316 Stainless Hlau Molybdenum{1}}Cov

316 yog ib qho classic molybdenum- muaj cov austenitic stainless hlau, hloov kho dua tshiab ntawm 304 nrog kev txhim kho corrosion. Qhov sib ntxiv ntawm molybdenum ho txhim kho nws cov kev tiv thaiv rau pitting thiab crevice corrosion nyob rau hauv chloride ib puag ncig, ua rau nws nyiam cov khoom siv rau hnyav corrosion scenarios.

Chemical Composition (wt%): C Less dua los yog sib npaug rau 0.08, Cr=16.00-18.00, Ni=10.00-14.00, Mo=2.00-3.00, Si Less dua los yog sib npaug rau 1.00, Mn Less dua los yog sib npaug rau 2.00, P Less dua los yog sib npaug rau 0.045, S Less dua los yog sib npaug rau 0.030, Fe{{8}

Mechanical Properties (Annealed): Tensile Strength Ntau dua los yog sib npaug rau 515MPa, Yield Strength Ntau dua lossis sib npaug rau 205MPa, Elongation Ntau dua lossis sib npaug li 40%, Hardness Tsawg dua lossis sib npaug rau 217HB

Kev Ua Haujlwm Zoo: Zoo heev rau pitting thiab crevice corrosion nyob rau hauv chloride ib puag ncig (PREN≈25); zoo corrosion kuj nyob rau hauv seawater, saline tov thiab qaug zog acid / alkali ib puag ncig; Kev pabcuam dav dav (-196℃txog 870 degree); zoo heev formability thiab weldability.

Daim ntawv thov: Marine hardware, nkoj lawj Cheebtsam, seawater txias pipelines, tsis muaj zog corrosive nruab nrab thauj pipelines nyob rau hauv petrochemical kev lag luam, saline zaub mov ua khoom, ntug dej hiav txwv tsev sab nrauv hniav qhov chaw.

Qib sib npaugTom ntej: UNS S31600, JIS SUS316, EN 1.4401, GB 06Cr17Ni12Mo2

Q&A

Q1: Vim li cas 316 yog qhov tsim nyog rau cov ntug dej hiav txwv ntau dua 304? A1: 316 yog qhov tsim nyog rau thaj chaw ntug dej hiav txwv ntau dua li 304 feem ntau vim yog qhov sib ntxiv ntawm molybdenum (2.00-3.00wt%), uas txhim kho nws cov tshuaj tiv thaiv chloride corrosion. Cov ntug dej hiav txwv ib puag ncig muaj cov tshuaj chloride ions los ntawm cov dej hiav txwv thiab ntsev tsuag, uas yooj yim tua cov oxide zaj duab xis ntawm cov hlau tsis huv, ua rau pitting thiab crevice corrosion. 304's oxide zaj duab xis yog qhov tsis ruaj khov nyob rau hauv high-chloride ib puag ncig, ua rau xeb thiab corrosion nyob rau hauv 1-2 xyoos. Nyob rau hauv sib piv, molybdenum nyob rau hauv 316 txhawb kev tsim ntawm ib tug ntau ntom thiab ruaj khov passivation zaj duab xis, uas muaj peev xwm tiv taus chloride ion nkag mus. Pitting kuj sib npaug (PREN) ntawm 316 yog kwv yees li 25, ntau dua 304's PREN ntawm 18, qhia tias muaj zog pitting corrosion kuj. Tsis tas li ntawd, 316 muaj cov ntsiab lus ntau dua npib tsib xee, uas txhim kho kev ruaj ntseg ntawm cov qauv austenitic thiab ntxiv txhim kho corrosion kuj nyob rau hauv ib puag ncig hnyav.

Q2: Qhov txawv ntawm corrosion kuj ntawm 316 thiab 304 hauv seawater yog dab tsi? A2: Cov corrosion kuj ntawm 316 thiab 304 nyob rau hauv seawater txawv heev. Hauv dej hiav txwv zoo li qub, 304 tus nqi corrosion ntau tshaj 0.5mm / xyoo, thiab nws yuav muaj kev pom tseeb pitting thiab crevice corrosion nyob rau hauv ib lub sij hawm luv luv, ua rau nws tsis haum rau ntev -siv seawater immersion daim ntaub ntawv. Hauv qhov sib piv, 316 tus nqi corrosion nyob rau hauv cov dej hiav txwv zoo li qub yog tsawg dua 0.1 hli / xyoo, ua kom nws muaj kev ruaj ntseg rau lub sijhawm ntev. Qhov sib txawv no feem ntau yog vim 316 cov ntsiab lus molybdenum; molybdenum tuaj yeem tsim molybdenum{15}}nplua nuj oxide zaj duab xis rau ntawm qhov chaw, uas tiv taus chloride ion yaig ntau dua li 304's chromium oxide zaj duab xis. Hauv dej hiav txwv ntws, qhov kev tiv thaiv corrosion ntawm ob qho tib si tau txhim kho, tab sis 316 tseem muaj qhov zoo dua. Rau cov khoom siv dej hiav txwv desalination lossis marine Cheebtsam uas yuav tsum tau siv sijhawm ntev hauv dej hiav txwv, 316 yog cov khoom nyiam, thaum 304 tsuas yog tsim rau luv luv -lub sijhawm lossis zoo- dej hiav txwv tiv thaiv- hais txog daim ntawv thov.

