Bakin Karfe - Matsayi 2205 Duplex (UNS S32205)

Gabatarwa

Duplex 2205 bakin karfe (duka ferritic da austenitic) ana amfani da su sosai a cikin aikace-aikacen da ke buƙatar juriya mai kyau da ƙarfi.S31803 bakin karfe ya yi gyare-gyare da yawa wanda ya haifar da UNS S32205, kuma an amince da shi a cikin shekara ta 1996. Wannan matakin yana ba da juriya ga lalata.

A yanayin zafi sama da 300 ° C, ƙananan ƙananan abubuwa na wannan matakin suna fuskantar hazo, kuma a yanayin zafi da ke ƙasa -50 ° C ƙananan ƙwayoyin cuta suna jujjuya ductile-zuwa gaggautsa;don haka wannan matakin na bakin karfe bai dace da amfani da shi ba a yanayin zafi.

Maɓalli Properties

Bakin Karfe - Matsayi 2205 Duplex (UNS S32205)

Kaddarorin da aka ambata a cikin teburin da ke ƙasa sun shafi samfuran da aka yi birgima kamar faranti, zanen gado da coils na ASTM A240 ko A240M.Waɗannan ƙila ba za su kasance iri ɗaya a cikin sauran samfuran kamar sanduna da bututu ba.

Abun ciki

Bakin Karfe - Matsayi 2205 Duplex (UNS S32205)

Tebu 1 yana ba da jeri na abun ciki don sa 2205 duplex bakin karfe.

Tebur 1- Matsakaicin kewayon don 2205 bakin karfe

Kayayyakin Injini

An jera kaddarorin injiniyoyi na nau'ikan bakin karfe 2205 a cikin teburin da ke ƙasa.Grade S31803 yana da irin wannan kaddarorin inji zuwa na S32205.

Table 2- Mechanical Properties na 2205 grade bakin karfe

Abubuwan Jiki

Bakin Karfe - Matsayi 2205 Duplex (UNS S32205)

An tsara kaddarorin jiki na nau'ikan bakin karfe 2205 a ƙasa.Grade S31803 yana da kaddarorin jiki iri ɗaya zuwa na S32205.

Table 3- Kaddarorin jiki na 2205 bakin karafa

Kwatanta Ƙirar Maki

Bakin Karfe - Matsayi 2205 Duplex (UNS S32205)

Table 4 yana ba da kwatancen daraja don 2205 bakin karfe.Ƙimar kwatancen kayan aiki iri ɗaya ne.Ana iya samun daidaitattun daidaitattun daidaitattun bayanai daga ainihin ƙayyadaddun bayanai.

Table 4-Kwatancen ƙayyadaddun darajar daraja don bakin karfe 2205

Matsaloli masu yuwuwar Madadin

An bayar a ƙasa akwai jerin yiwuwar madadin maki, waɗanda za a iya zaɓa a maimakon 2205.

Table 5-Kwatancen ƙayyadaddun darajar daraja don bakin karfe 2205

Juriya na Lalata

Grade 2205 bakin karfe yana nuna kyakkyawan juriya na lalata, wanda ya fi girma fiye da na sa na 316. Yana tsayayya da nau'in lalata na gida kamar intergranular, crevice da pitting.CPT na irin wannan bakin karfe yana kusa da 35 ° C.Wannan matakin yana da juriya ga lalatawar chloride stress (SCC) a yanayin zafi na 150°C.Bakin Karfe na Grade 2205 sune madaidaicin maye gurbin zuwa maki austenitic, musamman a yanayin gazawar da ba a kai ba da muhallin ruwa.

Juriya mai zafi

Babban juriya na iskar shaka na Grade 2205 ya lalace ta hanyar ƙwanƙwasa sama da 300°C.Za'a iya gyara wannan ɓarna ta hanyar cikakkiyar magani mai ɓarna.Wannan matakin yana aiki da kyau a yanayin zafi ƙasa da 300 ° C.

Maganin Zafi

Mafi dacewa da maganin zafi don wannan aji shine maganin warwarewa (annealing), tsakanin 1020 - 1100 ° C, sannan kuma saurin sanyaya.Grade 2205 na iya yin aiki tuƙuru amma ba za a iya taurare ta hanyoyin thermal ba.

Walda

Yawancin daidaitattun hanyoyin walda sun dace da wannan matakin, sai dai walda ba tare da ƙarafa ba, wanda ke haifar da wuce gona da iri.AS 1554.6 ya riga ya cancanci waldi don 2205 tare da sanduna 2209 ko na'urorin lantarki ta yadda karfen da aka ajiye ya sami daidaitaccen tsarin duplex daidai.

Ƙara nitrogen zuwa iskar kariya yana tabbatar da cewa an ƙara isasshen austenite zuwa tsarin.Dole ne a kiyaye shigar da zafi a ƙaramin matakin, kuma dole ne a guji amfani da zafin gaba ko bayan zafi.Haɗin haɓaka haɓakar haɓakar thermal don wannan ƙimar yana da ƙasa;don haka murdiya da damuwa sun yi ƙasa da na austenite maki.

Machining

Machinability na wannan daraja yana da ƙasa saboda ƙarfinsa.Gudun yankan sun kusan 20% ƙasa da na sa na 304.

Kera

Ƙirƙirar wannan daraja kuma ƙarfinsa yana tasiri.Lankwasawa da kafa wannan matakin yana buƙatar kayan aiki tare da babban ƙarfi.Ductility na sa 2205 ya fi ƙasa da maki austenitic;sabili da haka, yanayin sanyi ba zai yiwu a wannan matakin ba.Domin gudanar da ayyukan sanyi a kan wannan matakin, ya kamata a yi tsaka-tsaki annealing.

Aikace-aikace

Wasu daga cikin aikace-aikacen yau da kullun na nau'in ƙarfe na duplex karfe 2205 an jera su a ƙasa:

• Binciken mai da iskar gas
• Kayan aikin sarrafawa
• Sufuri, ajiya da sarrafa sinadarai
• High chloride da marine muhallin
• Injin takarda, tankunan giya, ɓangaren litattafan almara da narke takarda