Corrosion Fatigue Crack Growth Rate for Petroleum Refining Pressure Vessel Materials (2.25Cr-1Mo Steel)

Abstract The 2.25Cr-1Mo steel is used for pressure vessel components and has sometimes suffered from hydrogen embrittlement. Therefore, it is important to investigate the effect of hydrogen on the embrittlement for 2.25Cr-1Mo steel. Under corrosion fatigue conditions, the effect of hydrogen embrittlement (HE) on corrosion fatigue crack growth rate (CFCGR) appears in different ways depending on the applied stress wave forms. This behavior has been clarified by previous theoretical and experimental analyses. In this paper, based on the cited theoretical analyses, the effect of stress waveform on CFCGR for 2.25Cr-1Mo steel was investigated and the sensitivity to hydrogen embrittlement is examined for this material.