Cov lus teb luv yog yog, kojtauWELD 316 Stainless hlau nrog 308 cev tub lim rau hauv ntau kis, feem ntau yog cov cai, thiab kev cia siab ib puag ncig, thiab kev cia siab. Hauv qab no, peb tawg cov txheej txheem kev ntseeg siab, cov kev txwv, thiab kev coj ua zoo tshaj plaws rau kev sib xyaw no.
Qhov sib txawv ntawm 316 thiab 308
Yuav kom nkag siab qhov sib piv ntawm cov ntaub ntawv no, ua ntej sib piv lawv cov lus:
| Hlau | Cr | Ni | Mo | C | Thawj siv |
|---|---|---|---|---|---|
| 316 | 16–18% | 10–14% | 2–3% | Tsawg dua los yog sib npaug rau 0. 08% | High corrosion resistance (marine, tshuaj). |
| 308 | 19–21% | 10–12% | 0% | Tsawg dua los yog sib npaug rau 0. 08% | VUAM 304 / 304L stainless hlau. |
Tseem Ceeb:
Molybdenum (mo): Qhov tsis muaj Molybdenum hauv 308 muab tub lim yog qhov sib txawv tshaj plaws. Mo txhim kho kom pitting thiab crevice corrosion hauv chloride ib puag ncig (piv txwv li, seawater).
Thaum twg yog 308 muab tub lim siv tau rau kev siv vuam 316?
Cov ntawv thov tsis yog-tseem ceeb:
Rau cov tsis-qauv lossis tsis yog xeb ib puag ncig (piv txwv li, cov rooj tog hauv sab hauv tsev, cov ntaub ua kom zoo nkauj), 308 ua kom muaj peev xwm ua rau muaj peev xwm.
Tus Weld yuav muaj lub zog txaus thiab kev ua kom txaus rau cov laj thawj dav dav.
Pob nyiaj siv lossis muaj kev txwv tsis pub muaj:
Yog tias 316l filler tsis muaj, 308 yog ib qho kev hloov chaw rau kev kho kev kho ib ntus lossis cov dej num tsawg.
Thermal Cycling Kev Zam:
308 qhov qis dua thermal expansion coefficient (ze rau 316 tshaj 316L) tuaj yeem txo cov distortion hauv cov ntu nyias.
Cov kev txwv thiab kev pheej hmoo
Txo corrosion tsis kam:
Weld cheeb tsam yuav tsis muaj Molybdenum, ua rau nws muaj kev cuam tshuam rau pitting hauv chloride ib puag ncig (piv txwv, cov nroj tsuag ntug dej hiav txwv, tshuaj lom neeg).
Tus yam ntxwv: Lub 316 kav hlau welded nrog 308 muab tub lim rau corrode sai dua ntawm Weld hauv Seasater.
Galvanic corrosion kev pheej hmoo:
Kev sib cais tsis sib thooj ntawm Weld (308) thiab lub hauv paus hlau (316) tuaj yeem tsim cov galvanic cov khub niam txiv muaj peev xwm tsim cov xov xwm zoo nkauj, tsuj kev xeb.
Chaws:
Cov qauv zoo liASME BPVClossisAws D1.6Tej zaum yuav xav tau cov hlau sib txuam nrog cov hlab ntsha siab lossis cov khoom tseem ceeb.
Kev coj ua zoo tshaj plaws rau kev siv 308 muab tub lim rau 316
Tom qab Weld Passivation:
Siv nitric acid lossis citric acid passivation los kho lub weld cov txheej oxide thiab txhim kho corrosion tsis kam.
Zam kev sib kis:
Txwv tsis pub siv rau ib puag ncig nrog cov chlorides minimal, acids, lossis sulfides.
Xav Txog Kev Ua Haujlwm:
Rau cov pob qij txha tseem ceeb, siv316L Muab Tub Luam Ntawv(ER316L) los khaws cov ntsiab lus, lossis309L Muab Tub Kawm(Ntau dua CR / NI) rau kev tiv taus corrosion zoo dua.
Lwm txoj hau kev rau 308 muab tub lim
Er316l:
Qhov Matces 316 qhov sib xyaw (nrog mo), zoo tagnrho rau cov chaw muaj kev xeb.
Txo cov ntsiab lus txo cov pa roj carbon minimizes carbide nag lossis daus hauv cov chaw kub-cuam tshuam rau cov aav.
Er309l:
Siab chromium thiab npib tsib xee (23% cr, 13% ni) txuas hniav dissimilar hlau (piv txwv li 316 rau carbon hlau) thiab muab cov oxidation zoo dua.
Kev Lag Luam Kev Lag Luam
Roj & Roj: Zam 308 muab tub lim rau cov kev pabcuam hauv kev ua haujlwm hauv kev ua haujlwm (h₂s) vim yog corrosion txaus ntshai; 316L lossis tus tuab neeg ua hauj lwm yog nyiam.
Khoom noj khoom haus / tshuaj: Siv tau rau cov khoom tsis siv hluav taws xob yog tsau tshuaj tsis tu ncua.
Kev ua tsev: Haum rau sab hauv tsev tab sis pheej hmoo rau ntug hiav txwv Façades.
Xaus: Ua nrog ceev faj
Thaum vuam 316 nrog 308 muab tub lim tawm yog siv tau thev naus laus zis txuag tau, nws cov tub lag luam txuag tau nyiaj rau kev ua haujlwm corrosion tsis kam. Rau cov tsis yog-qhov tseem ceeb, qhuav, lossis cov ntawv thov tsawg, cov kev sib xyaw ua ke no. Txawm li cas los xij, nyob rau hauv ib puag ncig kev txom nyem lossis tswj kev lag luam,ib txwm xaiv rau 316l fillerTxhawm rau kom muaj kev ntev thiab ua raws.
Ua ntej kev ua tiav, txhawb txoj haujlwm cov kev qhia, ntsuas kev sib kis ib puag ncig, thiab ua ntej kev ua tau zoo tshaj plaws ntawm lub sijhawm luv nqi. Thaum tsis ntseeg, koom nrog lub engineer rau kev xaiv cov khoom siv - vim tias ib qho kev xaiv weld-vim tias tus nqi tseem ceeb nyob deb dua li tus nqi ntawm cov neeg muab tub ua ke.
