Stress corrosion cracking of typical steels for pressure vessels in wet H_2S service environment

摘要

Estimation expressions are derived in this paper for diffusion-dominated crack propagation rates at plateau of the three materials 16MnR, 158MnNbR and 07MnCrMoVR using Gerberich model based on dynamic control process mechanism of hydrogen-induced crack propagation rate in wet H_2S environment and the estimated values are verified using the test results of WOL specimen, and the dynamic control process of SCC propagation in the environment of wet H_2S of different concentrations under normal temperature is discussed.