I-Duplex Stainless Steel (DSS) iwuhlobo lwensimbi engagqwali equkethe cishe izingxenye ezilinganayo ze-ferrite ne-austenite, nesigaba esincane ngokuvamile esakha okungenani u-30%.I-DSS ngokuvamile inokuqukethwe kwe-chromium phakathi kuka-18% no-28% nokuqukethwe kwe-nickel phakathi kuka-3% no-10%.Ezinye izinsimbi ezingenasici eziyi-duplex nazo ziqukethe izakhi ze-alloying ezifana ne-molybdenum (Mo), ithusi (Cu), i-niobium (Nb), i-titanium (Ti), ne-nitrogen (N).
Lesi sigaba sensimbi sihlanganisa izici zazo zombili izinsimbi ezingenasici ze-austenitic ne-ferritic.Uma kuqhathaniswa nezinsimbi ezingenasici ze-ferritic, i-DSS inobupulasitiki obuphakeme nokuqina, ayinakho ukuqina kwezinga lokushisa kwegumbi, futhi ibonisa ukumelana nokugqwala okuthuthukisiwe kwe-intergranular kanye nokushisela.Ngasikhathi sinye, igcina i-brittleness engu-475°C kanye nokusebenza okushisayo okuphezulu kwezinsimbi ezingenasici ze-ferritic futhi ikhombisa ubugqila obungaphezulu.Uma kuqhathaniswa nezinsimbi ezingenasici ze-austenitic, i-DSS inamandla aphakeme futhi imelana kangcono kakhulu ne-intergranular kanye ne-chloride stress corrosion.I-DSS iphinde ibe ne-pitting corrosion resistance enhle kakhulu futhi ithathwa njengensimbi engagqwali eyonga i-nickel.
Isakhiwo Nezinhlobo
Ngenxa yokwakheka kwezigaba ezimbili ze-austenite ne-ferrite, nesigaba ngasinye sibalwa cishe uhhafu, i-DSS ibonisa izici zazo zombili izinsimbi ezingenasici ze-austenitic ne-ferritic.Amandla okukhiqiza e-DSS asuka ku-400 MPa kuya ku-550 MPa, okuphindwe kabili kunawezinsimbi ezingenasici ze-austenitic ezijwayelekile.I-DSS inokuqina okuphezulu, izinga lokushisa eliphansi le-brittle transition, kanye nokuvikeleka kokugqwala kwe-intergranular okuthuthuke kakhulu kanye nokushisela uma kuqhathaniswa nezinsimbi ezingenasici ze-ferritic.Iphinda igcine ezinye izinto zensimbi engagqwali ye-ferritic, efana no-475°C brittleness, izinga eliphezulu le-thermal conductivity, i-coefficient ephansi yokwandisa okushisayo, i-superplasticity, kanye ne-magnetism.Uma kuqhathaniswa nezinsimbi ezingenasici ze-austenitic, i-DSS inamandla aphakeme, ikakhulukazi amandla okukhiqiza, nokumelana okuthuthukisiwe komgodi, ukugqwala kwengcindezi, nokukhathala kokugqwala.
I-DSS ingahlukaniswa ngezinhlobo ezine ngokusekelwe ekwakhekeni kwamakhemikhali ayo: i-Cr18, i-Cr23 (i-Mo-free), i-Cr22, ne-Cr25.Uhlobo lwe-Cr25 lungaphinda luhlukaniswe lube yizinsimbi ezingenasici ezijwayelekile neziyi-super duplex.Kulezi, izinhlobo ze-Cr22 ne-Cr25 zisetshenziswa kakhulu.E-China, iningi lamabanga e-DSS amukelwayo akhiqizwa e-Sweden, okuhlanganisa i-3RE60 (uhlobo lwe-Cr18), i-SAF2304 (uhlobo lwe-Cr23), i-SAF2205 (uhlobo lwe-Cr22), kanye ne-SAF2507 (uhlobo lwe-Cr25).
Izinhlobo ze-Duplex Stainless Steel
1. Uhlobo lwe-Low-Alloy:Imelwe i-UNS S32304 (23Cr-4Ni-0.1N), le nsimbi ayinayo i-molybdenum futhi Inenombolo Elinganayo Yokumelana Ne-Pitting (PREN) ka-24-25.Ingathatha indawo ye-AISI 304 noma i-316 ezinhlelweni zokumelana nokugqwala kwengcindezi.
