Duplex Stainless Steel (DSS) yog ib hom stainless steel uas muaj kwv yees li sib npaug zos ntawm ferrite thiab austenite, nrog rau theem qis dua feem ntau ua tsawg kawg 30%. DSS feem ntau muaj cov ntsiab lus chromium ntawm 18% thiab 28% thiab cov ntsiab lus nickel ntawm 3% thiab 10%. Qee cov duplex stainless steels kuj muaj cov khoom sib xyaw xws li molybdenum (Mo), tooj liab (Cu), niobium (Nb), titanium (Ti), thiab nitrogen (N).
Cov hlau no muaj cov yam ntxwv ntawm ob qho tib si austenitic thiab ferritic stainless hlau. Piv rau ferritic stainless hlau, DSS muaj plasticity thiab toughness ntau dua, tsis muaj brittleness hauv chav tsev, thiab qhia txog kev txhim kho intergranular corrosion thiab weldability. Tib lub sijhawm, nws khaws cia 475 ° C brittleness thiab thermal conductivity siab ntawm ferritic stainless hlau thiab qhia txog superplasticity. Piv rau austenitic stainless hlau, DSS muaj zog dua thiab zoo dua tiv taus intergranular thiab chloride stress corrosion. DSS kuj muaj kev tiv thaiv pitting corrosion zoo heev thiab suav hais tias yog nickel-saving stainless hlau.
Cov Qauv thiab Hom
Vim nws muaj ob theem qauv ntawm austenite thiab ferrite, nrog txhua theem suav txog li ib nrab, DSS qhia txog cov yam ntxwv ntawm ob qho tib si austenitic thiab ferritic stainless hlau. Lub zog tso zis ntawm DSS yog txij li 400 MPa txog 550 MPa, uas yog ob npaug ntawm cov hlau stainless austenitic ib txwm muaj. DSS muaj zog dua, qis dua qhov kub hloov pauv brittle, thiab txhim kho kev tiv thaiv intergranular corrosion thiab weldability piv rau ferritic stainless hlau. Nws kuj tseem khaws qee yam khoom ferritic stainless hlau, xws li 475 ° C brittleness, thermal conductivity siab, thermal expansion coefficient qis, superplasticity, thiab magnetism. Piv rau austenitic stainless hlau, DSS muaj zog dua, tshwj xeeb tshaj yog lub zog tso zis, thiab txhim kho kev tiv thaiv pitting, kev ntxhov siab corrosion, thiab corrosion nkees.
DSS muaj plaub hom raws li nws cov tshuaj lom neeg sib xyaw: Cr18, Cr23 (Mo-free), Cr22, thiab Cr25. Hom Cr25 muaj peev xwm muab faib ua cov hlau tsis xeb txheem thiab super duplex. Ntawm cov no, hom Cr22 thiab Cr25 feem ntau siv. Hauv Suav teb, feem ntau ntawm cov qib DSS uas 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 Steel
1. Hom Low-Alloy: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 tiv thaiv kev ntxhov siab.
2. Hom hlau nruab nrab:Sawv cev los ntawm UNS S31803 (22Cr-5Ni-3Mo-0.15N), nrog PREN ntawm 32-33. Nws qhov kev tiv thaiv corrosion yog ntawm AISI 316L thiab 6% Mo + N austenitic stainless hlau.
3. Hom High-Alloy: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 Steel:Muaj cov molybdenum thiab nitrogen ntau, uas sawv cev los ntawm UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), qee zaum kuj muaj tungsten thiab tooj liab, nrog PREN siab dua 40. Nws yog qhov tsim nyog rau cov xwm txheej hnyav, muab cov khoom zoo heev thiab cov khoom siv kho tshuab, sib piv rau cov hlau tsis xeb super austenitic.
Cov Qib ntawm Duplex Stainless Steel hauv Suav teb
Tus qauv tshiab Suav teb GB/T 20878-2007 "Cov Qib Hlau Tsis Muaj Hlau Thiab Cov Khoom Siv Tshuaj Lom Zem" suav nrog ntau qib DSS, xws li 14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, thiab 12Cr21Ni5Ti. Tsis tas li ntawd, cov hlau duplex 2205 uas paub zoo sib xws rau qib Suav teb 022Cr23Ni5Mo3N.
Cov yam ntxwv ntawm Duplex Stainless Steel
Vim nws muaj ob theem qauv, los ntawm kev tswj cov tshuaj lom neeg thiab cov txheej txheem kho cua sov kom zoo, DSS muab cov txiaj ntsig 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 zog siab thiab chloride kev ntxhov siab corrosion tsis kam ntawm ferritic stainless hlau. Cov khoom zoo no tau ua rau DSS sai sai tsim ua cov khoom siv weldable txij li xyoo 1980, piv rau martensitic, austenitic, thiab ferritic stainless hlau. DSS muaj cov yam ntxwv hauv qab no:
1. Kev Tiv Thaiv Kev Nyuaj Siab ntawm Chloride:DSS uas muaj molybdenum ua rau muaj kev tiv thaiv zoo heev rau kev xeb ntawm chloride ntawm qib kev ntxhov siab qis. Thaum 18-8 austenitic stainless hlau feem ntau raug kev txom nyem los ntawm kev ntxhov siab xeb tawg hauv cov tshuaj chloride nruab nrab saum 60 ° C, DSS ua tau zoo hauv cov chaw uas muaj cov chlorides thiab hydrogen sulfide me me, ua rau nws tsim nyog rau cov hloov pauv cua sov thiab cov evaporators.
