316Ti vs 316L: Puas yog Titanium Stabilization tseem ceeb?

Taw qhia

Thaum muab cov hlau tsis muaj steel rau kev thov daim ntawv thov - txawm nyob rau hauv cov tshuaj nroj tsuag, aerospace assemblies, tshuaj ntau lawm, los yog marine ib puag ncig - kev xaiv ntawm cov khoom qib yog ib qho tseem ceeb. Ntawm cov khoom sib piv feem ntau yog 316Ti (UNS S31635) thiab 316L (UNS S31603). Ob leeg yog austenitic stainless hlau muab tau los ntawm qib 316, ob qho tib si muaj molybdenum rau superior corrosion kuj, thiab ob qho tib si muaj nyob rau hauv daim ntawv, phaj, yeeb nkab, bar, thiab coil daim ntawv.

Txawm li cas los xij lawv txawv nyob rau hauv ib txoj kev txiav txim siab: 316Ti muaj titanium ua lub zog ruaj khov, thaum 316L hais txog kev txhawj xeeb txog kev ntxhov siab los ntawm ultra- cov ntsiab lus carbon tsawg. Kab lus no piav qhia seb titanium stabilization yog dab tsi, vim li cas nws tau tsim, ob qib ua haujlwm li cas ntawm ib sab, thiab qib twg yog qhov tsim nyog rau koj cov ntaub ntawv siv tshwj xeeb.

Txawm hais tias koj yog ib tus kws tsim khoom tsim cov khoom siv rau cov nroj tsuag tshiab, tus kws tshaj lij kev muag khoom sib piv cov khoom lag luam, lossis tsuas yog tus neeg yuav khoom tab tom nrhiav kev txiav txim siab, phau ntawv qhia no muab qhov tseeb thiab cov ntaub ntawv koj xav tau - yam tsis muaj jargon.

Titanium Stabilization yog dab tsi?

Qhov teeb meem: Sensitization thiab Weld Decay

Yuav kom nkag siab tias vim li cas titanium stabilization tseem ceeb, peb yuav tsum xub to taub qhov teeb meem nws daws tau. Standard austenitic stainless hlau, suav nrogqib 316,muaj cov pa roj carbon. Thaum cov hlau no raug kub hnyiab ntawm kwv yees li 425℃thiab 870℃(800℃F–1,600℃F) - ib qho kev tshwm sim feem ntau tshwm sim thaum vuam - carbon atoms tsiv mus rau thaj tsam lis thiab hnov ​​​​mob nrog chromium los tsim chromium carbides (Cr23C6).

Cov tshuaj tiv thaiv no depletes cov ntsiab lus chromium nyob ze ntawm cov qoob loo. Txij li thaum chromium yog lub luag haujlwm tseem ceeb rau kev tiv thaiv corrosion, nws depletion tsim "sensitized" zones uas muaj kev cuam tshuam rau intergranular corrosion, tseem hu ua weld lwj. Nyob rau hauv ib puag ncig kev pabcuam corrosive, qhov no tuaj yeem ua rau lub cev tsis ua haujlwm ntxov.

Titanium Solution

Titanium stabilization ua haujlwm los ntawm kev qhia titanium - muaj zog carbide qub - rau hauv cov hlau. Vim tias titanium muaj kev sib raug zoo ntau dua rau cov pa roj carbon ntau dua li cov chromium, titanium nyiam khi nrog cov pa roj carbon monoxide los tsim titanium carbides (TiC) es tsis txhob chromium carbides. Qhov no khaws chromium hauv kev daws, tiv thaiv cov ciam teb.

Qhov tsawg kawg nkaus titanium cov ntsiab lus hauv 316Ti tau teev tseg raws li tsib npaug ntawm cov ntsiab lus carbon (5 × C), kom ntseeg tau tias muaj cov titanium txaus los khi tag nrho cov pa roj carbon monoxide. Qhov tshwm sim yog cov hlau uas tuaj yeem welded los yog siv ntawm qhov kub thiab txias yam tsis poob nws cov corrosion kuj ntawm cov ciam teb.

