Duplex Stainless Steel (DSS) yog ib hom stainless hlau uas muaj kwv yees li qhov sib npaug ntawm ferrite thiab austenite, nrog rau theem qis feem ntau ua kom tsawg kawg yog 30%.DSS feem ntau muaj cov ntsiab lus chromium ntawm 18% thiab 28% thiab cov ntsiab lus nickel ntawm 3% thiab 10%.Qee qhov duplex stainless hlau kuj muaj cov ntsiab lus alloying xws li molybdenum (Mo), tooj liab (Cu), niobium (Nb), titanium (Ti), thiab nitrogen (N).
Cov hlau no sib txuas cov yam ntxwv ntawm ob qho tib si austenitic thiab ferritic stainless hlau.Piv rau ferritic stainless hlau, DSS muaj ntau dua plasticity thiab toughness, tsis muaj chav kub brittleness, thiab qhia tau hais tias kev txhim kho intergranular corrosion kuj thiab weldability.Nyob rau tib lub sijhawm, nws khaws cov 475 ° C brittleness thiab siab thermal conductivity ntawm ferritic stainless hlau thiab nthuav tawm superplasticity.Piv rau austenitic stainless hlau, DSS muaj lub zog ntau dua thiab ua haujlwm zoo dua rau kev cuam tshuam intergranular thiab chloride kev ntxhov siab.DSS kuj muaj pitting corrosion kuj zoo heev thiab suav hais tias yog ib qho nickel-txuag stainless hlau.
Qauv thiab Hom
Vim nws cov qauv dual-theem ntawm austenite thiab ferrite, nrog rau txhua theem accounting rau kwv yees li ib nrab, DSS nthuav tawm cov yam ntxwv ntawm ob qho tib si austenitic thiab ferritic stainless hlau.Lub zog tawm los ntawm DSS yog li ntawm 400 MPa rau 550 MPa, uas yog ob npaug ntawm cov hlau tsis zoo austenitic.DSS muaj zog dua, txo qis kev hloov pauv kub, thiab txhim kho intergranular corrosion kuj thiab weldability piv rau ferritic stainless hlau.Nws kuj tseem khaws qee cov khoom ferritic stainless hlau, xws li 475 ° C brittleness, thermal conductivity, tsis tshua muaj thermal expansion coefficient, superplasticity, thiab hlau nplaum.Piv rau austenitic stainless hlau, DSS muaj zog dua, tshwj xeeb tshaj yog lub zog tawm los, thiab txhim kho kev tiv thaiv rau pitting, kev nyuaj siab corrosion, thiab corrosion qaug zog.
DSS tuaj yeem muab faib ua plaub hom raws li nws cov tshuaj muaj pes tsawg leeg: Cr18, Cr23 (Mo-free), Cr22, thiab Cr25.Hom Cr25 tuaj yeem muab faib ua tus qauv thiab super duplex stainless hlau.Ntawm cov no, Cr22 thiab Cr25 hom tau siv ntau dua.Hauv Suav teb, feem ntau ntawm DSS qib tau txais yuav yog tsim nyob rau hauv Sweden, suav nrog 3RE60 (Cr18 hom), SAF2304 (Cr23 hom), SAF2205 (Cr22 hom), thiab SAF2507 (Cr25 hom).
Hom Duplex Stainless Hlau
1. Tsawg-Alloy Hom:Sawv cev los ntawm UNS S32304 (23Cr-4Ni-0.1N), cov hlau no tsis muaj molybdenum thiab muaj Pitting Resistance Equivalent Number (PREN) ntawm 24-25.Nws tuaj yeem hloov AISI 304 lossis 316 hauv kev siv zog tiv thaiv corrosion.
2. Medium-Alloy Hom:Sawv cev los ntawm UNS S31803 (22Cr-5Ni-3Mo-0.15N), nrog PREN ntawm 32-33.Nws cov corrosion kuj yog nruab nrab ntawm AISI 316L thiab 6% Mo + N austenitic stainless hlau.
