Stellite 6 yog cov alloy feem ntau engineers ncav cuag thawj zaug thaum a cobalt raws alloy qhov xav tau hnav tiv thaiv. Nws yog cov ntaub ntawv zoo, dav muaj, thiab ua tau zoo nyob thoob plaws ntau yam ntawm abrasive thiab adhesive coj scenarios. Tab sis "default" tsis zoo ib yam li "zoo." Thaum ib feem ua tsis tau los ntawm kev puas tsuaj tab sis los ntawm thermal cycling, hlau-rau-hlau galling, los yog corrosion-pab hnav, xov xwm 21 part tej zaum yuav yog qhov kev xaiv tiv thaiv ntau dua. Qhov kev sib piv no yog sau rau cov kws tsim qauv tsim thiab cov neeg yuav khoom hnav uas yuav tsum nkag siab vim li cas ob lub alloys sib txawv, qhov twg txhua belongs, thiab dab tsi kom paub meej ua ntej cog lus rau ib qho kev qhia tshwj xeeb.
Vim li cas Stellite 6 Yog Qhov Default—thiab Thaum Stellite 21 Yog Qhov Kev Xaiv Zoo dua
Stellite 6 khwv tau nws qhov xwm txheej los ntawm kev sib xyaw ntawm cov ntsiab lus siab carbon thiab tungsten-raws li kev daws teeb meem ntxiv dag zog. Qhov tshwm sim yog ib qho nyuaj, hnav-tiv taus alloy uas ua haujlwm abrasive hais, yaig, thiab kev siv tshuab degradation thoob plaws qhov kub thiab txias. Nws txoj kev tsim khoom thiab kev ua haujlwm nyuaj yog qhov paub tab, thiab cov neeg siv khoom paub zoo yog siab. Rau ntau lub rooj zaum valve, lub tes tsho twj tso kua mis, thiab cov khoom siv dav dav, Stellite 6 yog qhov pib tsim nyog.
Lub teeb liab los xav txog Stellite 21 tshwm sim thaum qhov tseem ceeb tsis ua haujlwm hloov pauv. Yog hais tias ib feem yog tawg nyob rau hauv rov qab thermal cycles, yog hais tias sealing nto yog seizing thaum lub sij hawm hlau-rau-hlau zawv zawg, los yog yog hais tias qhov kev pab cuam ib puag ncig ua ke nrog ib tug corrosive nruab nrab, lub hardness ntau dua ntawm Stellite 6 yuav tsis daws qhov teeb meem tiag tiag. Stellite 21 ua lag luam chav-kub hardness rau toughness, thermal qaug zog tsis kam, thiab txhim kho corrosion cwj pwm nyob rau hauv tej yam xov xwm. Cov lus nug tsis yog qhov twg alloy yog "zoo dua," tab sis cov alloy twg zoo li cas qhov yuav poob.
Yuav ua li cas Composition Differences Drive Performance
Qhov kev ua tau zoo sib txawv ntawm ob lub cobalt alloys los mus rau ob qho kev xaiv sib xyaw ua ke.
Cov ntsiab lus Carbon sib txawv: Hardness vs Ductility
Stellite 6 yog kwv yees li 0.9-1.4% carbon, thaum Stellite 21 tuav kwv yees li 0.20-0.35%. Qhov sib txawv ntawd tswj ntau npaum li cas cov ntaub ntawv nyuaj carbide hauv microstructure. Cov pa roj carbon ntau dua hauv Stellite 6 txhais tau hais tias muaj ntau dua ntawm chromium-nplua nuj carbides, uas ncaj qha txhais mus rau siab dua hardness thiab zoo dua tiv thaiv abrasive hnav. Tsawg carbon nyob rau hauv Stellite 21 tawm ntau ntawm cobalt solid-solution matrix nthuav tawm, uas txo cov hardness tab sis khaws cia ductility thiab muaj peev xwm ua kom haum thermal strain yam tsis muaj cracking.
