Monel K500 vs Inconel 718: Siab -Lub zog nickel alloy sib piv rau Marine Fasteners

Monel K-500 thiab Inconel 718 yog dab tsi, thiab lawv cov cuab yeej siv zog sib txawv li cas?

Monel K-500 yog npib tsib xee- tooj liab alloy ntxiv dag zog los ntawm kev ntxiv aluminium thiab titanium los ua gamma-prime (Ni3(Ti,Al)) precipitates, thaum Inconel 718 yog npib tsib xee- hlau{-chromium alloy ntxiv dag zog los ntawm primarily{8} gamma-double-prime (Ni3Nb) - qhov sib txawv hauv paus chemistry (tooj liab piv rau chromium raws li tus khub loj alloying rau npib tsib xee) uas ua rau feem ntau ntawm cov tswv yim sib txawv hauv kab lus no.

Tau qhov twg los: Tshwj xeeb Metals Corporation cov ntaub ntawv xov xwm SMC-062 (MONEL alloy K-500) thiab SMC-045 (INCONEL alloy 718).

K-500's tooj liab-raws li chemistry yog dab tsi muab nws Monel- tsev neeg seawater kuj; 718's chromium cov ntsiab lus yog dab tsi ua rau nws dav dua acid thiab siab -kub oxidation tsis kam tab sis ua rau nws chemically ze rau stainless-steel thiab superalloy tsev neeg dua li Monel tsev neeg. Ob lub alloys ncav cuag lub zog siab dhau los ntawm tib lub hnub nyoog dav dav -txoj cai hardening - precipitating ib tug nplua, coherent intermetallic theem los ntawm kev daws annealing ua raws li kev tswj kev laus - tab sis qhov tshwj xeeb precipitate, nws cov kinetics, thiab nws cov txiaj ntsig rau kev vuam thiab hydrogen tus cwj pwm txawv, raws li cov lus piav qhia tom qab.

Yuav Ua Li Cas Ob Lub Alloys Sib Piv Hauv Lub Zog rau Kev Siv Fastener?

Inconel 718 muab lub ntsiab lus siab dua qhov kev lees paub lub zog ntau dua Monel K-500 ntawm qib tshwj xeeb tshaj plaws cuam tshuam rau cov fasteners: AMS 5663 yuav tsum muaj 180 ksi (1,241 MPa) lub zog tensile yam tsawg kawg nkaus thiab 150 ksi (1,034 MPa) yam tsawg kawg nkaus tawm los rau 718, thaum {10} ceev ceev rau ASTM F{ tsuas yog 130 ksi (896 MPa) yam tsawg kawg nkaus tensile thiab 90 ksi (620 MPa) yam tsawg kawg nkaus tawm los.

Tau qhov twg los: ASTM F468 fastener yuav tsum rau UNS N05500; SAE AMS 5663 cov cai rau UNS N07718; Tshwj xeeb Metals Corporation cov ntawv xov xwm tshaj tawm SMC-062 rau K-500's mills-daim ntawv ntau yam khoom.

Qhov no kwv yees li 1.4x tensile thiab 1.7x yield zog kom zoo dua rau 718 yog qhov tseeb, qhov sib txawv ntawm qhov sib txawv, tsis yog ib qho marginal - nws txhais tau hais tias me me -inch 718 fastener tuaj yeem nqa tib lub thauj khoom loj dua K-500 fastener, uas tseem ceeb ncaj qha rau cov khoom hnyav. K-500's tus kheej zeb- daim ntawv cov cuab yeej (Table 6 ntawm nws cov ntawv xov xwm tshwj xeeb hlau) tuaj yeem ncav cuag cov lej siab dua hauv cov txheej txheem txias txias, muaj hnub nyoog tag nrho, tab sis qhov ceev tshwj xeeb ASTM F468 yam tsawg kawg yog tus lej uas tswj xyuas kev yuav khoom thiab tsim rau bolting tshwj xeeb.

