Thaum koj hnov N08825, lossis Alloy 825, qhov kev xav tam sim yog feem ntau 'corrosion-resistant nickel-hlau-chromium alloy'. Qhov ntawd yog phau ntawv. Tab sis nyob rau hauv lub foundry thiab machining ntiaj teb no, daim ntawv lo NW nyuam qhuav khawb qhov nto. Cov dab neeg tiag tiag tsis yog nyob rau hauv daim ntawv spec; nws yog nyob rau hauv lub ncuav, txiav, lub tshav kub kho, thiab cov countless me kev txiav txim siab uas cais ib tug ua tau zoo tivthaiv los ntawm ib tug kim kim pawg. Kuv tau pom ntau qhov project stumble los ntawm kev kho nws zoo li lwm yam stainless. Tsis yog.
Lub Foundry Floor Reality nrog 825
Casting N08825 yog qhov twg txoj kev xav ntsib hluav taws, lus. Cov ntsiab lus npib tsib xee siab muab nws qhov kev tiv thaiv zoo heev los txo cov kua qaub thiab kev ntxhov siab-corrosion tawg, tab sis nws kuj ua rau nws yog tsiaj nyaum rau lub plhaub lossis peev casting. Tus qauv solidification yog ... finicky. Koj tsis tuaj yeem siv tib lub rooj vag thiab nce qhov system koj xav siv rau 316 stainless ib feem thiab cia siab rau qhov zoo tshaj plaws. Lub shrinkage yog txawv, lub fluidity xav txawv. Thaum ntxov, peb muaj ib pawg rau qee lub cev lub cev uas ua rau pom micro-porosity hauv cov ntu tuab. Cov chemistry yog zoo meej rau daim ntawv pov thawj, tab sis cov qauv tsis suab.
Qhov teeb meem taug qab rov qab mus rau qhov kub thiab txias ntawm pwm pre-heat. Peb tau khiav nws txias heev, sim txo cov hlau poob thiab oxidation, tab sis nrog 825, uas tsuas yog ntxiab gases thiab tsim teeb meem shrinkage. Koj xav tau lub tshav kub txaus kom nws khiav nyias, tab sis tsis siab heev koj hlawv tawm cov hlau alloying los yog tawm tsam lub plhaub ceramic aggressively. Nws yog lub qhov rais nqaim. Ib tug khub zoo li Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), nrog lawv peb lub xyoo caum hauv plhaub thiab peev casting, tau txais qhov no. Tej zaum lawv yuav pom tib lub seev cev. Lawv cov kev paub dhau los ntawm cov alloys tshwj xeeb txhais tau tias lawv tej zaum tau tsim cov txheej txheem rau lub ncuav nkhaus thiab pwm npaj tshwj xeeb rau cov qib nickel-based, uas yog ib nrab ntawm kev sib ntaus sib tua yeej.
Kev kho cua sov tom qab cam khwb cia yog tsis sib tham. As-cam khwb cia 825 muaj carbides thiab intermetallics uas rhuav tshem nws cov khoom corrosion. Koj xav tau qhov kev daws teeb meem uas nyob ib puag ncig ° F ua raws li qhov nrawm nrawm kom tau txais txhua yam rov qab mus rau hauv cov tshuaj. Hla nws los yog cuam tshuam tus nqi quench, thiab ib feem yuav dhau qhov ntsuas qhov ntsuas tab sis yuav ua tsis tiav hauv thaj teb, piv txwv li ib puag ncig chloride. Nws yog ib kauj ruam tseem ceeb uas ntxiv cov nqi thiab sijhawm, thiab koj tsis tuaj yeem txiav cov fab.
Machining: Qhov twg Tooling mus tuag (Yog tias koj tsis ceev faj)
Yog tias casting nws tsis yooj yim, machining N08825 yog qhov uas koj khwv tau koj cov kab txaij. Hu nws 'gummy' yog qhov tsis txaus ntseeg. Nws tsis nti; Nws tsim cov ntev, stringy, tawv swarf uas tuaj yeem qhwv ib ncig ntawm txhua yam thiab ua rau muaj kev puas tsuaj. Tus nqi ua haujlwm-hardening yog qhov zoo heev. Ib me ntsis npub ntxig los yog lub teeb ci dhau lawm yuav cia li glaze rau saum npoo, hardening nws thiab ua rau qhov kev hla dhau mus txawm nyuaj, ua rau cov cuab yeej tsis ua hauj lwm sai thiab muaj peev xwm ua kom puas rau qhov chaw.
