Ni-Cr-Mo alloys may be damaged by stress corrosion cracking (SCC) in high temperature sour gas environments which contain acid and elemental sulfur. To evaluate the effects of alloying elements in Ni base alloys on the cracking, SCC resistance of various alloys was examined in autoclave environments simulating sour gas wells with acetic acid and elemental sulfur. Further, the susceptibility to hydrogen embrittlement (HE) of alloys was measured by SSRT test. Results indicated that high amount of Mo remarkably increased SCC resistance and HE was also affected by Ni, Mo and Ti.

Subject
Nickel based alloys, Molybdenum alloys, Sour environments, Nickel chromium molybdenum alloys, Sour gas, Aqueous solutions, Copper alloys, Alloying elements, Elemental sulfur, Caustic stress corrosion cracking, Titanium alloys, Alloys, Stress corrosion cracking
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1988
Association for Materials Protection and Performance (AMPP)
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