1. Taw qhia

Yog tias koj tab tom nrhiav stainless hlau peev castings rau li qub, twj tso kua mis, lossis cov khoom lag luam, koj yuav luag tau ntsib ob ntawm cov qib casting feem ntau: CF8 thiab CF8M.

Thaum xub thawj siab ib muag, lawv zoo sib xws. Ob leeg yog austenitic stainless hlau siv nyob rau hauv raws li -cast condition. Ob leeg muaj kev tiv thaiv corrosion zoo thiab cov khoom siv kho tshuab. Ob leeg yog dav muaj los ntawm peev casting foundries thoob ntiaj teb.

Tab sis lawv tsis yog interchangeable. Xaiv qhov tsis ncaj ncees lawm qib tuaj yeem ua rau tsis ua haujlwm ntxov ntxov, tsis xav txog cov nqi, lossis kev tsis lees paub los ntawm tus neeg siv khoom kawg.

Cov lus qhia no yuav pab koj nkag siab meej thaum twg los qhia CF8, thaum twg yuav hloov mus rau CF8M, thiab vim li cas qhov kev txiav txim siab tseem ceeb rau koj daim ntawv thov.

2. Dab tsi yog CF8 thiab CF8M?

CF8 thiab CF8M yog cov qauv tsim los ntawm ASTM A351 / A351M, tus qauv tshwj xeeb rau austenitic steel castings rau siab- muaj cov khoom. Cov qib no yog qhov sib npaug ntawm cov hlau tsis muaj steel hlau:

CF 8yog qhov sib npaug ntawm wrought304stainless hlau.

CF8Myog qhov sib npaug ntawm wrought316stainless hlau.

Qhov sib txawv tseem ceeb: CF8M muaj molybdenum (Mo), thaum CF8 tsis. Qhov sib ntxiv ntawm cov khoom no muaj qhov cuam tshuam tseem ceeb rau kev tiv thaiv corrosion, mechanical zog, thiab nqi.

3. Kev sib piv tshuaj lom neeg

Qhov tseem ceeb sib txawv yog nyob rau hauv chemistry. Ntawm no yog qhov tseeb muaj pes tsawg leeg rau ASTM A351:

Kev soj ntsuam tseem ceeb:CF8M muaj cov chromium qis dua (16-18% vs 18-20%) tab sis ntxiv 2-3% molybdenum thiab cov ntsiab lus nickel ntau dua (10-14% vs 8-11%). Lub molybdenum yog dab tsi muab CF8M nws superior corrosion kuj.

Wrought sib npaug

4. Mechanical Properties

Ob leeg CF8 thiab CF8M ua tau raws li qhov xav tau ntawm cov cuab yeej cuab tam yam tsawg kawg nkaus rau ASTM A351, tab sis muaj qhov sib txawv me me:

Nco tseg:CF8 muaj qhov qis dua me ntsis elongation (35% vs 30%), ua rau nws me ntsis ductile. CF8M cov ntsiab lus molybdenum tuaj yeem muab qhov zoo dua me ntsis siab dua - qhov kub thiab txias.

5. Corrosion Resistance: Qhov sib txawv tseem ceeb

Qhov no yog ib qho tseem ceeb tshaj plaws hauv kev txiav txim siab CF8 vs CF8M.

2-3% molybdenum nyob rau hauv CF8M muab kev tiv thaiv zoo rau:

Pitting corrosion nyob rau hauv chloride-muaj ib puag ncig

Kev txhim kho corrosion

Kev ntxhov siab corrosion cracking (SCC) hauv qee qhov chaw

Sulfuric acid thiab lwm yam acids txo

Nyob rau hauv cov nqe lus tswv yim:

CF8 (304) yog tsim rau dej tshiab, ua zaub mov, thiab ib puag ncig tshuaj lom neeg

CF8M (316) yuav tsum muaj rau cov dej hiav txwv, dej hiav txwv, kev ua tshuaj, thiab kev siv tshuaj

Kev muaj tiag ntawm kev lag luam:Thaum Flowserve, KSB, los yog Sulzer qhia cov ntaub ntawv rau cov twj tso kua mis tuav dej hiav txwv lossis cov tshuaj lom neeg, CF8M (los yog qib siab dua li duplex) yuav luag txhua qhov yuav tsum tau muaj yam tsawg kawg nkaus. CF8 feem ntau tshwj tseg rau cov dej tshiab thiab kev pabcuam kev lag luam.

