ASTM A213 T9 Alloy Steel Tubing

Libanka tse kholo, li-reheater circuits, HRSG convection sections le heater coil face tube-metal heats and oxidation loads tse fetang-Cr alloys. ASTM A213 T9 e fana ka matla a phahameng a chesang le boitšoaro bo tsitsitseng ho feta limaraka tsa 1.25–2.25Cr ntle le kutloisiso ea maiketsetso ea litšepe tsa 9Cr–V-Nb, e leng se etsang hore e be khetho e sebetsang moo lihora tse telele, li-gradients tsa mocheso le botšepehi ba li-coil li laolang kotsi.

ASTM A213/SA213 e hlalosa tšepe e se nang seamless-tubingbakeng sa li-boilers le li-heaters tsa mocheso. Merero e hlakisa bophara ba kantle, lebota le tlase le bolelele bo sehiloeng ka kotloloho ho database ho fapana le linako tsa liphaephe. Ho otloloha le ovality hangata li tiisitsoe bakeng sa tube-ho{3}}tubesheet fit; liphetho li fanoa ka mokhoa o hlakileng kapa o sekoere{4}likhoebo bakeng sa ho cheseletsa lintho tse itseng, ka li-bevel feela moo ho reriloeng ho cheselletsa butt.

Letlapa 1 - A213 T9 sebopeho sa lik'hemik'hale (wt.%)

Lethathamo 2 - Bonyane ba thepa bakeng sa tlhahlobo

Moralo o sebelisa likhatello tse lumelletsoeng mochesong oa ts'ebetso ho tsoa ho khoutu e laolang.

Tshebetso e laoloa kemocheso oa tšepe, ho qala-maqhubu a ho emisa le ho boloka bokaholimoho sebetsa mmoho. Ka ~ 9% Cr, oxidation e atisa ho latelamolao oa parabolic(oxide{0}}botenya² ≈ k·nako); sekhahla sa parabolic se tlase haholo ho feta ka tlase-Cr steels, e fokotsang botenya ba sekala le liketsahalo tsa spallation. Mo e tsitsisa li-carbides, e liehisa lijo-thollo-ho thella ha moeli le ho hola ha lerako e le hore tahlehelo ea nako{4}e fokotsehe butle.

Hoho chesa, likarolo tse omeletsengjoalo ka li-circuits tse chesang-le libanka tse tsamaisang hitara, T9 e boloka chitja le botenya ba lebota ho feta likhetho tsa 1.25–2.25Cr, e fokotsa maqhubu a retube le litšila tse bakoang ke sekala sa shed. Mosebetsing oa HRSG ka ho palama libaesekele khafetsa, mocheso oa mocheso o phahamisa khatello ea oxide le ho eketsa ho phatloha/"re{5}}oxidation"; ho leka-lekanya lireiti, ho ntlafatsa ho butsoa ha mosili{6}, le ho latedisatube{0}}mocheso oa tšepe (TMT)libaka tse hotspots ka lintho tse bonahalang fokotsa kotsi. Deposit chemistry ea bohlokoa: alkali-e humileng kapa sebabole-e behang molora e ka fetola oxide le ho potlakisa tlhaselo ea lehae, kahoo tlhahlobo ea mafura / molora hammoho le tlhahlobo ea borescope e sebelisoa ho rera ho hloekisa le ho hlahloba linako.

Bakeng sa creep, molemo oa T9 o lutse hosebaka sa bophelo bo bolelele-: e ntle, e sa khaotseng-ea marang-rang ea carbide ho tloha mocheso o nepahetseng o ntlafatsa nako ea ho phatloha le ho boloka ho fetoha ha sebopeho. Mocheso o fetelletseng kapa o sa sebetseng{2}o sa laoleheng o futhumatsa lijo-thollo le ho spheroidizes carbides, e etsa hore ho be le maqhubu a pele, ovality kapa ho lutla. Ka ts'ebetso, e ntse e tsoela pelebotenya ba oxide/ boima ba mmelehammoho le nalane ea TMT e fana ka motheo oa bopaki bakeng sa kemiso ea tlhahlobo.

Lethathamo 3 - Letšoao la lebaleng khahlano le karabo ea boenjiniere

Tafole 4 - Enfelopo e tloaelehileng ea boholo

Boemo ba sefahleho hangata bo etsa qeto ea bophelo bohle ba mosebetsi o chesang. Loop e sebetsang ea taolo ke:de-scale → hloekisa → omella → cap → thatela → netefatsa. Kamora ho theha, tlosa tint ea mocheso le sekala se setseng ho ID / OD; Hlakola ka mecha ea litaba e hloekileng, ebe o omisa ID ho sepheo se ngotsoeng (mohlala, phoka ka tlase ho sebaka se haufi le moeli o hlalositsoeng). Fitlikatiba tse thata'me u sebelise tšireletso e sireletsang e hanela lerōle le mongobo; boloka dingata fatše ka drainage le tšireletso ea UV.

Kamohelo ke ea ITP kahoo QA e ka saena ntle le ngangisano. Hlalosa hore na "hloekile" e bolela eng (sehlopha sa pono, meeli ea chloride/oli haeba ho hlokahala), hore na ho omella ho hlahlojoa joang, le hore na ho hlokahala sephuthelo sefe bakeng sa boemo ba leholimo ba polokelo. Boloka lithulusi tsa carbon-hole le liphaephe tsa T9 ho thibela ho kenya{4}aena ho kenya tšepe mahala; moo mabenkele a kopaneng a ke keng a qojoa, tsamaisa poso-hloekisatlhahlobo ea ferroxylka mehlala. Pele o lokolloa, rekota linepe 'me u kopanye lethathamo la polokelo le ID ea bongata e le hore basebetsi ba kenyang ba tsebe hore mohala ha oa silafatsoa polokelong.

Bakeng sa merero e shebaneng le ASTM A213 T9,Pipe ea Octale fana ka li-tubing tse se nang moeli, e hokahanya mekhoa le litokomane le morero oa ITP, 'me e ka hlophisa bopaki bo ikemetseng (mohlala, BV, SGS) ha ho hlokahala.

Q1: Tubing ea ASTM A213 T9 (ASME SA213 T9) e sebelisetsoa eng?
A1:Seamless 9Cr-1Mo ferritic alloy tubing bakeng sa liboiler, lihiathara tse kholo, le li-heaters tse futhumatsang{3}litšebeletso tse phahameng haholo.

Q2: Na A213 T9 e lekana le A335 P9?
A2:Hangata li ts'oaroa joalo ka chemistry/UNS (T9=tubing spec, P9=pipe spec), empa u lokela ho bapisa maemo a hlokahalang a projeke le boholo ba tlhahlobo.

Q3: Ke kopa eng ho netefatsa boleng ba tubing ea ASTM A213 T9 pele ke reka?
A3:3.1 MTC e nang le nomoro ea mocheso + boemo ba phekolo ea mocheso, liphello tsa k'hemistri / mechine, hydrotest kapa NDE (joalokaha ho boletsoe), licheke tsa dimensional, le ho tšoaea ka ho feletseng / traceability.

Ikopanye hona joale

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