Q3: Cov khoom siv vuam zoo li cas rau 316 stainless hlau? A3: Cov khoom siv vuam tsim nyog rau 316 stainless hlau feem ntau yog ER316L vuam hlau thiab E316L electrodes. ER316L vuam hlau yog qhov zoo dua rau cov roj tungsten arc vuam (GTAW) thiab roj hlau arc vuam (GMAW) vim nws muaj cov tshuaj sib xyaw nrog 316, tshwj xeeb tshaj yog tib cov ntsiab lus molybdenum, kom ntseeg tau tias cov vuam muaj tib yam corrosion kuj thiab txhua yam khoom raws li lub hauv paus hlau. Qhov "L" hauv ER316L qhia tias cov ntsiab lus qis qis (tsawg dua lossis sib npaug li 0.03wt%), uas tuaj yeem zam kev cuam tshuam ntawm intergranular corrosion nyob rau hauv vuam tshav kub- cuam tshuam cheeb tsam. Thaum vuam tuab daim hlau (Ntau dua lossis sib npaug li 10mm) lossis cov khoom siv hauv qhov hnyav corrosion, tom qab-weld annealing ntawm 850-900℃yog pom zoo kom tshem tawm cov kev ntxhov siab thiab ntxiv dag zog rau corrosion. Nws yog ib qho tseem ceeb kom tsis txhob siv cov khoom siv vuam tsim rau 304 (xws li ER308L) rau 316, vim qhov no yuav txo tau cov ntsiab lus molybdenum ntawm cov vuam, ua rau tsis zoo corrosion kuj.

Q4: Dab tsi yog qhov kev pabcuam kub ntawm 316 stainless hlau? A4: Qhov kev pabcuam kub tsis tu ncua ntawm 316 stainless hlau yog -196℃rau 870 degree, uas zoo ib yam li 304, tab sis nws muaj kev ruaj ntseg zoo dua hauv qhov kub siab -kub corrosive ib puag ncig. Ntawm ultra- kub qis qis mus rau -196 degree, 316 tuav lub zog zoo heev, haum rau lub tank cia cryogenic thiab qis -kub thauj cov kav dej uas muaj cov xov xwm corrosive. Thaum kub siab txog 870 degree, nws tuaj yeem tiv taus oxidation hauv oxidizing cua; Txawm li cas los xij, nyob rau hauv siab - qhov kub thiab txias txo qhov cua (xws li hydrogen- roj nplua nuj), nws cov corrosion kuj tsis zoo. Piv rau 304, 316 muaj qhov zoo dua siab -kub corrosion kuj nyob rau hauv ib puag ncig uas muaj chloride ions lossis sulfur dioxide. Nws yuav tsum raug sau tseg tias thaum qhov kev pabcuam kub siab tshaj 870 degree, oxide zaj duab xis ntawm 316 yuav tsis ruaj khov, thiab siab -chromium-nickel qib xws li 309S yuav tsum tau xaiv rau lub sijhawm ntev - kev pabcuam. Tsis tas li ntawd, 316 lub siab - qhov kub thiab txias creep zog yog zoo ib yam li ntawm 304, yog li nws tsis haum rau qhov kub thiab txias-kev coj tus kheej cov khoom.

Q5: Vim li cas 316 kim dua 304, thiab nws puas tsim nyog tus nqi ntxiv? A5: 316 yog 30-40% kim dua 304 feem ntau vim nws cov ntsiab lus ntau dua nickel thiab molybdenum. Nickel thiab molybdenum yog kim alloying ntsiab; 316's nickel cov ntsiab lus (10.00-14.00wt%) yog siab dua 304's (8.00-10.50wt%), thiab nws kuj muaj 2.00-3.00wt% molybdenum, uas 304 tsis muaj. Seb tus nqi ntxiv puas tsim nyog nws nyob ntawm daim ntawv thov ib puag ncig. Nyob rau hauv ib puag ncig uas tsis muaj corrosion xws li dej tshiab, huab cua qhuav, lossis kho kom zoo nkauj sab hauv tsev, 304 txaus, thiab siv 316 yuav yog qhov tsis tsim nyog. Txawm li cas los xij, nyob rau hauv qhov chaw muaj kev cuam tshuam loj xws li thaj chaw ntug dej hiav txwv, dej hiav txwv, dej ntsev, lossis cov tshuaj lom neeg uas muaj cov tshuaj chloride ions, 316 qhov kev tiv thaiv zoo tshaj plaws tuaj yeem ua kom ntev lub neej kev pab cuam ntawm cov khoom, txo cov nqi tu, thiab zam kev nyab xeeb los ntawm corrosion tsis ua hauj lwm. Piv txwv li, nyob rau hauv seawater cooling pipelines, 316 lub neej kev pab cuam yog 5-8 npaug ntawm 304, ua rau tus nqi ntxiv tsim nyog rau cov xwm txheej zoo li no.