3. High-Alloy Hom:Feem ntau muaj 25% Cr nrog rau molybdenum thiab nitrogen, qee zaum tooj liab thiab tungsten.Sawv cev los ntawm UNS S32550 (25Cr-6Ni-3Mo-2Cu-0.2N), nrog PREN ntawm 38-39, cov hlau no muaj kev tiv thaiv corrosion zoo dua li 22% Cr DSS.
4. Super Duplex Stainless Hlau:Muaj cov qib siab ntawm molybdenum thiab nitrogen, sawv cev los ntawm UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), qee zaum kuj muaj cov tungsten thiab tooj liab, nrog PREN saum toj 40. Nws yog tsim rau hnyav xov xwm, muab cov corrosion zoo heev thiab txhua yam. khoom, piv rau super austenitic stainless hlau.
Qib ntawm Duplex Stainless Hlau hauv Suav teb
Tus qauv Suav tshiab GB/T 20878-2007 "Stainless thiab Heat-Resistant Steel Qib thiab Tshuaj Chemical" suav nrog ntau qib DSS, xws li 14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, thiab 12Cr21Ni5Ti.Tsis tas li ntawd, tus paub zoo 2205 duplex steel sib haum rau Suav qib 022Cr23Ni5Mo3N.
Cov yam ntxwv ntawm Duplex Stainless Hlau
Vim nws cov qauv dual-theem, los ntawm kev tswj cov tshuaj muaj pes tsawg leeg thiab cov txheej txheem kho cua sov kom zoo, DSS muab qhov zoo ntawm ob qho tib si ferritic thiab austenitic stainless hlau.Nws tau txais qhov zoo heev toughness thiab weldability ntawm austenitic stainless hlau thiab lub siab zog thiab chloride kev nyuaj siab corrosion kuj ntawm ferritic stainless hlau.Cov khoom zoo tshaj no tau ua rau DSS tau tsim kho sai raws li cov khoom siv sib txuas txij li xyoo 1980s, ua piv rau martensitic, austenitic, thiab ferritic stainless hlau.DSS muaj cov yam ntxwv hauv qab no:
1. Chloride Stress Corrosion Resistance:Molybdenum-muaj DSS ua pov thawj zoo heev rau cov tshuaj chloride kev nyuaj siab corrosion ntawm qis kev ntxhov siab.Thaum 18-8 austenitic stainless hlau yuav raug kev txom nyem los ntawm kev ntxhov siab corrosion nyob rau hauv nruab nrab chloride tov saum toj no 60 ° C, DSS ua tau zoo nyob rau hauv ib puag ncig uas muaj chlorides thiab hydrogen sulfide, ua rau nws haum rau tshav kub exchangers thiab evaporators.
2. Pitting Corrosion Resistance:DSS muaj zoo heev pitting corrosion kuj.Nrog tib Pitting Resistance sib npaug (PRE = Cr% + 3.3Mo% + 16N%), DSS thiab austenitic stainless hlau qhia zoo li qhov tseem ceeb pitting peev xwm.DSS's pitting thiab crevice corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv high-chromium, nitrogen-muaj hom, tshaj AISI 316L.
3. Corrosion Fatigue thiab Hnav Corrosion Resistance:DSS ua tau zoo hauv qee qhov chaw corrosive, ua rau nws haum rau cov twj, li qub, thiab lwm yam khoom siv fais fab.
4. Mechanical Properties:DSS muaj lub zog siab thiab qaug zog, nrog lub zog tawm los ob zaug ntawm 18-8 austenitic stainless hlau.Hauv lub xeev kev daws teeb meem, nws qhov elongation nce mus txog 25%, thiab nws tus nqi toughness AK (V-notch) tshaj 100 J.
