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317 stainless hlau phaj yog ib qho austenitic alloy engineered rau ib puag ncig uas cov qhab nias tsuas yog luv luv. Nws cov ntsiab lus siab molybdenum thiab chromium muab kev tiv thaiv zoo tshaj rau pitting, crevice corrosion, thiab chloride nres - ua rau nws cov khoom xaiv rau kev ua tshuaj lom neeg, pulp thiab ntawv, thiab marine daim ntaub ntawv. |
Dab tsi yog 317 Stainless Hlau?
317 stainless hlauyog ib lub siab -kev ua tau zoo austenitic alloy uas muaj qib siab ntawm chromium, npib tsib xee, thiab molybdenum ntau dua li qib 304 lossis 316 ntau dua. Qhov sib ntxiv ntawm tsawg kawg yog 3% molybdenum - piv rau 2% hauv qib 316 - yog nws tus yam ntxwv txhais, ua kom zoo heev rau pitting thiab crevice corrosion nyob rau hauv halide- bearing thiab acidic ib puag ncig.
Nyob rau hauv daim ntawv phaj, 317 yog dav siv los tsim cov hlab ntsha siab, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov tshuab zom zaws, thiab cov txheej txheem txheej txheem uas lub neej ua haujlwm ntev hauv kev tawm tsam yog qhov tseem ceeb. Nws tag nrho austenitic microstructure kuj ua rau nws tsis yog - sib nqus thiab yooj yim weldable yam tsis muaj kev tshaj tawm -weld kho cua sov hauv feem ntau daim ntawv thov.
Tshuaj muaj pes tsawg leeg
Cov tshuaj muaj pes tsawg leeg ntawm 317 stainless hlau phaj ua raws li ASTM A240. Cov ntsiab lus tseem ceeb thiab lawv qhov kev teev tseg yog raws li hauv qab no:
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Lub ntsiab |
Specified Range |
Lub luag haujlwm hauv Kev Ua Haujlwm |
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Chromium (Cr) |
18.0–20.0% |
Passive zaj duab xis tsim; general corrosion kuj |
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Nickel (Ni) |
11.0–15.0% |
Austenite stabilizer; toughness thiab ductility |
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Molybdenum (hli) |
3.0–4.0% |
Pitting thiab crevice corrosion kuj |
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Cov pa roj carbon (C) |
Tsawg dua lossis sib npaug li 0.08% |
Lub zog; tswj kom txo rhiab heev |
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Manganese (Mn) |
Tsawg dua lossis sib npaug li 2.00% |
Austenite stability; deoxidation |
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Silicon (Si) |
Tsawg dua lossis sib npaug li 0.75% |
Deoxidation; siab -kub oxidation kuj |
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Phosphorus (P) |
Tsawg dua lossis sib npaug li 0.045% |
Tswj impurity |
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Sulfur (S) |
Tsawg dua lossis sib npaug li 0.030% |
Tswj impurity |
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Hlau (Fe) |
Tshuav |
Base hlau |
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Cov ntsiab lus 3–4% molybdenum hauv qib 317 yog qhov muaj txiaj ntsig siab dua li 2–3% pom hauv qib 316. Qhov sib txawv no ncaj qha txhais mus rau ntau dua Pitting Resistance Equivalent Number (PREN), muab ntsuas zoo dua tiv thaiv cov tshuaj chloride-induced pitting - ib qho ntawm cov khoom siv hlau tsis zoo. |
Mechanical Properties
317 stainless hlau phaj nyob rau hauv annealed mob raws li nram no yam tsawg kawg nkaus txhua yam yuav tsum tau rau ASTM A240:
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Tensile zog Ntau dua lossis sib npaug li 515 MPa (Ntau dua lossis sib npaug rau 75 ksi) |
Lub zog muaj zog (0.2%) Ntau dua lossis sib npaug li 205 MPa (Ntau dua lossis sib npaug rau 30 ksi) |
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Elongation Ntau dua lossis sib npaug li 40% hauv 50mm gauge |
Hardness (Brinell) Tsawg dua lossis sib npaug rau 217 HB Rockwell Tsawg dua lossis sib npaug rau 95 HRB |
Cov txiaj ntsig no cuam tshuam txog qhov annealed (kev daws teeb meem-kho) kev xa khoom. Zoo li txhua yam austenitic stainless hlau, qib 317 tsis tuaj yeem hardened los ntawm kev kho cua sov - lub zog nce yog ua tiav los ntawm kev ua haujlwm txias. Tus nqi elongation siab (Ntau dua lossis sib npaug li 40%) lees paub qhov zoo tshaj plaws ductility, uas yooj yim rau kev tsim, khoov, thiab xovxwm ua haujlwm thaum tsim khoom.
