1. Q: ASTM Qib 11 titanium alloy yog dab tsi, thiab nws muaj pes tsawg leeg thiab cov khoom zoo li cas piv rau lwm cov khoom lag luam ntshiab thiab palladium-muaj cov qib titanium?
A: ASTM Qib 11 (GR11) yog palladium - ruaj khov ua lag luam ntshiab titanium alloy, raug xaiv raws liTi-0.15 Pd(titanium nrog kwv yees li 0.12% mus rau 0.25% palladium). Nws yog qhov tseem ceebASTM Qib 1 (GR1)nrog rau cov tswv yim sib ntxiv ntawm palladium, ib qho hlau zoo los ntawm pawg platinum. Qhov no me me tab sis tseem ceeb heev alloying ntxiv hloov qhov kev ua tau zoo ntawm cov khoom siv tsis tau hloov pauv nws cov yam ntxwv txhua yam.
Hais txog cov khoom siv kho tshuab, GR11 yuav luag zoo ib yam rau GR1. Nws nthuav tawm lub zog qis tshaj plaws ntawm qib titanium, nrog lub zog tensile yam tsawg kawg nkaus ntawm 240 MPa (35 ksi), lub zog tawm ntawm kwv yees li 170 MPa (25 ksi), thiab ductility zoo heev nrog elongation feem ntau tshaj 24%. Qhov no tso GR11 ntawm qhov kawg ntawm formability thiab weldability nyob rau hauv tsev neeg titanium.
Qhov txawv yog nyob rau hauv corrosion kuj. Thaum GR1 muaj kev ua tau zoo hauv oxidizing ib puag ncig, nws raug kev txom nyem los ntawm kev txo cov kua qaub. Qhov sib ntxiv ntawm 0.15% palladium hloov lub peev xwm corrosion ntawm titanium mus rau qib siab dua (cathodic), ua kom cov khoom nyob twj ywm hauv kev txo cov acid ib puag ncig uas tus qauv lag luam ntshiab titanium yuav corrode sai. Qhov no yog tiav los ntawm ib tug mechanism hu uakev hloov kho cathodic-palladium- cov cheeb tsam nplua nuj nyob rau saum npoo ua raws li cov chaw cathodic zoo, txhawb kev rov ua dua ntawm titanium oxide zaj duab xis txawm tias tsis muaj oxidizers.
Piv rau lwm cov palladium- muaj cov qib:
GR7 (Ti-0.15Pd)yog raws li GR2, muab lub zog siab dua (345 MPa yam tsawg kawg nkaus tensile) tshaj GR11
GR 11yog qhov qis-oxygen, siab- cov khoom siv hluav taws xob raws li GR1
GR 16thiabTSI GR17yog palladium- muaj qhov sib txawv ntawm GR4 thiab GR1 feem, nrog rau cov pa oxygen sib txawv
Rau cov ntawv thov uas xav tau ntau tshaj plaws formability ua ke nrog txhim kho kev txo cov kua qaub, GR11 yog qhov kev xaiv zoo tshaj GR7, vim nws cov ntsiab lus oxygen qis dua muab cov ductility zoo dua rau kev ua haujlwm hnyav.
2. Q: Dab tsi tshwj xeeb corrosion ib puag ncig ua pov thawj rau kev xaiv ntawm ASTM GR11 dhau tus qauv GR1 lossis GR2, thiab dab tsi yog lub tshuab uas palladium txhim khu kev tiv thaiv corrosion?
A: Kev xaiv ntawm ASTM GR11 yog qhov tsim nyog tshwj xeeb hauv ib puag ncig uas tus qauv kev lag luam ntshiab titanium (GR1 lossis GR2) nthuav tawm marginal lossis tsis txaus corrosion. Lub hom phiaj ib puag ncig yogtxo cov kua qaub, tshwj xeebHydrochloric acid (HCl) , sulfuric acid (H₂SO₄), thiabformic acid, tshwj xeeb tshaj yog nyob rau qhov kub thiab txias thiab deearated (oxygen{0}}dawb) tej yam kev mob.
Nyob rau hauv hydrochloric acid, piv txwv li, GR1 nthuav tawm cov nqi corrosion (feem ntau<0.1 mm/year) only at concentrations below 3% and temperatures below 40°C. Beyond these limits, the passive oxide film breaks down, and corrosion accelerates rapidly. GR11, by contrast, can withstand up to approximately 10% HCl at boiling point and shows excellent resistance in higher concentrations at moderate temperatures. Similarly, in sulfuric acid, GR11 extends the useful service range from approximately 5% (for GR1) to 20% or higher at elevated temperatures.
