Zeron 100 / F55 (UNS S32760): Lub Tungsten -Txhim kho Super Duplex Stainless Hlau

 

Dab tsi yog cov tshuaj muaj pes tsawg leeg, qhov txiaj ntsig tseem ceeb, thiab thawj daim ntawv thov ntawm Zeron 100 super duplex stainless hlau?
Zeron 100 has a balanced composition of about 25% Cr, 7% Ni, 3.5% Mo, 0.7% W, 0.25% N, and 1% Cu. This gives it a very high Pitting Resistance Equivalent Number (PREN >40) rau qhov zoo tshaj pitting / crevice corrosion kuj thiab lub zog ua haujlwm siab heev (~ 550 MPa yield). Nws qhov txiaj ntsig tseem ceeb yog xa cov kev ua tau zoo ze rau cov nickel alloys ntawm ib feem ntawm tus nqi. Nws tau teev tseg rau cov khoom tseem ceeb hauv cov roj av thiab roj (risers, manifolds), seawater txias tshuab, tshuaj tankers, thiab flue gas desulfurization scrubbers.

Yuav ua li cas yog nws corrosion kuj piv rau standard duplex 2205 thiab lwm yam super duplex qib?
Zeron 100 muab cov kauj ruam tseem ceeb hauv kev tiv thaiv corrosion los ntawm duplex 2205, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig nrog cov tshuaj chloride siab, pH tsis tshua muaj, thiab muaj H2S (kev pabcuam qaub). Cov nyhuv synergistic ntawm tungsten nrog molybdenum ntxiv txhim kho nws cov kev tiv thaiv rau hauv cheeb tsam corrosion. Piv rau lwm cov qib super duplex zoo li 2507, nws qhov sib ntxiv ntawm tooj liab thiab tungsten muab kev ua haujlwm zoo dua hauv kev txo cov kua qaub thiab kev ua haujlwm dav dav hauv cov chaw sib xyaw tshuaj, muab ntau yam kev daws teeb meem rau cov mob hnyav.

Dab tsi yog qhov tseem ceeb tshaj plaws rau kev vuam thiab fabricating Zeron 100?
Vuam Zeron 100 xav tau cov txheej txheem nruj tswj kom tsis txhob muaj teeb meem cuam tshuam rau theem nag lossis daus. Cov kev coj ua tseem ceeb suav nrog kev siv qhov sib txuam lossis ntau dua - cov hlau muab tub lim (piv txwv li, Zeron 100X), tswj qhov kub ntawm qhov sib cuam tshuam tsawg heev (feem ntau qis dua 100 ° C), thiab ua tib zoo tswj cov cua kub tawm. Nws lub zog siab xav tau cov cuab yeej muaj zog ntau dua rau kev tsim thiab machining. Fabrication yuav tsum tsuas yog ua los ntawm cov khw uas muaj pov thawj kev txawj ntse hauv super duplex stainless hlau thiab cov txheej txheem vuam tsim nyog los xyuas kom meej cov khoom kawg khaws nws cov khoom tsim.

Nyob rau hauv daim ntawv thov twg puas nqis peev hauv Zeron 100 muab qhov zoo tshaj plaws lifecycle nqi kom zoo dua?
Kev nqis peev yog tsim nyog rau hauv cov ntawv thov uas cov khoom siv tsis ua haujlwm ua rau muaj kev lag luam loj, kev nyab xeeb, lossis kev pheej hmoo ib puag ncig. Qhov no suav nrog cov roj av hauv hiav txwv thiab cov roj av, dej hiav txwv -cov khoom siv hluav taws xob txias txias hauv cov chaw tsim hluav taws xob, thiab cov txheej txheem tseem ceeb hauv cov kav dej hauv cov nroj tsuag tshuaj tuav cov tshuaj chlorides thiab cov kua qaub. Thaum nws cov nqi pib yog siab dua tus qauv duplex, nws qhov kev ua tau zoo tshaj plaws feem ntau tshem tawm qhov xav tau ntawm cov tshuaj tiv thaiv, kev tiv thaiv cathodic, los yog hloov ntxov ntxov, ua rau txo qis tag nrho cov tswv cuab ntawm lub cuab tam lub neej.

Dab tsi kawg specification thiab cov kauj ruam kev ruaj ntseg zoo yog yuav tsum tau rau qhov hwm alloy?
Kev yuav khoom yuav tsum yog raws li cov lus qhia ntxaws ntxaws uas yuav tsum tau muaj daim ntawv pov thawj tag nrho ntawm cov zeb xeem uas lees paub qhov tseeb chemistry -tungsten, tooj liab, thiab nitrogen cov ntsiab lus- thiab lav qhov tsawg kawg nkaus PREN. Kev ntsuam xyuas qhov hnyav ntawm qhov tsim kub yog feem ntau yuav tsum tau. Ib qho kev ntsuas kev tsim nyog ntawm cov txheej txheem vuam (WPQR) yuav tsum tau ua ua ntej vuam ntau lawm. Rau cov khoom tseem ceeb, tsis yog - kev sim ua kom puas tsuaj thiab xaiv qhov kev ntsuam xyuas corrosion ntawm welds raug pom zoo kom muaj kev ncaj ncees. Kev koom tes nrog lub tuam txhab muaj npe nrov thiab cov kws paub txog kev tsim khoom yog tsis muaj - sib tham.