Answer
17-7PH (Yanayin CH900) wani bakin karfe ne mai taurin hazo yana samar da karfin yawan amfanin ƙasa (yawanci $1170-1310$ MPa) da kyakkyawan juriya na gajiya a yanayin yanayin yanayi. Koyaya, a $250 ^{\circ}C$, 17-7PH na iya fuskantar gagarumin annashuwa na danniya akan lokaci. Sabanin haka, Inconel X-750 (Nickel-Chromium gami) an ƙera shi musamman don kwanciyar hankali mai zafi da juriya na lalata a cikin mahalli mai tsami ($H_2S$). X-750 yana kula da modules ɗin sa na roba $E$ mafi inganci a yanayin zafi mai tsayi kuma yana da juriya ga lalata damuwa na chloride (SCC) wanda shine yanayin gazawar farko a cikin kayan aikin teku. Yayin da 17-7PH ya fi tsada-tasiri, X-750 shine mafi kyawun zaɓi don maƙasudin maƙasudin ƙazamin teku inda farashin maido ya zarce ƙimar kayan.