Lub cev muaj zog
|
Khoom |
Tus nqi |
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Qhov ntom |
7.98 g / cm³ (0.288 lb / hauv³) |
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Melting Range |
1375-1400℃(2507-2552℃F) |
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Thermal conductivity (ntawm 100 degree) |
~14.4 W/(m·K) |
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Coefficient ntawm Thermal Expansion |
16.5 µm / (m· degree) (20-100 degree) |
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Hluav taws xob Resistivity |
~740 nΩ·m |
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Modulus ntawm Elasticity |
193 GPa (28,000 ksi) |
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Sib nqus Permeability |
Tsis yog -magnetic (µ ≈ 1.02) |
Corrosion Resistance
Corrosion tsis kam yog qhov txhais kom zoo dua ntawm 317 stainless hlau phaj, thiab nws yog ncaj qha mus rau lub alloy lub siab molybdenum cov ntsiab lus.
Pitting thiab Crevice Corrosion
Qib 317 ua tiav Pitting Resistance Equivalent Number (PREN) ntawm kwv yees li 30–33, piv rau ib ncig ntawm 25–27 rau qib 316. Qhov siab dua PREN txhais tau hais tias cov khoom tuaj yeem tiv taus cov tshuaj chloride ntau dua thiab kub ua ntej pitting pib. Qhov no ua rau 317 phaj zoo haum rau cov khoom siv tuav cov dej hiav txwv, cov brine, cov tshuaj bleaching, thiab chloride- muaj cov txheej txheem ntws.
Acid thiab Txo Ib puag ncig
Molybdenum kuj tseem txhim kho kev tiv thaiv kom tsis txhob muaj cov kua qaub, tshwj xeeb tshaj yog sulfuric acid ntawm qhov nruab nrab thiab phosphoric acid. Qib 317 ua tau zoo tshaj 304 thiab 316 nyob rau hauv cov cheeb tsam no, muab cov kev pab cuam ntev dua thiab txo qis txij nkawm.
Siab -Tub kub oxidation
317 stainless hlau tuav nws cov txheej txheem oxide tiv thaiv txog li 870℃(1600℃F) hauv kev pabcuam txuas ntxiv. Rau cov kev pabcuam sib cuam tshuam, qhov kev ua haujlwm siab tshaj plaws yog nyob ib puag ncig 925℃(1700℃F). Tshaj li qhov kub thiab txias no, kev hnov mob lossis qhov ntsuas yuav tshwm sim, thiab siab dua - qib alloy yuav tsum raug txiav txim siab.
317 vs 316 Stainless hlau: Qhov txawv tseem ceeb
Engineers nquag ntsib qhov kev xaiv ntawm 317 thiab 316 phaj. Ob leeg yog cov qhab nia zoo austenitic, tab sis lawv cov hnab ntawv kev ua tau zoo sib txawv hauv cov ntsiab lus:
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Qib 316 - 2-3% molybdenum – PREN approx . 25–27 - Cov khoom siv qis dua - Kev muaj dav thoob ntiaj teb - Haum rau cov tshuaj chloride tsawg - Zoo dav dav corrosion kuj |
Qib 317 - 3-4% molybdenum – PREN approx . 30–33 - Tus nqi pib siab dua - Superior hauv kev txhoj puab heev chloride kev pabcuam - Zoo dua tiv thaiv kom txo cov acids - Nyiam rau tshuaj thiab pulp / ntawv cog |
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Thaum cov kev ua haujlwm cuam tshuam nrog cov tshuaj chloride kub, dilute sulfuric acid, los yog tshuaj dawb -muaj cov kwj deg, cov molybdenum ntxiv hauv 317 feem ntau ua rau tus nqi zoo tshaj - tsis yog ntawm kev ua haujlwm xwb, tab sis los ntawm kev txo cov nqi hloov thiab cov nqi qis dua ntawm cov khoom siv lub neej. |
Fabrication thiab Weldability
317 stainless hlau phaj yog npaj txhij siv cov txheej txheem austenitic. Cov txheej txheem tseem ceeb suav nrog:
Vuamyog ua los ntawm kev siv cov khoom sib txuam xws li ER317L (rau cov txheej txheem MIG / TIG) lossis E317L electrodes. Qhov qis -carbon "L" muab tub lim variants tau pom zoo kom txo qis carbide nag lossis daus hauv tshav kub- thaj chaw cuam tshuam, khaws cia corrosion kuj nyob ze ntawm qhov vuam seam. Post-weld annealing tsis tas yuav tsum tau siv rau feem ntau cov phaj thicknesses thaum L- qib muab tub lim siv.
