Koj pom 304L stainless hlau ntawm ntau cov nplooj ntawv spec, nws yuav luag tom qab suab nrov. Qhov sib txawv ntawm cov pa roj carbon tsawg ntawm 304, zoo rau vuam, tiv thaiv corrosion - txhua tus paub tias, txoj cai? Qhov ntawd yog thawj ntxiab. Hauv kev xyaum, qhov sib txawv ntawm ASTM spec thiab yuav ua li cas nws ua tau zoo nyob rau hauv ib qho chaw tsim khoom lossis hauv pem teb ntawm lub tshuab khw yog qhov chaw ua haujlwm tiag tiag. Kuv tau pom ntau txoj haujlwm ua rau poob siab vim qee tus neeg tsuas yog zuam lub thawv rau 304L yam tsis xav txog qhov tsim tiag tiag, cua sov, lossis qhov nws yuav tshwm sim tiag tiag. Nws tsis yog rab phom khawv koob; nws yog ib yam khoom nrog quirks koj kawm los ntawm koj txhais tes qias neeg.
L tsis yog tsab ntawv xwb
Txhua tus tsom rau cov ntsiab lus carbon, max 0.03%, tiv thaiv carbide nag lossis daus thaum vuam. Qhov ntawd yog phau ntawv. Tab sis nyob rau hauv peev casting, uas yog peb qhob cij thiab butter ntawm Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), L txhais tau tias lwm yam thaum lub sij hawm nchuav. Lub yaj coj txawv txawv. Nws yog me ntsis qis dua, cov kua dej tsawg dua li tus qauv 304. Yog tias koj lub rooj vag thiab qhov nce siab yog tsim los rau cov yam ntxwv ntws ntawm 304, koj yuav xaus nrog cov mistruns lossis cov teeb meem shrinkage hauv cov ntu tuab nrog 304L. Nws yog qhov hloov maj mam, tab sis nws yuam koj los kho tus qauv thiab cov txheej txheem. Peb kawm qhov no thaum ntxov, tsis yog los ntawm phau ntawv, tab sis los ntawm ib pawg ntawm lub cev valve uas yuav tsum tau muab pov tseg.
Tom qab ntawd muaj kev kho cua sov tom qab-casting. Kev daws annealing yog qhov tseem ceeb, tab sis qhov kub ntawm qhov rais xav tias nruj dua. Koj tab tom npaj kom yaj cov carbides thiab tau cov chromium carbides rov qab rau hauv kev daws teeb meem, tab sis koj kuj tsis muaj peev xwm ua kom nws nce ntau dhau. Peb khiav nws feem ntau ntawm ° C, ua raws li qhov nrawm nrawm. Lub quench nruab nrab tseem ceeb heev. Cov dej yog txhoj puab heev thiab tuaj yeem ua rau muaj kev cuam tshuam ntawm cov txheej txheem, nyias-walled castings; Qee lub sij hawm peb xaiv rau qhov yuam cua quench rau ntau qhov muag muag. Nws yog ib qho kev txiav txim hu raws li qhov geometry, ib yam dab tsi koj tsim kev xav rau lub sijhawm.
Thiab vuam? Tseeb, nws yog ntau weldable. Tab sis nyob rau hauv peb CNC machining thiab ua tiav chav haujlwm, peb feem ntau tau txais cov khoom pov tseg uas xav tau kev kho vuam lossis sib dhos. Lub vuam nws tus kheej tej zaum yuav suab, tab sis lub tshav kub-cuam tshuam cheeb tsam (HAZ) ntawm 304L, thaum ntau resistant rau rhiab heev, tseem tuaj yeem hloov pauv microstructural uas cuam tshuam rau hauv zos corrosion kuj yog tias koj tsis ceev faj nrog interpass kub tswj. Nws yog qhov zoo, tab sis nws tsis yog invincible. Koj tseem xav tau ib tug welder uas nkag siab txog cov khoom siv, tsis yog cov txheej txheem xwb.
Machining 304L: Lub Gummy Reality
Qhov no yog qhov uas txoj kev xav tau ntsib cov cuab yeej txiav, feem ntau nrog kev poob siab screech. 304L muaj npe nrov rau kev ua haujlwm tawv. Yog tias koj lub cuab yeej tsis ntse, yog tias koj cov khoom noj thiab nrawm tawm, lossis yog tias koj nyob ib pliag, koj yuav ua rau lub ntsej muag tawv, ua rau kev npau suav phem tom ntej. Nws tsis nti zoo; nws nyhav tsim ntev, stringy swarf uas yog mob thiab muaj kev nyab xeeb.
Peb tau hais ob peb txoj cai hauv peb lub khw. Positive rake geometry, tsis muaj lus nug. Ntses, coated carbide inserts-peb tau txais txiaj ntsig zoo nrog AlTiN txheej. Tsis tu ncua, txhoj puab heev pub. Koj tsis tuaj yeem ntshai; koj yuav tsum tau nyob rau hauv lub work-hardened txheej. Coolant tsis tuaj yeem sib tham, thiab ntau ntawm nws, tsis yog tsuas yog ua kom txias xwb tab sis pab ua kom cov nti. Peb khiav qis dua qhov nrawm dua li qhov koj xav tau rau cov pa roj carbon steel, tab sis nrog tus nqi pub ntau dua. Nws yog ib qho kev sib npaug uas koj tweak rau txhua txoj haujlwm tshwj xeeb. Lub tsev twj tso kua mis complex nrog nyias phab ntsa tshuab txawv dua li cov khoom flange.