Qhov kev tiv thaiv corrosion kuj muaj xws licathodic hloov kho los ntawm noble hlau ntxiv. Palladium hais, uas muaj txiaj ntsig zoo dua li titanium, raug faib thoob plaws hauv microstructure. Thaum qhov chaw raug rau cov electrolyte corrosive, cov palladium - cov cheeb tsam nplua nuj ua raws li cov chaw cathodic zoo rau cov tshuaj tiv thaiv hydrogen evolution. Qhov no hloov lub peev xwm corrosion ntawm titanium matrix mus rau hauv cheeb tsam passive, qhov chaw tiv thaiv titanium dioxide (TiO₂) zaj duab xis tuaj yeem tsim thiab ruaj khov. Hauv qhov tseem ceeb, qhov sib ntxiv ntawm palladium ua rau cov titanium "tus kheej-passivate" txawm tias nyob hauv ib puag ncig tsis muaj cov pa yaj lossis lwm cov oxidizers.
Qhov tseem ceeb, cov ntsiab lus palladium yog optimized ntawm 0.12-0.25% kom ua tiav cov nyhuv electrochemical yam tsis muaj nqi ntau ntxiv. Rau qhov kev txwv tsis pub muaj kev kub ntxhov, cov qib palladium siab dua xws li GR12 (Ti-0.3Mo-0.8Ni) lossis GR17 (nrog cov ntsiab lus palladium siab dua) yuav raug teev tseg. Txawm li cas los xij, rau feem ntau ntawm cov kev siv tshuaj lom neeg uas GR1 yog marginal, GR11 muab qhov zoo tshaj plaws ntawm kev tiv thaiv corrosion, formability, thiab nqi.
3. Q: Dab tsi yog cov ntawv thov kev lag luam rau ASTM GR11 round bars, thiab vim li cas daim ntawv bar thiaj li haum rau cov ntawv thov no?
A: ASTM GR11 puag ncig tuav yog ua haujlwm nyob rau hauv ntau yam ntawm kev thov tshuaj ua haujlwm, tshuaj, thiab kev siv dej hiav txwv uas qhov kev sib xyaw ua ke ntawm kev tiv thaiv corrosion thiab formability tseem ceeb heev. Daim ntawv bar yog tshwj xeeb tshaj yog muaj nuj nqis rau cov khoom uas yuav tsum tau machining, forging, los yog threading, raws li nws muab cov raw khoom geometry tsim nyog rau tsim complex qhov chaw nrog meej tolerances.
Cov ntawv thov tseem ceeb suav nrog:
Kub Exchanger Tubing thiab Tube Sheet:GR11 yog siv rau cov cua kub exchanger raj thiab cov ntawv raj uas lawv dov los yog welded. Hauv cov nroj tsuag tshuaj uas tuav cov dej hydrochloric lossis sulfuric acid, palladium ntxiv ua kom muaj kev ncaj ncees ntev ntev. Daim ntawv bar yog qhov tseem ceeb rau machining tube nplooj ntawv, uas yuav tsum tau cov qauv qhov tseeb thiab siab - zoo nto tiav rau cov raj txhim khu kev qha- mus rau -tubesheet pob qij txha.
Valve Cheebtsam:Valve stems, rooj zaum, thiab trim Cheebtsam yog nquag tsim los ntawm GR11 bar. Cov Cheebtsam no tau ua rau muaj kev ntxhov siab hauv zos thiab erosive -corrosove tej yam kev mob. Qhov sib ntxiv ntawm palladium muab qhov tsim nyog corrosion kuj hauv kev txo cov kua qaub, thaum daim ntawv bar tso cai rau kev ua haujlwm zoo ntawm cov xov, sealing nto, thiab txoj hauv kev geometries.
Fasteners thiab bolting:Nyob rau hauv ib puag ncig tshuaj lom neeg nruj, tus qauv stainless hlau fasteners tsis txaus. GR11 bar yog machined rau hauv bolts, studs, thiab txiv ntseej rau flange kev sib txuas, cov hlab ntsha siab, thiab cov kav dej. Cov ntaub ntawv zoo heev ductility ua kom cov fasteners tuaj yeem raug torqued zoo yam tsis muaj kev pheej hmoo ntawm nkig puas.
Pump shafts thiab impellers:Rau cov twj tuav cov kua dej corrosive, GR11 bar muab kev sib xyaw ua ke ntawm lub zog, kev tiv thaiv corrosion, thiab kev ua haujlwm qaug zog xav tau rau cov khoom sib hloov. Lub bar daim ntawv tso cai rau zus tau tej cov ntev, ncaj shafts nrog leej concentricity.
