Vim nws zoo heev corrosion kuj,316L stainless hlauyog dav siv hauv kev lag luam chemical. Ib qho derivative ntawm 18-8 hom austenitic stainless hlau, 316L yog alloyed nrog ntxiv ntawm 2-3% molybdenum.
2205 duplex stainless hlausuav nrog nitrogen los txhim kho nws cov kev tiv thaiv rau hauv zos corrosion. Nws cov khoom-solution microstructure muaj kwv yees li ntawm qhov sib npaug ntawm ferrite thiab austenite theem- feem ntau, cov ntsiab lus ntawm cov theem me yuav tsum muaj tsawg kawg yog 30%- yog li muab nws nrog cov yam ntxwv ntawm ob qho tib si ferritic thiab austenitic stainless hlau. Tsab ntawv xov xwm no yuav sib piv ob cov ntaub ntawv thoob plaws ntau yam, suav nrog lawv cov kev tiv thaiv corrosion, cov khoom siv kho tshuab, thiab kev siv daim ntawv thov.
Qhov sib txawv ntawm Corrosion Resistance
Uniform Corrosion Resistance
Vim nws muaj pes tsawg leeg -muaj 22% chromium, 3% molybdenum, thiab 0.18% nitrogen-2205 stainless hlau nthuav tawm cov khoom tiv thaiv corrosion zoo dua li ntawm 316 stainless hlau hauv feem ntau tshaj tawm.
Localized Corrosion Resistance
Qhov tshwj xeeb feem ntawm chromium, molybdenum, thiab nitrogen tam sim no nyob rau hauv 2205 stainless hlau endow nws muaj zog tiv thaiv pitting thiab crevice corrosion nyob rau hauv ob qho tib si oxidizing thiab acidic daws.
Kev nyuaj siab Corrosion Resistance
Cov qauv duplex ntawm 2205 muab kev tiv thaiv zoo rau chloride stress corrosion cracking (SCC). Hauv qhov sib piv, 316 stainless hlau yog qhov yooj yim dua nyob rau hauv cov xwm txheej uas muaj cua sov, kev ntxhov siab, oxygen, thiab chlorides, txwv nws txoj kev ntseeg siab hauv ib puag ncig.
Corrosion Fatigue Resistance
Nrog nws lub zog siab thiab zoo dua corrosion kuj, 2205 stainless hlau muaj kev tiv thaiv zoo heev rau corrosion qaug zog. Qhov no ua rau nws zoo tagnrho rau cov khoom raug rau ob qho tib si corrosive media thiab cyclic loading, outperforming 316 stainless hlau nyob rau hauv xav tau daim ntawv thov.
Qhov txawv ntawm Mechanical Properties
Lub zog tawm los thiab lub zog tensile ntawm 2205 yog qhov zoo tshaj rau cov ntawm 316- kwv yees li ob npaug ntawm 316 stainless hlau- ua kom nws zoo dua haum rau siab - siab thiab kev ua haujlwm siab.
| Khoom | Duplex 2205 Stainless hlau | 316 Stainless hlau |
|---|---|---|
| Microstructure | Austenitic + Ferritic | Austenitic |
| Yield zog (MPa) | Ntau dua lossis sib npaug li 450 | Ntau dua lossis sib npaug li 205 |
| Tensile zog (MPa) | 620 – 880 | 515 – 620 |
| Elongation (%) | Ntau dua lossis sib npaug li 25 | Ntau dua lossis sib npaug li 40 |
| Hardness (HB) | Tsawg dua lossis sib npaug li 293 | Tsawg dua lossis sib npaug li 217 |
| Impact Toughness | Zoo | Zoo heev |
| Qhov ceev (g / cm³) | 7.8 | 8.0 |
| Modulus ntawm Elasticity (GPa) | ~200 | ~193 |
Qhov sib txawv ntawm qhov zoo thiab qhov tsis zoo
2205 Duplex Stainless hlau
I. Qhov zoo
- Corrosion Resistance: Lub synergistic nyhuv ntawm Cr, Mo, thiab N muab kev tiv thaiv corrosion -tshwj xeeb tiv thaiv Cl⁻- uas yog peb npaug ntau dua li ntawm SUS316L (nrog rau qhov ntsuas kub ntawm qhov kub siab tshaj lossis sib npaug li 35℃).
- High Strength & Lightweighting: Nrog ib tug yield zog ntawm ntau tshaj los yog sib npaug zos rau 450 MPa, bulkhead thickness yuav txo tau los ntawm 30%, yog li txo lub nkoj noj roj.
- SCC Resistance: Lub duplex microstructure inhibits kev nthuav tawm tawg, ua rau nws tsim nyog rau kev thauj cov khoom sib xyaw uas muaj dej hiav txwv lossis siab -kub roj thiab cov khoom siv tshuaj lom neeg.
- Tus nqi-Kev ua tau zoo: muaj cov ntsiab lus nickel tsawg; muab qhov kev kwv yees hloov pauv ntawm tus nqi npib tsib xee hauv 2025, nws muab tus nqi qis dua tag nrho lub neej.
II. Qhov tsis zoo
- Kev ua haujlwm nyuaj: Yuav tsum muaj kev tswj xyuas meej ntawm vuam cov khoom siv hluav taws xob (TIG vuam nrog ER2209 muab tub lim yog pom zoo); Nws yooj yim tawg thaum ua haujlwm txias.
- Tsawg-Kev Txwv Kub: Qhov hnyav poob qis ntawm qhov kub hauv qab -50 degree, ua rau nws tsis haum rau ultra-kub kub liquefied gas cargo tanks.
