1: Hastelloy UNS N06030 Alloy yog dab tsi, thiab yog vim li cas nws yog ib qho kev xaiv zoo tshaj rau welded yeeb nkab nyob rau hauv complex tshuaj ib puag ncig?
Hastelloy UNS N06030 (feem ntau hu ua Alloy G30) yog npib tsib xee -chromium- hlau- molybdenum superalloy nrog cov tseem ceeb ntxiv ntawm cobalt thiab tungsten, thiab ruaj khov nrog niobium. Nws cov nominal muaj pes tsawg leeg yog kwv yees li 43% Ni, 30% Cr, 15% Fe, 5.5% Mo, 5% W, 2.5% Co, thiab 1% Nb. Qhov no sophisticated chemistry yog engineered los muab tshwj xeeb, broad -spectrum corrosion kuj, ua rau nws ib tug premier khoom rau welded yeeb nkab nyob rau hauv kev lag luam tuav complex, tov kua qaub.
Tsis zoo li alloys optimized rau ntshiab txo (xws li, Hastelloy B) los yog oxidizing (xws li, ntshiab chromium steels) ib puag ncig, N06030 muaj ib tug sib npaug, dual -theem tsis kam. Nws cov ntsiab lus chromium siab muab kev tiv thaiv zoo tiv thaiv oxidizing corrosives zoo li nitric acid, kub sulfuric acid nrog yaj oxygen, thiab oxidizing ntsev. Nyob rau tib lub sijhawm, nws cov ntsiab lus molybdenum thiab tungsten tseem ceeb ua rau muaj kev tiv thaiv zoo los txo cov acids xws li hydrochloric thiab phosphoric acids, nrog rau pitting thiab crevice corrosion hauv chloride - nplua nuj cov ntsiab lus. Qhov sib ntxiv niobium txhim khu kev ruaj ntseg tiv thaiv kev nkag siab thaum vuam.
Yog li ntawd, Hastelloy N06030 welded yeeb nkab yog qhov kev xaiv zoo tshaj plaws rau cov nroj tsuag ua cov tshuaj sib tov sib xyaw, xws li hauv phosphoric acid ntau lawm (nrog fluoride thiab chloride impurities), sulfuric acid pickling kab (nrog ntau qhov sib txawv thiab oxidizing muaj peev xwm), thiab khib nyiab acid rov qab tshuab qhov twg cov kwj muaj pes tsawg leeg yog unpredictable los yog hnyav heev.
2: Dab tsi yog qhov tseem ceeb rau kev vuam Hastelloy N06030 yeeb nkab kom khaws nws cov kev tiv thaiv corrosion?
Vuam Hastelloy N06030 yeeb nkab ua tau zoo hinges ntawm cov txheej txheem tsim los tswj nws qhov tseeb metallurgical tshuav nyiaj li cas thiab tiv thaiv kev tsim cov theem tsis zoo nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ). Cov teeb meem tseem ceeb thiab kev txo qis yog:
Sensitization thiab Weld Decay: Thaum lub niobium stabilization zoo heev txo qhov kev pheej hmoo, kev vuam tsis zoo tseem tuaj yeem ua rau chromium -carbide nag lossis daus hauv HAZ, depleting chromium thiab tsim txoj hauv kev rau intergranular corrosion.
Kev txo qis: Siv cov txheej txheem vuam qis qis xws li Gas Tungsten Arc Vuam (GTAW/TIG) rau cov hauv paus hniav thiab kub dhau. Kev tswj qhov kub thiab txias (feem ntau yog qis dua 150℃/ 300℃F) yog qhov yuav tsum tau ua kom txo tau lub sijhawm ntawm cov nag lossis daus ntawm carbide.
Secondary Phase Precipitation: Ntev raug rau qhov kub thiab txias ntawm kwv yees li 550℃thiab 1050℃(1020℃F - 1920℃F) tuaj yeem ua rau kev tsim cov theem intermetallic (xws li sigma, mu) lossis lwm yam carbides, uas tuaj yeem ua rau thaj tsam weld thiab txo cov corrosion kuj.
Kev txo qis: Siv cov vuam nrawm nrawm thiab, qhov twg ua tau, ib qho kev tshaj tawm -weld tov anneal (piv txwv li, 1175℃/ 2150℃F ua raws li ceev ceev quenching) kom yaj cov dej nag puas tsuaj. Rau thaj chaw welds qhov twg tag nrho annealing yog tsis yooj yim sua, nruj adherence rau tsawg tshav kub input yog tsuas tiv thaiv.
Filler Metal Selection: Sib phim cov khoom siv hlau yog qhov tseem ceeb. ERNiCrMo-11 (tseem hu ua FM G30) yog tus qauv xaiv. Nws yog me ntsis zuag qhia tag nrho hauv cov ntsiab lus tseem ceeb xws li chromium thiab molybdenum los them rau qhov muaj peev xwm sib cais thaum lub sij hawm khov kho, kom ntseeg tau tias cov hlau vuam hlau tsis sib haum los yog ntau tshaj ntawm cov yeeb nkab hauv paus.