Pharmaceutical thiab bioprocessing khoom:Hauv kev tsim tshuaj, qhov khoom purity yog qhov tseem ceeb, GR11 yog siv rau cov khoom uas tiv tauj cov tshuaj ntxuav corrosive lossis cov kua dej ua haujlwm. Qhov tsis muaj tshuaj lom cov ntsiab lus (palladium yog lom lom) thiab cov khoom siv huv huv ua rau nws tsim nyog rau kev tu cev.
Daim ntawv bar feem ntau yog muab rau hauvannealed mob, kom ntseeg tau tias tsis sib xws microstructure thiab zoo ib yam machinability. Rau cov ntawv thov tseem ceeb, cov tuav feem ntau tsis muaj qhov nruab nrab rau kev ua siab ntev, tshem tawm qhov tsis xws luag thiab ua kom ntseeg tau tias cov khoom siv ua tau raws li qhov yuav tsum tau ua kom nruj.
4. Q: Dab tsi yog qhov tseem ceeb ntawm kev tsim khoom thiab kev tswj xyuas zoo rau ASTM GR11 round bars npaj rau ASME Tshooj VIII siab lub nkoj tsim?
A: Thaum ASTM GR11 puag ncig tuav tau teev tseg rau ASME Tshooj VIII siab lub nkoj tsim-xws li rau flange bolting, nozzle reinforcements, lossis kev txhawb nqa sab hauv- cov kev tsim khoom thiab kev tswj xyuas zoo yog tswj hwm los ntawm kev sib xyaw ntawm ASTM B348 (cov ntsiab lus hauv paus) thiab cov kev xav tau ntxiv ntawm ASME Boiler thiab Pressure V.
Kev xav txog kev tsim khoom:
Lub palladium ntxiv rau hauv GR11 yuav tsum tau ceev faj tswj thaum lub sij hawm melting kom ntseeg tau tias homogeneous tis. Lub alloy feem ntau yog tsim los sivVacuum arc remelting (VAR)los yogPlasma arc melting (PAM)cov txheej txheem, uas muab qhov tsim nyog tswj hwm chemistry thiab txo qhov kev pheej hmoo ntawm kev sib cais. Palladium, being a dense noble metal, must be uniformly distributed to avoid localized areas of either excessive or deficient palladium content.
Kev tswj hwm kev ua tau zoo rau cov ntawv thov ASME:
Cov ntaub ntawv pov thawj:Lub zeb yuav tsum tuav ibASME Certificate of Tso Caithiab tswj cov txheej txheem kom zoo raws li ASME Tshooj II, Ntu A. Txhua qhov khoom xa tuaj yuav tsum suav nrog cov ntawv pov thawjMaterial Test Report (MTR)Cov ntaub ntawv ua raws li ASTM B348 thiab cov khoom siv ASME (feem ntau SA-348).
Tshuaj ntsuam xyuas:Kev txheeb xyuas cov ntsiab lus palladium yog qhov tseem ceeb. MTR yuav tsum tshaj tawm cov kev soj ntsuam palladium, feem ntau 0.12-0.25%, thiab xyuas kom meej tias lwm cov ntsiab lus ua tau raws li cov kev txwv nruj ntawm GR1 nrog palladium ntxiv. Cov ntsiab lus oxygen yuav tsum tau tswj kom 0.18% siab tshaj plaws kom tswj tau cov yam ntxwv ductility ntawm GR1.
Tsis yog -kev kuaj kev puas tsuaj:Rau siab- khaws daim ntawv thov, 100%Kev kuaj ultrasonic (UT)feem ntau raug yuam kom kuaj xyuas qhov tsis zoo xws li voids, inclusions, lossis laminations. Kev ntsuam xyuas yog ua raws li ASME Tshooj V, nrog rau cov qauv kev lees paub feem ntau ua raws li tus qauv siv ncaj nraim - hauv qab qhov siv tus qauv.
Kev kho cua sov validation:GR11 tuav tau muab rau hauv qhov mob annealed. Cov txheej txheem annealing (feem ntau 650-760℃tom qab cua txias) yuav tsum tau sau tseg thiab siv tau los xyuas kom meej microstructure zoo ib yam thiab cov khoom. Kev ntsuam xyuas hardness feem ntau yog ua los xyuas qhov sib xws.
Traceability:Tag nrho traceability los ntawm ingot yaj mus rau lub tiav bar yog yuav tsum tau. Txhua lub bar yuav tsum tau cim nrog tus naj npawb cua sov, cov lus qhia tshwj xeeb, thiab qib, tso cai rau kev taug qab rov qab mus rau thawj daim ntawv pov thawj zeb.
