904L yog cov hlau tsis xeb uas tsis ruaj khov uas muaj cov pa roj carbon tsawg thiab cov hlau sib xyaw ua ke ntau. Qhov ntxiv tooj liab rau qib no ua rau nws tiv taus cov kua qaub uas muaj zog heev, tshwj xeeb yog cov kua qaub sulfuric. Nws kuj tiv taus cov tshuaj chloride tawm tsam - ob qho tib si xeb pitting / crevice thiab xeb tawg.
Qib no tsis yog hlau nplaum nyob rau hauv txhua qhov xwm txheej thiab muaj kev sib txuas zoo heev thiab kev ua kom zoo. Cov qauv austenitic kuj muab qib no zoo heev toughness, txawm tias mus txog rau qhov kub cryogenic.
904L muaj cov ntsiab lus tseem ceeb ntawm cov khoom xyaw kim heev nickel thiab molybdenum. Ntau daim ntawv thov uas qib no tau ua tiav zoo yav dhau los tam sim no tuaj yeem ua tiav ntawm tus nqi qis dua los ntawm duplex stainless hlau 2205 (S31803 lossis S32205), yog li nws siv tsawg dua li yav dhau los.
Cov Khoom Tseem Ceeb
Cov khoom no tau teev tseg rau cov khoom tiaj tiaj (phaj, ntawv thiab kauj) hauv ASTM B625. Cov khoom zoo sib xws tab sis tsis tas yuav zoo ib yam tau teev tseg rau lwm cov khoom xws li yeeb nkab, raj thiab bar hauv lawv cov lus qhia.
Kev sau ua ke
Rooj 1.Cov khoom sib xyaw ua ke rau qib 904L ntawm cov hlau tsis xeb.
| Qib | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | feeb. siab tshaj plaws. | - 0.020 | - 2.00 | - 1.00 | - 0.045 | - 0.035 | 19.0 23.0 | 4.0 5.0 | 23.0 28.0 | 1.0 2.0 |
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Cov Khoom Siv Kho Tshuab
Rooj 2.Cov khoom siv kho tshuab ntawm 904L qib stainless hlau.
| Qib | Lub zog Tensile (MPa) feeb | Lub zog tawm los 0.2% pov thawj (MPa) feeb | Kev ntev (% hauv 50 hli) feeb | Qhov nyuaj | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 feem pua | - |
| Tus nqi Rockwell Hardness tsuas yog ib txwm muaj; lwm cov nqi yog cov kev txwv tshwj xeeb. | |||||
Cov Khoom Siv Lub Cev
Rooj 3.Cov khoom siv lub cev ib txwm muaj rau 904L qib stainless hlau.
| Qib | Qhov Ceev | Modulus Elastic | Qhov Nruab Nrab Co-efficient ntawm Thermal Expansion (µm/m/°C) | Kev Ua Kub | Kub Tshwj Xeeb 0-100 ° C | Kev Tiv Thaiv Hluav Taws Xob | |||
| 0-100°C | 0-315°C | 0-538°C | Thaum 20°C | Thaum 500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Kev Sib Piv Txog Qib Kawm
Rooj 4.Cov lus qhia txog qib rau 904L stainless hlau.
| Qib | UNS No | Cov neeg Askiv qub | Euronorm | Swedish SS | Nyiv JIS | ||
| BS | En | No | Lub Npe | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Cov kev sib piv no tsuas yog kwv yees xwb. Daim ntawv teev npe no yog tsim los ua kev sib piv ntawm cov khoom siv zoo sib xws.tsis yogua ib daim ntawv teev cov khoom sib npaug ntawm daim ntawv cog lus. Yog tias xav tau cov khoom sib npaug tiag tiag, yuav tsum tau sab laj nrog cov lus qhia thawj. | |||||||
Cov Qib Lwm Yam Uas Muaj Peev Xwm Hloov Tau
Rooj 5.Tej zaum yuav muaj lwm cov qib sib txawv rau 904L stainless hlau.