Kev sib piv Corrosion Resistance

6. Cov ntawv thov ib txwm

CF8 (304) feem ntau yog siv rau:

Lub rooj vag valve lub cev thiab lub kaus mom rau dej thiab chav ua haujlwm

Tshawb xyuas cov khoom siv valve hauv cov xov xwm tsis yog - txhoj puab heev

Khoom noj khoom haus machinery Cheebtsam (tswj vaj tse, conveyor qhov chaw)

Architectural hardware thiab handrail fittings

General industrial castings qhov twg corrosion yog tsawg

Cov iav fittings thiab spigot Cheebtsam

CF8M (316) yog teev rau:

Chemical twj tso kua mis casings thiab impellers

Lub cev valve tuav nruj lossis chloride- muaj cov kua dej

Marine hardware thiab seawater system Cheebtsam

Cov khoom siv tshuaj thiab bioprocess

Daim ntawv thiab pulp kev lag luam Cheebtsam

Thaum tshav kub kub exchangers thiab condenser Cheebtsam

Offshore roj thiab roj instrumentation

Tiag -world piv txwv:Ib lub tuam txhab European valve nrhiav lub cev lub cev rau cov khoom siv tshuaj lom neeg feem ntau yuav qhia CF8M raws li qhov tsawg kawg nkaus. Tib lub chaw tsim khoom tsim cov rooj vag li qub rau cov dej hauv nroog tuaj yeem siv CF8. Qhov kev txiav txim siab yog tsav tag nrho los ntawm qhov kawg daim ntawv thov thiab cov kua dej ua haujlwm.

7. Weldability thiab Machinability

Weldability:Ob leeg CF8 thiab CF8M muaj kev sib txuas zoo. Txawm li cas los xij, CF8M yuav tsum tau muab cov hlau sib txuam (ER316L) kom muaj kev tiv thaiv corrosion hauv thaj tsam vuam. CF8 siv ER308L muab tub lim.

Machineability:CF8 yooj yim me ntsis rau lub tshuab vim nws ua haujlwm qis dua - tus nqi hardening. CF8M cov ntsiab lus molybdenum nce kev ua haujlwm- hardening, uas tuaj yeem ua rau cov cuab yeej hnav sai dua. Hauv kev xyaum, qhov sib txawv yog tswj tau nrog cov cuab yeej tsim nyog thiab nrawm.

Ob qib yog niaj hnub machined hauv peb qhov chaw siv 4-axis thiab 5-axis CNC machining chaw, tsis muaj kev sib tw tshwj xeeb tshaj li cov qauv stainless hlau machining kev coj ua.

8. Tus nqi sib piv

CF8M yog kim dua CF8 vim ntau dua nickel thiab molybdenum cov ntsiab lus. Tus nqi sib txawv hloov pauv nrog cov khoom lag luam, tab sis qhov dav dav yog:

Hwm:CF8M feem ntau raug nqi 25-40% ntau dua CF8 ntawm ib-kg, nyob ntawm tus nqi LME nickel thiab molybdenum tam sim no.

9. Yuav Xaiv Li Cas: Lub Ntsiab Cai Txiav Txim Siab

Thaum txiav txim siab ntawm CF8 thiab CF8M, nug koj tus kheej peb cov lus nug hauv kev txiav txim:

Nqe Lus Nug 1: Cov kua dej los yog cov xov xwm yuav ua li cas?

Qhov no yog ib qho tseem ceeb tshaj plaws.

Cov dej tshiab, cua, chav, zaub mov → CF8 txaus

Seawater, chlorides, tshuaj, acids → CF8M yog qhov tsawg kawg nkaus

Yog tias tsis paub meej, sab laj nrog NACE MR0175 / ISO 15156 cov lus qhia rau roj thiab roj, lossis tus qauv API cuam tshuam

Nqe Lus Nug 2: Qhov kev khiav hauj lwm kub yog dab tsi?

