I-Duplex steel isho umndeni wezinsimbi ezingagqwali ezinezigaba ezimbili ze-microstructure ehlanganisa kokubili i-austenitic (ubuso obumaphakathi nesakhiwo se-cubic crystal) nezigaba ze-ferritic (i-cubic crystal structure) egxile emzimbeni.Lesi sakhiwo esinezigaba ezimbili sitholakala ngokwakhiwa kwengxubevange ethile ehlanganisa izakhi ezifana ne-chromium, i-nickel, i-molybdenum, ne-nitrogen.
Izinsimbi ezingagqwali eziyi-duplex ezivame kakhulu zingezochungechunge lwe-UNS S3XXX, lapho u-“S” emele i-stainless, futhi izinombolo zikhomba ukwakheka kwe-alloy ethile.I-microstructure yezigaba ezimbili inika inhlanganisela yezinto ezifiselekayo, okwenza insimbi eyi-duplex ifanele ukusetshenziswa okuhlukahlukene.Ezinye izici ezibalulekile zensimbi ye-duplex zifaka:
1.I-Corrosion Resistance: Insimbi eyi-Duplex inikeza ukumelana nokugqwala okuhle kakhulu, ikakhulukazi ezindaweni ezinokhahlo eziqukethe ama-chloride.Lokhu kuyenza ifanelekele ukusetshenziswa ekucutshungulweni kwamakhemikhali, uwoyela negesi, kanye nasezisetshenziswa zasolwandle.
I-2.Amandla Aphakeme: Uma kuqhathaniswa nezinsimbi ezingenasici ze-austenitic, insimbi eyi-duplex inamandla aphakeme, okwenza ifaneleke izinhlelo zokusebenza lapho kudingeka khona amandla emishini engeziwe.
3.I-Good Toughness and Ductility: Insimbi eyi-Duplex igcina ukuqina okuhle kanye ne-ductility, ngisho nasezingeni eliphansi lokushisa.Le nhlanganisela yezakhiwo ibalulekile ezinhlelweni lapho okokusebenza kungase kube ngaphansi kwemithwalo ehlukahlukene kanye namazinga okushisa.
I-4.Stress Corrosion Cracking Resistance: Insimbi ye-Duplex ibonisa ukumelana okuhle nokucindezeleka kokuqhekeka kokugqwala, uhlobo lokugqwala okungenzeka ngaphansi kwethonya elihlangene lokucindezeleka okuqinile kanye nendawo elimazayo.
I-5.Izindleko Ezisebenzayo: Nakuba insimbi eyi-duplex ingabiza kakhulu kunensimbi evamile ye-austenitic, izici zayo zokusebenza ngokuvamile zithethelela izindleko, ikakhulukazi ezinhlelweni zokusebenza lapho ukumelana nokubola namandla kubaluleke kakhulu.
Amamaki ajwayelekile ensimbi engagqwali ayi-duplex ahlanganisai-duplex 2205 (UNS S32205)kanye ne-duplex 2507 (UNS S32750).Lawa mabanga asetshenziswa kakhulu ezimbonini ezifana nokucubungula amakhemikhali, ukuhlola uwoyela negesi, ubunjiniyela basolwandle nolwandle, kanye nokukhiqizwa kwe-pulp namaphepha.
Isikhathi sokuthumela: Nov-27-2023