1. Dab tsi yog super duplex txhais tau?
Cov yam ntxwv tseem ceeb ntawm super duplex cov hlau:
Alloy Muaj pes tsawg:
Chromium (CR): 24-26%
Nickel (NI): 6-8%
Molybdenum (MO): 3-5%
Nitrogen (n): 0.2-0.3%
Kev tsim: Kev sib xyaw sib xyawferrite(~ 50%) thiabib qho kev ua siab ntev (~50%).
Pitting tiv thaiv tus lej sib npaug (pren): Ntau dua los yog sib npaug rau 40 (ib qho kev ntsuas ntawm corrosion tsis kam; siab dua qhov tseem ceeb {1} .
Cov qib kawm: Unrert s32750 (2507), Untrential S32760 (2507hd), en 1.4501 / {5 5}}
2. Cov txiaj ntsig ntawm chav hlaus duplex stainless yog dab tsi?
Zoo heev corrosion
Pitting & corrose corrosion: Tiv taus chloride-inducles corrosion (e .}}}}}}) zoo dua li autusenitic hlau (304/316).
Kev ntxhov siab corrosion cracking (SCC): Deb tiv taus cov hlau antenemic hauv chloride ib puag ncig (ib hom tseem ceeb tsis ua haujlwm hauv 304/316).
High Txhua Yam Zog
Paib lub zog: ~ 2 × siab dua li Austenitic steels (e .} puple muaj lub zog; duplexs muaj ~ 450-550 mpa).
Qhov hnyav Txuag: Lub zog siab dua tso cai rau cov ntu thinner, txo cov khoom siv thiab tus nqi .
Zoo Weldability
Welds tuaj yeem tswj cov chav tsev duplex microstructure nrog cov chaw ua haujlwm kom raug hlau (E {} g}}}} {{.
Nqi-Zoo
Cov ntsiab lus npib tsib xee dua li Austenic steels (e .}}}}}}}
Durability & tougning
Kev sib txawv thiab cuam tshuam tsis kam, txawm tias ntawm tsawg kub (nqis rau ~ {-50℃rau qee qib).
3. Dab tsi yog qhov tsis zoo ntawm cov hlau duplex?
Tsawg cov kub tiv thaiv
Not suitable for high-temperature applications (>300-350 degree) vim:
Kev pheej hmoo ntawm kev tsim cov txheej txheem σ-theem (Brittle Intermetallic sib xyaw) .
Austenite tej zaum yuav hloov mus rau Ferrite ntawm temps ntawm cov teeb tsa siab, tsis sib thooj ntawm microstructure .
Kev rhiab heev rau kev kho cua sov
Kev tsis raug vuam lossis analing tuaj yeem ua rau:
Ntau dhau ferrite (txo qhov ductility thiab corrosion tsis kam) .
Carbide nag lossis daus (e {.}}}}}, uas depletes chromium thiab lowers corrosion tsis kam {}}
Fabrication nyuaj
Lub zog siab ua rau machining thiab txias ua ntau dua nyuaj tshaj li Austenitic steels (yuav tsum tau cov cuab yeej tshwj xeeb thiab cov tswv yim).
Tus nqi (rau super duplex)
Super Duplex cov qib yog kim dua cov qauv duplex vim muaj cov ntsiab lus ntau dua li qee cov npib tsib xee li {}}
Sib nqus permeability
Ferritic theem ua rau Duplex cov hlau me ntsis sib nqus, uas tej zaum yuav yog qhov xav tau cov ntaub ntawv tsis muaj sib nqus (e {}, cov khoom siv kho mob).
{{04.} douplex stainless hlau xeb?
Tsis yog, nws tsis "xeb" nyob rau hauv kev paub zoo, tab sis nws tuaj yeem raug kev txom nyem los ntawmkev ua cev tubnyob rau hauv huab meem yog tias nws cov ntsiab lus alloy yog qhov tsis txaus rau ib puag ncig .
Corrosion tsis kam nyob ntawm:
Ib puag ncig (e {{{{0} g .}}, chloride concentration, pH, ntsuas kub).
Qib:
Cov qauv duplex (e {{{0} g ., 2205): Tiv taus feem ntau cov tshuaj tsis huv, tshuaj me me, thiab cov roj cua sov .
Super Duplex (e {. g ., 2507): Tiv taus rau cov chaw muaj ib puag ncig uas muaj kev sib xyaw zoo heev (e {.}}}}} Cov txheej txheem acidic).
Pitting / crevice corrosion kev pheej hmoo: Tuaj yeem tshwm sim nyob rau hauv tsis zoo, high chloride ib puag ncig (e . Partns) yog tias tsis tsim nyog / tswj kav dej khov kho
5. Dab tsi yog qhov tsawg kawg nkaus kub rau super duplex?
Cov yam tsawg kawg kev pabcuam kub:
Txheem duplex (e {. g ., 2507):
Tuaj yeem ua haujlwm reliably mus rau{{0-50℃(-58℃f)Yog tsis muaj qhov tsis zoo poob ntawm ductility lossis tawv .
Cov qib tshwj xeeb:
Qee cov qauv sib txawv tuaj yeem muaj ntawv pov thawj rau qhov kub qis (e {{{} g}}}}}}}.
Kev Txiav Txim Siab Tseem Ceeb:
Lub ferrite-Austenite microstructure ntawm cov temps, tsis zoo li ua rau muaj cov hlau ferritic (uas ua rau nkig hauv qab no ~ {{1} degree).