| Qib | Vim li cas nws thiaj yuav raug xaiv es tsis yog 904L |
| 316L | Ib txoj kev xaiv pheej yig dua, tab sis nrog kev tiv thaiv corrosion qis dua. |
| 6Mo | Yuav tsum muaj kev tiv thaiv corrosion ntau dua rau pitting thiab crevice. |
| 2205 | Kev tiv thaiv xeb zoo sib xws, nrog rau 2205 muaj lub zog kho tshuab siab dua, thiab tus nqi qis dua rau 904L. (2205 tsis haum rau qhov kub siab tshaj 300 ° C.) |
| Super duplex | Yuav tsum muaj kev tiv thaiv corrosion ntau dua, ua ke nrog lub zog siab dua 904L. |
Kev Tiv Thaiv Kev Xeb
Txawm hais tias thawj zaug tsim los rau nws txoj kev tiv thaiv rau sulfuric acid nws kuj muaj kev tiv thaiv siab heev rau ntau yam ib puag ncig. PRE ntawm 35 qhia tau hais tias cov khoom siv muaj kev tiv thaiv zoo rau dej hiav txwv sov thiab lwm yam chloride ib puag ncig. Cov ntsiab lus nickel siab ua rau muaj kev tiv thaiv zoo dua rau kev ntxhov siab corrosion cracking dua li cov qauv austenitic. Tooj liab ntxiv kev tiv thaiv rau sulfuric thiab lwm yam txo cov kua qaub, tshwj xeeb tshaj yog nyob rau hauv qhov "nruab nrab concentration" ntau heev.
Hauv feem ntau ib puag ncig 904L muaj kev ua haujlwm corrosion nruab nrab ntawm tus qauv austenitic qib 316L thiab cov alloyed heev 6% molybdenum thiab cov qib "super austenitic" zoo sib xws.
Hauv cov kua qaub nitric acid uas ua rau tawv tawv, 904L muaj kev tiv thaiv tsawg dua li cov qib tsis muaj molybdenum xws li 304L thiab 310L.
Rau qhov siab tshaj plaws kev ntxhov siab corrosion cracking tiv thaiv nyob rau hauv qhov chaw tseem ceeb cov hlau yuav tsum tau kho tom qab ua haujlwm txias.
Kev Tiv Thaiv Kub
Zoo tiv taus oxidation, tab sis zoo li lwm cov qib alloyed siab raug kev txom nyem los ntawm kev tsis ruaj khov ntawm cov qauv (nag ntawm cov theem brittle xws li sigma) ntawm qhov kub siab. 904L yuav tsum tsis txhob siv siab tshaj li 400 ° C.
Kev Kho Mob Kub
Kev Kho Mob Kua (Annealing) - cua sov rau 1090-1175 ° C thiab txias sai. Qib no tsis tuaj yeem ua kom tawv los ntawm kev kho cua sov.
Kev vuam
904L tuaj yeem vuam tau zoo los ntawm txhua txoj kev txheem. Yuav tsum tau ceev faj vim tias qib no khov kho tag nrho austenitic, yog li nws yooj yim rau kev tawg kub, tshwj xeeb tshaj yog nyob rau hauv cov vuam txwv tsis pub. Tsis tas yuav siv cua sov ua ntej thiab feem ntau tom qab vuam kev kho cua sov kuj tsis tas yuav tsum tau. AS 1554.6 ua ntej qib 904L rods thiab electrodes rau kev vuam ntawm 904L.
Kev Tsim Khoom
904L yog qib purity siab, qib sulfur tsawg, thiab yog li ntawd yuav tsis tshuab tau zoo. Txawm li cas los xij, qib no tuaj yeem tshuab tau siv cov txheej txheem txheem.
Kev khoov rau qhov me me yog qhov yooj yim ua tiav. Feem ntau qhov no ua tiav txias. Tom qab ntawd annealing feem ntau tsis tas yuav tsum tau, txawm hais tias nws yuav tsum tau xav txog yog tias kev tsim khoom yuav tsum tau siv rau hauv ib puag ncig uas muaj kev ntxhov siab hnyav corrosion cracking tej yam kev mob yuav tshwm sim.
Cov ntawv thov
Cov ntawv thov ib txwm muaj xws li:
• Lub chaw ua cov kua qaub sulfuric, phosphoric thiab acetic
• Kev ua cov ntawv thiab cov khoom siv ua los ntawm cov khoom siv pulp
• Cov khoom siv hauv cov chaw ntxuav roj
• Cov khoom siv txias dej hiav txwv
• Cov khoom siv hauv chaw ua roj
• Cov xov hlau hauv cov electrostatic precipitators