Rau cov ntawv thov uas muaj qhov ntsuas kub siab, kev sim ntxiv xws li kev ntsuas kev ntxhov siab rupture los yog kev ntsuam xyuas creep tej zaum yuav raug teev kom paub tseeb tias kev ua tau zoo raws li kev thauj khoom ruaj khov.
5. Q: Yuav ua li cas lub formability, weldability, thiab machinability ntawm ASTM GR11 piv rau lwm yam titanium qib, thiab dab tsi fabrication xyaum yog pom zoo kom ua tau siab - cov khoom zoo?
A: ASTM GR11 tau txais txiaj ntsig zoo tshaj plaws ntawm kev tsim thiab weldability yam ntxwv ntawm nws qib qib, GR1, thaum muab kev txhim kho corrosion. Txawm li cas los xij, lub xub ntiag ntawm palladium qhia txog kev txiav txim siab me me rau kev tsim khoom uas yuav tsum tau hais kom ua tiav cov txiaj ntsig zoo.
Formability:
GR11 muaj qhov ua tau zoo tshaj plaws ntawm palladium- qib titanium ruaj khov. Nrog elongation feem ntau tshaj 24% thiab qis tawm los - mus rau - tensile piv, nws tuaj yeem txias - ua rau hauv cov duab tsis muaj cracking. Cov kev coj ua uas pom zoo rau kev tsim muaj xws li:
Siv dav dav khoov radii (feem ntau 2-3 zaug khoom thickness)
Siv cov kev ua haujlwm loj zuj zus rau kev deformations loj
Ua haujlwm nruab nrab ntawm kev ntxhov siab-relief annealing yog tias txo qis tshaj 50%
Zam kev tsim ntawm qhov kub qis dua 10℃los tiv thaiv kev txo qis ductility
Weldability:
GR11 nthuav dav weldability zoo, piv rau GR1. Qhov sib ntxiv ntawm palladium tsis cuam tshuam rau cov yam ntxwv weldability. Cov ntsiab lus tseem ceeb suav nrog:
Tiv thaiv:Titanium lub reactivity nrog oxygen, nitrogen, thiab hydrogen yuav tsum tau inert gas shielding (argon los yog helium) rau ob qho tib si lub pas dej ua ke thiab tshav kub - cuam tshuam cheeb tsam. Cov pa roj yuav tsum txuas mus rau sab nraub qaum ntawm qhov vuam kom puv - cov pob qij txha nkag.
Filler hlau xaiv:Kev sib txuam muab tub lim hlau (feem ntau AWS ERTi-11) tau pom zoo kom muaj kev tiv thaiv corrosion hauv thaj tsam weld. Nyob rau hauv ib puag ncig tsis nruj, ERTi-1 muab tub lim yuav siv tau, tab sis kev txhim kho kom txo cov kua qaub tiv thaiv ntawm GR11 yog qhov zoo tshaj plaws khaws cia nrog cov muab tub lim.
Weld xim:Ncej -weld discoloration (xiav, kub, lossis grey) qhia tias tsis muaj kev tiv thaiv zoo thiab tsis muaj oxygen. Cov xim zoo li no yuav tsum raug tshem tawm los ntawm kev siv tshuab lossis tshuaj lom neeg ua ntej cov khoom siv tau muab tso rau hauv kev pabcuam.
Ncej -weld kev kho cua sov:Feem ntau tsis tas yuav tsum tau rau GR11, tab sis tej zaum yuav raug teev rau kev ntxhov siab nyob rau hauv txoj kev weldments los yog kom rov qab tag nrho ductility tom qab ua hauj lwm txias.
Machineability:
GR11's machinability zoo ib yam li GR1, uas suav hais tias ncaj ncees rau cov qib titanium. Cov ntaub ntawv uas tsis tshua muaj thermal conductivity thiab nyiam ua hauj lwm harden yuav tsum tau tshwj xeeb machining xyaum:
Tooling:Ntsej muag, zoo-cov cuab yeej carbide nrog hnav- cov txheej txheem tiv thaiv (AlTiN lossis TiAlN) raug pom zoo
Coolant:High-siab coolant (70–100 bar) yog qhov tseem ceeb rau kev khiav tawm cov chips thiab dissipate cua sov
Speeds thiab feeds:Tsawg txiav ceev (30-60 m / min rau tig) nrog cov nqi pub ntau dua kom tsis txhob ua haujlwm hnyav
Chip tswj:Nruam stringy chips yog raug; chip breakers lossis interrupted txiav pab tswj kev tsim chip.
