Chromium-molybdenum　steels　are　extensively　used　in　manufacturing　large-volume　seamless　hydrogen　storage　vessels,　but　they　still　suffer　from　the　hydrogen　embrittlement　problem.　In　this　study,　electrochemical　cathodic　hydrogen　charging　is　utilized　to　investigate　the　hydrogen　embrittlement　of　4130X　steels,　with　emphasis　on　the　influence　of　charging　current　density　and　temperature　on　hydrogen　permeation　and　hydrogen　embrittlement　susceptibility.　The　hydrogen　penetration　rate　and　hydrogen　diffusion　coefficient　of　4130X　steel　both　increase　with　an　increase　in　hydrogen-charging　current　density　and　temperature.　The　results　demonstrate　that　the　degree　of　hydrogen-induced　degradation　in　tensile　ductility　is　more　marked　with　increasing　hydrogen-charging　current　density,　while　the　hydrogen　embrittlement　index　exhibits　a　peak　at　a　temperature　of　308　K,　in　which　brittle　patterns　like　quasi-cleavage　surfaces　and　crack　formations　occur.　These　findings　are　crucial　for　understanding　hydrogen-induced　embrittlement　and　determining　test　temperatures　of　hydrogen-related　engineering　material　applications.　©　2025　by　the　authors.