1. Dab tsi tshwj xeeb metallurgical yam ntxwv muab cov chav kawm ntawm alloys nws "zoo heev txias-nias khoom"?
Qhov txias txias zoo heev - nias cov cuab yeej yog qhov tshwm sim ncaj qha ntawm nws cov austenitic (lub ntsej muag -centered cubic, FCC) crystal qauv thiab ua tib zoo tswj cov khoom xyaw.
FCC Structure: Lub austenitic matrix muab ntau lub tshuab plam, tso cai rau cov hlau mus rau cov yas deformation ntau yam tsis muaj pob txha tawg. Lub hauv paus ductility no yog lub hauv paus rau kev txias - nias cov haujlwm xws li kos duab sib sib zog nqus, khoov, thiab stamping.
Nickel Cov ntsiab lus (~ 30-42%): Nickel yog lub zog austenite stabilizer. Nws ua kom cov qauv FCC khaws cia los ntawm qhov kub thiab txias mus txog qhov melting point, tiv thaiv kev hloov pauv mus rau theem nkig thaum lub sij hawm deformation.
Tswj Carbon & Stabilizing Elements: Cov ntsiab lus carbon yog khaws cia qis, thiab cov ntsiab lus zoo li Titanium (hauv Incoloy 800) ntxiv los tiv thaiv kev tsim cov chromium carbides thaum ua. Cov carbides tuaj yeem pin cov ciam teb thiab txo cov ductility, yog li lawv cov tsub zuj zuj yog qhov tseem ceeb rau kev tswj cov formability.
Annealed Condition: Cov hlau no tau muab tso rau hauv kev daws teeb meem -annealed xeev. Qhov kev kho cua sov no ua rau cov txheej txheem precipitated thiab ua rau cov mos mos, homogeneous, thiab ductile microstructure, uas yog qhov zoo tagnrho rau kev ua kom txias -.
2. Rau ib qho kev tivthaiv uas yuav tsum tau ua kom txias txias- ua thiab tiv thaiv oxidizing cua ntawm qhov kub thiab txias, qhov tshwj xeeb alloy bar yuav zoo dua?
Incoloy 800H (UNS N08810) yog qhov kev xaiv zoo tshaj plaws rau qhov kev xav tau ua ke no.
Txias-Kev sib sau: Nws muaj cov ductility zoo heev thiab cov qauv austenitic uas tau piav qhia saum toj no, tso cai rau kev ua haujlwm nyuaj thiab ua haujlwm hauv qhov mob annealed.
Siab - Kub Oxidation Resistance: Nws cov ntsiab lus chromium siab (~19-23%) ua kom ruaj khov, tiv thaiv chromium oxide (Cr₂O₃) nplai, muab kev tiv thaiv zoo tshaj plaws rau scaling thiab oxidation hauv huab cua thiab lwm yam oxidizing cua ntawm qhov kub txog li ~ 1175℃(2150℃F).
Qhov zoo ntawm "H": Qib "H" muaj cov ntsiab lus ntawm cov pa roj carbon monoxide (0.05-}0.10%) thiab cov nplej ntxhib, uas tau tsim tshwj xeeb los ua kom muaj zog nkag tau zoo tshaj - ua haujlwm kom qeeb deformation hauv kev ntxhov siab ntawm qhov kub thiab txias. Qhov no ua rau nws haum rau cov khoom siv thauj khoom hauv cov khoom siv hluav taws xob thiab cov khoom siv kho cua sov.
Ib qho bar ntawm Incoloy 800H tuaj yeem ua rau txias- nias rau hauv qhov chaw sib tw (xws li, lub raj xaim hluav taws xob) thiab tom qab ntawd yuav tuav nws lub zog thiab tiv thaiv oxidation rau xyoo nyob rau hauv siab - qhov kub thiab txias.
3. Qhov kev ua tau zoo ntawm npib tsib xee - hlau- chromium alloy bar zoo li Incoloy 825 txawv li cas ntawm tus qauv 304 stainless hlau bar nyob rau hauv ib puag ncig corrosive?
Qhov sib txawv ntawm kev ua tau zoo yog qhov ua tau zoo hauv ntau qhov chaw tshuaj lom neeg, tshwj xeeb yog cov uas muaj cov kua qaub thiab chlorides.
304 Stainless Hlau: Cia siab rau cov yeeb yaj kiab chromium oxide, uas tsis ruaj khov hauv kev txo cov kua qaub (xws li sulfuric, phosphoric) thiab raug rau chloride stress corrosion cracking (SCC).
Incoloy 825 (UNS N08825): Nws cov chemistry txhim kho muaj kev tiv thaiv zoo:
Nickel (~ 40%): Muab kev tiv thaiv kab mob hauv lub cev rau chloride SCC.
