Hastelloy alloy tshwj xeeb cov khoom siv thiab kev taw qhia
I. Kev Taw Qhia
Hastelloy yog ib hom nickel-based alloy. Nws yog tam sim no muab faib ua peb series: B, C, thiab G. Nws yog tsuas yog siv rau corrosion muaj zog uas tsis tuaj yeem siv hlau-raws li Cr-Ni los yog Cr-Ni-Mo stainless hlau, cov khoom tsis yog xim hlau, thiab lwm yam. tau siv dav hauv roj av, tshuaj lom neeg kev lag luam, kev tiv thaiv ib puag ncig thiab ntau lwm qhov chaw txawv teb chaws.
Txhawm rau txhim kho corrosion kuj thiab txias thiab kub ua haujlwm ntawm Hastelloy, Hastelloy tau ua peb qhov kev txhim kho loj. Txoj kev txhim kho yog raws li nram no:
B series: B → B-2(00Ni70Mo28) → B-3
C series: C → C-276(00Cr16Mo16W4) → C-4(00Cr16Mo16) → C-22 (00Cr22Mo13W3) → C-2000(00Cr20Mo16)
G series: G → G-3 (00Cr22Ni48Mo7Cu) → G-30 (00Cr30Ni48Mo7Cu)
Cov ntaub ntawv siv dav tshaj plaws tam sim no yog N10665 (B-2), N10276 (C-276), N06022 (C-22), N06455 (C-4) thiab N06985 ( G-3). Cov khoom siv tiam thib peb N10675 (B-3), N10629 (B-4), thiab N06059 (C-59) yog nyob rau theem nce qib. Vim tias kev nce qib ntawm kev siv tshuab metallurgical, ntau lub npe hu ua "super stainless hlau" uas muaj ~ 6% Mo tau tshwm sim nyob rau xyoo tas los no, hloov G series alloys, ua rau poob sai hauv kev tsim khoom thiab siv G series alloys.
Kev tsim khoom thiab kev kho cua sov
1: Cua sov Rau Hastelloy B-2 alloy, nws yog ib qho tseem ceeb heev uas yuav tsum ua kom lub ntsej muag huv si thiab deb ntawm cov kab mob ua ntej thiab thaum lub sij hawm cua sov. Hastelloy B-2 alloy yuav nkig yog rhuab nyob rau hauv ib puag ncig uas muaj leej faj, phosphorus, txhuas los yog lwm yam tsawg melting point hlau paug. Lub hauv paus ntsiab lus ntawm cov kab mob no muaj xws li cov cim cim, qhov kub thiab txias qhia cov xim, roj thiab kua, haus luam yeeb. Cov pa roj no yuav tsum muaj cov sulfur tsawg; Piv txwv li: cov sulfur cov ntsiab lus ntawm cov roj av thiab cov roj liquefied roj av tsis pub tshaj 0.1%, cov ntsiab lus sulfur hauv nroog huab cua tsis tshaj 0.25g / m3, thiab cov ntsiab lus ntawm cov roj sulfur roj tsis tshaj 0.5% yog tsim nyog. Cov roj ib puag ncig ntawm lub qhov cub cua sov yuav tsum yog qhov nruab nrab ib puag ncig lossis ib puag ncig txo qis, thiab nws tsis tuaj yeem hloov pauv ntawm oxidizing thiab txo. Cov nplaim taws hauv qhov cub tsis tuaj yeem cuam tshuam ncaj qha rau Hastelloy B-2 alloy. Nyob rau tib lub sijhawm, cov khoom siv yuav tsum tau rhuab mus rau qhov ntsuas kub uas yuav tsum tau ua ntawm qhov cua kub ceev tshaj plaws, uas txhais tau hais tias qhov kub ntawm lub qhov cub cua sov yuav tsum tau nce mus rau qhov kub thiab txias, thiab tom qab ntawd cov khoom yuav tsum tau muab tso rau hauv qhov cub kom sov. .
2: Kub ua: Hastelloy B-2 alloy tuaj yeem ua haujlwm kub ntawm 900 ~ 1160 degree, thiab yuav tsum tau quenched nrog dej tom qab ua tiav. Txhawm rau kom ntseeg tau qhov zoo tshaj plaws corrosion kuj, annealing yuav tsum tau ua tom qab ua haujlwm kub.
