1: Vim li cas Incoloy 800 yog qhov nthuav dav thiab kev lag luam zoo ("Kub Muag") kev xaiv rau cov cua sov caij rods thiab tuav hauv cov khoom siv hluav taws xob, tshwj xeeb tshaj yog thaum piv rau lwm yam xws li stainless hlau lossis Kanthal?
Incoloy 800 ua tiav nws qhov "kub muag" raws li txoj cai los ntawm kev muab qhov zoo tshaj plaws ntawm kev ua tau zoo, kev ua haujlwm ntev, thiab tus nqi nyob rau hauv qhov kub thiab txias (kwv yees li 600℃txog 1100℃/ 1112℃F txog 2012℃F), qhov twg lwm txoj kev tsis zoo.
vs. Stainless Steels (xws li, AISI 304/310): Thaum pheej yig dua pib, stainless hlau raug kev txom nyem los ntawm oxidation sai, scaling, thiab embrittlement saum toj no ~ 900℃. Lawv cov hluav taws xob qis qis feem ntau yuav tsum muaj kev sib tw ntau dua, thiab lawv muaj kev puas tsuaj loj hauv cov huab cua carburizing. Incoloy 800's superior oxidation kuj thiab cov qauv kev ruaj ntseg ntawm cov kub no ua rau lub neej ua haujlwm ntev dua, txo qis qis thiab hloov cov nqi.
vs. Hlau-Chromium-Aluminium (FeCrAl) Alloys (piv txwv li, Kanthal): FeCrAl alloys muaj qhov kub thiab txias ua haujlwm siab dua thiab zoo heev oxidation tsis kam vim lawv tiv thaiv alumina nplai. Txawm li cas los xij, qhov ntsuas no yog nkig thiab tuaj yeem tawg thaum caij tsheb kauj vab, ua rau kub kub thiab tsis ua haujlwm. Lawv kuj tsis tshua muaj ductile thiab nyuaj rau vuam los yog tsim. Incoloy 800, nrog nws cov nplai chromia hnyav dua, muaj cov thermal cycling zoo dua thiab cov ntaub ntawv zoo dua qub, ua rau nws zoo tagnrho rau kev sib tw helical lossis kev cai- tsim cov ntsiab lus hauv cyclically ua rauv taws.
vs. Higher Nickel Alloys (xws li Inconel 601/600): Cov no muaj kev ua tau zoo dua ntawm qhov kawg ntawm qhov ntsuas kub tab sis tuaj ntawm tus nqi raw khoom ntau dua. Rau feem ntau ntawm cov kev siv cua sov ua haujlwm ntawm 800℃thiab 1100 degree, Incoloy 800 muab kev ua tau zoo txaus ntawm tus nqi ntau dua, xa cov nqi zoo tshaj plaws ntawm cov tswv cuab.
Qhov "qab zib qhov chaw" ntawm qhov txaus siab - qhov kub thiab txias, zoo heev cyclic oxidation kuj, zoo fabricability, thiab tus nqi nruab nrab ncaj qha tsav nws txoj kev lag luam loj hlob.
2: Dab tsi tshwj xeeb metallurgical khoom ntawm Incoloy 800 bar Tshuag yog qhov tseem ceeb rau kev txhim khu kev qha thiab ntev - hluav taws xob cua sov ua haujlwm ntev?
Kev ua tau zoo ntawm cov khoom cua sov pas nrig yog hais los ntawm cov hluav taws xob thiab lub cev muaj zog uas tau los ntawm nws cov metallurgy:
Kev Sib Txuas Hluav Taws Xob: Incoloy 800 muaj qhov ua haujlwm siab thiab ruaj khov (kwv yees li 1.03 µΩ·m ntawm 20 degree). Kev sib xyaw ua ke (Ni-Fe- Cr tshuav nyiaj li cas) hauv cov khoom lag luam bar yog ib qho tseem ceeb los xyuas kom meej tias lub hwj chim tso tawm (wattage) rau ib lub ntsiab lus geometry (ntev, txoj kab uas hla, coil pitch).
Low Temperature Coefficient of Resistance: Lub alloy lub resistivity nce nrog kub nyob rau hauv ib tug kwv yees thiab nruab nrab yam. Qhov no tiv thaiv ntau dhau tam sim no thaum pib thiab tso cai rau kev tswj hwm lub zog ruaj khov dua piv rau cov khoom siv nrog qhov kub thiab txias coefficient.
