SUS321 vs 304: Yuav ua li cas titanium Alloying txhim kho siab -Qhov Kub Ua Haujlwm
Apr 14, 2025
Tso lus
SUS321 thiab SUS304 hauv tsev neeg Austenitic
SUS321 thiab SUS304 yog ob qho tib si austenitic stainless hlau txhais los ntawm JIS G4303 thiab G4304, thiab lawv tshwm sim zoo sib xws thaum xub thawj siab ib muag. Qhov kev txiav txim siab sib txawv yog titanium: SUS321 nqa titanium ntxiv ntawm tsawg kawg tsib zaug cov ntsiab lus carbon, feem ntau 0.4 txog 0.8 feem pua, thaum SUS304 tsis muaj titanium. Vim tias titanium muaj kev sib raug zoo rau cov pa roj carbon ntau dua li cov chromium, nws tsim cov titanium carbides ruaj khov thiab tawm chromium hauv cov tshuaj, tiv thaiv cov ciam teb. Thoob ntiaj teb, SUS321 sib raug rau UNS S32100, EN 1.4541 (X6CrNiTi18-10) thiab GB 06Cr18Ni11Ti, thaum SUS304 sib raug rau UNS S30400, EN 1.4301 (X510CrN9.
Cov khoom xyaw: Lub luag haujlwm ntawm Titanium
Cov lus piv txwv muaj pes tsawg leeg rau JIS G4303. Ob qib sib koom tib lub qab nthab, tab sis tsuas yog SUS321 tshwj xeeb titanium, uas kaw cov pa roj carbon monoxide thiab tiv thaiv chromium depletion ntawm qhov kub thiab txias.
| Element | SUS 321 | SUS 304 |
|---|---|---|
| Cov pa roj carbon, max | 0.08 | 0.08 |
| Silicon, max | 1.00 | 1.00 |
| Manganese, max | 2.00 | 2.00 |
| Phosphorus, max | 0.045 | 0.045 |
| Sulfur, max | 0.030 | 0.030 |
| Nickel | 9.00-13.00 | 8.00-10.50 |
| Chromium | 17.00-19.00 | 18.00-20.00 |
| Titanium | 5 x c,mav | - |
High -Tsub Kev Ua Haujlwm
EN 10095, European tus qauv rau cua sov- tiv thaiv steels, teev qhov siab tshaj plaws kev pabcuam kub hauv huab cua ntawm 850 degrees C rau 1.4541 piv nrog 800 degrees C rau 1.4301, qhia txog qib ruaj khov zoo dua rau oxidation thiab nplai spalling. Lub titanium-stabilized qauv kuj qeeb carbide coarsening thiab sigma-theem embrittlement, yog li SUS321 tuav lub zog ntev dua nyob rau hauv kev txhawb nqa load. Tshaj tawm cov ntaub ntawv creep-cov ntaub ntawv tawg uas feem ntau hais rau cov qhab nia no qhia SUS321 khaws cia kwv yees li 60 MPa ntawm 700 degrees C rau 1000 teev piv txog li 40 MPa rau SUS304 nyob rau hauv tib lub sijhawm; cov no yog cov ntaub ntawv tseem ceeb rau kev sib piv thiab yuav tsum tau lees paub tiv thaiv cov ntaub ntawv tsim tawm tam sim no lossis cov cai tso cai, xws li ASME Tshooj II, ua ntej tsim.