Yuav Ua Li Cas Ob Lub Alloys Sib Piv hauv General Seawater Corrosion Resistance?

Monel K-500's corrosion resistance yog, nyob rau hauv Tshwj xeeb Metals 'tus kheej cov lus, "sib npaug rau cov alloy 400" - zoo heev nyob rau hauv ntws seawater, nrog ib tug nyiam mus rau pitting tsuas yog nyob rau hauv stagnation los yog qeeb - txav dej - thaum Inconel tus kheej cov ntaub ntawv 718 liters resistant rau crevice corrosion li alloys 625, 625LCF thiab 725, "ua rau nws qhov kev sib piv tsis muaj zog ntawm ob qhov tshwj xeeb hauv kev nruj-crevice, stagnant seawater tej yam kev mob.

Qhov no yog qhov muaj txiaj ntsig zoo, feem ntau- tsis pom kev sib txawv: 718 feem ntau xav tias yog corrosion- zoo tshaj rau txhua cov hlau nws tawm- lub zog, tab sis Cov Hlau Tshwj Xeeb 'tus kheej seawater crevice-corrosion sib piv nws qab ntau ntawm nws tus kheej Inconel{5}.fas. Rau marine fasteners tshwj xeeb - uas los ntawm lawv cov xwm txheej tsim crevices ntawm kev sib txuas sib txuas, hauv qab ntxhua khaub ncaws, thiab ntawm cov hauv paus hniav - qhov crevice no -corrosion sib txawv yog ncaj qha cuam tshuam, thiab tsis yog alloy qhov kev ua tau zoo corrosion yuav tsum tau suav tias yog superior thoob plaws lub rooj tsavxwm yam tsis tau kuaj xyuas qhov tsis ua hauj lwm hom lus nug.

Puas yog Monel K-500 thiab Inconel 718 Ob leeg muaj kev cuam tshuam rau Hydrogen Embrittlement Raws li kev tiv thaiv Cathodic?

Yog - thiab qhov no yog qhov tseeb tseem ceeb tshaj plaws hauv qhov kev sib piv no. Peer- tshuaj xyuas NACE thiab US Department of Energy (OSTI) cov ntaub ntawv tshawb fawb uas ib txwm ua haujlwm ntawm cathodic tiv thaiv kab ke ua rau hydrogen embrittlement tsis ua haujlwm ntawm subsea bolts ua los ntawm Monel K-500, thiab ua raws li- nce qeeb- lim- ntsuas ntsuas tau pom tib yam cathodic{10} embrittlement cuam tshuam rau Inconel 718, Inconel X-750, Ferralium 255, high-strength steel, thiab 13% chromium alloys.

Cov ntaub ntawv tau lees tias TSIS embrittled nyob rau hauv tib lub cathodic - kev tiv thaiv kev ntsuas yog beryllium tooj liab, A-286 steel, Beta-C titanium, thiab steel tuav rau qhov sib piv qis 115 ksi (793 MPa) yield zog - tsis suav nrog cov ntawv luv luv no. Qhov no yog qhov kev kho tseem ceeb rau ib qho kev xav hauv marine thiab offshore engineering: hloov lub fastener los ntawm Monel K-500 rau Inconel 718 tsis, los ntawm nws tus kheej, tshem tawm cov cathodic - tiv thaiv hydrogen embrittlement txaus ntshai. Ob lub alloys txhim kho lawv cov bolting{13}} qib zog los ntawm lub hnub nyoog hardening mus rau qhov sib piv nyuaj, siab - lub zog, thiab nws yog qhov sib xyaw ua ke ntawm lub zog siab / hardness nrog hydrogen uptake nyob rau hauv cathodic polarization - tsis yog cov tsev neeg alloy tshwj xeeb - uas ua rau hom tsis ua haujlwm no.

