1. Hastelloy G-30 yog dab tsi, thiab dab tsi ua rau nws cov yeeb nkab seamless tsim tshwj xeeb hauv kev lag luam chemical?
Hastelloy G-30 (UNS N06030) yog npib tsib xee-chromium- hlau-molybdenum superalloy tshwj xeeb uas tsim los rau tshwj xeeb tiv thaiv oxidizing thiab complex tshuaj ib puag ncig. Txawm hais tias muaj ntau cov nickel alloys ua tau zoo hauv kev txo qis (xws li hydrochloric acid), G-30 lub zog nyob hauv nws cov khoom sib npaug: cov ntsiab lus chromium siab (~ 29%) muab kev tiv thaiv zoo tshaj plaws tiv thaiv oxidizing xov xwm, thaum ntxiv molybdenum (~ 5.5%), tungsten (~ 2.5%), thiab tooj liab (~ 2%) xa cov kua qaub sib xyaw hauv zos.
Lub seamless yeeb nkab daim ntawv ntawm no alloy yog tsim los ntawm cov txheej txheem xws li extrusion los yog teb tho, tsim ib tug nruam, homogeneous qauv yam tsis muaj longitudinal welds. Daim ntawv no yog qhov tseem ceeb rau cov ntawv thov tseem ceeb vim nws:
Tshem tawm cov vuam seam tsis yooj yim: Hauv cov kev pabcuam corrosive heev, tshav kub- cuam tshuam thaj chaw (HAZ) ntawm qhov vuam tuaj yeem yog qhov tsis muaj zog rau kev pib corrosion. Seamless kev tsim kho tshem tawm qhov kev pheej hmoo no tag nrho.
Muab cov qauv kev ncaj ncees zoo tshaj plaws: Cov qauv nplej zoo ib yam nyob ib puag ncig tag nrho ib puag ncig kom ntseeg tau tias cov khoom siv zoo sib xws thiab kev tiv thaiv corrosion, tseem ceeb heev rau kev siv siab - siab.
Muab kev txhim kho saum npoo zoo: Sab hauv ntawm cov kav dej seamless feem ntau yog smoother dua welded lwm txoj kev, txo qhov chaw rau pitting los yog crevice corrosion thiab txo kev sib txhuam rau cov dej ntws.
Hauv kev lag luam tuav kub sulfuric acid, phosphoric acid nrog fluorides, los yog nitric / hydrofluoric acid sib tov, kev sib xyaw ntawm G-30's chemical resistance nrog cov qauv kev ntseeg siab ntawm seamless piping tsim ib qho indispensable tshuaj rau cov txheej txheem tseem ceeb.
2. Nyob rau hauv dab tsi tshwj xeeb corrosive ib puag ncig ua Hastelloy G-30 seamless kav ua tau zoo tshaj lwm yam corrosion-resistant alloys?
Hastelloy G-30 seamless kav qhia tau hais tias superior kev ua tau zoo nyob rau hauv ob peb qhov tshwj xeeb, aggressive ib puag ncig qhov twg lwm yam alloys fim txwv:
Kub, Concentrated Sulfuric Acid: G-30 qhia tshwj xeeb tiv thaiv sulfuric acid nyob rau hauv ib tug dav concentration thiab kub ntau yam, tshwj xeeb tshaj yog outperforming txheem stainless steels thiab txawm ib co ntau dua-nickel alloys nyob rau hauv ntau dua 70% ntawm qhov kub thiab txias.
Contaminated Phosphoric Acid: Nyob rau hauv ntub dej- txheej txheem phosphoric acid tsim, qhov twg cov kua qaub muaj aggressive impurities xws li fluorides, chlorides, thiab sulfuric acid, G-30 tuav tsis taus qhov twg ntau lwm txoj kev txom nyem los ntawm pitting, crevice corrosion, los yog kev nyuaj siab corrosion cracking.