Xav txog nws li no: yog tias cov pa roj carbon atom yog cov teeb meem nrhiav kev sib raug zoo nrog chromium (tus neeg saib xyuas lub cev), titanium cov kauj ruam hauv kev ua tus khub zoo nkauj dua, ua kom cov neeg muaj teeb meem nyob thiab tus neeg saib xyuas tsis pub ua nws txoj haujlwm.

Kev sib piv tshuaj lom neeg

Cov lus hauv qab no nthuav tawm cov tshuaj muaj pes tsawg leeg rau 316Ti, 316L, thiabxwm 316Raws li ASTM A276 / ASTM A240 thiab EN 10088 tus qauv.

Table 1: Chemical Composition - 316Ti vs 316L vs 316 (wt%)

Tau qhov twg los: ASTM A276, ASTM A240, EN 10088-1. Tus nqi yog nominal ranges rau siv.

Qhov tseem ceeb sib txawv yog unmistakable:316 Tinqa titanium ntawm qhov sib piv ntawm tsawg kawg tsib npaug ntawm nws cov ntsiab lus carbon, thaum 316L ua tiav qhov kev xav tau los ntawm kev txwv cov pa roj carbon ntau tshaj 0.03% - kwv yees li ib feem peb ntawm qhov txwv tau tso cai hauv tus qauv 316. Ob lub tswv yim zoo, tab sis raws li peb yuav pom, lawv haum rau kev ua haujlwm sib txawv.

Mechanical Properties

Ob leeg 316Ti thiab 316L muab kev ua haujlwm zoo heev rau cov khoom siv thiab cov txheej txheem. Txawm li cas los xij, lub xub ntiag ntawm titanium hauv 316Ti muab cov txiaj ntsig me me los ntawm kev ua kom zoo ntawm cov nplej thiab carbide dispersion hardening, ua rau muaj zog tensile thiab yield zog me ntsis.

Table 2: Cov Ntsiab Lus Mechanical Properties - 316Ti vs 316L

Tau qhov twg los: ASTM A276, EN 10088-3, chaw tsim tshuaj paus ntaub ntawv cov ntaub ntawv. Cov khoom ntawm chav tsev kub (20 degree).

Qhov tseem ceeb tshaj plaws kev sib txawv ntawm cov neeg kho tshuab tshwm sim ntawm qhov kub siab. Raws li kev khiav hauj lwm kub nce siab tshaj 500 degree, 316Ti khaws cia zoo dua creep kuj thiab siab zog dua 316L, uas yog lwm qhov zoo ntawm titanium carbide network nyob rau hauv lub microstructure.

Corrosion Resistance: Kev Pom Zoo

Ob leeg 316 Ti thiab316Lyog engineered los tiv thaiv rhiab heev, tab sis los ntawm kev sib txawv mechanisms . 316L ua tiav qhov no los ntawm kev txo cov pa roj carbon tsawg rau kev tsim chromium carbide. 316Ti neutralizes carbon los ntawm khi rau titanium. Hauv kev xyaum, ob qho tib si ua tau zoo sib xws hauv cov qauv corrosive ib puag ncig ntawm qhov kub nruab nrab.

Txawm li cas los xij, hauv cov ntawv thov uas cuam tshuam ntev tshaj 500℃- xws li cov khoom siv hluav taws xob sib hloov, cov khoom siv rau hauv cub tawg, lossis siab -kub tshuaj reactors - 316L pib qhia qhov txwv. Txawm tias muaj cov pa roj carbon tsawg, qhov ntev ntawm cov thermal raug tseem tuaj yeem ua rau maj mam carbide nag lossis daus . 316Ti's titanium buffer muab kev tiv thaiv ntev dua - lub sij hawm tiv thaiv hauv cov xwm txheej no.

Ob qib muaj 2-3% molybdenum, uas ua rau muaj kev tiv thaiv zoo rau pitting thiab crevice corrosion nyob rau hauv chloride-muaj ib puag ncig xws li dej hiav txwv, tshuaj dawb, thiab acidic chloride media. Tsis muaj qib twg muaj txiaj ntsig zoo dua lwm tus hauv qhov no. Yog tias qhov siab tshaj pitting kuj yuav tsum tau, xav txog kev kho dua tshiab rau 317L lossis duplex qib xws li 2205.