2. Kev Tiv Thaiv Kev Xeb Pitting:DSS muaj kev tiv thaiv xeb zoo heev. Nrog rau qhov sib npaug ntawm Pitting Resistance (PRE=Cr%+3.3Mo%+16N%), DSS thiab cov hlau tsis xeb austenitic qhia tau tias muaj peev xwm ua rau muaj qhov puas tsuaj zoo sib xws. DSS txoj kev tiv thaiv xeb ntawm qhov tawg thiab qhov tawg, tshwj xeeb tshaj yog rau cov hom uas muaj chromium ntau, nitrogen, zoo dua AISI 316L.
3. Kev qaug zog ntawm kev xeb thiab kev hnav tsis kam ntawm kev xeb:DSS ua tau zoo nyob rau hauv qee qhov chaw corrosive, ua rau nws haum rau cov twj tso kua mis, cov li qub, thiab lwm yam khoom siv fais fab.
4. Cov Khoom Siv Kho Tshuab:DSS muaj lub zog siab thiab lub zog qaug zog, nrog rau lub zog tso zis ob npaug ntawm 18-8 austenitic stainless hlau. Hauv lub xeev annealed kua, nws qhov ntev ncav cuag 25%, thiab nws cov nqi toughness AK (V-notch) tshaj 100 J.
5. Kev vuam tau:DSS muaj peev xwm vuam tau zoo nrog qhov tsis tshua muaj kev tawg kub. Feem ntau tsis tas yuav tsum tau ua kom sov ua ntej vuam, thiab kev kho cua sov tom qab vuam tsis tas yuav tsum tau ua, uas tso cai rau kev vuam nrog 18-8 austenitic stainless hlau lossis carbon hlau.
6. Ua Haujlwm Kub:Cov hlau tsis xeb uas muaj chromium tsawg (18% Cr) DSS muaj qhov kub ua haujlwm kub dav dua thiab tsis kam ntau dua li cov hlau tsis xeb 18-8 austenitic, uas tso cai rau kev dov ncaj qha rau hauv cov phaj yam tsis tas yuav forging. Cov hlau tsis xeb uas muaj chromium ntau (25% Cr) DSS nyuaj dua me ntsis rau kev ua haujlwm kub tab sis tuaj yeem tsim ua cov phaj, cov kav dej, thiab cov xov hlau.
7. Ua Haujlwm Txias:DSS ua rau muaj kev ua haujlwm tawv dua thaum ua haujlwm txias dua li 18-8 austenitic stainless hlau, xav tau kev ntxhov siab pib ntau dua rau kev hloov pauv thaum lub sijhawm ua yeeb nkab thiab phaj.
8. Kev Ua Haujlwm Thermal thiab Kev Nthuav Dav:DSS muaj cov thermal conductivity siab dua thiab cov coefficients thermal expansion qis dua piv rau cov hlau austenitic stainless hlau, ua rau nws tsim nyog rau cov khoom siv hauv pem teb thiab tsim cov phaj sib xyaw. Nws kuj tseem zoo tagnrho rau cov tub ntxhais hloov pauv cua sov, nrog rau kev ua haujlwm hloov pauv cua sov siab dua li cov hlau austenitic stainless hlau.
9. Kev tawg yooj yim:DSS tseem khaws cov qauv brittleness ntawm cov hlau stainless hlau uas muaj chromium siab thiab tsis haum rau siv thaum kub tshaj 300 ° C. Cov chromium tsawg dua hauv DSS, nws yuav tsis yooj yim rau cov theem brittle xws li theem sigma.
Cov txiaj ntsig ntawm Womic Steel
Womic Steel yog ib lub tuam txhab ua cov hlau tsis xeb duplex, muab ntau yam khoom xws li cov kav dej, cov phaj, cov tuav, thiab cov xov hlau. Peb cov khoom ua raws li cov qauv thoob ntiaj teb tseem ceeb thiab tau txais daim ntawv pov thawj ISO, CE, thiab API. Peb tuaj yeem ua raws li kev saib xyuas ntawm cov neeg thib peb thiab kev tshuaj xyuas zaum kawg, kom ntseeg tau tias cov qauv zoo tshaj plaws tau ua tiav.
Womic Steel cov khoom siv hlau tsis xeb duplex paub txog lawv cov:
Cov Khoom Siv Raw Zoo:Peb tsuas yog siv cov khoom siv zoo tshaj plaws los xyuas kom meej tias cov khoom ua tau zoo tshaj plaws.
Cov Txuj Ci Tsim Khoom Siab Tshaj Plaws:Peb cov chaw tsim khoom zoo tshaj plaws thiab pab pawg neeg muaj kev paub dhau los ua rau peb tsim tau cov hlau tsis xeb duplex nrog cov tshuaj lom neeg thiab cov khoom siv kho tshuab.
Cov Kev Daws Teeb Meem Uas Kho Tau:Peb muaj ntau yam loj thiab me kom tau raws li qhov xav tau ntawm peb cov neeg siv khoom.
Kev Tswj Xyuas Zoo:Peb cov txheej txheem tswj xyuas zoo kom ntseeg tau tias txhua yam khoom ua tau raws li cov qauv siab tshaj plaws ntawm kev ua tau zoo.
Kev ncav cuag thoob ntiaj teb:Nrog lub network xa khoom muaj zog, Womic Steel muab cov hlau tsis xeb duplex rau cov neeg siv khoom thoob ntiaj teb, txhawb nqa ntau yam lag luam nrog cov ntaub ntawv txhim khu kev qha thiab ua tau zoo.
Xaiv Womic Steel rau koj cov kev xav tau duplex stainless hlau thiab paub txog qhov zoo thiab kev pabcuam tsis sib xws uas ua rau peb sib txawv hauv kev lag luam.
Lub sijhawm tshaj tawm: Lub Xya Hli-29-2024