1. Cov yeeb nkab hlau duplex stainless hlau tiam thib ob muaj cov yam ntxwv ntawm cov pa roj carbon tsawg heev, nitrogen tsawg, cov khoom sib xyaw ua ke yog Cr5% Ni0.17% n thiab cov ntsiab lus nitrogen siab dua 2205 piv rau tiam thawj ntawm cov yeeb nkab hlau duplex stainless hlau, uas txhim kho qhov kev tiv thaiv corrosion thiab pitting ntawm cov kua qaub nrog cov concentration chloride ion siab. Nitrogen yog ib qho khoom siv tsim austenite muaj zog. Kev ntxiv nitrogen rau hauv cov hlau duplex stainless hlau tsis tsuas yog txhim kho qhov plasticity thiab toughness ntawm cov hlau yam tsis muaj kev puas tsuaj pom tseeb, tab sis kuj txhim kho lub zog ntawm cov hlau, thiab tiv thaiv cov nag thiab qeeb ntawm carbides.
2. Kev ua haujlwm ntawm lub koom haum: Hauv lub tsev cog khoom, austenite thiab ferrite suav txog li ib nrab ntawm cov khoom khov, uas muaj cov yam ntxwv ntawm cov qauv biphase. Nws khaws cov yam ntxwv ntawm cov hlau tsis muaj zog ferritic me me, tiv taus pitting, tawg thiab chloride kev ntxhov siab corrosion, nrog rau kev tawv zoo, qis embrittlement kub, tiv taus intergranular corrosion thiab cov khoom siv kho tshuab thiab weldability zoo.
3. Nyob rau hauv tib lub siab qib tej yam kev mob yuav txuag tau cov ntaub ntawv, lub zog tso zis thiab kev ntxhov siab corrosion tsis kam ntawm duplex steel stainless hlau yeeb nkab yog yuav luag 1 npaug ntawm austenitic stainless hlau, lub linear expansion coefficient yog tsawg dua li austenitic stainless hlau ntawm austenitic stainless hlau system, thiab cov hlau carbon qis yog ze rau nws. Txias forging tsis zoo li austenitic stainless hlau.
4. Kev vuam: duplex steel stainless hlau yeeb nkab 2205 muaj kev vuam zoo, vuam txias thiab kub tawg rhiab heev me me, feem ntau tsis muaj preheating ua ntej vuam, tsis muaj kev kho cua sov tom qab vuam. Vim yog qhov me me ntawm ib theem ferrite thiab cov ntsiab lus nitrogen siab hauv thaj chaw cuam tshuam cua sov, lub zog ntawm cov hlau vuam tuaj yeem tswj tau thaum lub sijhawm no thaum cov khoom siv vuam raug xaiv tsim nyog, thiab kev ua tau zoo tag nrho yog qhov zoo.
5. Kub tawg: Qhov rhiab heev ntawm kub tawg qis dua li ntawm austenitic stainless hlau. Qhov no yog vim tias cov ntsiab lus nickel tsis siab, cov impurities uas yooj yim tsim cov eutectic yaj qis qis, cov kua zaj duab xis nrog cov melting point qis tsis yooj yim tsim, thiab kev loj hlob sai ntawm cov noob tsis muaj nyob rau ntawm qhov kub siab.
6. Qhov tsis yooj yim ntawm thaj chaw cuam tshuam los ntawm cua sov: Qhov teeb meem tseem ceeb ntawm kev vuam cov yeeb nkab stainless hlau duplex yog thaj chaw cuam tshuam los ntawm cua sov. Vim yog qhov txias sai ntawm thaj chaw cuam tshuam los ntawm cua sov hauv lub xeev tsis sib npaug ntawm lub voj voog cua sov vuam, ntau ferrite txias dua ib txwm khaws cia, uas feem ntau ua rau muaj kev cuam tshuam ntawm kev xeb thiab hydrogen-induced cracking.
7. Vuam metallurgy: Thaum lub sijhawm vuam ntawm duplex stainless hlau, nyob rau hauv qhov kev ua ntawm thermal cycling, lub microstructure thiab thaj chaw cuam tshuam los ntawm cua sov ntawm cov hlau vuam tau dhau los ntawm ntau qhov kev hloov pauv. Thaum kub siab, lub microstructure ntawm duplex stainless hlau yog precipitated los ntawm ferrite thiab austenite thaum lub sijhawm txias. Qhov ntau ntawm austenite precipitation yog cuam tshuam los ntawm ntau yam.
Lub sijhawm tshaj tawm: Lub Rau Hli-26-2023