Abstract
Some of the properties of a 25 pct chromium duplex stainless steel, FERRALIUM ® alloy 255,* as related to sour gas well applications are presented. Autoclave tests have demonstrated negligible corrosion rates in NaCl-, CO2-, and H2S-containing environments to 200 ‡C (400 ‡F). The duplex stainless steel exhibited resistance to environmental embrittlement for a broad range of H2S concentrations. At high H2S concentrations stress corrosion cracking (SCC) is found to occur. Sigma phase formation is detrimental to SCC resistance. Heat treatments at temperatures of 1040 ‡C to 1150 ‡C (1900 ‡F to 2100 ‡F), which are above the sigma-phase formation temperatures, did not have a measurable effect on SCC as determined with plastically deformed two-point beam specimens.
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