Qhov phem tshaj plaws yog thaum koj tau txais lub casting nrog inconsistent hardness. Qee zaum, vim muaj kev hloov pauv me ntsis ntawm cov cua txias hauv pwm, koj tuaj yeem tau txais cov pob uas nyuaj dua li lwm tus. Koj lub cuab yeej humming nrog, ces mam li nco dheev nws chatters thiab hlawv. Koj yuav tsum nres, xyuas, tej zaum txawm tias tag nrho cov khoom ntxiv yog tias nws tsis zoo. Nws yog ib qho laj thawj vim li cas cov txheej txheem tswj los ntawm cov yaj mus rau kev kho cua sov yog qhov tseem ceeb heev. Ib lub tuam txhab zoo li QSY, nrog xyoo caum hauv plhaub molding thiab peev casting, tsim cov kev paub hauv tsev rau hauv kev ua haujlwm kom txo qis cov kev hloov pauv no, tab sis kev xav tsis thoob tseem tshwm sim.
Corrosion: Nws yog hais txog ib puag ncig, tsis yog qib
Qhov no yog qhov misconception loj tshaj plaws. Cov neeg qhia 304L rau corrosion kuj raws li daim pam lub sij hawm. Tab sis zoo li cas ntawm corrosion? Huab cua? Tseeb, nws zoo heev. Kev raug tshuaj lom me me? Tej zaum zoo. Tab sis kuv tau pom qhov ua tsis tiav hauv ib puag ncig tshwj xeeb, tsis zoo.
Chlorides yog cov arch-nemesis. Txawm nyob rau hauv chav tsev kub, chloride ions tuaj yeem ua rau pitting thiab crevice corrosion. Peb muab qee qhov 304L fittings rau cov nroj tsuag ntug dej hiav txwv cov kab tsis tseem ceeb. Lawv saib zoo rau ib xyoos, tom qab ntawd pib xau los ntawm pinprick pits nyob rau hauv cov cuab yeej rwb thaiv tsev uas tau khaws cov dej noo. Cov khoom siv yog spec, tab sis ib puag ncig yog tsis ncaj ncees lawm. Rau qhov ntawd, koj yuav tsum dhia mus rau 316L nrog molybdenum. Zaj lus qhia tsis yog hais txog cov hlau zoo; nws yog hais txog kev siv engineering.
Tom qab ntawd muaj intergranular corrosion. Qib L tiv thaiv nws los ntawm kev vuam, tab sis yog tias qhov chaw nyob hauv qhov kub ntawm 450-850 ° C ntev heev thaum lub sijhawm ua haujlwm - hais tias, nyob ze ntawm qhov chaw tshav kub - qhov kev nkag siab tseem tuaj yeem tshwm sim dhau sijhawm. Nws yog qhov tsis ua haujlwm qeeb. Koj yuav tsum xav txog tag nrho lub neej voj voog ntawm kev tivthaiv, tsis yog li cas nws tau ua.
Alloy Nuance nyob rau hauv ib lub khw muag khoom ntau
Ua haujlwm hauv qhov chaw zoo li peb ntawm QSY, qhov twg peb lis txhua yam los ntawm nrum hlau rau tshwj xeeb alloys zoo li cov nickel-based sawv daws yuav, muab kev pom rau koj. 304L tsis pom nyob rau hauv kev sib cais. Nws yog ib feem ntawm spectrum. Nws qhov txiaj ntsig loj yog tus nqi thiab kev muaj dav dav piv rau cov nickel alloys siab. Tab sis nws cov kev txwv txhais nws qhov chaw.
Piv txwv li, thaum tus neeg siv khoom xav tau qhov kub thiab txias, peb coj lawv tawm ntawm 304L mus rau peb. Nickel-raws li alloys. Thaum lawv xav tau kev tiv thaiv corrosion heev hauv kev txo cov kua qaub, tej zaum nws yog lub sijhawm rau cobalt-based alloys. 304L zaum hauv qhov chaw qab zib ntawm kev ua tau zoo dav dav thiab kev tsim khoom rau ntau yam khoom lag luam - cov twj tso kua mis, lub cev lub cev, cov khoom noj khoom haus, cov khoom siv vaj tsev. Nws yog ib tug workhorse.
Tab sis txawm li ib tug workhorse, kab kawm tseem ceeb. Peb ua tib zoo mloog mus rau lub yaj chemistry. Ib me ntsis sulfur yuav txhim kho machinability tab sis ua mob corrosion kuj. Txoj cai sib npaug ntawm silicon tuaj yeem txhim kho fluidity rau casting. Nws yog cov sub-spec cov ntsiab lus uas sib txawv ib pawg uas cov tshuab zoo li butter thiab kav ntev li kaum xyoo los ntawm ib qho uas ua rau mob taub hau los ntawm ib hnub.
Xaus Tsis Muaj Hneev
Yog li, tsis yog, 304L tsis yog khoom xwb. Nws yog cov khoom siv uas nws qhov kev ua tau zoo raug kaw (lossis cuam tshuam) hauv cov ntsiab lus ntawm cov txheej txheem. Thaum kawg ntawm lub hnub, kev ua tiav ntawm 304L tivthaiv yog nyob ntawm ntau npaum li cas ntawm qhov chaw tsim khoom, kev siv tshuab ua haujlwm, thiab tus kws ua haujlwm ib puag ncig tshwj xeeb raws li nws tau ua nyob rau hauv kev sib ntsib ASTM A743. Nws yog kev sib koom tes ntawm cov khoom siv thiab cov neeg tsim khoom. Koj tsis tuaj yeem xaj nws los ntawm phau ntawv teev npe thiab cia siab tias yuav ua tiav. Koj yuav tsum to taub nws tus cwj pwm, nws nyiam, thiab hwm nws cov ciam teb. Qhov ntawd yog dab tsi peb xyoo caum ntawm casting thiab machining qhia koj - kom pom cov hlau, tsis yog tus lej xwb.