- Tus nqi pib: Tus nqi ntawm cov hlau phaj yog kwv yees li 15% mus rau 20% siab dua li ntawm SUS316L (txawm tias ntev -cov nqi kho mob qis dua).
316 Austenitic Stainless hlau
I. Qhov zoo
- Corrosion Resistance: 316 stainless hlau qhia tau zoo heev rau cov organic acids thiab sulfidic ib puag ncig (xws li H₂S). Nws kuj ua tau zoo tshwj xeeb hauv ntau cov xov xwm cryogenic, suav nrog ib puag ncig cuam tshuam nrog Liquefied Natural Gas (LNG).
- Kev ua tau zoo: Muaj cov ductility siab, nws yooj yim txias - ua haujlwm thiab tsim, ua rau nws tsim nyog rau kev tsim cov geometry nyuaj thiab khoov nruj.
- Cryogenic Performance: Nws tuav tau zoo heev toughness txawm nyob rau hauv tsis tshua muaj heev - qhov kub thiab txias ib puag ncig- mus rau -196℃- ua rau nws haum rau kev thauj mus los ntawm cryogenic liquefied tshuaj.
II. Qhov tsis zoo
- Lub zog qis: Nws lub zog tawm los yog kwv yees li 205 MPa; yog li ntawd, cov ntoo khaub lig tuab dua - ntu yuav tsum muaj rau siab - siab thiab hnyav - daim ntawv thov.
- Tsis zoo chloride Resistance: Nyob rau hauv ib puag ncig uas muaj kev ntxhov siab thiab chloride ions, 316 muaj kev cuam tshuam rau kev ua tsis tiav los ntawm kev ntxhov siab corrosion cracking -ib qho kev pheej hmoo uas yuav tshwm sim tshwj xeeb ntawm qhov kub siab tshaj li ntawm 60℃.
- Siab -Kev Txwv Kub: Ntev ntev rau qhov kub ntawm 400℃thiab 600℃tuaj yeem ua rau carbide nag lossis daus, yog li cuam tshuam nws cov corrosion kuj.
Qhov sib txawv ntawm thaj chaw thov
Thaum ib qhov project ntsib cov teeb meem xws li raug dej hiav txwv, siab chloride ion concentrations, siab siab, los yog corrosion qaug zog,2205 duplex stainless hlauyog qhov kev xaiv tsim nyog. Nws cov cheeb tsam daim ntawv thov raug suav nrog:
- Tubrog nkoj thiab Shipbuilding Engineering: Cov cua kub exchanger tub rau offshore roj platforms, seawater desalination evaporators thiab siab - siab piping, cargo tanks rau tshuaj tankers, thiab marine seawater cooling systems.
- Roj thiab Roj: Roj thiab roj cov kav dej uas muaj chloride ntsev thiab hydrogen sulfide, cov khoom siv hauv lub taub hau, thiab siab - cov hlab ntsha siab.
- Chemical and Environmental Engineering: Reactors rau kev ua cov xov xwm corrosive xws li acetic acid thiab formic acid, cov khoom siv tshuaj dawb, thiab cov khoom tseem ceeb rau kev kho dej khib nyiab.
Thaum daim ntawv thov scenario yog rhiab heev rau kev yooj yim ntawm fabrication thiab thawj tus nqi -thiab corrosive ib puag ncig kuj yog me me-316 stainless hlausawv cev rau kev xaiv nyiaj txiag ntau dua thiab siv tau. Nws cov cheeb tsam daim ntawv thov raug suav nrog:
- Cov Khoom Siv Kho Mob thiab Pharmaceuticals: Pharmaceuticals implants, surgical instruments, pharmaceutical reactors, and cleanroom piping.
- Architecture thiab Water Supply: Lub tsev ntaub thaiv phab ntsa thiab railings nyob rau hauv uas tsis yog - ib puag ncig ntug hiav txwv dej, thiab piping rau domestic dej system.
- Kev Siv Hluav Taws Xob thiab Tshuaj Siv Tshuaj: Cov tso tsheb hlau luam rau kev tuav cov tshuaj me me, thiab cov khoom siv hluav taws xob sib txawv (hauv qhov chaw qis -chloride).
Xaus
Hauv cov ntsiab lus, qhov tseem ceeb ntawm kev txiav txim siab thaum xaiv ntawm Duplex Stainless Steel 2205 thiab 316 yog ua raws cov khoom siv nrog cov kev ua haujlwm tshwj xeeb thiab cov kev xav tau ntawm qhov project. Thaum ib qhov project cuam tshuam nrog ib puag ncig uas muaj cov tshuaj chloride siab, siab siab, lossis kev ntxhov siab siab-thiab thaum lub sij hawm ntev- ruaj khov, tsis tshua muaj nqi tu, thiab kev muaj peev xwm yog qhov tseem ceeb-Duplex 2205 yog qhov kev xaiv zoo tshaj.
Piv txwv li, rau tej yaam num nyob rau hauv tus qauv corrosive ib puag ncig- qhov twg siab precision nyob rau hauv machining thiab complex geometries yuav tsum tau, thiab qhov twg cov peev nyiaj yog txwv -Stainless Steel 316 sawv cev rau tus nqi ntau dua - kev xaiv zoo. Tsis yog Duplex 2205 lossis 316 tsis muaj qhov zoo tshaj plaws ntawm lwm tus; es, xaiv cov khoom zoo tshaj plaws rau qhov kev thov tshwj xeeb yog qhov tseem ceeb.