Abstract
The susceptibility of pitting and cracking of super 13Cr steels in light sour environment was systematicaly investigated by a notched bent beam test using autoclave. In mild condition such as chloride free solution at 25°C, the steels presents the passive state with no pitting and no cracking. With increase in chloride concentration, corrosion morphology changes from passive state into either pitting or general corrosion allowing hydrogen entry into steel so that SSC can occur. In higher temperature condition, passive film also becomes unstable to cause either pitting or general corrosion, however, cracking susceptibility decreases. These events suggest that a principal mechanism of SSC of super 13Cr steel is hydrogen embrittlement in condition that some breakdown of passive film undergoes.The major environmental factors affecting the pitting and cracking susceptibility are H2S partial pressure, temperature and chloride concentratoin, while pH effect is relatively small. The pitting and cracking resistance depends on alloy composition especially Mo content, but hardly influenced by strength of material.
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