Hauv qhov ntau ntawm kev lag luam -qib stainless hlau,321 stainless hlau yeeb nkab sawv tawm rau nws qhov tshwj xeeb kev sib xyaw ua ke ntawm siab - qhov kub thiab txias thiab kev tiv thaiv corrosion, ua rau nws muaj kev xaiv zoo rau ntau daim ntawv thov tseem ceeb. Tsab ntawv xov xwm no muab cov kev tshuaj xyuas dav dav ntawm nws cov khoom siv, cov xwm txheej tsim nyog, thiab cov kev xaiv tseem ceeb, muab cov lus qhia meej thiab siv tau rau cov khoom siv tshwj xeeb.
1. Cov lus txhais thiab cov yam ntxwv tseem ceeb
321 stainless hlau yeeb nkabyog Ni-Cr-Ti austenitic stainless hlau qib. Qhov sib ntxiv ntawm titanium (Ti) ua ib qho chaw ruaj khov ua rau nws muaj peev xwm tiv thaiv intergranular corrosion thiab nws qhov siab - qhov kub thiab txias. Nws qhov kev ua tau zoo tag nrho yog zoo ib yam li cov 304 stainless hlau, tab sis nws ua tau zoo tshaj qhov kev ua tau zoo nyob rau hauv siab - qhov kub thiab txias ib puag ncig, tshwj xeeb tshaj yog nyob rau hauv oxidizing xov xwm thiab nyob rau hauv tej yam kev mob nrog rau rov ua cua sov.
Cov ntsiab lus ntawm cov yam ntxwv tseem ceeb:
Kev tiv thaiv zoo heev rau intergranular corrosion:Cov khoom titanium nyiam ua ke nrog cov pa roj carbon monoxide, tiv thaiv cov nag lossis daus ntawm chromium carbides ntawm cov ciam teb nplej thiab tiv thaiv corrosion hauv qhov kub thiab txias.
Zoo siab -kev ua haujlwm kub:Tsim nyog rau kev pabcuam txuas ntxiv ntawm qhov kub txog li 800 degree, nrog luv luv - lub sijhawm tiv thaiv kev tiv thaiv mus txog 900 degree, ua haujlwm zoo dua qib zoo li 304 thiab 316L.
Zoo corrosion kuj:Ua tau zoo nyob rau hauv ntau yam organic thiab inorganic acids, nrog rau oxidizing xov xwm, ua rau nws tshwj xeeb tshaj yog haum rau ib puag ncig uas muaj acids los yog chlorides.
Zoo weldability thiab formability:Tsis tshua muaj kev cuam tshuam rau intergranular corrosion susceptibility nrog cov txheej txheem vuam txheej txheem, haum rau fabricated lug xav tau vuam.
2. Cov ntawv thov ib txwm
321 stainless hlau yeeb nkabyog siv dav hauv cov cuab yeej siv thiab cov khoom siv nrog cov kev xav tau meej rau siab -kub tsis kam thiab corrosion kuj, suav nrog:
- High -kub qhov tso tawm tshuab:Cav tso cov kav dej, roj av khib nyiab combustion ducts
- Thaum tshav kub kub exchanger khoom:Boiler casings, tshav kub exchanger qhov chaw, cua sov rauv Cheebtsam
- Cov khoom siv tshuaj thiab lub zog:Chemical transport tanks, furnace ducts, boiler pressure hlab ntsha
- Mechanical thiab txuas Cheebtsam:Cov pob qij txha nthuav dav, kauv-welded kav rau tshuab ziab khaub ncaws, diesel cav silencer qhov chaw
3. Chemical Composition thiab Mechanical Properties (raws li Cov Qauv Txheej Txheem)
| Lub ntsiab | Standard Range |
|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.08% |
| Silicon (Si) | Tsawg dua lossis sib npaug li 1.00% |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 2.00% |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.035% |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.030% |
| Chromium (Cr) | 17.00–19.00% |
| Nickel (Ni) | 9.00–12.00% |
| Titanium (Ti) | Ntau dua lossis sib npaug li 5 × C% |
Tej yam khoom siv tshuab:
Tensile Strength σb Ntau dua lossis sib npaug li 520 MPa
Yield zog σ0.2 Ntau dua lossis sib npaug rau 205 MPa
Elongation δ5 Ntau dua lossis sib npaug li 40%
Hardness Tsawg dua los yog sib npaug rau 187 HB / 90 HRB / 200 HV
4. Yuav ua li cas kom raug xaiv321 stainless hlau yeeb nkab- Cov lus qhia tswv yim rau cov neeg yuav khoom thiab engineers
1. Txhais qhov ntsuas kub ua haujlwm
Yog tias cov cuab yeej ua haujlwm tsis tu ncua ntawm 500-800℃lossis dhau mus dhau kev caij tsheb kauj vab, 321 yog qhov kev xaiv zoo tshaj plaws. Rau qhov kub thiab txias qis dua 500℃nrog cov mob me me, xav txog tus nqi ntau dua - qib 304 zoo.