Peb kawm txoj kev nyuaj ntawm txoj haujlwm twj tso kua mis. Siv cov qib carbide rau stainless hlau? Kev puas tsuaj. Cov cuab yeej lub neej tau ntsuas hauv feeb, tsis yog teev. Qhov saum npoo tiav tsis zoo, thiab peb tau sib ntaus sib tua tsis tu ncua vim cua sov thiab siab. Qhov kev tawg tau los ntawm kev hloov mus rau qib siab - tawv, ntse-edged carbides nrog cov txheej txheem tshwj xeeb, thiab cov cuab yeej tsis sib xws nrog tsawg kawg nkaus. Coolant tsis yog ua kom txias ntawm no xwb; nws yog rau lubrication thiab tawg ntawd nti. Kev kub siab, los ntawm cov cuab yeej coolant yuav luag yuav tsum tau rau txhua qhov ntim loj.
Qhov no yog qhov chaw ua haujlwm puv-kev pabcuam kev sib koom ua ke tseem ceeb. Lub tuam txhab uas tuav ob qho tib si casting thiab cov CNC machining hauv tsev, zoo li cov kev pabcuam tau teev tseg rau https://www.tsingtaocnc.com, muaj qhov zoo sib xws. Cov machinists nyob ntawd tsis pom ib tug raw, annealed billet; lawv nyob nraum soj ntsuam nrog lawv tus kheej foundry lub castings. Lawv paub qhov zoo li-cam khwb cia ntawm daim tawv nqaij, qhov zoo li hardness variation, thiab muaj peev xwm tailor lawv machining tswv yim los ntawm thawj roughing dhau. Qhov kev paub kaw kaw no tiv thaiv ntau qhov kev kwv yees thiab cov cuab yeej kev tua neeg uas tshwm sim thaum lub khw machining tau txais 'black box' casting los ntawm qhov tsis paub.
Alloy Selection Trap: Thaum 825 Tsis yog Cov Lus Teb
Ntawm no yog ib qho pitfall: qhia N08825 vim nws yog ib tug paub zoo 'corrosion-resistant alloy' nyob rau hauv ib daim ntawv teev, tsis muaj tag nrho cov tsom xam ntawm ib puag ncig. Nws yog qhov zoo tshaj plaws rau sulfuric thiab phosphoric acid ib puag ncig, zoo rau dej hiav txwv. Tab sis yog tias koj tab tom cuam tshuam nrog kub, concentrated chlorides lossis qee yam oxidizing acid sib tov, tej zaum yuav muaj kev xaiv zoo dua li cov hlau ntau dua-molybdenum lossis txawm tias titanium. Kuv nco qab txog ib qhov project rau cov tshuaj ua cov tshuaj txhuam hniav uas tus neeg siv tau hais rau 825 raws li qhov qub spec. Kev tshuaj xyuas ntawm cov txheej txheem tiag tiag, uas muaj cov kab mob ferric thiab cupric chlorides, qhia tias peb tau flirting nrog pitting corrosion. Peb yuav tsum thawb rov qab thiab tawm tswv yim lwm txoj hauv kev.
Qhov no yog vim li cas cov khoom muaj peev xwm yog qhov tseem ceeb. Tus neeg muag khoom uas teev cov kev paub nrog ntau yam Nickel-raws li alloys thiab cobalt-based alloys tsis yog tsuas yog qhia tawm cov ntawv qhia zaub mov xwb. Nws txhais tau hais tias lawv (los yog lawv cov metallurgists) tej zaum yuav koom nrog cov kev sib tham ua ntej. Lawv tuaj yeem saib cov ntawv luam tawm thiab nug cov lus nug zoo txog qhov kub thiab txias, pH, cov kab mob sib kis, thiab qib kev ntxhov siab. Txoj kev sib tham ntawd cawm txhua tus neeg los ntawm kev ua tsis tiav hauv txoj kab.
Nws kuj cuam tshuam rau kev tsim khoom. Qee lub sij hawm, me ntsis tweak rau tus qauv tsim - lub vojvoog dav dav, kev hloov pauv ntawm phab ntsa tuab - tuaj yeem ua rau casting thiab machining 825 yooj yim dua yam tsis muaj kev cuam tshuam. Lub khw uas tsuas yog ua cov khoom luam tawm yuav tsis muab qhov ntawd. Ib qho uas engineers cov txheej txheem tsim khoom los ntawm cov khoom siv tuaj yeem.