Mixed Acid Ib puag ncig: Cov hlau zoo tshaj plaws hauv cov khoom sib xyaw uas muaj nitric / hydrofluoric acids lossis sulfuric / nitric acids, feem ntau hauv tshuaj synthesis, hlau pickling, thiab nuclear roj reprocessing daim ntaub ntawv.
Oxidizing Chloride Media: Txawm hais tias tsis muaj peev xwm tiv taus cov ntshiab txo cov chlorides li qee cov hlau, G-30 ua tau zoo hauv oxidizing chloride ib puag ncig (muaj ferric lossis cupric ions) qhov twg nws cov ntsiab lus chromium siab tswj kev ua haujlwm.
Kev sib piv:
vs. 316L Stainless: Ua tau zoo tshaj plaws nyob rau hauv tag nrho cov cheeb tsam saum toj no, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj chlorides.
vs. Alloy 20: Kev tiv thaiv zoo dua rau sulfuric acid thiab cov kua qaub sib xyaw.
vs. Hastelloy C-276: Txawm hais tias C-276 yuav ua tau zoo dua hauv kev txo qis, G-30 feem ntau ua haujlwm tau zoo hauv cov oxidizing acids, tshwj xeeb tshaj yog kub concentrated sulfuric acid.
3. Dab tsi yog qhov tseem ceeb ntawm kev tsim thiab vuam kev txiav txim siab tshwj xeeb rau Hastelloy G-30 seamless piping systems?
Kev tsim thiab vuam zoo yog qhov tseem ceeb rau kev tswj xyuas qhov corrosion ntawm Hastelloy G-30 piping systems:
Vuam txheej txheem: Gas Tungsten Arc Vuam (GTAW / TIG) yog txoj kev nyiam tshaj plaws rau hauv paus thiab sau cov ntawv hla, muab qhov huv tshaj plaws, tswj tau zoo tshaj plaws welds. Shielded Hlau Arc Vuam (SMAW) tuaj yeem siv rau cov ntawv thov tshwj xeeb nrog cov electrodes sib xws.
Filler Hlau Xaiv: Siv cov khoom sib xyaw ua ke ntawm cov hlau (ERNiCrMo-11 lossis sib npaug) lossis cov khoom siv me ntsis zoo li ERNiCrMo-10 rau kev txhim kho corrosion hauv cov hlau vuam. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev pabcuam hnyav.
Kev Tiv Thaiv Kev Tiv Thaiv: Lub zog tsis muaj zog tiv thaiv roj yog qhov tseem ceeb. Rov qab purging nrog argon yog yuav tsum tau los tiv thaiv oxidation ("qab zib") ntawm lub hauv paus sab ntawm welds, uas yuav cuam tshuam corrosion kuj.
Kev tswj cov cua sov: Khaws cov cua kub qis mus rau nruab nrab thiab tswj qhov kub ntawm qhov sib cuam tshuam (feem ntau qis dua 250℃F / 120 degree) kom txo qis carbide nag lossis daus hauv tshav kub- thaj tsam cuam tshuam, uas tuaj yeem ua rau muaj kev cuam tshuam ntawm kev sib tsoo hauv kev pabcuam corrosive.
Post-Kev kho cua sov: Thaum G-30 feem ntau yog siv nyob rau hauv qhov zoo li-welded rau ntau daim ntawv thov, kev daws teeb meem annealing (2150-2250℃F ua raws li quench ceev) tej zaum yuav raug teev rau cov kev pab cuam nyob rau hauv qhov kev ua phem tshaj plaws los xyuas kom meej corrosion kuj zoo.
4. Cov kev tswj xyuas zoo thiab kev soj ntsuam dab tsi yog qhov tseem ceeb rau Hastelloy G-30 seamless kav hauv kev pabcuam tseem ceeb?
Rau cov ntawv thov uas tsis ua haujlwm tsis yog qhov kev xaiv, kev tswj xyuas kom zoo yog qhov tseem ceeb:
Cov ntaub ntawv pov thawj: Tag nrho traceability nrog zeb xeem daim ntawv pov thawj lees paub tshuaj muaj pes tsawg leeg, txhua yam khoom, thiab kev kho cua sov ua raws li ASTM B619, B622, los yog B626 tus qauv.