Ob qib ua tau zoo los ntawm cryogenic mus rau 800℃F (425 degree)

Rau kev pabcuam sib cuam tshuam txog 1500℃F (815 degree), CF8M muaj qhov me ntsis vim molybdenum

Rau kev ua haujlwm siab - qhov kub thiab txias, xav txog HK lossis HP qib cua sov- cov hlau tsis muaj zog

Nqe Lus Nug 3: Tus nqi -kev lag luam muaj txiaj ntsig- tawm yog dab tsi?

Rau lub cev valve yooj yim hauv kev pabcuam dej, CF8 yog qhov kev xaiv nyiaj txiag

Rau lub twj tso kua mis tshuaj, 25-40% tus nqi them rau CF8M yog qhov tsis tseem ceeb piv rau tus nqi ntawm kev ua tsis tiav ntxov

Xav txog tag nrho cov nqi: CF8M feem ntau ntxiv 5-15% rau tag nrho cov nqi, tab sis tsis ua haujlwm hauv kev pabcuam tuaj yeem raug nqi 100x uas

Kev txiav txim siab Matrix:

10. Cov lus nug uas nquag nug

Q: Kuv puas tuaj yeem hloov CF8M rau CF8?

A: Yog lawm, tab sis feem ntau nws dhau - specification. CF8M nqi 25-40% ntxiv. Txawm li cas los xij, yog tias koj cov saw hlau xav tau tus qauv ntawm CF8M kom txo qhov nyuaj, tsis muaj teeb meem kev siv CF8M qhov twg CF8 tau teev tseg.

Q: Kuv puas tuaj yeem hloov CF8 rau CF8M?

A: Feem ntau tsis muaj, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig corrosive. Qhov tsis muaj molybdenum hauv CF8 ua rau nws yooj yim rau pitting thiab crevice corrosion hauv chloride-muaj ib puag ncig. Nco ntsoov xyuas nrog koj pab neeg ua haujlwm engineering ua ntej txo qis.

Q: Qhov txawv ntawm CF8M thiab 316 yog dab tsi?

A: CF8M yog cov cam khwb cia sib npaug ntawm wrought 316. Cov tshuaj muaj pes tsawg leeg zoo sib xws, tab sis CF8M (raws li ib qho casting) tej zaum yuav muaj cov khoom sib txawv me ntsis vim cov cam khwb cia microstructure. ASTM A351 CF8M thiab ASTM A276 316 tsis tuaj yeem hloov pauv ncaj qha yam tsis muaj kev tshuaj xyuas tsim qauv.

Q: Dab tsi NDT tau pom zoo rau CF8 thiab CF8M castings?

A: Txheem NDT suav nrog kev tshuaj xyuas qhov muag, kev tshuaj xyuas qhov ntev (CMM), thiab kev ntsuas siab. Rau cov ntawv thov tseem ceeb, dye penetrant (PT) rau qhov chaw tsis xws luag thiab radiographic (RT) lossis ultrasonic (UT) rau qhov tsis xws luag yog pom zoo. Raws li IATF 16949 certified foundry, peb tuaj yeem txhawb nqa txhua theem ntawm NDT rau koj qhov kev qhia tshwj xeeb.

Q: CF8M puas tuaj yeem siv rau kev pabcuam cryogenic?

A: Yog. Ob leeg CF8 thiab CF8M khaws cov kev cuam tshuam zoo ntawm qhov kub thiab txias. CF8 feem ntau yog siv rau LCB (tsawg carbon) valve lub cev daim ntawv thov mus rau -46 degree. CF8M ua haujlwm zoo ib yam.

Q: PREN (Pitting Resistance Equivalent Number) yog dab tsi?

A: PREN=Cr% + 3.3 × Mo% + 16 × N%. Rau CF8: kwv yees li 19. Rau CF8M: kwv yees li 24-26. Qhov siab dua PREN ntawm CF8M lees paub nws qhov kev ua haujlwm zoo tshaj plaws, uas yog vim li cas Flowserve thiab KSB qhia CF8M rau dej hiav txwv thiab tshuaj siv twj tso kua mis.

Xav tau kev pab xaiv qib zoo?

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