1: Hastelloy UNS N10665 yog dab tsi, thiab dab tsi yog cov yam ntxwv ntawm nws daim ntawv puag ncig?
Hastelloy UNS N10665, kev lag luam hu ua Hastelloy B-2, yog nickel-molybdenum alloy tshwj xeeb tsim los rau tshwj xeeb tiv thaiv kom tsis txhob muaj kev cuam tshuam ib puag ncig. Nws cov nominal muaj pes tsawg leeg yog kwv yees li 65% npib tsib xee thiab 28% molybdenum, nrog tsawg tsawg ntawm carbon, chromium, thiab hlau. Qhov kev txiav txim siab chemistry no ua rau nws muaj kev tiv thaiv zoo rau kev tsim ntawm cov ciam teb carbides thiab theem intermetallic, hais txog cov teeb meem weld lwj ntawm nws cov thawj, Hastelloy B.
Daim ntawv puag ncig ntawm Hastelloy B-2 yog ntau yam, cov khoom lag luam tau tsim los ntawm kev sib xyaw ua ke ntawm kub forging, kub dov, thiab feem ntau qhov kawg txias tiav. Cov yam ntxwv tseem ceeb ntawm round bar muaj xws li:
Homogeneous, Wrought Structure: Cov txheej txheem ua haujlwm kub ua rau cov txheej txheem cam khwb cia ntawm lub ingot, tsim kom muaj ib qho zoo, zoo -grained microstructure uas ua kom cov khoom zoo ib yam thiab corrosion kuj thoob plaws hauv tus ntoo khaub lig- ntu ntawm lub bar.
Siab zog thiab machinability: Nyob rau hauv lub annealed mob, B-2 round tuav muaj ib tug zoo tshuav nyiaj li cas ntawm lub zog thiab ductility, cia lawv yuav tsum machined rau hauv complex Cheebtsam xws li valve stems, twj tso kua mis shafts, thiab fasteners.
Precision thiab Surface Quality: Txias- kos los yog tig tuav muab qhov zoo tshaj plaws qhov tseeb (cov kab ci ntsa iab), lub ntsej muag du, thiab nruj kam rau ua, uas yog qhov zoo tagnrho rau kev kaw - kev ua haujlwm siab ntev thiab siv ncaj qha raws li shafts lossis pins.
Material Integrity: Raws li cov khoom lag luam, cov kab puag ncig tsis pub dawb los ntawm qhov tsis xws luag sab hauv uas qee zaum tuaj yeem tshwm sim hauv cov khoom hollow xws li cov kav dej, ua rau lawv ntseeg siab rau siab - kev siv kev ntxhov siab.
2: Nyob rau hauv cov ntaub ntawv siv tshuaj lom neeg hnyav yog Hastelloy B-2 Round Bars suav tias yog cov khoom xaiv?
Hastelloy B-2 puag ncig tuav tau teev tseg rau cov khoom siv uas yuav tsum tau tiv taus qhov hnyav tshaj plaws txo cov kua qaub, tshwj xeeb tshaj yog qhov muaj zog, hnav tsis kam, thiab qhov ruaj khov ntawm qhov yuav tsum tau muaj nyob rau hauv corrosive nres. Lawv daim ntawv thov feem ntau yog rau qhov tseem ceeb rotating lossis static Cheebtsam hauv cov txheej txheem khoom.
Cov ntawv thov tseem ceeb suav nrog:
Kev Pabcuam Hydrochloric Acid: Qhov no yog daim ntawv thov tseem ceeb. B-2 yog ib qho ntawm ob peb cov alloys uas tuaj yeem tswj tau tag nrho cov concentrations ntawm HCl ntawm qhov kub thiab txias mus txog qhov kub kub. Round bars yog machined rau hauv:
Agitator shafts thiab impeller hubs hauv HCl reactors thiab cia tso tsheb hlau luam.
Cov twj tso kua mis, lub tes tsho, thiab hnav cov nplhaib hauv cov twj siv tshuaj lom neeg hnyav heev.
Valve stems, rooj vag, thiab pob rau HCl tuav li qub.
Sulfuric Acid Processing: Rau kev tuav cov concentrated, tsis yog -oxidizing sulfuric acid ntawm nruab nrab kub, B-2 Cheebtsam muab lub neej zoo dua piv rau cov qauv stainless hlau.
Acetic Acid thiab Anhydride Ntau Lawm: Qhov tseem ceeb rau cov khoom siv sab hauv hauv cov tshuaj tiv thaiv thiab cov kab mob distillation qhov kub, glacial acetic acid tam sim no.
Alkylation thiab Catalyst Support Systems: Hauv cov txheej txheem siv cov kua qaub muaj zog (piv txwv li, HF lossis H₂SO₄ alkylation), B-2 yog siv rau sab hauv, txhawb nqa daim phiaj, thiab fasteners.