5. Weldability:DSS muaj zoo weldability nrog tsawg kub cracking tendencies.Preheating feem ntau tsis tas yuav tsum tau ua ntej vuam, thiab kev kho cua sov tom qab vuam yog qhov tsis tsim nyog, tso cai rau vuam nrog 18-8 austenitic stainless hlau lossis carbon hlau.
6. Kub ua haujlwm:Tsawg-chromium (18% Cr) DSS muaj qhov dav dav kub ua haujlwm kub thiab qis tsis kam tshaj 18-8 austenitic stainless hlau, tso cai rau dov ncaj qha rau hauv daim hlau tsis muaj forging.High-chromium (25% Cr) DSS yog ib qho nyuaj me ntsis rau kev ua haujlwm kub tab sis tuaj yeem ua rau hauv daim hlau, cov kav dej, thiab cov xov hlau.
7. Ua haujlwm txias:DSS nthuav qhia kev ua haujlwm hnyav dua thaum ua haujlwm txias dua 18-8 austenitic stainless hlau, yuav tsum muaj kev ntxhov siab ntau dua rau kev deformation thaum lub sijhawm ua yeeb nkab thiab phaj.
8. Thermal Conductivity thiab Expansion:DSS muaj cov thermal conductivity ntau dua thiab qis dua thermal expansion coefficient piv rau austenitic stainless hlau, ua rau nws tsim nyog rau cov khoom siv hauv ob sab phlu thiab ua cov phaj sib xyaw.Nws kuj yog qhov zoo tagnrho rau cov cua kub exchanger tube cores, nrog rau kev sib pauv kub ntau dua li austenitic stainless hlau.
9. Brittleness:DSS khaws cov brittleness tendencies ntawm high-chromium ferritic stainless hlau thiab yog tsis haum rau siv nyob rau hauv kub siab tshaj 300 ° C.Qhov qis dua cov ntsiab lus chromium hauv DSS, qhov tsawg dua nws yog rau theem nkig xws li sigma theem.
Womic Steel's Production Advantages
Womic Steel yog cov chaw tsim khoom ntawm duplex stainless hlau, muab ntau yam khoom siv xws li cov kav dej, phaj, tuav, thiab cov xov hlau.Peb cov khoom ua raws li cov qauv thoob ntiaj teb loj thiab tau lees paub ISO, CE, thiab API.Peb tuaj yeem ua raws li kev saib xyuas thib peb thiab kev soj ntsuam zaum kawg, ua kom cov qauv zoo tshaj plaws tau ua tiav.
Womic Steel's duplex stainless hlau khoom yog paub rau lawv:
High-Quality Raw Materials:Peb tsuas yog siv cov ntaub ntawv zoo tshaj plaws los xyuas kom meej cov khoom ua tau zoo.
Advanced Manufacturing Techniques:Peb cov chaw tsim khoom hauv xeev-ntawm-tus-kos duab thiab cov neeg ua haujlwm paub dhau los ua kom peb tsim duplex stainless hlau nrog cov tshuaj muaj tseeb thiab cov khoom siv kho tshuab.
Customizable Solutions:Peb muab ntau qhov ntau thiab tsawg thiab specifications kom tau raws li cov kev xav tau tshwj xeeb ntawm peb cov neeg siv khoom.
Stringent Quality Control:Peb cov txheej txheem tswj xyuas nruj kom ntseeg tau tias txhua yam khoom ua tau raws li cov qauv kev ua tau zoo tshaj plaws.
Ntiaj teb no ncav cuag:Nrog lub zog xa tawm network, Womic Steel muab duplex stainless hlau rau cov neeg siv khoom thoob ntiaj teb, txhawb nqa ntau yam kev lag luam nrog cov ntaub ntawv txhim khu kev qha thiab ua haujlwm siab.
Xaiv Womic Steel rau koj cov kev xav tau duplex stainless hlau thiab paub txog qhov tsis sib xws thiab kev pabcuam uas ua rau peb sib nrug hauv kev lag luam.
Post lub sij hawm: Lub Xya hli ntuj-29-2024