1. Dab tsi yog cov yam ntxwv me me me ntawm 15 {}}}}}} 7mo thiab 654 ua ke ua ke ua ke ua ke ua haujlwm siab tawv?
Thaum ob qho tib si raug cais raws li stainless hlau, 15 {}}}}}}}}} _42) thiab 522) thiab ceg ntseeg ntawm cov ceg ntoo txawv teb chaws. Lawv tau muab pawg ua ke ua ke ua ke ua "siab -}}}} Kev ua tau zoo ntawm cov qauv 304 lossis 31 lub zog ua kom muaj zog thiab kev ua kom dhau los.
15 {-} 7mo (nag lossis daus-npau taws-harchening merensitic stainless hlau):
Metallurgy: cov tshuaj no belongs rau chav kawm paub raws li PH (nag lossis daus - hate hate. Nws cov chemistry (~ 15% cr, 7% ni, 2.5% mount, 1.2% al) yog tsim los nyob rau hauv lub xeev muag, workable martensitic xeev tom qab kho huab cua. Tus yuam sij rau nws lub zog yog cov ntsiab lus txhuas txhuas.
Muaj peev xwm ntxiv dag zog me ntsis: tom qab tau tsim rau hauv cov yeeb nkab lossis cov khoom siv, nws undergoes qhov kev kub ntxhov thaum laus "lossis" los nag li℃f / 510 degree). Thaum lub sijhawm cov txheej txheem no, cov khoom siv zoo heev intermetallic (feem ntau yog nyob ntawm Nial) precipitate uniformly thoob plaws lub martensitic martensic mart. Cov lus no zoo rau kev txav mus los ntawm kev tsis sib haum, ua rau muaj kev nce siab nyob rau hauv lub zog thiab hardness thaum khaws cov txiaj ntsig muaj txiaj ntsig muaj txiaj ntsig.
654 Smo (Super - ustenitic stainless hlau):
Metallurgy: Qhov no yog super -}}}}}}}}}}}}}} }្stain lattice) zoo li 316, tab sis nws cov ntsiab lus alloy yog vastly txhim kho. Nws cov lus tseem ceeb tshaj plaws yog nws qhov kev xaiv siab tshaj plaws sib npaug (pren {}}} x% w) {6} x% n). Nrog ~ 24% CR, 7.5% MO, thiab 0.5% n, nws pren tshaj 55, tso nws nyob rau sab saum toj ntawm cov kab mob stainless hlau tsis kam ua.
Muaj peev xwm ntxiv dag zog rau lub zog: nws lub zog los ntawm cov khoom {{0} istort haloysing, uas nids ua kom muaj zog tshaj tawm, uas nce ntau zog ntawm cov qauv Austenitics. Nws tsis yog cua sov - kho tau zoo li 15 -}}}}}}}}}}}}} ineealed mob.
2. Nyob rau hauv uas xav tau cov ntawv thov yog kav dej ua los ntawm ob qhov tshwj xeeb tshaj plaws?
Qhov kev xaiv ntawm 15-7Mo thiab 654 smo yog dictated los ntawm thawj qhov kev hem thawj hauv daim ntawv thov: kev ntxhov siab lossis kev tawm tsam corrosive.
15-7MO PRICS DAIM NTAWV THOV:
Aerospace thiab defense: Qhov no yog nws thawj qhov kev ua haujlwm hauv lub zog, thiab cov khoom muaj zog} Lub peev xwm los tsim thiab machined nyob rau hauv lub xeev mos thiab tom qab ntawd tawv tom qab fabrication yog qhov zoo dua.
High - kev ntsuas siab: lub tsev nyob, thiab cov khoom siv tshuaj lom neeg ua rau cov nroj tsuag uas muaj tshuaj lom neeg.
Nuclear Reactor Cheebtsam: qee yam cuab tam thiab tswj cov lus qhia kev muaj zog uas muaj zog thiab muaj mob corrosion tsis kam.
654 SMO YEEB MAB THOV:
Tsis tshua muaj cov tshuaj lom neeg ua: Qhov no yog cov khoom siv ntawm kev xaiv thaum tseem muaj kev xaiv zoo li Hastelloy c-}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} Nws yog siv rau cov raj roj piping concentrated sulfuric acid, kub chloride {{5 5}} Cov kua tshuaj sib xyaw (piv txwv li kev cai ua kom nruj
Cov dej hiav txwv thiab ntug dej hiav txwv: rau cov dej khov, thiab cov pa dej siab, tshwj xeeb tshaj yog nyob rau qhov chaw sov, tshwj xeeb yog cov kev pheej hmoo ntawm kev pheej hmoo.
Flue Gas Desulfurization (FGD) Chav Nyob: Hauv cov chaw uas muaj cov pa roj corrosive (qhov hluav taws xob, ua kom cov pa dej, thiab cov sulfuric acid tam sim no.
Pollution Control and Wastewater Treatment: For piping that handles highly oxidizing, halogen-contaminated process streams.
3. Dab tsi yog qhov tseem ceeb fabrication thiab vuam cov kev sib tw txuam nrog cov alloys?
Fabricating no cov siab -}} ession alloys yuav tsum tau txais lawv cov peev txheej tshwj xeeb.
15-7Mo Fabrication thiab Vuam:
Txoj kev sib sau: Txhua txoj kev sib sau, khoov, thiab machin yuav tsum tau ua hauv "mob {{{{{{{{} Nrhiav) lub xeev, qhov twg cov khoom siv mos thiab du.
Kev kho cua sov: tom qab fabrication, tag nrho cov undergoes undergoes ob {}}℃f / 510℃rau kev ua kom muaj zog ntawm kev xav tau. Precise kub kev tswj yog qhov tseem ceeb.
