The paper deals with the effect of high-pressure hydrogen on fatigue crack growth rate of low alloy 34CrMo4 steel used for hydrogen cylinders production. Testing was performed on pre-cracked 1/2 C(T) specimens, which were dynamically loaded both in the air and in pure hydrogen environment at pressure 15 MPa. Fatigue crack growth was measured using potential method measuring system. Hydrogen effect was assessed from different curves fatigue crack growth rate in both environments. Fracture surface analysis subsequently confirmed significant effect of hydrogen on fatigue properties of this material.Keywords: Fatigue crack growth rate, potential method, hydrogen autoclave applications
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