Ob leeg 316Ti thiab 316L muaj kev cuam tshuam rau chloride -induced stress corrosion cracking nyob rau hauv siab chloride concentrations thiab siab kub (feem ntau tshaj 60℃). Qhov no susceptibility yog ib tug general yam ntxwv ntawm austenitic stainless hlau. Rau ib puag ncig uas muaj kev pheej hmoo loj SCC, duplex stainless hlau lossis npib tsib xee alloys xws li Alloy 825 lossis Alloy 625 yuav tsum tau txiav txim siab.

Kev sib piv ntawm daim ntawv thov

Qhov kev xaiv ntawm 316Ti thiab 316L thaum kawg los txog rau qhov tshwj xeeb xav tau ntawm koj daim ntawv thov. Cov lus hauv qab no muab cov lus qhia siv tau raws li cov xwm txheej kev lag luam.

Table 3: Application Suitability - 316Ti vs 316L

Nco tseg: ✔=Pom zoo, ✘=Tsis pom zoo, Muaj peev xwm=Ntsuam xyuas raws li cov cai tshwj xeeb.

Kev lag luam Standards thiab Ntiaj teb no Designations

Kev nkag siab txog lub npe thoob ntiaj teb cov lus pom zoo rau cov qib no yog qhov tseem ceeb thaum nrhiav khoom thoob ntiaj teb, tshuaj xyuas cov ntaub ntawv xeem cov ntaub ntawv (MTRs), lossis qhia meej hauv cov duab kos duab.

Table 4: Tus Qauv Tsim los ntawm Cheeb Tsam

Ib txwm thov Daim Ntawv Qhia Txog Mill Test (MTR/CMTR) thiab txheeb xyuas tus lej UNS lossis EN ntawm daim ntawv pov thawj thaum yuav khoom qib.

Kev Taw Qhia Kev Xaiv Ceev

Table 5: 316Ti vs 316L - Nyob rau hauv ib qho yooj yim xaiv Guide

Nqi thiab Muaj Kev Xav Tau

316L feem ntau yog qhov dav thiab muaj nqi ntau dua - kev xaiv zoo. Nws yog tus qauv ua haujlwm qib uas pom nyob rau hauv cov chaw xa khoom thoob ntiaj teb hauv txhua daim ntawv khoom - daim ntawv, phaj, yeeb nkab, raj, bar, thiab fittings. Lub sij hawm txhuas rau 316L feem ntau luv dua.

316Ti, thaum muaj los ntawm cov mills tshwj xeeb thiab cov neeg xa khoom, hais kom tus nqi qis qis vim yog qhov sib ntxiv ntawm titanium thiab ntau qhov kev xav tau melting. Txawm li cas los xij, tus nqi sib txawv feem ntau yog qhov ncaj ncees thaum daim ntawv thov xav tau cov thermal lossis cov qauv zoo uas 316Ti muab. Qhia txog 316Ti qhov twg 316L yuav txaus ntxiv tus nqi tsis tsim nyog; conversely, siv 316L nyob rau hauv ib tug siab - daim ntawv thov kub qhov twg 316Ti yog yuav tsum tau muaj kev pheej hmoo ua tsis ua hauj lwm ntxov ntxov thiab raug nqi downtime.

Thaum sib piv cov nqe lus, nco ntsoov xyuas kom koj muab cov khoom sib piv, thickness / txoj kab uas hla, nto tiav, thiab qib ntawv pov thawj. Ib yam khoom uas zoo li pheej yig dua tab sis tsis muaj daim ntawv pov thawj xav tau lossis qhov ntev ntev yuav raug nqi ntau dua.

Cov lus nug nquag nug (FAQ)

Yog lawm. 316L's ultra- cov ntsiab lus qis carbon (tsawg dua lossis sib npaug li 0.03%) yog tsim tshwj xeeb los txo qis kev hnov ​​​​mob thaum vuam, ua tom qab- vuam cov cua sov tsis tsim nyog nyob rau hauv feem ntau cov ntawv thov. Qhov no yog ib qho ntawm 316L qhov ua tau zoo tshaj plaws.