Cov ntaub ntawv K-500 subsea bolt tsis ua haujlwm tau taug qab mus rau qhov sib txawv ntawm qhov sib txuam nrog hydrogen embrittlement los ntawm cathodic polarization, tshwj xeeb tshaj yog thaum txuas rau aluminium sacrificial anodes; qeeb- lim- ntsuas ntsuas ntawm cov khoom siv los ntawm qhov ua tsis tau tiag tiag ntsia liaj qhov rooj rov tsim cov pob txha tawg zoo sib xws rau qhov ua tsis tiav. Cov kev tshawb fawb sib cais kuj tau txheeb xyuas qhov chaw hydrogen-pab tawg hauv cov hnub nyoog K-500 raug dej hiav txwv thiab ua ke rau zinc, txawm tias tsis muaj qhov cuam tshuam rau sab nraud cathodic tiv thaiv, thaum yaj cov qib hydrogen ua kom ntev ntev.

Dab tsi Hardness txwv yuav tsum Marine Fasteners nyob rau hauv cov Alloys hwm?

Rau Monel K-500, kev coj ua kev lag luam thiab cov qauv kev coj ua tau sib koom ua ke ntawm kev txwv cov hnub nyoog tawv rau kwv yees li 34-35 HRC siab tshaj plaws rau kev tiv thaiv cathodically lossis qaub- kev pabcuam bolting - NACE MR0175/ISO 15156 daim ntawv teev npe K-505 ntawm lossis qis dua txij li qib qis dua li 3 25 HRC nyob rau hauv kev txhawb nqa load thiab cathodic polarization, lub ntsiab lus ntawm lub qab nthab hardness txo tab sis tsis tshem tawm kev pheej hmoo.

Qhov nuance no tseem ceeb: ib tug phooj ywg - tshuaj xyuas cov ntaub ntawv keeb kwm piav qhia yob - xov K-500 bolts, annealed thiab hnub nyoog mus rau ib tug sib piv me me 25 HRC - hauv qab no feem ntau hais txog 35 HRC txwv - uas tseem ua tsis tau tejyam nyob rau hauv cathodicly load rau ib xyoo 60% ntawm yield zog. Qhov no tsis txhais hais tias hardness txwv tsis muaj txiaj ntsig; hardness siab dua yog qhov muaj feem cuam tshuam nrog kev nce siab thiab kev loj hlob sai dua, thiab nyob qis dua 34-35 HRC tseem yog tus qauv kev pheej hmoo-txo kev xyaum.

Nws txhais tau hais tias daim ntawv pov thawj hardness ib leeg yuav tsum tsis txhob raug kho ua pov thawj tias K-500 (los yog 718) fastener tiv thaiv hydrogen embrittlement nyob rau hauv cathodically tiv thaiv kev pab cuam - lub peev xwm cathodic nws tus kheej, theem load, thiab lub sij hawm raug tag nrho cov teeb meem nrog rau hardness.

Yam khoom twg yog qhov yooj yim dua rau vuam thiab kho?

Inconel 718 yog ib lub hnub nyoog weldable ntau dua -nickel alloys hardenable vim nws gamma-ob npaug- prime zog ntxiv cov ntaub ntawv maj mam, tab sis Monel K-500 weldments ua nrog cov alloy tus kheej cov lus pom zoo muab tub lim (Monel Filler Hlau 60} tsis tuaj yeem ua kom muaj zog thiab muaj hnub nyoog 80) yog li tsis tuaj yeem sib tw {8. hardened K-500 lub hauv paus hlau - ua kom muaj zog sib xws yuav tsum muaj qhov sib txawv, sib txuam-sib xyaw muab cov hlau uas Cov Hlau tshwj xeeb nws tus kheej tsis muab.