3: Ua haujlwm txias. Cold-ua hauj lwm Hastelloy B-2 alloy yuav tsum tau txais kev kho kom zoo. Txij li nws muaj ntau dua kev ua haujlwm hardening ntau dua li austenitic stainless hlau, cov cuab yeej tsim yuav tsum tau ua tib zoo xav. Yog tias qhov txheej txheem txias txias tau ua tiav, interstage annealing yog tsim nyog. Thaum qhov kev ua haujlwm txias deformation ntau dua 15%, kev kho tshuaj yuav tsum tau ua ua ntej siv.
4: Kev kho cua sov: Cov khoom siv hluav taws xob kho cua sov yuav tsum tau tswj ntawm 1060 ~ 1080 degree, ua raws li cov dej txias txias los yog cua txias sai thaum cov khoom thickness ntau tshaj 1.5 hli kom tau qhov zoo tshaj plaws corrosion kuj. Thaum lub sijhawm ua haujlwm cua sov, yuav tsum tau ceev faj kom huv si saum npoo ntawm cov khoom. Cov teeb meem hauv qab no yuav tsum tau them sai sai rau thaum kho cua sov ntawm Hastelloy cov ntaub ntawv lossis cov khoom siv: Txhawm rau tiv thaiv kev kho cua sov deformation ntawm cov khoom siv, cov hlau tsis muaj steel hlau yuav tsum tau siv; lub cub tawg loading kub, cua sov thiab txias lub sij hawm yuav tsum tau nruj me ntsis tswj; ua ntej thauj khoom rau lub qhov cub, qhov chaw kho cua sov ua ntej kev kho mob yog nqa tawm los tiv thaiv qhov tshwm sim ntawm thermal tawg; Tom qab kev kho cua sov, qhov chaw kho cua sov yog 100% PT; Yog hais tias thermal tawg tshwm sim thaum lub sij hawm kho cua sov txheej txheem thiab yuav tsum tau kho tom qab polished thiab tshem tawm, yuav tsum tau siv tshwj xeeb kho vuam txheej txheem.
5: Descaling: Cov oxides nyob rau saum npoo ntawm Hastelloy B-2 alloy thiab cov stains nyob ze cov welds yuav tsum tau polished nrog ib tug zoo sib tsoo log. Txij li Hastelloy B-2 alloy yog qhov rhiab heev rau oxidizing media, ntau nitrogen-muaj roj yuav raug tsim thaum lub sij hawm pickling.
6: Lub machining ntawm Hastelloy B-2 alloy yuav tsum tau ua nyob rau hauv lub xeev annealed, thiab kev nkag siab meej ntawm nws cov hauj lwm hardening yuav tsum tau ua tiav. Piv txwv li, piv nrog tus qauv austenitic stainless hlau, yuav tsum tau siv qhov kev txiav qeeb qeeb. Cov txheej tawv tawv yuav tsum siv cov khoom noj loj dua thiab ua kom lub cuab yeej ua haujlwm tsis tu ncua.
7: Lub vuam hlau thiab tshav kub cuam tshuam ntawm Hastelloy B-2 alloy yog nquag los nag lossis daus ntawm theem, ua rau Mo depletion, uas yog feem ntau cuam tshuam rau intergranular corrosion. Yog li ntawd, cov txheej txheem vuam ntawm Hastelloy B-2 alloy yuav tsum tau ua tib zoo tsim thiab tswj nruj me ntsis. . Cov txheej txheem vuam dav dav yog raws li hauv qab no: cov khoom siv vuam yog ERNi-Mo7; txoj kev vuam yog GTAW; lub interlayer kub yog tswj kom tsis txhob ntau tshaj 120 degree; welding hlau txoj kab uas hla yog φ2.4, φ3.2; welding tam sim no yog 90 ~ 150A. Nyob rau tib lub sijhawm, ua ntej welding, vuam hlau, qhov zawj ntawm qhov chaw welded thiab qhov chaw nyob ib sab yuav tsum decontaminated thiab degreased. Lub thermal conductivity ntawm Hastelloy B-2 alloy yog tsawg dua li ntawm cov hlau. Yog tias ib qho V-shaped zawj raug xaiv, qhov zawj lub kaum sab xis yuav tsum yog li 70 degree, thiab cov khoom siv hluav taws xob qis yuav tsum tau siv. Kev kho cua sov tom qab vuam tuaj yeem tshem tawm qhov kev ntxhov siab seem thiab txhim kho kev ntxhov siab corrosion cracking tsis kam.