2. Ua tib zoo ntsuas qhov chaw pabcuam
321 ua tau zoo nyob rau hauv acidic, chloride-muaj, los yog muaj zog oxidizing media. Nws cov titanium-stabilized kom zoo dua yog tshwj xeeb tshaj yog pom nyob rau hauv ib puag ncig combining kub thiab corrosion.
3. Xav txog cov txheej txheem Vuam thiab Fabrication
321 feem ntau tsis xav tau cov tshuaj annealing tom qab vuam. Txawm li cas los xij, nws raug nquahu kom tswj cov cua sov tawm thaum lub sij hawm vuam kom tsis txhob raug cuam tshuam ntev hauv qhov ntsuas kub ntau. Nco ntsoov nws txoj hauj lwm- hardening nyiam thaum lub sij hawm machining thiab kho tej yam tsis raws li.
4. Txheeb xyuas cov ntawv pov thawj thiab cov ntawv xeem
Thaum yuav khoom, thov daim ntawv pov thawj Material Test (MTC) los ntawm tus neeg muag khoom thiab xyuas kom meej tias cov ntsiab lus titanium (Ti) ua tau raws li tus qauv (Ntau dua lossis sib npaug li 5 × C%), vim qhov no yog qhov tseem ceeb rau kev ua kom muaj kev tiv thaiv intergranular corrosion.
5. Ntsuam xyuas lwm yam khoom siv
Yog tias cov peev nyiaj tsawg thiab qhov yuav tsum tau muaj qhov kub thiab txias, xav txog 304 stainless hlau. Rau ntau corrosive ib puag ncig ntawm qhov kub thiab txias, 316L yuav tsim nyog dua. Rau cov mob hnyav uas muaj qhov kub thiab txias thiab muaj zog corrosion kuj, ntsuas 310S lossis siab dua nickel alloys.
5. Kev xav tsis zookev zam
"321 zoo dua 304 hauv txhua qhov chaw." Qhov no tsis muaj tseeb. Rau ib puag ncig ib puag ncig, tsis yog- daim ntawv thov corrosive, 304 muab cov nqi zoo dua -kev ua tau zoo.
"Cov ntsiab lus titanium siab dua yog ib txwm zoo dua." Cov ntsiab lus titanium yuav tsum sib phim nrog cov ntsiab lus carbon. Ti siab heev tuaj yeem ua rau muaj teeb meem hauv forging lossis dov.
"321 yeej tsis xav tau kev tshaj tawm -weld kho." Txawm hais tias feem ntau tsis tas yuav tsum tau, stabilization annealing tseem yuav tsum tau soj ntsuam rau kev pabcuam hauv qhov chaw muaj corrosive heev.
Xaus
321 stainless hlau yog cov khoom siv zoo tshaj plaws nyob rau hauv kev xav tau ib puag ncig uas kub thiab corrosion coexist. Kev xaiv cov khoom raug cuam tshuam tsis yog cov cuab yeej siv tau ntev, tab sis kuj tseem muaj kev nyab xeeb thiab kev saib xyuas cov nqi. Nws raug nquahu kom xav txog kev ua haujlwm tag nrho, cov txheej txheem yuav tsum tau ua, thiab kev txwv nyiaj txiag thaum lub sijhawm qhia tshwj xeeb. Kev sab laj nrog tus kws tsim khoom siv khoom lossis kev sim ua piv txwv yuav raug pom zoo thaum tsim nyog.
Yog tias koj muaj ib daim ntawv thov tshwj xeeb uas xav tau kev tshuaj xyuas ntxiv lossis xav kom tau txais cov ntaub ntawv ntxaws ntxaws ntxiv, thov hu rau peb. Peb npaj txhij los muab321 stainless hlau yeeb nkabkev xaiv cov khoom txhawb nqa raws li koj qhov kev xav tau tiag tiag.
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