Oxidation Resistance via Surface Oxide Scale: The key to longevity is the formation of a dense, adherent, and self-healing chromium oxide (Cr₂O₃) scale on the surface. Qhov ntsuas no ua raws li qhov thaiv, tiv thaiv oxidation ntxiv ntawm cov hlau hauv qab. Qhov tsawg kawg nkaus 20% chromium cov ntsiab lus hauv Incoloy 800 yog qhov tseem ceeb rau qhov no.
Resistance rau "Green Rot" (Carburization Embrittlement): Nyob rau hauv lub cub tawg nrog carbonaceous cua (xws li, carburizing, endothermic gas), cov pa roj carbon diffuse rau hauv nickel-chromium alloys, tsim nrog chromium carbides. Qhov no depletes chromium los ntawm matrix, rhuav tshem oxidation tsis kam thiab ua rau hnyav embrittlement ("ntsuab rot"). Incoloy 800's npib tsib xee cov ntsiab lus muab cov qib ntawm cov carburization tsis kam zoo tshaj rau ntau cov hlau tsis huv.
Siab -Temperature Creep Strength: Lub caij yuav tsum tiv thaiv sagging lossis distortion nyob rau hauv nws tus kheej qhov hnyav ntawm kev khiav hauj lwm kub. Lub zog daws teeb meem ntawm Incoloy 800 yog qhov txaus rau feem ntau cov qauv tsim, txawm hais tias ntev heev tsis txhawb nqa los yog siab dua, cov qib H / HT nrog lub zog siab dua tuaj yeem raug teev tseg.
3: Nyob rau hauv dab tsi tshwj xeeb kev lag luam cua sov daim ntaub ntawv yog Incoloy 800 pas nrig / bar qhov nyiam los yog qauv xaiv rau cov ntsiab lus, thiab qhov twg nws yuav tsum tau zam?
Cov ntawv thov nyiam (Ua haujlwm feem ntau mus txog ~ 1100 degree):
Industrial & Commercial Ovens: Forging, kho cua sov, ceramic firing, thiab hmoov txheej ncu.
Cov Cheebtsam ntawm lub cub tawg: Raws li cov raj radiant, muffles, thiab cov khoom nyob rau hauv lub thawv, qhov, thiab lub tsheb - hauv qab cub.
Cua & Clean Atmosphere Cua sov: Zoo heev rau kev siv nrog oxidizing lossis inert cua. Feem ntau siv nyob rau hauv recirculating cua rhaub thiab convection furnaces.
Tej Cuab Yeej Hluav Taws Xob Hluav Taws Xob: Ua tau zoo hauv exothermic (me ntsis txo) thiab endothermic (carburizing) cua, txawm tias lub neej txo qis piv rau oxidizing atmospheres. Nws yog qhov kev xaiv tus qauv rau ntau qhov cub carburizing qhov twg qhov sib npaug ntawm tus nqi thiab lub neej yog nrhiav.
Daim ntawv thov kom zam los yog siv nrog ceev faj:
High-Nqus tsev los yog Pure Hydrogen rauv: Cov txheej txheem tiv thaiv chromia yuav tsum muaj cov pa me me los tsim thiab kho. Nyob rau hauv siab - nqus los yog txo qis hydrogen atmospheres, qhov ntsuas no tuaj yeem txo qis, ua rau muaj kev puas tsuaj sai. Cov qib tshwj xeeb "huv" lossis lwm yam alloys tau siv ntawm no.
Ib puag ncig nrog Halogens (Chlorine, Fluorine): Cov tebchaw no tuaj yeem rhuav tshem cov nplai oxide thiab ua rau muaj kev puas tsuaj sai oxidation thiab corrosion.
Daim ntawv thov nrog Sulfur-Cov Kabmob Cov Kabmob: Thaum nws muaj qee qhov kev tiv thaiv, cov tshuaj sulfur siab (piv txwv li, hauv qee qhov cua sov- kho cua sov) tuaj yeem ua rau sulfidation nres.
Very High-Temperature Static Loads (>1100℃): Rau ntev - lub sijhawm ua haujlwm siab tshaj 1100℃nyob rau hauv load, alloys nrog cov ntsiab lus aluminium siab dua (xws li Inconel 601 lossis RA 330) lossis qib 800HT yog qhov tsim nyog dua.
4: Dab tsi yog qhov tseem ceeb ntawm kev tsim khoom thiab kev tswj xyuas kom zoo rau kev tsim cov khoom siv hluav taws xob zoo Incoloy 800 cua sov los ntawm cov khoom lag luam bar?
Hloov cov ntawv pov thawj bar Tshuag rau hauv siab -kev ua tau zoo yuav tsum muaj kev tsim khoom:
Raw Material Certification: Bar yuav tsum muaj MTR siv tau lees paub UNS N08800 chemistry thiab nyob rau hauv ib qho kev daws teeb meem tag nrho -annealed mob los xyuas kom zoo ductility rau kev tsim.
