F51, F53, F55, F60 da F61 duplex ne kuma super duplex bakin karfe nadi wanda aka karɓa daga ASTM A182. Wannan ma'auni yana ɗaya daga cikin ƙa'idodin da aka ambata don samar da bakin karfe.
Ƙungiyar Gwaje-gwaje da Kayan Aiki ta Amurka (ASTM) tana ɗaya daga cikin manyan ƙungiyoyin ma'auni na duniya, bita, tattarawa da buga ƙa'idodin fasaha don haɓaka kewayon kayan. Ka'idodin da aka buga waɗanda suka fara da harafin 'A' murfin ƙarfe.
Standard ASTM A182 ('Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service') yanzu yana cikin bugu na 19th (2019). A tsawon waɗannan bugu, an ƙara sabbin allunan kuma an ware sabuwar lambar 'grade'. Fayil na 'F' yana bayyana mahimmancin wannan ma'auni ga samfuran jabun. Ƙarshen lambar an haɗa shi da nau'in alloy watau austenitic, martensitic, amma ba cikakke ba ne. Abubuwan da ake kira 'Ferritic-Austenitic' duplex steels ana ƙidaya su ne tsakanin F50 da F71, tare da lambobi masu hawa sama a wani ɓangare kusan ƙarin maki kwanan nan.
Daban-daban maki na Duplex Bakin Karfe
ASTM A182 F51 yayi daidai da UNS S31803. Wannan shine ainihin taken don 22% Cr duplex bakin karfe. Koyaya, kamar yadda aka bayyana a cikin labarin da ya gabata, masana'antun sun inganta abun da ke ciki zuwa saman ƙarshen iyaka don haɓaka juriyar lalata. Wannan darajojin, tare da ƙayyadaddun ƙayyadaddun bayanai, an rubuta shi azaman F60, wanda yayi daidai da UNS S32205. Saboda haka, S32205 na iya zama biyu-certified kamar yadda S31803 amma ba mataimakin versa. Yana da lissafin kusan kashi 80% na samar da bakin karfe na duplex gabaɗaya. Langley Alloys hannun jariSanmac 2205, wanda shine samfurin mallakar Sandvik wanda ke ba da 'ingantattun injina a matsayin daidaitaccen'. Kewayon hannun jarinmu yana daga ½” har zuwa sanduna masu ƙarfi na diamita na 450mm, da sanduna mara kyau da faranti ma.
ASTM A182 F53 yayi daidai da UNS S32750. Wannan shine 25% Cr super duplex bakin karfe wanda Sandvik ya inganta shi azamanSAF2507. Tare da ƙarin abun ciki na chromium idan aka kwatanta da F51 yana ba da ingantacciyar juriyar lalata. Ƙarfin yawan amfanin ƙasa kuma ya fi girma, yana ƙyale masu ƙira don rage girman sashe don aikace-aikacen ɗaukar kaya. Langley Alloys yana hannun jari SAF2507 tabbatattun sanduna daga Sandvik, a cikin masu girma dabam daga ½” zuwa diamita 16”.
ASTM A182 F55 yayi daidai da UNS S32760. Asalin wannan darasi za a iya gano shi zuwa ci gaban Zeron 100 ta Platt & Mather, Manchester UK. Yana da wani super duplex bakin karfe dangane da 25% Cr abun da ke ciki, amma tare da ƙari na tungsten. Langley Alloys hannun jariSaukewa: SAF32760sanduna masu ƙarfi daga Sandvik, a cikin masu girma dabam daga ½” zuwa 16” diamita.
ASTM A182 F61 yayi daidai da UNS S32550. Wannan, bi da bi, kimanin Ferralium 255 ne, ainihin bakin karfen super duplex wanda ya ƙirƙira ta.Langley Alloys. An ƙaddamar da shi a cikin 1969, yanzu ya ba da sabis na nasara fiye da shekaru 50 a cikin aikace-aikacen da yawa masu buƙata. Idan aka kwatanta da F53 da F55 yana ba da ƙarin ƙarfi da aikin lalata. Matsakaicin ƙarfin amfanin sa ya wuce 85ksi, yayin da sauran maki an iyakance ga 80ksi. Bugu da ƙari, ya ƙunshi har zuwa 2.0% na jan karfe, wanda ke taimakawa juriya na lalata. Langley Alloys hannun jariFarashin 255-SD50a cikin masu girma dabam daga 5/8 "zuwa 14" diamita m mashaya, da faranti har zuwa 3" kauri.
Lokacin aikawa: Maris-06-2020