Hardness qhov tseem ceeb tshaj tawm rau Stellite 21 feem ntau poob rau hauv thaj tsam ntawm 27-40 HRC, nrog cov txiaj ntsig siab dua tuaj yeem ua tiav los ntawm kev ua haujlwm hardening (txog li 48 HRC). Stellite 6, los ntawm kev sib piv, feem ntau hais txog ntawm 40-45 HRC nyob rau hauv qhov kev tso nyiaj. Cov nuj nqis no yog qhov qhia tau tias tsis yog qhov tseeb: ib qho cam los yog wrought Stellite 21 feem yuav muaj cov khoom sib txawv dua li qhov sib txuas, thiab tus neeg muag khoom cov ntaub ntawv xeem tiag tiag yuav tsum tswj hwm qhov tshwj xeeb.
Tungsten vs Molybdenum: Cov Txheej Txheem Txhim Kho Kev Txhim Kho Logic
Stellite 6 siv tungsten rau kev daws teeb meem, thaum Stellite 21 hloov molybdenum. Kev sib pauv tsis yog ib qho yooj yim ib-rau-ib hloov. Molybdenum muaj kwv yees li ib nrab ntawm atomic qhov hnyav ntawm tungsten, yog li ntawm tib qhov hnyav feem pua nws ua rau kwv yees li ob zaug ntau ntawm atoms rau matrix. Qhov sib txawv atomic-theem no cuam tshuam li cas cov alloy coj ntawm qhov kub siab.
Tseem ceeb dua rau kev ua haujlwm corrosion, molybdenum feem ntau lees paub tias muaj txiaj ntsig zoo hauv kev txo qis ib puag ncig. Ib txoj kev tshawb nrhiav laser-cladding piv rau ob lub alloys pom tias Stellite 21 txheej tau pom zoo corrosion kuj zoo dua li Stellite 6 txheej nyob rau hauv qhov kev sim ua haujlwm. Qhov sib ntxiv ntawm molybdenum kuj tseem txo cov kev nyiam rau cov nag lossis daus ntawm qhov kub siab, uas txhawb nqa cov alloy thermal stability hauv kev pabcuam cyclic. Cov no yog cov txiaj ntsig zoo, tab sis lawv xaiv: Stellite 21 tsis yog universally ntau corrosion-resistant tshaj Stellite 6, thiab cov tshwj xeeb nruab nrab, kub, thiab aeration xeev yuav tsum tau soj ntsuam. Hauv cavitation yaig, piv txwv li, Stellite 6 tau tshaj tawm kom ua tau zoo dua Stellite 21 hauv kev sib piv cov kev tshawb fawb.
Kev sib piv kev ua haujlwm: Hardness, Toughness, Thermal Fatigue, thiab Galling
Cov lus hauv qab no qhia txog qhov sib txawv ntawm kev ua tau zoo. Cov nqi yog cov ntsiab lus qhia siv, tsis tau lees paub qhov tshwj xeeb. Kev lees txais zaum kawg yuav tsum yog raws li tus neeg muag khoom ntsuas cov ntaub ntawv rau cov khoom tshwj xeeb thiab kev tsim khoom.
| Performance Dimension | Stellite 6 | Stellite 21 | Cov ntaub ntawv ceeb toom |
| Hom hardness (raws li tso nyiaj) | 40-45 HRC | 27-40 HRC (ua haujlwm nyuaj rau ~ 48 HRC) | Weld deposit reference; cast/wrought values txawv |
| Abrasive hnav tsis kam | Siab (ntau carbides) | Tsawg (limited hard-particle yaig kuj) | Stellite 21 tsis pom zoo rau qhov hnyav hnyav-particle puas |
| Toughness / ductility | qis | Siab dua | Qhov tshwm sim ntawm qis carbide ntim |
| Thermal qaug zog kuj | Nruab nrab | Zoo dua | Cov pa roj carbon qis + Mo txo qis kev nyiam tawg hauv qab kev caij tsheb kauj vab |
| Galling kuj | Zoo | Feem ntau nyiam rau hlau-rau-hlau zawv zawg | Kev xaiv nyob ntawm mating nto thiab load |
| Corrosion kuj (aqueous) | Lub hauv paus | Zoo dua hauv qee qhov kev txo qis / nyuaj tshaj tawm | Laser-clad txoj kev tshawb fawb pom Stellite 21 ntau corrosion resistant nyob rau hauv cov kev xeem |
Ib qho kev kawm ntawm laser-clad txheej pom tias Stellite 6 yog ib qho nyuaj me ntsis nyob ze rau saum npoo, thaum Stellite 21 tau pom tias muaj kev cuam tshuam ntau dua zawv zawg hnav tsis kam vim qhov qis coefficient ntawm kev sib txhuam - qhov nthuav tawm qhov cuam tshuam rau qhov kev xav tias hardness siab dua ib txwm txhais tau tias kev hnav zoo dua. Lub takeaway yog tias hnav mechanism tseem ceeb tshaj li ib tus lej hardness.