Cov Hlau Tshwj Xeeb hais ncaj qha rau qhov no: "cov weldments tsis muaj hnub nyoog hardenable thiab, yog li, tsis muaj lub zog sib piv ntawm cov tawv tawv hauv paus hlau. Weldments xav tau lub zog zoo ib yam li lub hnub nyoog hauv paus hlau yuav tsum tau muab tso rau hauv cov hlau ntawm cov khoom sib txuam uas muaj los ntawm lwm tus neeg muag khoom." Qhov no yog qhov muaj txiaj ntsig zoo sib txawv rau kev kho kom nrawm, rov qab kho dua, lossis tsim kho- kho vajtse: K-500 kev kho vuam siv cov txheej txheem muab tub lim yuav tawm hauv thaj chaw tsis muaj zog tshwj tsis yog qhov tshwj xeeb sib txuam muab tub lim thiab tag nrho cov ntawv tshaj tawm-weld tov-anneal-ntau dua li ntawm kev npaj, thiab ntau dua cov pa weldability (nrog rau cov ncauj lus kom ntxaws ntxiv nyob rau hauv ib tsab xov xwm tus khub ntawm 718 forging thiab kev kho cua sov) feem ntau tso cai rau txoj hauv kev yooj yim dua rov qab mus rau tag nrho lub zog.

Qhov ntsuas kub npaum li cas yog Txhua Alloy haum rau?

Monel K-500 qhov kev pab cuam lub qab nthab yog nyob ib ncig ntawm 500℃F (260 degree) - qhov kub ntawm lub caij nplooj ntoos hlav so cov ntaub ntawv qhia tias tsis muaj peev xwm poob rau lub sij hawm - thaum Inconel 718 tseem muaj txiaj ntsig tsis tu ncua mus txog kwv yees li 1,300℃F (704℃1} ua ntej nws tus kheej {priledo gamma theem 1} pib hloov mus rau qhov tsis yog{13}} ua kom muaj zog delta theem, muab 718 qhov dav dav dav dav rau qhov kub kub.

Ob lub alloys ua tau zoo tshwj xeeb ntawm qhov kub thiab txias, khaws cov ductility thiab toughness yam tsis muaj ductile - mus rau - nkig hloov txawm nyob ze cov kua hydrogen kub rau K-500, uas yog ib qho laj thawj ob qho tib si alloys pom siv nyob rau hauv cryogenic thiab qis -kub marine thiab aerospace hardware. Tab sis rau txhua daim ntawv thov marine fastener nrog lub siab tiag tiag - qhov kub thiab txias raug - cav- cov khoom siv uas nyob ib sab, tso tawm - cov khoom siv nyob ib sab, lossis cov khoom siv ua haujlwm kub - 718 qhov kub siab tshaj qab nthab ua rau nws tsuas yog qhov kev xaiv zoo ntawm ob qho; K-500 saum toj no roughly 500℃F zuj zus poob cov khoom nws lub hnub nyoog-hardening tau tsim los xa.

Puas yog Monel K-500's Non-Magnetic Property yog qhov zoo rau qee yam Marine Fasteners?

Yog - Monel K-500 yog qhov zoo tsis yog- sib nqus txawm tias qhov kub thiab txias (kwv yees permeability nyob ib puag ncig 1.001-1.002), cov khoom tshwj xeeb Cov Hlau tshwj xeeb tshwj xeeb rau cov roj-cov khoom siv tshuaj ntsuam xyuas zoo thiab cov khoom siv hluav taws xob, thiab qhov no tseem yog qhov tseeb, qhov sib txawv ntawm qhov sib txawv ntawm cov khoom siv sib txawv ntawm cov khoom sib nqus zoo dua rau cov khoom siv hluav taws xob zoo dua. cov cuab yeej siv xws li cov vaj tsev nyob, cov minesweeping thiab mine-countermeasure hardware, thiab cov cuab yeej ntsuas ntsuas.

