Duplex Stainless Steel (DSS) ndi mtundu wazitsulo zosapanga dzimbiri zomwe zimakhala ndi magawo ofanana a ferrite ndi austenite, ndipo gawo locheperako nthawi zambiri limapanga pafupifupi 30%.DSS imakhala ndi chromium pakati pa 18% ndi 28% ndi faifi tambala pakati pa 3% ndi 10%.Zitsulo zina zosapanga dzimbiri zosapanga dzimbiri zimakhalanso ndi zinthu monga molybdenum (Mo), mkuwa (Cu), niobium (Nb), titaniyamu (Ti), ndi nayitrogeni (N).
Gulu ili lazitsulo limaphatikiza mawonekedwe azitsulo zosapanga dzimbiri za austenitic ndi ferritic.Poyerekeza ndi zitsulo zosapanga dzimbiri za ferritic, DSS ili ndi pulasitiki yapamwamba komanso yolimba, ilibe kutentha kwa chipinda, ndipo imawonetsa kukana kwa dzimbiri kwa intergranular ndikuwotcherera.Panthawi imodzimodziyo, imakhalabe ndi 475 ° C brittleness ndi matenthedwe apamwamba a zitsulo zosapanga dzimbiri za ferritic ndikuwonetsa superplasticity.Poyerekeza ndi zitsulo zosapanga dzimbiri za austenitic, DSS ili ndi mphamvu zapamwamba komanso kukana bwino kwa intergranular ndi chloride stress corrosion.DSS imakhalanso ndi chitsulo chosapanga dzimbiri cha nickel-pitting corrosion resistance.
Kapangidwe ndi Mitundu
Chifukwa cha magawo awiri a austenite ndi ferrite, gawo lililonse limawerengera pafupifupi theka, DSS imawonetsa mawonekedwe azitsulo zosapanga dzimbiri za austenitic ndi ferritic.Mphamvu zokolola za DSS zimachokera ku 400 MPa kufika ku 550 MPa, zomwe ndizowirikiza kawiri zazitsulo zosapanga dzimbiri za austenitic.DSS ili ndi kulimba kwapamwamba, kutentha kwapang'onopang'ono kosasunthika, komanso kuwongolera bwino kwa intergranular corrosion resistance ndi weldability poyerekeza ndi zitsulo zosapanga dzimbiri za ferritic.Imasunganso zinthu zina zachitsulo zosapanga dzimbiri, monga 475 ° C brittleness, matenthedwe apamwamba kwambiri, kuchuluka kwamafuta otsika, superplasticity, ndi magnetism.Poyerekeza ndi zitsulo zosapanga dzimbiri za austenitic, DSS ili ndi mphamvu zapamwamba, makamaka mphamvu zokolola, komanso kukana kutsekereza, kupsinjika kwa dzimbiri, komanso kutopa kwa dzimbiri.
DSS ikhoza kugawidwa m'mitundu inayi kutengera kapangidwe kake ka mankhwala: Cr18, Cr23 (Mo-free), Cr22, ndi Cr25.Mtundu wa Cr25 ukhoza kugawidwanso kukhala zitsulo zosapanga dzimbiri komanso zapamwamba kwambiri.Mwa izi, mitundu ya Cr22 ndi Cr25 imagwiritsidwa ntchito kwambiri.Ku China, magiredi ambiri a DSS omwe amatengedwa amapangidwa ku Sweden, kuphatikiza 3RE60 (mtundu wa Cr18), SAF2304 (mtundu wa Cr23), SAF2205 (mtundu wa Cr22), ndi SAF2507 (mtundu wa Cr25).
Mitundu ya Duplex Stainless Steel
1. Mtundu wa Low-Alloy:Choyimiridwa ndi UNS S32304 (23Cr-4Ni-0.1N), chitsulo ichi chilibe molybdenum ndipo chili ndi Pitting Resistance Equivalent Number (PREN) ya 24-25.Itha kulowa m'malo mwa AISI 304 kapena 316 mukugwiritsa ntchito kukana kwa kutu.