Shielding thiab Purging: Txhawm rau tiv thaiv oxidation thiab "sugaring" (tsim ntawm brittle, oxidized weld hlaws), 100% inert gas shielding (argon) yuav tsum tau rau ob lub ntsej muag weld thiab, tseem ceeb, lub hauv paus ntawm lub weld. Cov roj rov qab zoo huv si tsis yog - sib tham tau kom ua tiav lub suab, corrosion- tiv thaiv hauv paus hla.
3: Cov txheej txheem tshwj xeeb twg yog Hastelloy N06030 Welded Yeeb Nkab feem ntau siv?
Qhov kev ua tau zoo ntawm cov hlau no ua rau nws ua haujlwm hauv ntau qhov kev xav tau uas cov kav dej fim ntau - kua qaub los yog cov kab mob paug:
Phosphoric Acid Production (Cov Txheej Txheem ntub dej): Qhov no yog daim ntawv thov tseem ceeb. Cov txheej txheem suav nrog sulfuric acid reacting nrog phosphate pob zeb, tsim phosphoric acid kis nrog sulfuric acid, fluoride ions, chloride ions, thiab cov khoom silicates. N06030 welded yeeb nkab ua tau zoo hauv kev tuav cov slurry zoo kawg nkaus ntawm qhov kub siab hauv cov evaporators, concentrators, thiab cov kab hloov, ua tau zoo tshaj lwm yam stainless hlau thiab npib tsib xee alloys.
Sulfuric Acid Pickling thiab Regeneration Plants: Hauv kev ua cov hlau thiab titanium, cov da dej pickling siv kub sulfuric acid, uas yuav kis tau nrog hlau thiab lwm yam hlau ions. N06030 yeeb nkab tuav ob qho tib si cov kua qaub tshiab thiab cov kab mob sib kis, feem ntau oxidizing, siv cov kua qaub hauv cov txheej txheem rov qab.
Mixed Acid (Nitric{0}}Hydrofluoric) Kev Pabcuam: Txawm tias tsis yog rau HF cov ntsiab lus siab, nws yog qhov tsim nyog rau qee qhov sib xyaw acid ib puag ncig siv hauv cov hlau ntxuav thiab etching, qhov twg cov qauv stainless hlau zoo li 316L yuav ua tsis tau sai.
Kev ua tshuaj lom neeg thiab tshuaj: Rau cov reactors thiab kav dej tuav ntau -theem synthesis uas muaj ob qho tib si oxidizing thiab txo cov kauj ruam, los yog qhov twg chlorides tam sim no impurities los yog catalysts (xws li, nyob rau hauv tej yam chlorination los yog polymerization txheej txheem). Nws kuj tseem siv rau hauv cov tshuab flue gas desulfurization (FGD) hauv cov chaw tseem ceeb.
Khib nyiab Incineration thiab Acid Recovery: Rau piping uas conveys complex, kub, thiab feem ntau sib txawv acidic effluents los ntawm pov tseg kev kho mob los yog tshuaj rov qab units.
Hauv cov txheej txheem no, tus nqi -kev ua tau zoo ntawm cov yeeb nkab welded (vim seamless) rau cov kab loj - txoj kab uas hla yog qhov tseem ceeb, muab cov txheej txheem vuam tau ua raws li nruj heev.
4: Qhov kev ua tau zoo thiab tus nqi ntawm Hastelloy N06030 Welded Pipe piv rau "workhorse" alloys zoo li 316L thiab cov alloyed zoo li C-276 li cas?
Hastelloy N06030 nyob hauv nruab nrab - hauv av hauv kev xaiv cov khoom siv, muab qhov sib npaug ntawm kev ua tau zoo thiab tus nqi.
vs Austenitic Stainless hlau 316L:
Kev ua tau zoo: N06030 yog qhov zoo tshaj plaws . 316L muaj kev txwv tsis pub txawm tias dilute hydrochloric acid, tsis zoo tiv thaiv sulfuric acid siab tshaj qhov nruab nrab, thiab muaj kev cuam tshuam rau chloride-induced pitting thiab stress corrosion cracking (SCC). N06030 ua haujlwm rau cov cheeb tsam no yooj yim. Nws tsis yog ib qho kev hloov kho me ntsis tab sis yog ib kauj ruam tseem ceeb - hloov pauv rau cov xwm txheej hnyav dua.
Tus nqi: N06030 tseem kim dua ib kilogram dua 316L. Txawm li cas los xij, nws lub neej kev pab cuam ntev dua thiab txo qis qis hauv qhov chaw nruj heev feem ntau ua rau tus nqi qis dua ntawm cov tswv cuab, ua pov thawj qhov pib siv peev.
vs Hastelloy C-276 (UNS N10276):
Kev ua tau zoo: C-276 muaj kev tiv thaiv dav dav, tshwj xeeb tshaj yog ua tau zoo hauv qhov chaw oxidizing chloride hnyav tshaj plaws (xws li, kub ntub dej chlorine, hypochlorite) thiab muab me ntsis zoo dua los txo cov kua qaub. Txawm li cas los xij, N06030 muaj qhov txiaj ntsig tseem ceeb hauv phosphoric acid thiab qee yam oxidizing sulfuric acid zoo heev, qhov twg nws cov ntsiab lus chromium ntau dua tau txais txiaj ntsig. Rau ntau cov kua qaub sib xyaw, lawv cov kev ua tau zoo sib piv.