General Fasteners thiab Hardware: Studs, bolts, txiv ntseej, thiab dowel pins rau kev sib dhos cov txheej txheem cov khoom siv uas yuav ua haujlwm nyob rau hauv cov kev ua phem no, kom ntseeg tau tias tag nrho cov kev sib dhos muaj kev tiv thaiv corrosion.
3: Dab tsi yog qhov tseem ceeb machining thiab kev kho cua sov cov txheej txheem rau fabricating Cheebtsam ntawm Hastelloy B-2 Round Bars?
Kev ua tiav machining thiab kev kho cua sov ntawm Hastelloy B-2 yuav tsum muaj cov txheej txheem tshwj xeeb los tswj nws cov kev tiv thaiv corrosion thiab cov khoom siv kho tshuab.
Machining Guidelines:
Ua Haujlwm Hardening: B-2 muaj lub siab xav ua haujlwm hnyav. Machining cov tswv yim yuav tsum tsis txhob cia lub cuab yeej rub tawm ntawm lub workpiece.
Tooling: Siv tsuas yog ntse, zoo -rake lub kaum sab xis cov cuab yeej ua los ntawm premium carbide los yog siab -speed steel (HSS). Kev teeb tsa nruj thiab tshuab yog qhov tseem ceeb los tiv thaiv kev sib tham.
Txiav Tsis Siv Neeg: Siv qis mus rau nruab nrab ceev, siab pub tus nqi, thiab qhov tob txaus ntawm kev txiav. Lub teeb, kev txiav tiav yuav ua haujlwm- ua kom lub ntsej muag tawv, ua rau cov cuab yeej nyuaj thiab nrawm nrawm dua. Lub hom phiaj yog txiav hauv qab qhov chaw ua haujlwm - txheej tawv tawv los ntawm kev dhau dhau los.
Coolant: Siv cov khoom hnyav-lub luag haujlwm, sulfur- dej dawb-soluble coolant nyob rau hauv lub ntim siab kom dissipate tshav kub thiab yaug chips.
Kev kho cua sov:
Kev daws Annealing: B-2 puag ncig bar yog nkag rau hauv cov tshuaj -annealed mob (rhuab mus rau ~ 1065℃/ 1950℃F thiab dej quenched). Qhov no yog qhov muag, zas, thiab corrosion feem ntau-lub xeev tiv taus. Txhua yam kev ua haujlwm txias txias (xws li, khoov hnyav, tshuab ua haujlwm uas ua rau muaj kev ntxhov siab) yuav tsum tau ua raws li kev rov ua kom rov zoo dua qub.
Tus nqi cua txias tseem ceeb: Cov dej quench tom qab annealing tsis yog -negotiable. Kev txias qeeb los ntawm qhov kub ntawm 550-850℃(1020-1560℃F) tuaj yeem ua rau nag lossis daus, intermetallic Ni₄Mo thiab Ni₃Mo theem, uas ua rau txo qis ductility thiab corrosion kuj. Qhov no embrittlement yog irreversible.
Kev Tiv Thaiv Kev Nyuaj Siab: B-2 tsis yog nag lossis daus-hardenable alloy. "Stress relieving" ntawm qhov nruab nrab qhov kub thiab txias feem ntau tsis pom zoo vim tias muaj kev pheej hmoo siab los nag lossis daus. Tib txoj kev nyab xeeb los daws kev ntxhov siab los ntawm machining yog kev daws teeb meem tag nrho thiab quench.
4: Yuav ua li cas metallurgical stability ntawm Hastelloy B-2 cuam tshuam rau lub sij hawm ntev - kev ua tau zoo ntawm cov khoom ua los ntawm cov kab tuav nyob rau hauv high-temperature service?
Lub sijhawm ntev - kev ua tau zoo ntawm Hastelloy B-2 cov khoom sib dhos tag nrho ntawm kev tswj hwm nws ib zaug -theem, khoom- daws teeb meem microstructure. Nws metallurgical stability yog ob-edged ntaj.
Qhov Zoo - Kev Ua Phem Rau Kev Ruaj Ntseg: Tsis zoo li ntau cov hlau tsis zoo, B-2 cov ntsiab lus qis heev (<0.02%) makes it immune to chromium carbide precipitation and associated intergranular corrosion (sensitization) during welding or high-temperature exposure. This is a major advantage for fabricating welded structures from bar stock.