2. Mtundu wa Aloyi Wapakatikati:Ikuyimiridwa ndi UNS S31803 (22Cr-5Ni-3Mo-0.15N), yokhala ndi PREN ya 32-33.Kukana kwake kwa dzimbiri kuli pakati pa AISI 316L ndi 6% Mo+N austenitic zitsulo zosapanga dzimbiri.
3. Mtundu wa Aloyi Wapamwamba:Nthawi zambiri imakhala ndi 25% Cr pamodzi ndi molybdenum ndi nitrogen, nthawi zina mkuwa ndi tungsten.Yoyimiridwa ndi UNS S32550 (25Cr-6Ni-3Mo-2Cu-0.2N), yokhala ndi PREN ya 38-39, chitsulo ichi chimakhala ndi kukana kwa dzimbiri kuposa 22% Cr DSS.
4. Super Duplex Stainless Steel:Lili ndi molybdenum ndi nitrogen yambiri, yomwe imayimiridwa ndi UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), nthawi zina imakhala ndi tungsten ndi mkuwa, yokhala ndi PREN pamwamba pa 40. Ndi yoyenera pazochitika zowawa, zomwe zimapereka dzimbiri komanso makina opangira makina. katundu, wofanana ndi super austenitic zitsulo zosapanga dzimbiri.
Maphunziro a Duplex Stainless Steel ku China
Mitundu yatsopano ya Chitchaina ya GB/T 20878-2007 "Makalasi Azitsulo Osasunthika ndi Kutentha Kwambiri ndi Chemical Composition" imaphatikizapo magiredi ambiri a DSS, monga 14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, ndi 12Cr21Ni5Ti.Kuphatikiza apo, chitsulo chodziwika bwino cha 2205 duplex chimafanana ndi kalasi yaku China 022Cr23Ni5Mo3N.
Makhalidwe a Duplex Stainless Steel
Chifukwa cha mawonekedwe ake a magawo awiri, poyang'anira bwino mankhwala opangira mankhwala ndi kutentha, DSS imaphatikiza ubwino wazitsulo zosapanga dzimbiri za ferritic ndi austenitic.Imatengera kulimba kwabwino kwambiri komanso kutenthetsa kwazitsulo zosapanga dzimbiri za austenitic komanso kulimba kwambiri komanso kulimba kwa chloride kukana dzimbiri kwazitsulo zosapanga dzimbiri za ferritic.Zinthu zapamwambazi zapangitsa DSS kukula mwachangu ngati zida zowotcherera kuyambira m'ma 1980, zomwe zimafanana ndi zitsulo zosapanga dzimbiri za martensitic, austenitic, ndi ferritic.DSS ili ndi izi:
1. Chloride Stress Corrosion Resistance:DSS yokhala ndi molybdenum imawonetsa kukana kwamphamvu kwa chloride stress corrosion pamilingo yotsika yopsinjika.Ngakhale 18-8 austenitic zitsulo zosapanga dzimbiri zimavutitsidwa ndi kupsinjika kwa dzimbiri munjira zosalowerera za chloride pamwamba pa 60 ° C, DSS imachita bwino m'malo okhala ndi kuchuluka kwa ma chloride ndi hydrogen sulfide, kupangitsa kuti ikhale yoyenera kusinthanitsa kutentha ndi ma evaporator.
2. Pitting Corrosion Resistance:DSS ili ndi kukana kwabwino kwa pitting corrosion.Ndi Pitting Resistance Equivalent yofanana (PRE=Cr%+3.3Mo%+16N%), DSS ndi zitsulo zosapanga dzimbiri za austenitic zimawonetsa kuthekera kofananako.DSS's pitting and crevice corrosion resistance, makamaka mu high-chromium, mitundu yokhala ndi nayitrogeni, kuposa ya AISI 316L.
3. Kutopa kwa Corrosion and Wear Corrosion Resistance:DSS imagwira ntchito bwino m'malo owononga, ndikupangitsa kuti ikhale yoyenera mapampu, mavavu, ndi zida zina zamagetsi.
4. Katundu Wamakina:DSS ili ndi mphamvu zambiri komanso mphamvu zotopa, zokhala ndi mphamvu zokolola kawiri kuposa 18-8 austenitic zitsulo zosapanga dzimbiri.M'malo ophatikizidwa ndi yankho, kutalika kwake kumafika 25%, ndipo kulimba kwake AK (V-notch) kumaposa 100 J.