Vuam thiab Fabrication: Qhov Ncauj Kev Nyuaj Siab
Cheebtsam tsis tshua muaj tsuas yog cam khwb cia thiab machined. Lawv feem ntau yuav tsum tau welded rau lwm daim, los yog muaj nozzles welded rau. N08825 suav hais tias yog weldable, thiab nws yog, tab sis 'weldable' tsis txhais hais tias 'kev zam txim'. Koj xav tau cov khoom siv hlau sib txuam (xws li INCO-Weld 825 lossis zoo sib xws), thiab kev tswj nruj ntawm kev sib tshuam ntawm qhov kub thiab txias. Thaum tshav kub kub ntau dhau, thiab koj tuaj yeem ua rau cov carbides nyob rau hauv qhov chaw muaj kev kub ntxhov (HAZ), tsim kom muaj ib qho nqaim ntawm cov khoom uas tau poob nws cov kev tiv thaiv corrosion thiab ua rau nkig.
Peb tsim ib lub tank loj hauv ob sab phlu, thiab tom qab hydrotesting, cov kab nrib pleb zoo tshwm sim hauv HAZ ze rau ob peb lub seams. Post-mortem qhia tias nws yog ib qho kev sib txuas ntawm me ntsis tawm ntawm cov hlau chemistry thiab cia lub interpass temp creep. Lub weld hlau nws tus kheej zoo, tab sis thaj tsam ntawm nws tau cuam tshuam. Nws yog qhov ua tsis tau zoo uas tsis tshwm sim kom txog thaum nws muaj kev ntxhov siab lossis hauv kev pabcuam. Tam sim no, txoj cai yog tag nrho cov txheej txheem tsim nyog thiab, rau qhov tseem ceeb, tej zaum yuav muaj kev kho cua sov tom qab kev kho HAZ, tab sis qhov ntawd feem ntau ua tsis tau zoo ntawm cov ntaub ntawv loj.
Qhov no yog lwm qhov kev sib cav rau kev sib sau ua ke. Yog tias tib tus neeg muag khoom ua qhov casting thiab machining tseem tuav cov fabrication, lawv muaj tag nrho cov keeb kwm thermal ntawm ib feem. Lawv paub raws nraim li cas cov khoom nyob rau hauv ua ntej lub welder kov nws, uas yog ib tug loj variable tshem tawm ntawm qhov sib npaug.
Daim Ntawv Pov Thawj Zoo: Tso siab rau, tab sis Tshawb Fawb Tsis Txaus Siab
Nrog rau cov hlau zoo li no, cov ntaub ntawv (Certs of Conformity) yog cov kab pib, tsis yog kab tiav. Daim ntawv pov thawj yaj qhia rau koj tias chemistry yog nyob ntawm lub ladle. Nws tsis qhia koj txog kev ncaj ncees ntawm qhov kawg casting lossis cov teebmeem ntawm machining. Positive Material Identification (PMI) thaum tau txais, thiab dua ntawm qhov ua tiav, yog kev pov hwm pheej yig. Kuv twb pom mix-ups qhov zoo li-zoo stainless qib tau siv los ntawm yuam kev.
Rau cov kev pabcuam tseem ceeb, tshwj xeeb tshaj yog rau corrosion, feem ntau koj xav tau ntau dua. Qhov no yuav suav nrog kev ntsuas kev sib xyaw ua ke ntawm ASTM G28 Txoj Kev A rau HAZ ntawm welds, lossis kev kuaj xyuas cov ntsiab lus ferrite. Dye penetrant lossis radiographic kuaj rau castings yog yuav luag muab. Tus nqi ntawm cov kev xeem no yuav tsum tau muab ci los ntawm qhov pib; lawv tsis yog 'ntxiv'. Ib tus neeg muag khoom siv tau ua haujlwm nrog cov no tshwj xeeb alloys yuav muaj cov txheej txheem xeem no hauv lawv cov txheej txheem kev ua haujlwm thiab yuav tsis balk rau lawv. Lawv lub vev xaib hais txog cov ntaub ntawv zoo li no, uas txhais tau hais tias kev ua haujlwm zoo tsim los tswj lawv.
Qhov kawg takeaway? N08825 yog cov khoom siv zoo heev thaum siv kom raug. Tab sis nws qhov kev ua tau zoo yog inextricably txuas mus rau craftsmanship siv nyob rau hauv txhua txhua kauj ruam - los ntawm cov foundry furnace mus rau lub kawg QC stamp. Nws muab nqi zog rau kev txawj ntse thiab rau txim rau shortcuts. Qhov ntawd yog qhov sib txawv tiag tiag ntawm ib feem uas tsuas yog ua los ntawm Alloy 825 thiab ib qho uas ua tau tiag tiag li Alloy 825 yuav tsum.
