Hydrogen embrittlement assessment of ultra-high strength steel 30CrMnSiNi2

- Hydrogen embrittlement can be assessed by combining CH and σys on KIH.
- KIH was found to increase and da/dt decrease with D if σys < 1360 MPa.
- KIH and da/dt were found to be independent of D when σys ⩾ 1360 MPa.
- Hydrogen diffusion coefficient is affected by temper temperature.