Ob leeg304 thiab 321 stainless hlautau dav siv cov qib austenitic, tab sis lawv sib txawv hauv cov khoom muaj pes tsawg leeg, cov khoom, thiab cov kev siv tsim nyog. Cov kev sib txawv tseem ceeb tuaj yeem muab sau los ntawm tsib qhov loj me:
1. Tshuaj muaj pes tsawg leeg
304 stainless hlau feem ntau muaj txog 18% chromium (Cr) thiab 8% npib tsib xee (Ni), nrog rau cov ntsiab lus siab tshaj carbon tsawg dua lossis sib npaug li 0.08%.
321 stainless hlau tsim nyob rau hauv304 stainless hlaumuaj pes tsawg leeg los ntawm kev ntxiv titanium (Ti) nyob rau hauv thaj tsam ntawm 0.3-0.7%. titanium cov ntaub ntawv ruaj khov TiC tebchaw, uas txhim khu cov khoom tiv thaiv intergranular corrosion, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ntawm 450-850 degree, los ntawm inhibiting chromium carbide nag lossis daus.
2. Siab -Kev Ua Haujlwm Kub
304 stainless hlau tuaj yeem siv txuas ntxiv mus txog kwv yees li 870 degree, nrog luv luv - lub sij hawm raug mob nyob ib ncig ntawm 925℃. Txawm li cas los xij, nws muaj feem cuam tshuam rau kev hnov mob -intergranular corrosion- thaum tuav hauv qee qhov kub thiab txias.
321 stainless hlau muaj superior siab - kub stability vim titanium stabilization, cia txhim khu kev qha ntev - lub sij hawm kev pab cuam mus txog 800℃nrog notably zoo tiv thaiv intergranular nres tshaj 304.
3. Mechanical Properties: Chav ntsuas kub vs. Qhov kub thiab txias
Nyob rau hauv chav tsev kub, ob qib qhia zoo sib xws:
304: Yield zog ~ 205 MPa, tensile zog ~ 515 MPa, elongation ~ 40%
321: Yield zog ~ 220 MPa, tensile zog ~ 520 MPa, elongation ~ 35%
Ntawm qhov kub siab (piv txwv li, 500 degree),321 stainless hlautuav kwv yees li 15% siab zog tuav piv rau 304, ua rau nws zoo dua rau kev thauj khoom -cov ntaub ntawv siv nyob rau hauv cov cua kub ntev.
4. Fabrication thiab Vuam
304 stainless hlau muaj kev ua haujlwm txias txias thiab yooj yim tsim los ntawm stamping, dabtsi yog khoov, thiab lwm yam. Vuam feem ntau ua los ntawm 308L- hom muab tub lim hlau.
Rau 321 stainless hlau, vuam yuav tsum nruj tswj ntawm interpass kub (pom zoo<150°C) and the use of titanium-stabilized filler metals such as Type 347 to prevent intergranular corrosion in the heat-affected zone. Its higher work-hardening rate may necessitate intermediate annealing during deep drawing operations.
5. Cov ntawv thov ib txwm
304 stainless hlau yog dav siv rau cov khoom noj khoom haus, tshuaj tank, architectural trim, thiab cov khoom siv hauv tsev vim nws qhov sib npaug corrosion tsis kam thiab tus nqi -effectiveness.
321 stainless hlau yog qhov zoo dua rau kev ua haujlwm siab ntev - kub, xws li hauv petrochemical cracking hlab, aero- cav Cheebtsam, tshav kub exchangers, thiab boiler qhov chaw uas ua hauj lwm ntev - lub sij hawm ntawm 500-800℃.
FAQ
Q: Puas yog 304 lossis 321 stainless hlau zoo dua?
Nws nyob ntawm qhov kub thiab txias. Rau cov ntawv thov qis dua 450 degree, 304 yog tus nqi ntau dua - zoo. Rau kev siv ntev dua 500℃lossis hauv thermal cycling, 321 ua tau zoo dua vim nws cov ntsiab lus titanium.
Q: Dab tsi yog 321 stainless hlau sib npaug?
Cov qauv tseem ceeb thoob ntiaj teb yogUNS S32100(US),TS EN 1.4541(Tebchaws Europe), thiabTIAB SA 321. Nws muaj pes tsawg leeg zoo ib yam li 304 tab sis stabilized nrog titanium.
Q: Dab tsi yog 321 stainless hlau siv rau?
Nws yog feem ntau yog siv nyob rau hauv siab -kub daim ntaub ntawv xws li tso pa system, tshav kub exchangers, rauv qhov chaw, boiler Cheebtsam, thiab welded khoom ua hauj lwm siab tshaj 500 degree.
Nqe lus piav qhia thiab kev xaiv
Tam sim no tus nqi lag luam feem ntau muab 304 stainless hlau nyob rau hauv ntau yam$1,650–2,500 ib metric ton, thaum 321 stainless hlau txib a15-20% premium(kwv yees$1,900–3,000 ib metric ton) vim yog titanium ntxiv.
Kev xaiv yuav tsum ua raws li qhov kub thiab txias - thawj txoj hauv kev:
- Rau kev pabcuam txuas ntxiv qis dua 450 degree, 304 muab tus nqi - siv tau thiab txhim khu kev qha.
- Rau kev ua haujlwm ntev tshaj li 500 degree, tshwj xeeb tshaj yog nyob rau hauv thermal cycling los yog corrosive tej yam kev mob, 321 yuav tsum tau teev los xyuas kom meej ntev - lub sij hawm structural kev ncaj ncees thiab kev nyab xeeb.
Peb tshwj xeeb hauv kev muab khoom304 thiab 321 stainless hlau, muab kev cai ua thiab kev xa khoom. Yog xav paub ntxiv cov ntaub ntawv los yog cov qauv thov, thov koj xav tiv tauj peb txhua lub sijhawm.
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