2. Uhlobo Lwengxubevange Emaphakathi:Imelwe i-UNS S31803 (22Cr-5Ni-3Mo-0.15N), ene-PREN engu-32-33.Ukumelana nokugqwala kwayo kuphakathi kwe-AISI 316L kanye ne-6% Mo+N austenitic stainless steels.
3. Uhlobo Lwengxubevange Ephezulu:Ngokuvamile iqukethe u-25% Cr kanye ne-molybdenum ne-nitrogen, ngezinye izikhathi ithusi ne-tungsten.Imelwe i-UNS S32550 (25Cr-6Ni-3Mo-2Cu-0.2N), ene-PREN ye-38-39, le nsimbi inokumelana nokugqwala okungcono kune-22% Cr DSS.
4. I-Super Duplex Stainless Steel:Iqukethe amazinga aphezulu e-molybdenum ne-nitrogen, emelwe i-UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), ngezinye izikhathi futhi iqukethe i-tungsten nethusi, ene-PREN engaphezu kuka-40. Ifanele izimo zemidiya ezinzima, ezinikeza ukugqwala okuhle kakhulu kanye nemishini izakhiwo, uma ziqhathaniswa nezinsimbi ezingenasici ze-austenitic.
Amabanga e-Duplex Stainless Steel e-China
I-Chinese standard standard GB/T 20878-2007 "Amabanga Ensimbi Engagqwali Nengashisi Nokubunjwa Kwekhemikhali" ihlanganisa amamaki amaningi e-DSS, njenge-14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, ne-12Cr21Ni5Ti.Ukwengeza, i-2205 duplex steel eyaziwa kakhulu ihambisana nebanga lesiShayina elithi 022Cr23Ni5Mo3N.
Izici ze-Duplex Stainless Steel
Ngenxa yesakhiwo sayo sezigaba ezimbili, ngokulawula kahle ukwakheka kwamakhemikhali kanye nenqubo yokwelapha ukushisa, i-DSS ihlanganisa izinzuzo zazo zombili izinsimbi ezingenasici ze-ferritic ne-austenitic.Izuza njengefa ukuqina okuhle kakhulu nokushisela kwezinsimbi ezingenasici ze-austenitic namandla aphezulu nokumelana nokugqwala kwe-chloride yezinsimbi ezingenasici ze-ferritic.Lezi zakhiwo eziphakeme zenze i-DSS yathuthuka ngokushesha njengempahla yesakhiwo eshiselayo kusukela ngeminyaka yawo-1980, iqhathaniswa nezinsimbi ze-martensitic, austenitic, kanye ne-ferritic stainless.I-DSS inezici ezilandelayo:
1. I-Chloride Stress Resistance Corrosion Resistance:I-DSS equkethe i-Molybdenum ibonisa ukumelana okuhle kakhulu nokugqwala kwengcindezi ye-chloride emazingeni aphansi okucindezeleka.Nakuba ama-austenitic stainless steels angu-18-8 evame ukuhlushwa ukugqwala kwengcindezi ezixazululweni ze-chloride ezingathathi hlangothi ezingaphezu kuka-60°C, i-DSS yenza kahle ezindaweni eziqukethe umkhondo wamanani e-chloride ne-hydrogen sulfide, okuyenza ifanelekele izishintshisi zokushisa nama-evaporator.
2. I-Pitting Corrosion Resistance:I-DSS inokumelana nokugqwala kwe-pitting okuhle kakhulu.Ngokulingana okufanayo kwe-Pitting Resistance (PRE=Cr%+3.3Mo%+16N%), i-DSS nezinsimbi ezingenasici ze-austenitic zibonisa amandla afanayo abalulekile wokugoba.Ukumelana nokugqwala kwe-DSS kwe-pitting kanye nokuqhekeka, ikakhulukazi ezinhlotsheni ze-chromium ephezulu, eziqukethe i-nitrogen, kudlula lokho kwe-AISI 316L.
3. Ukukhathala Kokugqwala kanye Nokumelana Nokugqwala:I-DSS yenza kahle ezindaweni ezithile ezigqwalile, iyenze ifanele amaphampu, amavalvu, nezinye izinto zokusebenza zikagesi.
4. Izakhiwo zikaMechanical:I-DSS inamandla aphezulu namandla okukhathala, inamandla okukhiqiza aphindwe kabili kunama-austenitic stainless steels angu-18-8.Esimeni esifakwe isixazululo, ubude bayo bufinyelela ku-25%, futhi inani lokuqina lalo i-AK (V-notch) lidlula i-100 J.