Intergranular Corrosion thiab Weldability
Thaum twg qib yog tuav nyob rau hauv qhov rhiab heev ntawm li 450 mus rau 850 degrees C, carbon tuaj yeem precipitate li chromium carbide ntawm grain ciam teb, depleting chromium nyob ib sab thiab ua rau cov khoom raug cuam tshuam rau intergranular corrosion. Hauv SUS321 cov titanium carbides tsim ua ntej, yog li chromium tseem nyob rau hauv kev daws thiab cov khoom siv tiv thaiv zoo rau qhov kev tawm tsam no, txawm tias nyob rau hauv cov cua sov- cuam tshuam cheeb tsam thiab nyob rau hauv ntev - lub sij hawm siab - kub kev pab cuam. Raws li qhov tshwm sim, SUS321 yuav tsum tsis muaj kev tshaj tawm -weld solution annealing, uas ua kom yooj yim ntawm kev tsim cov welded loj xws li cov raj rauv thiab cov cua sov- cov nplooj ntawv sib hloov raj. SUS304, los ntawm qhov sib txawv, tej zaum yuav xav tau kev daws teeb meem ntawm 1050 ° C nrog dej quenching tom qab vuam, los yog hloov qis -carbon SUS304L nrog carbon 0.030 feem pua siab tshaj plaws.
Daim Ntawv Thov Scenarios thiab Cov Lus Qhia Xaiv
SUS321 yog qhov kev xaiv ntuj uas qhov kev ua haujlwm kub siab tshaj li 500 ° C, qhov twg muaj kev ntxhov siab siab - qhov kub thiab txias, los yog qhov chaw welded complex tsis tuaj yeem daws tau yooj yim -annealed. Cov ntawv thov muaj xws li catalytic cracking unit Cheebtsam nyob rau hauv 600 mus rau 800 degrees C ntau yam, annealing - cubes muffle tubes nyob rau hauv oxidising atmospheres, siab - kub kub- exchanger tube sheets, thiab chav piping nyob rau hauv fais fab nroj tsuag. SUS304 tseem yog tus nqi- cov khoom siv tau zoo rau cov kav dej dav dav rau cov kua qaub thiab alkali qis dua 450 degrees C, chav-kub condensate kab, LNG cia ntawm qhov kub thiab txias, thiab tsis yog{15}} cov khoom siv tseem ceeb txhawb nqa. Rau chloride- thaj chaw nplua nuj xws li dej hiav txwv, tsis muaj qib zoo; molybdenum{18}}cov kabmob SUS316 lossis siab dua- cov qib alloyed yuav tsum raug xaiv.
Cov lus nug nquag
Q1. titanium ua dab tsi hauv SUS321?
Titanium nyiam tsim cov carbides ruaj khov, tiv thaiv chromium-carbide nag lossis daus ntawm cov ciam teb nplej thiab tshem tawm cov kev cuam tshuam ntawm intergranular thiab chromium depletion ntawm qhov kub thiab txias.
Q2. SUS321 puas tuaj yeem siv siab dua 850 degrees C?
EN 10095 teev 850 degrees C raws li qhov ntsuas kub siab tshaj plaws hauv huab cua rau 1.4541; saum toj no, oxidation thiab poob ntawm mechanical zog ceev ceev.
Q3. Puas yog SUS321 xav tau kev tshaj tawm - vuam cua sov?
Tsis yog. Lub titanium stabilization ua kom lub vuam kub - cuam tshuam rau thaj tsam tiv thaiv kev puas tsuaj, yog li kev daws teeb meem tom qab vuam tsis tas yuav tsum tau ua.
Q4. Puas yog SUS321 kim dua SUS304?
Yog lawm, vim yog titanium ntxiv thiab kev tswj nruj dua. Tus nqi yog tsim nyog rau qhov siab - kub lossis welded kev pabcuam xav tau kev ruaj khov.
Q5. Qhov twg zoo dua rau dej hiav txwv, SUS321 lossis SUS304?
Tsis yog. Ob leeg tsis muaj molybdenum; siv SUS316 lossis qib duplex rau chloride lossis marine ib puag ncig.
Q6. Dab tsi yog qhov sib npaug ntawm SUS321?
UNS S32100, EN 1.4541 (X6CrNiTi18-10), GB 06Cr18Ni11Ti, thiab hauv cov lus Askiv qub 321S31 lossis zoo sib xws rau cov qauv tsim nyog.
Xa kev nug