5. Weldability:DSS ili ndi weldability wabwino wokhala ndi zizolowezi zotsika zotentha.Kutentha koyambirira sikofunikira musanayambe kuwotcherera, ndipo kutentha kwa pambuyo pa kuwotcherera sikofunikira, kulola kuwotcherera ndi zitsulo zosapanga dzimbiri 18-8 za austenitic kapena zitsulo za carbon.
6. Ntchito Yotentha:Low-chromium (18% Cr) DSS ili ndi kutentha kwakukulu kogwira ntchito komanso kutsika kochepera kuposa 18-8 austenitic zitsulo zosapanga dzimbiri, zomwe zimaloleza kugubuduzika m'mbale popanda kufota.High-chromium (25% Cr) DSS ndiyovuta pang'ono pantchito yotentha koma imatha kupangidwa kukhala mbale, mapaipi, ndi mawaya.
7. Ntchito Yozizira:DSS imawonetsa kuuma kwa ntchito yayikulu pakuzizira kozizira kuposa zitsulo zosapanga dzimbiri 18-8, zomwe zimafunikira kupsinjika koyambirira kwapang'onopang'ono pakupanga chitoliro ndi mbale.
8. Thermal Conductivity ndi Kukula:DSS ili ndi matenthedwe apamwamba kwambiri komanso ma coefficients owonjezera amafuta otsika poyerekeza ndi zitsulo zosapanga dzimbiri za austenitic, zomwe zimapangitsa kuti ikhale yoyenera pazida zomangira ndi kupanga mbale zophatikiza.Ndiwoyeneranso kwa ma chubu osinthira kutentha, okhala ndi kutentha kwapamwamba kwambiri kuposa zitsulo zosapanga dzimbiri za austenitic.
9. Kuwala:DSS imasunga zikhalidwe za brittleness za zitsulo zosapanga dzimbiri za chromium ferritic ndipo ndizosayenera kugwiritsidwa ntchito pakutentha kopitilira 300 ° C.Kutsika kwa chromium mu DSS, kumachepetsanso magawo a brittle monga gawo la sigma.
Ubwino Wopanga Womic Steel
Womic Steel ndi omwe amapanga zitsulo zosapanga dzimbiri ziwiri, zomwe zimapereka zinthu zambiri kuphatikiza mapaipi, mbale, mipiringidzo, ndi mawaya.Zogulitsa zathu zimatsatira miyezo yayikulu yapadziko lonse lapansi ndipo ndizotsimikizika za ISO, CE, ndi API.Titha kulolera kuyang'anira gulu lachitatu ndikuwunika komaliza, kuwonetsetsa kuti miyezo yapamwamba kwambiri ikukwaniritsidwa.
Zopangira zitsulo zosapanga dzimbiri za Womic Steel zimadziwika ndi:
Zopangira Zapamwamba:Timagwiritsa ntchito zida zabwino kwambiri zokha kuti titsimikizire kuti zinthu zikuyenda bwino.
Njira Zapamwamba Zopangira:Zopangira zathu zamakono komanso gulu lodziwa zambiri zimatithandiza kupanga zitsulo zosapanga dzimbiri za duplex zokhala ndi zida zodziwika bwino zamakina ndi zida zamakina.
Customizable Solutions:Timapereka makulidwe osiyanasiyana ndi mafotokozedwe kuti tikwaniritse zosowa zenizeni za makasitomala athu.
Kuwongolera Kwabwino Kwambiri:Njira zathu zowongolera zowongolera zimatsimikizira kuti chinthu chilichonse chimakwaniritsa zabwino kwambiri.
Kufikira Padziko Lonse:Ndi netiweki yamphamvu yotumiza kunja, Womic Steel imapereka zitsulo zosapanga dzimbiri ziwiri kwa makasitomala padziko lonse lapansi, zothandizira mafakitale osiyanasiyana ndi zida zodalirika komanso zogwira ntchito kwambiri.
Sankhani Womic Steel pazosowa zanu zaduplex zitsulo zosapanga dzimbiri ndikuwona zabwino ndi ntchito zomwe zimatisiyanitsa pamakampani.
Nthawi yotumiza: Jul-29-2024