Tsis universally . 316Ti yog qhov zoo dua rau siab - daim ntawv thov kub thiab cov xwm txheej uas yuav tsum tau ua kom muaj kev cuam tshuam zoo dua nyob rau lub sijhawm ua haujlwm ntev . 316L yog qhov zoo dua rau kev siv tshuaj, khoom noj khoom haus- qib, thiab kev siv corrosion dav dav ntawm qhov nruab nrab kub. Qib "zoo dua" nyob ntawm koj qhov kev ua haujlwm tag nrho.

Lub 'L' sawv cev rau Tsawg Carbon. 316L muaj qhov siab tshaj plaws ntawm 0.03% carbon, piv rau 0.08% hauv tus qauv 316 thiab 0.08% hauv 316Ti. Cov pa roj carbon tsawg no yog qhov tiv thaiv kev nkag siab zoo thaum vuam.

'Ti' yog hais txog Titanium - cov khoom ruaj khov ntxiv rau 316Ti. Titanium nyiam sib txuas nrog cov pa roj carbon, tiv thaiv nws los ntawm kev cuam tshuam nrog chromium ntawm qhov kub siab.

Hauv ntau qhov ambient -kev siv kub, yog. Txawm li cas los xij, rau siab - kub lossis ntev thermal raug daim ntawv thov, 316Ti yog qhov tseeb specification. Nco ntsoov nrog koj tus engineer lossis tus kws tshaj lij cov ntaub ntawv ua ntej hloov ib qib rau lwm qhov hauv cov ntawv thov tseem ceeb.

Ib txwm thov Daim Ntawv Qhia Txog Mill Test (MTR) lossis Certified Material Test Report (CMTR) lees paub ua raws li tus qauv tsim nyog (xws li ASTM A276, A240, lossis EN 10088). Rau cov ntawv thov tseem ceeb, thov daim ntawv pov thawj thib peb -tog soj ntsuam cov ntaub ntawv pov thawj, cov txiaj ntsig zoo ntawm cov ntaub ntawv pov thawj (PMI), thiab cov lus tshaj tawm txog kev ua raws li txoj cai kev lag luam (xws li ASME, PED, NACE).

Xaus

Titanium stabilization nyob rau hauv 316Ti tsis yog ib tug me me metallurgical footnote - nws yog ib tug txhob txwm engineering daws rau ib tug tshwj xeeb thiab zoo -cov ntaub ntawv tsis ua hauj lwm hom. Rau cov ntawv thov ntawm qhov kub siab, nrog kev vuam dav dav, lossis xav tau ntev -lub sij hawm tiv thaiv kev cuam tshuam rau intergranular corrosion, 316Ti muaj qhov zoo uas 316L tsis tuaj yeem ua tiav tag nrho.

Nyob rau tib lub sijhawm, 316L tseem yog cov khoom siv zoo tshaj plaws rau ntau yam kev lag luam, kev kho mob, thiab khoom noj khoom haus - cov ntawv thov qib uas nws cov ntsiab lus carbon tsawg muab kev tiv thaiv txaus thiab nws cov yam ntxwv ntawm lub ntsej muag du thiab tus nqi qis ua rau nws xaiv qhov zoo.

Raws li cov chaw tsim khoom thiab cov khoom lag luam ntawm stainless hlau thiab npib tsib xee alloy cov khoom, peb ua haujlwm nrog ob qib txhua hnub thiab npaj ntau yam ntawm cov ntaub ntawv khoom kom tau raws li qhov xav tau tshaj plaws. Peb pab neeg ua haujlwm muaj peev xwm los pab nrog kev xaiv cov khoom siv, kev tshuaj xyuas ntawv pov thawj, thiab kev ua raws cai.

Yog tias koj tsis paub meej tias qib twg yog rau koj daim ntawv thov,tiv tauj peb- peb yuav pab koj hu txoj cai thawj zaug.