Evaluation of Hydrogen Embrittlement of SCM435 Steel by SSRT with Cathodically Charged Specimen

Abstract

Evaluation test of high-pressure hydrogen gas should be carried out more simplified. As an alternative approach in high-pressure hydrogen gas test, to simulate the hydrogen gas environment SSRT was performed with cathodically charged. Specimen was used a low-alloy steel, SCM435 with the tensile strength of 1000 MPa. The tensile properties was evaluated with cathodic charging with 3%NaCl solution and the current density of 50～600A/m² . Values of RRA obtained by the tests at cathode current density of 400A/m² are equivalent to those in the 35MPa hydrogen gas. In addition, an amount of diffusible hydrogen equivalent to that in high-pressure hydrogen gas was obtained by increasing the current density. Therefore, this approach is able to simulate the SSRT conducted in high-pressure hydrogen gas environment.