、China 3Ansteel Beijing Research Institute Co.LTD、Beijing 102200、China # These authors contributed equally to this work * Correspondence to: Prof. Cuiwei Du、University of Science and Technology Beijing
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
Four different levels of Cr-series low-alloy high-strength steels (0 wt%, 1 wt%, 2 wt%, 3 wt%) were prepared by vacuum melting and hot rolling, and the stress corrosion (SCC) behavior of four steels was investigated by slow rate tensile (SSRT) and U -bend i mmersion tests. The results show that in the simulated marine atmospheric environment, The addition of 3 wt% Cr inhibits the anodic dissolution(AD) of the matrix and Improves SCC resistance by about 5%. However, in the SO 2- simulated marine atmosphere environment, The addition of 3% Cr increases the SCC sensitivity of the steel by about 60% . The reason for this result is that the hydrogen embrittlement (HE) is gradually dominating due to the high concentration of H ions in this environment, while the addition of Cr significantly increases the strength of the steel and the sensitivity of large angle grain boundaries (HAGB). As the sensitivity of steel to H increases, the sensitivity to SCC increases.