Cov Hlau tshwj xeeb kuj tseem sau tseg qhov kev ua tau zoo: nyias nyias, sib nqus, npib tsib xee-nplua nuj nto zaj duab xis tuaj yeem txhim kho thaum lub sijhawm ua haujlwm yog tias txhuas thiab tooj liab raug xaiv oxidized ntawm qhov chaw, tshwj xeeb tshaj yog nyob rau hauv nyias hlau los yog sawb, tab sis cov yeeb yaj kiab no tuaj yeem raug tshem tawm los ntawm pickling lossis ci dipping los kho cov khoom tsis zoo ntawm - cov khoom sib nqus. Qhov no yog cov lus qhia tshwj xeeb tsim nyog lees paub ntawm daim ntawv txais nyiaj rau txhua daim ntawv thov uas tsis yog- kev ua haujlwm sib nqus yog qhov yuav tsum tau ua nyuaj, vim tias cov khoom siv sab nrauv los ntawm kev ua haujlwm tuaj yeem ua yuam kev rau qhov teeb meem ntawm cov khoom siv ntau.

Cov txheej txheem twg tswj hwm txhua Alloy rau Marine Fastener Procurement?

Monel K-500 fasteners feem ntau tau teev tseg hauv qab ASTM B865 (qhib thiab bar) thiab ASTM F468 (txuas ntxiv- cov kev cai tshwj xeeb), nrog QQ-N-286 Revision G ntxiv qeeb-strain-rate xeem cov cai tshwj xeeb rau kev pabcuam hauv hiav txwv; Inconel 718 fasteners tau teev nyob rau hauv AMS 5662/5663 thiab ASTM B637, nrog rau ob qho tib si alloys ntxiv rau NACE MR0175 / ISO 15156 rau qaub thiab cathodically tiv thaiv kev pabcuam.

Source: ASTM B865, ASTM F468, thiab QQ-N-286 cov cai rau UNS N05500; SAE AMS 5662/5663 thiab ASTM B637 rau UNS N07718; NACE MR0175 / ISO 15156 cov npe hardness; Tshwj xeeb Metals Corporation cov ntawv xov xwm SMC-062 thiab SMC-045.

Dab tsi Alloy Koj Yuav Tsum Qhia rau Marine Fasteners?

Qhia meej Inconel 718 qhov twg muaj zog dua, me dua / sib dua fastener rau ib qho kev thauj khoom, lossis nce siab - qhov kub thiab txias yog qhov yuav tsum tau ua, yog tias qhov project cathodic tiv thaiv kev sib cuam tshuam yog ua tiav; qhia Monel K-500 qhov twg nws tau tsim cov ntaub ntawv marine taug qab, tsis yog- cov khoom sib nqus, thiab lub zog txaus ua tau raws li daim ntawv thov, nrog rau qhov hardness tuav rau 34-35 HRC qab nthab rau kev siv cathodically tiv thaiv lossis qaub-kev pabcuam.

• Xaiv Inconel 718 rau:Cov ntawv thov xav tau lub zog siab tshaj plaws - rau - qhov hnyav piv, lossis cov khoom sib txuas ze ntawm qhov siab siab - cov khoom siv kub tshaj K-500's 500℃F lub qab nthab.
• Xaiv Inconel 718 rau:Cov haujlwm uas muaj peev xwm ua tiav tag nrho (kev tswj xyuas hardness, cathodic muaj peev xwm saib xyuas, thiab/lossis qeeb- lim- ntsuas ntsuas) tuaj yeem siv los tswj cov ntaub ntawv cathodic- tiv thaiv hydrogen embrittlement txaus ntshai koom nrog K-500.
• Xaiv Monel K-500 rau:Fasteners xav tau cov khoom tsis yog-magnetic rau sensor, compass, los yog minesweeping- cov khoom nyob ib sab.
• Xaiv Monel K-500 rau:Cov ntawv thov uas K-500 xyoo xyoo ntawm kev ua haujlwm hauv dej hiav txwv keeb kwm, tsim ASTM F468 fastener specification, thiab QQ-N-286 Revision G marine testing protocol muab txoj hauv kev muaj ntaub ntawv pov thawj zoo.