5. Ukushisela:I-DSS inokushisela okuhle nokuthambekela okuphansi kokuqhekeka okushisayo.Ukushisa kuqala akudingekile ngaphambi kokushisela, futhi ukwelashwa kokushisa kwangemuva kwe-weld akudingekile, okuvumela ukushisela ngezinsimbi ezingenasici ezingu-18-8 ze-austenitic noma izinsimbi ze-carbon.
6. Ukusebenza Okushisayo:I-Low-chromium (18%Cr) I-DSS inebanga lokushisa elibanzi elisebenzayo elishisayo nokumelana okuphansi kunezinsimbi ezingenasici ze-austenitic ezingu-18-8, okuvumela ukugingqika okuqondile kumapuleti ngaphandle kokufoja.I-High-chromium (25%Cr) i-DSS inzima kancane emsebenzini oshisayo kodwa ingakhiqizwa ibe amapuleti, amapayipi, nezintambo.
7. Ukusebenza Okubandayo:I-DSS ibonisa ukuqina okukhulu komsebenzi ngesikhathi sokusebenza okubandayo kunezinsimbi ezingenasici ze-austenitic ezingu-18-8, ezidinga ukucindezelwa okuphezulu kokuqala kokuguquguquka ngesikhathi sokwenziwa kwamapayipi namapuleti.
8. I-Thermal Conductivity kanye Nokwandiswa:I-DSS ine-thermal conductivity ephakeme kanye nama-coefficients aphansi okunweba okushisayo uma kuqhathaniswa nezinsimbi ezingenasici ze-austenitic, okuyenza ifaneleke okokusebenza kolayini nokukhiqiza amapuleti ayinhlanganisela.Iphinde ilungele ama-tube cores okushintshanisa ukushisa, enekhono eliphezulu lokushintshanisa ukushisa kunezinsimbi ezingenasici ze-austenitic.
9. Ukuqina:I-DSS igcina ukubola kwezinsimbi ezingenasici ze-chromium ferritic futhi ayifaneleki ukusetshenziswa emazingeni okushisa angaphezu kuka-300°C.Ukuncipha kokuqukethwe kwe-chromium ku-DSS, kuyancipha ukuthambekela kwezigaba ezifana nesigaba se-sigma.
Izinzuzo Zokukhiqiza ze-Womic Steel
I-Womic Steel ingumkhiqizi ohamba phambili wensimbi engagqwali eyi-duplex, ehlinzeka ngezinhlobonhlobo zemikhiqizo ehlanganisa amapayipi, amapuleti, amabha, nezintambo.Imikhiqizo yethu inamathela ezindinganisweni ezinkulu zamazwe ngamazwe futhi iqinisekisiwe nge-ISO, CE, kanye ne-API.Singakwazi ukwamukela ukugadwa okuvela eceleni kanye nokuhlolwa kokugcina, siqinisekisa ukuthi kuhlangatshezwana nezindinganiso zekhwalithi ephezulu kakhulu.
Imikhiqizo yensimbi engagqwali eyiduplex ye-Womic Steel yaziwa ngayo:
Izinto Ezisetshenziswayo Ezisezingeni Eliphezulu:Sisebenzisa kuphela izinto zokusetshenziswa ezinhle kakhulu ukuze siqinisekise ukusebenza komkhiqizo okuphakeme.
Amasu Okukhiqiza Athuthukile:Izakhiwo zethu zokukhiqiza ezisezingeni eliphezulu kanye nethimba elinolwazi zisenza sikwazi ukukhiqiza insimbi engagqwali eyi-duplex enezinhlaka zamakhemikhali ezinembile kanye nezakhiwo zemishini.
Izixazululo Ezenzeka Ngokwezifiso:Sinikeza ububanzi obuningi bosayizi nokucaciswa ukuze kuhlangatshezwane nezidingo ezithile zamakhasimende ethu.
Ukulawula Ikhwalithi Okuqinile:Izinqubo zethu zokulawula ikhwalithi eziqinile ziqinisekisa ukuthi wonke umkhiqizo uhlangabezana namazinga aphezulu kakhulu okusebenza kahle.
Ukufinyeleleka Komhlaba:Ngenethiwekhi eqinile yokuthumela ngaphandle, i-Womic Steel inikezela ngensimbi engagqwali ephindwe kabili kumakhasimende emhlabeni wonke, isekela izimboni ezihlukahlukene ngezinto ezinokwethenjelwa nezisebenza kahle kakhulu.
Khetha i-Womic Steel ngezidingo zakho zensimbi engagqwali eyi-duplex futhi ujabulele ikhwalithi nesevisi engenakuqhathaniswa esihlukanisa embonini.
Isikhathi sokuthumela: Jul-29-2024