Xaiv ntawm321 thiab 316 stainless hlauxav kom nkag siab txog lawv lub hom phiaj tsim qauv:321 yog optimized rau siab - kub stability, thaum 316 yog engineered rau superior corrosion kuj.Qhov kev xaiv tsis tshua muaj txog qhov twg yog "zoo dua," tab sis txog qhov twgraug rau ib puag ncig kev pabcuam tshwj xeeb.
321 thiab 316 stainless hlau: Qhov txawv yog dab tsi
| Feature | 321 Stainless hlau | 316 Stainless hlau |
|---|---|---|
| Ntsiab Alloying Element | Titanium (Ti)- rau stabilization | Molybdenum (hli) - 2-3% |
| Lub Hom Phiaj Tsim Tseem Ceeb | Siab -Tub & Intergranular Corrosion Resistance | Pitting & Crevice Corrosion Resistance |
| Qhov zoo tshaj plaws kev pab cuam Temp. | Mus txog800-900 degree(hauv kev pabcuam tsis sib xws) | Feem ntau txwv rautxog 870 degree(lub zog degrades) |
| Txhais Lub Zog | Resistance rau rhiab heev thiab lub zog tuav ntawm high kub | Kev tiv thaiv rau chlorides, acids, thiab cov khoom siv tshuaj |
| Tus nqi kim kim | ~ 10-25% saum 304 (vim Ti) | ~ 30-50% saum 304 (vim Mo) |
1. Chemical Composition & Mechanism
321 (NWS S32100): Qhov no yog ibtitanium -stabilizedversion ntawm 304. Lub titanium nyiam khi nrog cov pa roj carbon monoxide, tiv thaiv kev tsim ntawm chromium carbides ntawm cov ciam teb thaum raug rau450-850 degree. Qhov no tiv thaiv "sensitization" thiab tom ntej intergranular corrosion.
316 (NWS S31600): Qhov no yog ibmolybdenum-tau ntxivaustenitic hlau. Molybdenum dramatically txhim kho nws cov tsis kam muspitting thiab crevice corrosion, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj chloride- muaj ib puag ncig (seawater, de-icing ntsev, chemical txheej txheem ntws).
Dab tsi yog 321 stainless hlau sib npaug rau?
321 yog tshuaj lom neeg thiab ua haujlwm ruaj khov ntawm 304, nrog rau cov npe thoob ntiaj teb suav nrogUNS S32100, EN 1.4541 (X6CrNiTi18-10), thiabTIAB SA 321. Nws qhov kev ua tau zoo tshaj plaws analogue yog304, tab sis nws tau tsim tshwj xeeb kom ua tau zoo tshaj 304 nyob rau hauv siab - qhov kub thiab txias qhov xwm txheej yog qhov txaus ntshai.
2. Thaum xaiv 321 Stainless Hlau
Xaiv 321 thaumqhov kub thiab txias yog thawj qhov kev txhawj xeeb. Nws cov txiaj ntsig kev ua tau zoo yog nyob rau hauv500-900℃ntau yam.
Ideal Applications:
Aircraft & automotive tso pa system
Thaum tshav kub kub exchangers, superheaters, boiler qhov chaw
Thermal processing khoom (qhov cub qhov cub)
Welded Cheebtsam uas yuav ua haujlwm ntawm qhov kub thiab txias
Lo lus tseem ceeb: Puas yuav ua haujlwm rau lub sijhawm ntev tshaj li 500℃lossis dhau mus rau kev caij tsheb kauj vab ntau zaus?
Puas yog 321 stainless zoo dua 304?
Tsuas yog hauv cov ntawv thov kub -. Rau kev pabcuam txuas ntxiv lossis cyclic saum toj no500 degree, 321 yog unequivocally zoo dua 304vim nws cov titanium stabilization, uas tiv thaiv weld lwj thiab intergranular corrosion. Rau cov ntawv thov hauv qab no qhov kub thiab txias, tshwj xeeb tshaj yog nyob rau hauv ambient los yog me ntsis corrosive tej yam kev mob,304 muab tus nqi ntau dua - kev daws teeb meem zoonrog ze li zoo tib yam corrosion kuj.
3. Thaum xaiv 316 Stainless Hlau
Xaiv 316 thaumcorrosion, tshwj xeeb tshaj yog los ntawm chlorides, yog thawj qhov kev txhawj xeeb. Nws qhov zoo dua yog ntawmqis rau nruab nrab kubnyob rau hauv ib puag ncig txhoj puab heev.
Ideal Applications:
Marine hardware, ntug hiav txwv architecture
Pharmaceutical, tshuaj, thiab khoom noj khoom haus
Pulp & ntawv ua cov nroj tsuag
Kev kho mob cog thiab cov cuab yeej phais
Lo lus tseem ceeb: Puas yog ib puag ncig acidic, chloride - nplua nuj, los yog corrosive heev?
