Abstract
Abstract Seven alloys for deep sour gas wells were evaluated for sulfide stress cracking resistance by the double cantilever beam (DCB) method. Representatives of 20 laboratories participated in one or both of two round-robin testing programs. These were conducted in support of the successful effort to include the DCB test in an expanded NACE test method, TM0177-90 (D). Test materials included cast and wrought products, low-alloy and stainless steels, and non-ferrous alloys. The test results reveal generally minor variation of KISSC within data sets from individual laboratories but rather high variation between laboratories. This latter variation is greatest for the two cast alloys and lowest for wrought stainless, Ni- and Ti- base alloys. The variation between laboratories for C-90 is attributed mainly to differences in initial arm displacement; on average, KISSC rises approximately 0.2 ksi√in. per 0.001-in. increase in arm displacement. At fixed arm displacement, the DCB test for C-90 exhibits good repr...
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