Qhov Kev Sib Tw Tseem Ceeb - Nruab Nrab Kub Kub Embrittlement: Cov hlau tsis muaj zog yog nws cov thermodynamic nyiam kom nws cov nickel thiab molybdenum atoms rau hauv cov sib txuas sib txuas (Ni₄Mo, Ni₃Mo) thaum tuav hauv qhov kub ntawm kwv yees li 550-850℃(1020-1560℃F). Qhov no suav nrog ob qhov kev pabcuam ntev ntev thiab, qhov tseem ceeb, qeeb txias los ntawm qhov ntau yam tom qab annealing lossis vuam.
Impact rau Cheebtsam:
Embrittlement: nag lossis daus ntawm cov theem no ua rau muaj kev puas tsuaj loj ntawm cov ductility thiab cuam tshuam lub zog. Ib tug ncej los yog fastener yuav ua tsis tau raws li nkig nyob rau hauv kev poob siab load.
Txo Corrosion Resistance: Cov molybdenum{0}}depleted thaj chaw nyob ib ncig ntawm cov nag lossis daus los ua anodic thiab muaj kev cuam tshuam rau hauv cheeb tsam, tshwj xeeb hauv HCl kev pabcuam.
Qhov cuam tshuam rau Kev Tsim: Cov khoom tsim los ntawm B-2 puag ncig yuav tsum tsis txhob tsim kom ntev - kev pabcuam txuas mus ntxiv nyob rau hauv qhov ntsuas kub tseem ceeb no. Lawv yog qhov zoo tshaj plaws rau kev pabcuam kub kub uas lawv tau nrawm nrawm thaum kaw, lossis rau kev pabcuam hauv qab ~ 550 degree.
5: Dab tsi yog cov qauv kev qhia tshwj xeeb, kev kuaj xyuas zoo, thiab cov ntaub ntawv xav tau rau kev muab Hastelloy B-2 Round Bars rau kev pabcuam tseem ceeb?
Kev yuav khoom ntawm Hastelloy B-2 puag ncig bar rau cov txheej txheem tshuaj thov kom ua raws li cov qauv nruj thiab cov ntaub ntawv zoo.
Thawj Tswj Hwm Specifications:
ASTM B335: Txheem Specification rau Nickel-Molybdenum Alloy (UNS N10001, N10665, N10675) Qws thiab Bar.
ASME SB-335: Sib npaug qhov tshwj xeeb rau lub nkoj siab thiab kev siv nuclear.
AMS 7701: Aerospace Khoom Specification rau brazing alloy, tab sis muaj feem xyuam rau siab -purity bar Tshuag.
Yuav tsum tau xeem kom zoo:
Tshuaj ntsuam xyuas: Kev txheeb xyuas qhov ultra- carbon qis (<0.02%), controlled iron, and precise Ni/Mo balance via optical emission spectrometry. This is the most critical test.
Mechanical Testing: Tensile zog, yield zog, elongation, thiab hardness kuaj nyob rau hauv chav tsev kub kom paub meej tias tus mob annealed.
Corrosion Test (feem ntau Specified): ASTM G28 Txoj Kev A tsis haum rau qhov no txo alloy. Hloov chaw, kev ntsuas kub ntawm hydrochloric acid (piv txwv li, raug rau 20% HCl ntawm qhov kub thiab txias rau lub sijhawm tshwj xeeb) yuav tsum tau ua kom muaj kev tiv thaiv corrosion, nrog rau qhov hnyav tshaj qhov hnyav.
Microstructural Examination: Txhawm rau txheeb xyuas qhov tsis muaj cov theem ob thiab paub meej tias muaj cov txheej txheem recrystallized tag nrho, equiaxed grain qauv.
Cov ntaub ntawv tseem ceeb (Mill Test Report - MTR):
Daim ntawv pov thawj MTR (CMTR) yog qhov yuav tsum tau ua. Nws yuav tsum muab:
Tag Nrho Traceability: Thaum tshav kub kub, yaj tsom xam, thiab cov khoom loj / ntau tus lej.
Daim Ntawv Qhia Tshuaj Ntsuam Xyuas: Rau ob lub ladle (los ntawm yaj) thiab cov khoom (los ntawm cov khoom tiav).
Mechanical Test Results: Cov nqi tiag tiag piv rau cov kev txwv tshwj xeeb.
Cov ntaub ntawv kho cua sov: Cov ntaub ntawv pov thawj tias cov khoom siv tau tov annealed thiab dej quenched.
Nqe Lus Qhia Txog Kev Ua Raws Cai: Daim ntawv tshaj tawm lees paub cov khoom ua tau raws li txhua qhov kev xav tau ntawm kev txiav txim siab (xws li ASTM B335).
Rau cov phiaj xwm nuclear lossis ASME Code Stamp, cov kev xav tau ntxiv xws li kev txheeb xyuas cov ntaub ntawv zoo (PMI) pov thawj ntawm daim ntawv txais nyiaj thiab ntau dua NDE (ultrasonic testing bars) yuav raug tsim.