Vuam: Nws yog yooj yim welded siv cov matching muaj pes tsawg tus muab tub rog (piv txwv li, er630) lossis nickel . rated fille. Tag nrho cov weldment tag nrho yuav tsum tau rov ua} Kev daws cov khoom siv thiab cov neeg ua haujlwm ntawm Weld kom rov muaj lub hauv paus hlau, cua sov}} be} cuam tshuam cheeb tsam (Haz), thiab weld hlau. Cov kev kho cua sov feem ntau ua rau distortion thiab cov cuab yeej muaj npe.
654 Smo Fabrication thiab Vuam:
Txoj kev sib sau: Nws muaj lub zog dua thiab ua haujlwm -} puas muaj zog dua li cov qauv Austenitics. Cov khoom siv muaj zog thiab cov kauj ruam nruab nrab hauv nruab nrab yuav tsum tau rau cov tuab tuab- phab ntsa yeeb nkab yeeb nkab.
Vuam: Txoj kev sib tw zoo tshaj plaws yog khaws cia cov xeb ntawd tiv thaiv ntawm cov weldment.
Muab tub lim hlau: ib qho super - {{{{1ni alloy los yog ntau dua}
Thaum tshav kub kub thiab cov tswv yim sib txuam: kev tswj nruj yog qhov tsim nyog. Tsawg tsawg cua sov tawm thiab interpass qhov kub siab hauv qab no 100 degree}}} theem, uas yuav dhuav thiab corrosion tsis kam.
Rov qab ntxuav cov: Tag nrho Argon rov qab ntxuav tawm yog yuav tsum tau tiv thaiv oxidation thiab qab zib rau hauv paus sab, uas tuaj yeem dhau los pib cov ntsiab lus rau kev xeb.
4. Yuav ua li cas cov neeg kho tshuab thiab corrosion thaj chaw ntawm 15-7
Lawv nyob ib qho kev ua haujlwm theem ua kom tiav dua cov ntaub ntawv.
| Ntiag tug | 316L Austenicic | 2205 Duplex | 15-7Mo Ph | 654 smo |
|---|---|---|---|---|
| Paib lub zog | ~ 30 Ksi (205 MPa) | ~ 65 Ksi (450 MPa) | Txog li 220 KSI (1515 MPA) | ~ 55 Ksi (380 MPa) |
| Pren (corrosion) | ~26 | ~35 | ~19 | >55 |
| Tseem ceeb lub zog | Formancion, Vuam | Lub zog / Corrosion Tshuav | Ultra - lub zog siab | Qhov Kawg Corrosion Kuj |
| Qhov tseem ceeb tsis muaj zog | Tsawg lub zog, cl - pitting | Haz Theem Los nag | Yuav tsum tau tshaj tawm -} weld ht | Tus nqi, Fabrication nyuaj |
15 {-}} 7mo vs {}} l / 2205: 15}} l / 2205. Txawm li cas los xij, pren ~ 19) yog qis dua rau ob qho tib si. Nws yog tus kws tshaj lij rau lub zog - qhov tseem ceeb, nruab nrab-corrosion daim ntawv thov.
654 Smo vs . 316 l / 2205: 654 smo corrosion intigerance, yog nyob rau hauv txawv txav zoo tag nrho. Nws tuaj yeem tiv thaiv cov xwm txheej uas yuav ua rau rhuav tshem 316L thiab yuav twv 2205. Nws lub zog tseem yog siab dua 316L's.
5. Dab tsi tshwj xeeb tswj thiab kev sim cov kev cai tsis - sib yeem ntawm cov kav dej?
Muab lawv cov ntawv thov tseem ceeb thiab tus nqi siab, QC yog qhov tshwj tsis yog nruj.
Rau ob qho alloys:
Tshuaj Kev Ntsuam Xyuas Tshuaj: CMTRS) nrog cov ntaub ntawv pov thawj ntawm icp - oes lossis xrf.
Kev Kuaj Me: Tensile thiab Hardness Xyuas kom pom tseeb lub zog ua tau lub zog (piv txwv li, H950 rau 15-7Mo, Annealed rau 654 smo).
Tsis - Kev Kuaj (NDT): 100% Ultrasonic Testing (UT) rau sab hauv kev sim (PT) rau qhov tsis xws luag. Tag nrho - ntev chanchaw kev xeem (RT) yog qauv rau welded kav dej.
Alloy -} Tshwj xeeb QC:
Rau 15-7mo:
Corrosion Kuaj: Thaum tsis yog nws thawj qhov tshwj xeeb, intergranular corrosion kev sim ib astm A262, Xyaum E yuav tau hais kom meej txog kev kho cua sov.
Kev ntsuam xyuas microscination: Kev pov thawj ntawm cov qauv sib tw martensitic nrog tsis muaj kev cuam tshuam lossis tshaj {{{authenitization.
Rau 654 SMO:
Corrosion Testing: This is paramount. ASTM G48 Method A (Ferric Chloride Pitting Test) is standard. Pipes must demonstrate a Critical Pitting Temperature (CPT) of >95℃(203 Degree F) kom paub meej tias lawv tus nqi hwm.
Kev ntsuam xyuas microscination: ASTM I923 Txuj Ci C (Charpy Kev Kuaj Kev Ntsuas) yog siv los tshawb xyuas cov theem cuam tshuam kev cuam tshuam thiab xeb tsis ua haujlwm. Yuav tsum muaj kev cuam tshuam rau lub zog muaj zog.
Huey kuaj: rau kev thov hauv nitric acid, astm A262 kev coj ua C (Huey sim) ntsuas tsis cuam tshuam rau kev sib cav sib ceg.
Qhov no QC ua kom tau kom meej tias cov siab -} tus nqi kav ua rau muaj kev ntseeg siab rau cov.