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):
Kev Ntsuas Ultrasonic (UT): txhawm rau txheeb xyuas qhov tsis zoo ntawm sab hauv, nrog rau kev saib xyuas tshwj xeeb rau cov yeeb nkab xaus qhov tsis xws luag.
Eddy Current Testing: Rau qhov chaw thiab nyob ze -surface flaw detection.
Dye Penetrant Testing (PT): Ntawm qhov chaw weldments thiab qhov chaw tseem ceeb los txheeb xyuas qhov chaw - tawg qhov tsis xws luag.
Kev Ntsuam Xyuas Corrosion: Rau cov ntawv thov tseem ceeb heev, kev ntsuam xyuas kev sib xyaw ua ke ntawm ASTM G28 Txoj Kev A yuav raug teev los xyuas kom meej tias cov khoom tsis tau rhiab heev thaum tsim khoom.
Dimensional Verification: nruj me ntsis xyuas ntawm sab nraud txoj kab uas hla, phab ntsa thickness (nrog rau qhov tsawg kawg nkaus ntawm phab ntsa pov thawj), thiab ncaj nraim kom haum haum- nce thiab txaus corrosion nyiaj.
Surface Finish Inspection: Tshwj xeeb tshaj yog rau sab hauv, qhov smoothness cuam tshuam rau corrosion kuj thiab cov kua dej ntws yam ntxwv.
5. Dab tsi yog qhov kev txiav txim siab nyiaj txiag tseem ceeb thaum qhia txog Hastelloy G-30 seamless kav piv rau lwm cov khoom siv?
Thaum Hastelloy G-30 cov kav dej seamless hais kom tus nqi hwm, lawv cov lus qhia feem ntau yog qhov tseeb los ntawm kev txheeb xyuas tus nqi ntawm lub neej:
Tus nqi pib piv rau lub neej- Tus nqi voj voog: Txawm hais tias tus nqi pib pib yog 3-5 npaug siab dua 316L stainless hlau, tag nrho cov nqi ntawm cov tswv cuab nyob rau lub sijhawm 20 xyoo yuav qis dua vim muaj kev pab cuam txuas ntxiv thiab txo kev txij nkawm.
Downtime Economics: Hauv kev lag luam txuas ntxiv, kev kaw tsis tu ncua tuaj yeem raug nqi ntau pua txhiab nyiaj hauv ib hnub. Kev ntseeg siab ntawm G-30 piping nyob rau hauv ib puag ncig nruj txo qis cov kev pheej hmoo no.
Kev nyab xeeb thiab ib puag ncig Factors: Kev xau ntawm cov tshuaj lom neeg muaj feem cuam tshuam rau cov kev cai tseem ceeb, cov nqi tu, thiab kev lav phib xaub. Cov pov thawj corrosion kuj ntawm G-30 txo cov kev pheej hmoo loj heev.
Kev tsim kho kom zoo: Cov hlau alloy lub zog thiab kev tiv thaiv corrosion tuaj yeem tso cai rau cov phab ntsa nyias dua piv rau qis dua - cov ntaub ntawv qib siab nrog kev tiv thaiv corrosion, uas tuaj yeem cuam tshuam qee cov khoom siv tus nqi sib txawv los ntawm kev txuag nyiaj.
Daim ntawv thov -Kev Txiav Txim Tshwj Xeeb: Hauv qee qhov chaw xws li kub concentrated sulfuric acid lossis cov kab mob phosphoric acid, muaj ob peb txoj hauv kev siv tau rau G-30, ua rau nws tsuas yog xaiv tsis hais txog tus nqi txiav txim siab.
Qhov kev txiav txim siab siv Hastelloy G-30 seamless kav thaum kawg sib npaug ntawm cov kev cai tiv thaiv kev lag luam, nrog rau cov hlau tsis sib xws hauv cov oxidizing acid ib puag ncig feem ntau pom zoo rau nws cov kev xaiv txawm tias cov nqi siab dua.