Rau ob qho tib si alloys:Rau ob qho tib si nyob rau hauv cathodically tiv thaiv los yog subsea kev pab cuam: tuav lub hnub nyoog hardness rau lub qab nthab (tsawg dua los yog sib npaug rau 34-35 HRC rau K-500 ib NACE MR0175), saib xyuas thiab txwv cathodic tiv thaiv muaj peev xwm rau ib qho kev qhia siv tau (xws li, NORSOK), thiab txiav txim siab qeeb - hydrogen{10}}embrittlement- lwm txoj kev tiv thaiv kab mob (xws li A-286 lossis Beta-C titanium) rau qhov tseem ceeb tshaj plaws, qhov ua tau zoo tshaj plaws fasteners.

Cov lus nug nquag

Q: Puas yog Inconel 718 tiv thaiv cov teeb meem hydrogen embrittlement uas tau cuam tshuam Monel K-500?

A: Tsis muaj. Hloov cov alloys ib leeg tsis tshem tawm qhov kev pheej hmoo no; nws yuav tsum tau engineered ib ncig.

Q: Dab tsi hardness txwv yog pom zoo rau Monel K-500 marine fasteners?

A: Kev lag luam xyaum thiab NACE MR0175/ISO 15156 feem ntau txwv K-500 rau 35 HRC siab tshaj plaws rau cathodically tiv thaiv los yog qaub kev pab cuam, txawm tias cov ntaub ntawv tsis ua hauj lwm tau tshwm sim txawm nyob rau hauv hardness tsawg li 25 HRC nyob rau hauv sustained load, yog li ib tug hardness txwv txo tab sis tsis tshem tawm kev pheej hmoo.

Q: Puas yog Inconel 718 muaj zog dua Monel K-500?

A: Yog lawm. AMS 5663 yuav tsum muaj 180 ksi (1,241 MPa) lub zog tensile yam tsawg kawg nkaus rau 718 piv rau ASTM F468's 130 ksi (896 MPa) yam tsawg kawg nkaus rau K-500 fasteners, thiab 718 qhov tsawg kawg nkaus yield zog (150 4 ksi / 1 ksi) K-500's fastener-specification yam tsawg kawg nkaus (90 ksi / 620 MPa).

Q: Cov hlau twg muaj cov dej hiav txwv zoo dua corrosion, Monel K-500 lossis Inconel 718?

A: Nws nyob ntawm hom tsis ua haujlwm. K-500 muaj cov dej hiav txwv dav dav dav dav hauv cov dej ntws (nrog pitting txaus ntshai nyob rau hauv dej khov). Tshwj xeeb Metals 'tus kheej cov ntaub ntawv hais tias Inconel 718 yog tsis tshua muaj resistant rau crevice corrosion tshaj Inconel 625, 625LCF, thiab 725 - ib tug cuam tshuam tsis muaj zog muab rau fastener pob qij txha inherently tsim crevices.

Q: Monel K-500 weld kho puas tuaj yeem phim lub zog ntawm lub hauv paus hardened hlau?

A: Tsis nrog tus qauv pom zoo muab tub lim hlau. Cov Hlau Tshwj Xeeb hais tias kev sib txuas ua los ntawm Monel Filler Metal 60 tsis yog hnub nyoog- tawv thiab yuav tsis sib haum rau lub hauv paus hlau hardened; Kev ua kom muaj zog sib xws yuav tsum muaj kev sib koom ua ke tshwj xeeb- cov khoom muab tub lim hlau los ntawm lwm tus neeg muag khoom ntxiv rau kev daws tag nrho-anneal-thiab- hnub nyoog voj voog.

Q: Qhov kev pabcuam siab tshaj plaws rau Monel K-500 fasteners yog dab tsi?

A: Kwv yees li ntawm 500℃F (260 degree), raws li cov ntaub ntawv so lub caij nplooj ntoos hlav uas qhia txog cov khoom tsis txaus ntseeg saum toj no. Inconel 718 tseem muaj txiaj ntsig txuas ntxiv mus txog kwv yees li 1,300℃F (704 degree), ua rau nws yog qhov kev xaiv tsim nyog rau ib qho kev nce siab -kub marine fastener daim ntawv thov.