Answer
17-7PH (UNS S17700) wani Semi-austenitic hazo-hardening bakin karfe cewa samar da babban ƙarfi da lalata juriya. A cikin yanayin CH900, ana rage kayan sanyi zuwa Yanayin C sannan kuma an yi taurin shekaru a $900^{\circ}F$ ($482^{\circ}C$). Wannan tsari yana canza austenite zuwa martensite ta hanyar aikin sanyi sannan kuma yana haɓaka lokaci mai wadatar aluminium. Ƙarfin da ake samu yawanci ya wuce $200$ ksi. Don maɓuɓɓugan ruwan raƙuman ruwa, wannan babban iyaka na roba yana ba da damar jujjuyawar mahimmanci ba tare da saiti na dindindin ba. Duk da haka, dole ne masu zanen kaya su yi taka tsantsan game da yuwuwar kayan don lalata lalatawar damuwa (SCC) idan an fallasa su zuwa chlorides yayin da suke cikin matsanancin damuwa. Bugu da ƙari, iyakar gajiya a cikin CH900 an inganta shi ta hanyar rarrabuwar hazo mai kyau, yana mai da shi sama da 302/304 bakin karfe don ɗaukar nauyi mai ƙarfi a cikin masu sarrafa jirgin.