Kev ua haujlwm txias txias- dabtsi yog khoov, dov, nias tsim - raug tua siv tib yam khoom siv li 316, txawm tias qhov nyiaj yuav tsum tau ua rau qib 317 qhov ua haujlwm siab dua me ntsis- hardening rate. Machining yuav tsum tau siv cov cuab yeej ntse, nruab nrab txiav nrawm, thiab cov khoom ua kom txias kom tsis txhob ua hauj lwm nyuaj ntawm qhov txiav.
Tej kev siv
317 stainless hlau phaj tau teev nyob rau txhua qhov chaw ntawm qib 316 phaj yuav yog marginal - tshwj xeeb tshaj yog nyob rau hauv ib puag ncig sib txuas chlorides, acids, thiab siab kub. Cov ntawv thov sawv cev muaj xws li:
Cov txheej txheem tshuaj lom neeg cov hlab ntsha
Pulp thiab ntawv digesters
Flue gas desulfurization
Seawater tshav kub exchangers
Bleach cog khoom siv
Pharmaceutical reactors
Offshore platform decking
Sulfuric acid tuav
Dye thiab textile cog
Cov khoom siv ua zaub mov
Marine tso pa system
Cov hlab ntsha siab
Muaj Cov Qauv thiab Cov Qauv
317 stainless hlau phaj yog ua raws li cov qauv tseem ceeb hauv qab no. Ib txwm thov cov ntawv pov thawj zeb xeem (MTRs) lees paub ua raws li cov lus qhia tshwj xeeb:
|
Txuj |
Scope |
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ASTM A 240 Cov Lus Qhia |
Chromium thiab chromium-nickel stainless hlau phaj, ntawv, thiab sawb rau cov hlab ntsha siab |
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ASTM A 480 Cov Lus Qhia Tshwj Xeeb |
Cov kev cai dav dav rau lub tiaj- dov stainless hlau phaj, ntawv, thiab sawb |
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ASME SA-240 |
ASME siab hlab ntsha code sib npaug ntawm ASTM A240 |
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TS EN 10028-7 |
Cov khoom lag luam nyob sab Europe tiaj tus rau lub hom phiaj siab - stainless hlau |
Cov lus nug nquag
Q: Puas yog 317 stainless hlau zoo dua 316?
A: Hauv ib puag ncig uas muaj cov tshuaj chloride ntau dua, txo cov kua qaub, lossis cov tshuaj lom neeg muaj zog ntau dua, yog - 317 ua tau zoo tshaj 316 vim nws cov ntsiab lus molybdenum siab dua. Rau cov ntawv thov txheej txheem nrog rau qhov nruab nrab corrosive raug, 316 feem ntau txaus thiab pheej yig dua.
Q: Dab tsi yog 317L stainless hlau?
A: 317L yog qhov qis-carbon version ntawm qib 317, nrog cov pa roj carbon txwv rau 0.03% siab tshaj plaws. Cov ntsiab lus qis dua yuav txo tau qhov kev pheej hmoo ntawm rhiab heev (carbide nag lossis daus ntawm cov ciam teb) thaum lub sij hawm vuam, khaws cia corrosion kuj nyob rau hauv tshav kub- cuam tshuam cheeb tsam yam tsis tas yuav post-weld annealing.
Q: Puas yog 317 stainless hlau hlau nplaum?
A: Nyob rau hauv cov mob annealed, 317 stainless hlau yog qhov tseem ceeb tsis yog -magnetic (magnetic permeability ≈ 1.02). Kev ua haujlwm txias tuaj yeem ua rau me me ntawm deformation-induced martensite, ua rau thaj chaw ua haujlwm hnyav me ntsis sib nqus - tab sis cov khoom tseem tsis tshua muaj hlau nplaum tsawg dua qib ferritic lossis martensitic stainless.
Q: 317 stainless hlau phaj tuaj yeem siv rau qhov kub thiab txias?
A: Qib 317 tuaj yeem siv ua haujlwm txuas ntxiv mus txog li 870℃(1600℃F). Rau qhov kub tshaj qhov no, cov nag lossis daus ntawm carbide (ib puag ncig 425-870 degree) yuav tsum tau muab tso rau hauv kev tsim - siv 317L los yog qhia cov tshuaj annealing tom qab fabrication mitigates rhiab heev ntawm qhov no.
Kev lees paub: Cov ntaub ntawv nthuav tawm hauv daim ntawv no yog ua raws li tus qauv tsim thiab cov khoom sib txawv ntawm ASTM A240 thiab cov khoom siv hauv kev lag luam. Cov khoom tiag tiag yuav txawv ntawm qhov kub, cov khoom tsim, thiab kev ua haujlwm. Txhua daim ntawv thov tseem ceeb yuav tsum hais txog cov qauv siv tam sim no thiab cov ntaub ntawv pov thawj cov ntaub ntawv xeem. Cov ntsiab lus no yog npaj rau kev taw qhia dav dav engineering nkaus xwb.