Precision Coiling / Forming: Cov pas nrig yog rhuab (feem ntau los ntawm kev ua haujlwm) thiab lub qhov txhab ntawm lub mandrel los tsim cov khoom zoo, zoo ib yam. Kev tswj lub suab, txoj kab uas hla, thiab ncab yog qhov tseem ceeb rau kev faib cov cua sov thiab tiv thaiv "qhov kub kub".
Terminal Kev Npaj & Vuam: Qhov kawg feem ntau flattened, drilled, los yog threaded. Kev sib txuas ntawm cov khoom siv hlau thiab cov hlau lead uas hnyav dua (feem ntau yog cov nickel alloy) yog qhov tseem ceeb. Muaj peev xwm vuam (TIG) siv cov khoom siv hlau sib txuam (xws li ERNiCr-3) yog qhov tseem ceeb los tsim kom muaj kev sib koom ua ke uas tsis tshua muaj zog, tsis muaj kev cuam tshuam los ntawm thermal qaug zog.
Deg Conditioning & Pre-Oxidation: Cov khoom coiled yuav raug ntxuav thiab tom qab ntawd raug tswj los ntawm kev kho cua sov "pre-} oxidation". Qhov no loj hlob thawj zaug tiv thaiv chromia nplai nyob rau hauv ib puag ncig tswj, kev txhim kho thawj zaug kev ua haujlwm thiab kev ua haujlwm ntev hauv kev pabcuam.
Kev Xeem Hluav Taws Xob Kawg: 100% kev sim ntawm kev tiv thaiv (kom paub tseeb tias tsim wattage) thiab siab - muaj peev xwm (hipot) kuaj xyuas kom paub tseeb tias lub zog dielectric ntawm cov nplai oxide thiab tsis muaj qhov txhaum hauv av yog qhov yuav tsum tau kuaj zaum kawg.
5: Rau cov kws kho tsheb lossis cov neeg ua haujlwm hauv lub tshuab hluav taws xob, qhov kev coj ua zoo tshaj plaws rau kev txhim kho thiab tswj Incoloy 800 cua sov cov ntsiab lus yog dab tsi?
Kev tuav thiab kev ua haujlwm kom zoo yog qhov tseem ceeb raws li kev xaiv cov khoom:
Ua tib zoo Installation: Tsis txhob kinking, khawb, los yog notching lub ntsiab pas nrig. Txhawb cov ntsiab lus kom zoo los tiv thaiv sagging thiab xyuas kom lawv tsis muaj kev sib cuag nrog lub tshuab hluav taws xob refractories lossis fixtures. Siv tau tshaj, siab -kub insulators (xws li, ceramic).
Controlled Start-Up ("Seasoning"): Rau cov ntsiab lus tshiab, ua raws li kev tswj hwm kev nce qib- nce qib. Qhov no tso cai rau cov txheej txheem oxide tiv thaiv kom tag nrho tsim thiab ruaj khov, tshwj xeeb tshaj yog qhov tseem ceeb tom qab kev teeb tsa qhov twg cov roj los ntawm kev tuav yuav tshwm sim.
Tsis txhob kis kab mob: Tiv thaiv kev sib cuag nrog cov ntsev, cov hlau uas muaj cov ntsiab lus melting tsawg (xws li zinc, aluminium), los yog corrosive fluxes. Cov no tuaj yeem cuam tshuam cov oxide nplai hauv zos.
Ua Haujlwm Hauv Cov Kev Cai Tsim: Tsis txhob tshaj qhov pom zoo saum npoo av (watt ntom) rau cov qauv tsim. Overloading ua rau kub hauv zos ntau dhau, ua kom oxidation thiab nkag mus.
Atmosphere Control: Hauv cov cua sov cua sov, xyuas kom cov huab cua sib npaug. Tsis txhob qhia cov dej noo los yog cov kab mob. Hauv qhov cub carburizing, ib ntus "hlawv- tawm" lub voj voog hauv huab cua tuaj yeem pab tshem tawm cov pa roj carbon monoxide thiab txuas ntxiv lub neej.
Kev tshuaj xyuas tsis tu ncua: Teem sijhawm kuaj pom qhov kub ntawm qhov kub, tsis sib xws sagging, thinning ntawm seem, lossis hnyav, flaky scale buildup. Cov no yog cov cim qhia tias yuav ua tsis tiav. Kev hloov pauv raws li qhov xwm txheej yog tus nqi ntau dua - ua haujlwm tau zoo dua li lub sijhawm tsis tau npaj rau qhov cub.