Nqi & Fabrication: N06030 feem ntau yog tus nqi ntau dua -zoo dua C-276. Nws kuj feem ntau pom zoo weldability nrog tsawg dua kev pheej hmoo ntawm theem thib ob tsim nyob rau hauv HAZ, ua fabrication ntawm welded yeeb nkab tshuab me ntsis tseem ceeb thiab muaj peev xwm zam txim ntau dua.
Cov ntsiab lus: N06030 welded yeeb nkab tau teev tseg thaum 316L tsis txaus tab sis tag nrho (thiab kim dua) muaj peev xwm ntawm C-276 tsis tas yuav tsum muaj. Nws yog qhov kev ua tau zoo tshaj plaws -kev daws teeb meem kev lag luam rau lub qhov dej zoo-txhais txheej ntawm complex, multi-acid ib puag ncig.
5: Dab tsi yog qhov tseem ceeb ntawm kev tshuaj xyuas, kev sim, thiab kev tswj cov txheej txheem kom ntseeg tau qhov zoo ntawm Hastelloy N06030 Welded Pipe systems?
Muab nws daim ntawv thov hauv kev pabcuam corrosive tseem ceeb, kev ruaj ntseg zoo rau N06030 welded piping systems yog nruj.
1. Khoom thiab Fabrication Verification:
Kev txheeb xyuas cov khoom zoo (PMI): Siv cov khoom siv tes tuav XRF ntawm ob lub yeeb nkab thiab cov hlau muab tub lim kom paub tseeb tias kev ua raws li N06030 thiab ERNiCrMo-11 cov lus qhia tshwj xeeb, tiv thaiv cov khoom siv kim heev.
Weld Procedure Qualification (WPQ): Txhua qhov vuam yuav tsum ua raws li tus txheej txheem tsim nyog (WPS) ua pov thawj los ntawm cov txheej txheem tsim nyog cov ntaub ntawv (PQR), suav nrog kev kuaj corrosion ntawm vuam daim coupon yog tias tau teev tseg.
2. Tsis yog-Kev kuaj xyuas kev puas tsuaj (NDE):
Kev soj ntsuam pom (VT): 100% ntawm tag nrho cov welds.
Dye Penetrant Testing (PT): Rau kev kuaj xyuas qhov chaw- rhuav tshem qhov tsis xws luag ntawm lub hau thiab cov hauv paus hniav (tom qab rov qab-gouging).
Radiographic Testing (RT): Tus qauv rau kev kuaj ntsuas ntawm lub pob tw welds los qhia txog qhov tsis xws luag xws li porosity, tsis muaj fusion, lossis tawg. Automated Ultrasonic Testing (AUT) tuaj yeem siv los ua lwm txoj hauv kev los yog ntxiv.
Kev Ntsuas Ferrite: Thaum austenitic, qee qhov kev kuaj xyuas yuav raug teev kom ntseeg tau tias tsis muaj kev cuam tshuam cov qib sib nqus.
3. Tshaj tawm -Kev kho vuam thiab kuaj zaum kawg:
Pickling & Passivation: Tom qab vuam thiab kev kho cua sov, tag nrho sab hauv vuam cheeb tsam thiab HAZ yuav tsum tau pickled nrog HNO3 / HF sib tov kom tshem tawm oxidation nplai thiab rov ua dua cov txheej chromium oxide passive, tom qab ntawd passivation hauv nitric acid. Rau welded yeeb nkab, qhov no yog feem ntau ua rau ntawm lub spool ua ntej installation.
Kev Ntsuas Hydrostatic: Lub kaw lus ua tiav yog kuaj nrog huv, chloride- dej dawb los xyuas qhov tseeb siab. Kev ziab sai sai thiab tag nrho tom qab kev sim yog qhov tseem ceeb los tiv thaiv chloride pitting.
Kev huv huv: Ua ntej ua haujlwm, cov yeeb nkab yuav tsum tau muab ntxuav kom huv si kom tshem tawm tag nrho cov khoom siv khib nyiab, vuam slag, thiab hlau paug ntawm cov cuab yeej. Cov kaus mom yas yuav tsum khaws cia rau ntawm qhov chaw qhib kom tsis txhob muaj kab mob.
4. Cov ntaub ntawv: Cov ntaub ntawv ua tiav suav nrog Daim Ntawv Pov Thawj Mill Test rau cov yeeb nkab / cov khoom ntim, WPS / PQR, NDE cov ntaub ntawv, PMI cov ntaub ntawv, thiab cov ntawv pov thawj kev ntsuas siab yog qhov tseem ceeb rau kev taug qab zoo thiab kev nyab xeeb ntawm kev ua haujlwm.