Daim Ntawv Qhia Daim Ntawv Qhia: Sib piv cov Alloy rau hom tsis ua haujlwm
Qhov twg Stellite 6 Fits: Valve Rooj, Twj Tes Tsho, Abrasive Hnav
Stellite 6 yog qhov kev xaiv tsim nyog thaum lub hom phiaj tseem ceeb ntawm qhov degradation yog abrasive lossis erosive hnav los ntawm cov khoom tawv, slurry, lossis cov kua dej siab. Lub rooj vag valve lub rooj zaum thiab cov npoo, lub ntiaj teb valve discs, check valve flappers, thiab twj tso kua mis raug rau cov xov xwm abrasive yog tsim daim ntawv thov. Cov ntsiab lus siab carbide muab lub zog tiv thaiv kev tshem tawm cov khoom siv.
Stellite 6 kuj yog qhov kev nyab xeeb dua qub thaum txoj kev tsim khoom siv vuam lossis hardfacing rau ntawm cov hlau substrate thiab tus neeg muag khoom muaj kev paub dhau los nrog cov txheej txheem. Cov yam ntxwv ntawm cov hlau alloy yog cov yam ntxwv zoo, thiab cov txheej txheem kev tswj cov txheej txheem dilution tau dav nkag siab.
Ib qho kev ceeb toom: yog tias qhov kev pabcuam abrasive kuj suav nrog qhov nruab nrab corrosive, Stellite 6 yuav tsis yog qib zoo. Hauv qhov sib xyaw ua ke-corrosion scenario, Stellite 21 tau pom tias muaj kev ua tau zoo dua hauv kev soj ntsuam hauv chav kuaj.
Qhov twg Stellite 21 Fits: Thermal Cycling, Thin Sections, Gas Turbine Cheebtsam
Stellite 21 qhov zoo tau tshwm sim hauv peb qhov xwm txheej. Ua ntej, thermal cycling: qis carbon cov ntsiab lus thiab molybdenum ntxiv txo qhov kev tsav tsheb kom tawg hauv qab cua sov thiab cua txias dua. Stellite 21 tau siv rau hauv cov ntawv thov kub ua haujlwm thiab ua cov txheej txheem tsis sib xws uas thermal expansion mismatch ntawm steel substrate thiab hardfacing yuav tsum tau tswj. Thib ob, nyias-walled los yog geometrically complex qhov chaw tau txais txiaj ntsig los ntawm qhov nyuaj dua, uas txo qhov kev pheej hmoo ntawm kev tawg thaum ua haujlwm lossis kev pabcuam. Thib peb, cov hlau-rau-hlau zawv zawg cov ntsaws ruaj ruaj thiab cov kab sib txuas sib txuas tuaj yeem ua tau zoo dua nrog Stellite 21, tab sis qhov no yog nyob ntawm cov ntaub ntawv tshwj xeeb mating thiab kev sib cuag.