Molybdenum (~ 2.5-3.5%): Resistant pitting thiab crevice corrosion nyob rau hauv cov tshuaj chloride thiab tiv thaiv kom txhob muaj acids.
Copper (~ 1.5-3.0%): Tshwj xeeb ntxiv los txhim khu kev tiv thaiv rau sulfuric acid.
Cov ntsiab lus: Thaum 304 stainless yog qhov tsim nyog rau cov huab cua me me thiab dej tshiab, Incoloy 825 bar tau teev tseg rau kev ua tshuaj lom neeg, cov kab pickling, thiab cov ntawv thov offshore qhov twg 304 yuav poob sai.
4. Dab tsi yog qhov tseem ceeb tshaj tawm - tsim cov kev kho cua sov rau qhov txias - cov khoom sib txuas ua los ntawm cov hlau alloy no?
Tom qab txias txias heev- nias, kev kho cua sov feem ntau yuav tsum tau ua kom cov khoom siv tiv thaiv corrosion thiab txo kev ntxhov siab.
Kev daws Annealing:
Lub hom phiaj: Txhawm rau yaj cov chromium carbides uas tej zaum yuav muaj nag lossis daus ntawm cov ciam teb thaum lub sij hawm "sov" ntu ntawm kev tsim, thiab rov ua kom rov ua haujlwm dua -txheej microstructure, rov ua kom tag nrho cov ductility thiab corrosion kuj.
Txheej txheem: Cov khoom siv yog rhuab mus rau qhov kub siab (piv txwv li, 980-1150℃/ 1800-2100℃F rau Incoloy 800/825), tuav kom ua tiav cov qauv sib xws, thiab tom qab ntawd txias txias (quenched) los tiv thaiv carbide rov los nag.
Stress Relieving:
Lub hom phiaj: Yog tias cov khoom siv yuav raug siv rau hauv qhov chaw pabcuam uas muaj kev cuam tshuam rau kev ntxhov siab corrosion tawg (xws li, muaj cov tshuaj chlorides), qis dua - qhov kub thiab txias kev ntxhov siab yog ua kom txo tau qhov kev ntxhov siab ntau dhau los ntawm kev tsim yam tsis muaj kev hloov pauv microstructure.
Cov txheej txheem: Cua sov kom sov rau hauv qab ntawm carbide nag lossis daus ntau (piv txwv li, 425-540℃/ 800-1000℃F) thiab ua kom txias qeeb.
Cov kev kho mob tshwj xeeb yog nyob ntawm cov hlau alloy thiab qhov kev pab cuam ib puag ncig.
5. Nyob rau hauv kev tsom xam tus nqi lifecycle, xaiv ib lub bar ntawm no alloy rau lub qhov cub fixture ua pov thawj nws cov nqi tshaj ib tug pheej yig dua cam khwb cia lwm?
Qhov kev ncaj ncees yog raws li Tus Nqi Tag Nrho Cov Tswv Cuab (TCO), qhov twg ua tau zoo dua thiab kev ua haujlwm ntev heev txo cov nqi ua haujlwm.
Lub Downside ntawm Cast Alternatives (piv txwv li, HK lossis HP-series cam khwb cia hlau):
Tus nqi qis dua: Cov khoom siv pov tseg yog pib pheej yig dua.
Lub neej ua haujlwm luv dua: Lawv feem ntau ua rau oxidation, carburization, thiab creep deformation, ua rau tsis tu ncua, tsis npaj hloov pauv.
Tus nqi ntawm Lub Sij Hawm: Ib lub qhov cub hluav taws xob kaw ib zaug los hloov cov khoom siv tsis raug nqi kaum tawm txhiab tus hauv kev poob thiab kev ua haujlwm, yooj yim eclipsing tus nqi sib txawv rau wrought alloy bar.
Tus nqi Proposition ntawm Wrought Alloy Bar (piv txwv li, Incoloy 800H):
Extended Service Life: Ib qho khoom siv ua los ntawm wrought bar tuaj yeem kav ntev li 5-10 xyoo, thaum lwm qhov cam khwb cia yuav kav ntev li 1-2 xyoos hauv kev pabcuam hnyav.
Maximized Production Uptime: Kev ntseeg tau ua kom lub qhov cub ua haujlwm tsis tu ncua los ntawm kev npaj mus.
Kev ruaj ntseg Dimensional Stability: Resistance rau creep thiab sagging kom tiav cov khoom raug tuav kom raug, guaranteeing zoo.
Superior Integrity: Wrought tuav muaj qhov zoo dua, cov qauv zoo dua qub dua li cov castings, muab cov ductility zoo dua thiab cuam tshuam.
Cov ntsiab lus: Kev nqis peev siab pib hauv wrought nickel- hlau-chromium alloy bar yog "txoj cai pov hwm" tiv thaiv kev puas tsuaj rau lub sijhawm poob qis, muab TCO qis dua.