Qhov twg zoo dua, stainless hlau 310 lossis 316?
Qhov no nyob ntawm ib puag ncig nkaus.310 (25% Cr, 20% Ni)yog asiab -kub alloynrog superior oxidation tsis kam thiab lub zog ntawm kub tshaj1000 degree, tab sis nws tsis tshua muaj corrosion-resistant rau chlorides dua 316.Xaiv 310 rau huab cua sov (piv txwv li, qhov cub tawg). Xaiv 316 rau kev txhoj puab heev tshuaj lom neeg los yog marine ib puag ncig ntawm qhov kub thiab txias.Lawv ua hauj lwm hauv paus ntsiab lus sib txawv.
Puas yog SS 316 zoo dua Super Duplex?
Tsis hais txog lub zog thiab chloride kuj.Super duplex stainless hlau (piv txwv li, UNS S32750)muab ze li ntawmmuab ob npaug rau lub zog tawm losntawm 316 thiab muaj zog ntau dua rau pitting thiab kev nyuaj siab corrosion cracking, tshwj xeeb tshaj yog nyob rau hauv loj offshore thiab tshuaj ib puag ncig. Txawm li cas los xij, lawv muaj aqis tshaj qhov kev pabcuam kub(~ 300 degree) thiab nyuaj rau fabricate.316 yog qhov zoo dua rau kev tsim khoom yooj yim dua thiab tus nqi qis dua hauv cov kev xav tau tsawg.
Puas yog 321 stainless zoo dua 304?
321 tsis yog universally "zoo dua" - nws yog tshwj xeebsuperior rau 304 hauv siab -kub siv. Yog tias koj cov khoom ua haujlwm tsis tu ncua lossis cyclicallysiab tshaj 500 degree, 321 muab kev tiv thaiv tseem ceeb rau intergranular corrosion thiab tuav lub zog zoo dua 304. Txawm li cas los xij, rau kev sivhauv qab 450 degree- tshwj xeeb tshaj yog nyob rau hauv dav dav corrosion los yog tus nqi-sensitive daim ntawv thov - 304 tseem yog qhov kev xaiv pheej yig dua thiab muaj kev ntseeg siab sib npaug. Qhov kev txiav txim siab yog nyob ntawm koj qhov kev pabcuam kub thiab ib puag ncig.
Direct Comparison nyob rau hauv Common Scenarios
| Kev Pabcuam Ib puag ncig | Pom zoo Qib | Kev xav |
|---|---|---|
| Kub tso pa roj (600 degree) | 321 | Kev tiv thaiv zoo tshaj rau oxidation thiab thermal qaug zog. 316 yuav poob lub zog sai sai. |
| Dej hiav txwv / dej hiav txwv | 316 | Far superior pitting resistance. 321 muaj qhov zoo me me tshaj 304 ntawm no. |
| Dilute sulfuric acid ntawm 80 degree | 316 | Molybdenum txhim khu kev tiv thaiv kom txo cov acids. |
| Welded siab lub nkoj rau 650℃kev pabcuam | 321 | Titanium stabilization tiv thaiv weld lwj nyob rau hauv tshav kub- cuam tshuam cheeb tsam. |
| Architectural railing nyob rau hauv ib tug ntug hiav txwv nroog | 316 | Yuav tsum tau tiv thaiv chloride-induced pitting los ntawm ntsev tsuag. |
Xaus: 321 thiab 316 stainless hlau, Txoj Cai Xaiv
Cov ntoo txiav txim siab feem ntau yog ncaj nraim:
Kauj Ruam 1: Ntsuas Kub.Yog kev pabcuam txuas ntxiv lossis cyclicsiab tshaj 500 degree, lean zog rau321.
Kauj Ruam 2: Ntsuas Corrosion.Yog ib puag ncig muajchlorides, muaj zog acids, los yog tshuaj hnyavnyob rau hauv qis kub, nws leans muaj zog mus rau316.
Kauj Ruam 3: Rau Cov Mob hnyav (High Temp + Corrosion Siab).Yog tias ob qho xwm txheej hnyav (piv txwv li, siab- txheej txheem tshuaj kub), tsis yog 321 lossis 316 yuav txaus, thiab siab dua -qib alloy (xws li 310, 904L, lossis npib tsib xee-raws li alloy) yuav tsum raug ntsuas.
Hauv cov ntsiab lus: 321 yog qhov siab - tus kws tshaj lij kub; 316 yog tus corrosion-tus kws tshaj lij.Kev siv lawv tsis raug ua rau ua tsis tiav ntxov. Rau cov ntawv thov tseem ceeb, nco ntsoov sab laj nrog tus kws tsim khoom siv khoom thiab txiav txim siab tiag tiag -kev ntsuas ib puag ncig.
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