Ib txoj kev tshawb fawb luam tawm piav qhia txog kev kho laser cladding ntawm lub siab-siab turbine hniav siv Stellite 21 hmoov, nrog rau cov hniav kho uas qhia tau hais tias muaj zog tensile zog thiab elongation piv rau conventionally manufactured siv cov ntaub ntawv. Qhov no qhia txog lub luag haujlwm ntawm cov alloy hauv kev kho cov khoom muaj txiaj ntsig zoo uas qhov thermal qaug zog thiab kev ncaj ncees ntawm cov qauv yog qhov tseem ceeb.
Ib qho kev txwv tsim nyog rau qhov tseem ceeb: Stellite 21's tsawg carbide ntim txhais tau hais tias nws muaj kev txwv tsis pub muaj kev cuam tshuam rau cov khoom tawv tawv. Nyob rau hauv cov xwm txheej hnyav hnyav nrog cov khoom ntse ntawm qhov nrawm, Stellite 6 tseem yog qhov kev xaiv tsim nyog.
Tsib nqe lus nug kom paub meej ua ntej qhia txog Stellite 21 Tshooj
Thaum koj tau txiav txim siab tias a xov xwm 21 part yog qhov kev taw qhia yog, cov kauj ruam tom ntej yog xyuas kom meej tias tus neeg muag khoom tuaj yeem xa cov khoom koj xav tau. Kev xaiv alloy ib leeg tsis txaus, vim tias Stellite 21 cov khoom siv kho tshuab nyob ntawm qhov kev tsim khoom thiab kev kho cua sov.
1. Txoj kev tsim khoom yog dab tsi?
Cast, wrought, los yog hardfaced? Txhua tus tsim cov carbide morphology sib txawv, hardness, thiab toughness. Ib qho cam khwb cia thiab lub laser-clad overlay ntawm tib lub nominal alloy tsis sib hloov. Nug tus neeg muag khoom kom hais txog txoj kev qhia meej thiab muab cov ntaub ntawv sawv cev ntawm txoj kev ntawd.
2. Koj puas tuaj yeem muab hardness faib thoob plaws?
Ib qho hardness nyeem ntawm ib daim coupon xeem tsis paub meej tias cov khoom tiav. Thov cov ntaub ntawv hardness ntau lub ntsiab lus, tshwj xeeb tshaj yog rau cov khoom uas muaj qhov sib txawv ntawm ntu tuab lossis cov lus teb kho cua sov.
3. Kev kho cua sov yog dab tsi?
Stellite 21 tuaj yeem ua haujlwm hnyav thaum ua haujlwm thiab hnav. Qhov kev xa tawm tseem ceeb. Yog hais tias annealing los yog kev ntxhov siab tau ua tiav, cov ntaub ntawv yuav tsum muaj. Yog hais tias ib feem yog siv nyob rau hauv kev ua hauj lwm-hardened mob, qhov luaj li cas thiab uniformity ntawm kev ua hauj lwm hardening yuav tsum tau sau tseg.
4. Puas muaj pov thawj cuam tshuam rau hom kev ua tsis tiav?
Yog vim li cas rau xaiv Stellite 21 yog thermal qaug zog tsis kam los yog galling resistance, nug seb tus neeg muag khoom puas muaj kev paub los yog cov ntaub ntawv ntsuam xyuas hais txog cov txheej txheem tshwj xeeb. General alloy datasheets yog qhov pib, tsis yog qhov hloov pauv rau daim ntawv thov tshwj xeeb pov thawj.
5. Cov ntaub ntawv dab tsi nrog rau ntu?
Cov ntaub ntawv pov thawj, traceability rau lub tshav kub los yog ntau, thiab cov ntaub ntawv tshuaj xyuas yuav tsum tau teev tseg. Rau kev pabcuam tseem ceeb, daim ntawv pov thawj yuav tsum txheeb xyuas cov alloy los ntawm UNS tus lej (R30021 rau Stellite 21) thiab cov qauv siv tau.
FAQ
Puas yog Stellite 21 ntau corrosion-resistant dua Stellite 6?
Hauv qee qhov kev tshaj tawm, tshwj xeeb yog txo qis lossis nyuaj acidic ib puag ncig, Stellite 21 tau pom zoo dua corrosion kuj hauv cov kev tshawb fawb sib piv. Txawm li cas los xij, nws tsis yog universally superior. Qhov nruab nrab, qhov kub thiab txias, thiab lub xeev aeration txiav txim siab txog kev ua haujlwm, thiab kev ntsuam xyuas corrosion rau qhov kev pabcuam tiag tiag. Stellite 6, piv txwv li, tau pom zoo tiv thaiv cavitation yaig hauv kev sib piv cov kev tshawb fawb.
Kuv puas tuaj yeem hloov Stellite 6 rau Stellite 21 yam tsis tau hloov tus qauv?
Tsuas yog tias qhov tsis ua haujlwm mechanism tsis nyob ntawm cov khoom sib txawv ntawm lawv. Yog tias thawj qhov laj thawj ntawm kev xaiv Stellite 21 yog thermal qaug zog tsis kam lossis tsis kam ua haujlwm, hloov Stellite 6 yuav tsis daws qhov teeb meem thiab tuaj yeem ua rau nws tsis zoo. Kev xaiv yuav tsum tau rov mus xyuas dua li qhov ua tsis tiav tiag tiag.
Puas yog Stellite 21 nyuaj txaus rau hnav daim ntaub ntawv?
Hardness ib leeg yog ib qho kev xaiv tsis zoo. Stellite 21 yog softer dua Stellite 6 nyob rau hauv raws li-deposited mob tab sis muaj peev xwm ua hauj lwm-harden nyob rau hauv kev pab cuam (txog li 48 HRC), thiab nws cov kev ua tau zoo hnav nyob ntawm lub mechanism. Rau qhov hnyav-particle abrasion, Stellite 6 feem ntau nyiam. Rau zawv zawg hnav, galling, lossis thermal cycling, Stellite 21 tuaj yeem ua tau zoo dua txawm tias qis dua thawj zaug.
Puas yog ob qho tib si alloys tuaj yeem siv los ntawm hardfacing?
Yog lawm. Stellite 6 yog qib hardfacing ntau dua, tab sis Stellite 21 kuj muaj xws li vuam hlau thiab hmoov rau overlay thiab cladding txheej txheem. Cov txheej txheem tsis sib xws thiab kev tswj qhov sib txawv, thiab tus neeg muag khoom yuav tsum muaj cov txheej txheem tsim nyog rau kev sib xyaw ua ke ntawm cov alloy thiab substrate.
Dab tsi yog qhov feem ntau saib xyuas tshwj xeeb thaum xaj Stellite 21 qhov chaw?
Txoj kev tsim khoom thiab kev kho cua sov. Cov yam ntxwv no cuam tshuam rau cov khoom kawg ntau dua li cov nominal alloy muaj pes tsawg leeg rau Stellite 21, thiab kev yuav khoom tshwj xeeb uas tsuas yog cov qib alloy tawm ntawm qhov tseem ceeb ntawm cov khoom tsis tau txhais.
Thov Kev Pabcuam Kev Pabcuam lossis Cov Ntaub Ntawv Pov Thawj
Yog tias koj tab tom ntsuas a cobalt alloy qhov rau ib daim ntawv thov hnav lossis corrosion thiab yuav tsum tau txiav txim siab seb Stellite 21 lossis Stellite 6 yog qhov zoo dua, cov kauj ruam tom ntej tshaj plaws yog qhia cov duab kos thiab cov lus piav qhia ntawm hom kev xav tsis zoo nrog tus neeg muag khoom uas ua haujlwm nrog ob qho tib si alloys. Qhia qhov ntsuas kub ntawm kev pabcuam, kev caij tsheb kauj vab, qhov chaw mating, thiab nruab nrab corrosive yog tias muaj. Ib tus neeg muag khoom tau ntsib nrog Stellite alloy qhov chaw yuav tsum muaj peev xwm sib tham txog kev lag luam tawm kom pom tseeb thiab muab cov ntaub ntawv pov thawj, cov ntaub ntawv hardness, thiab cov ntaub ntawv tsim khoom rau cov khoom uas koj xav txog.
