Stainless hlau 317L (UNS S31703, EN 1.4438)yog ib qho qis-carbon, molybdenum-cov kabmob austenitic stainless hlau uas muaj kev tiv thaiv corrosion zoo dua piv rau qib 316L. Qhov "L" sawv cev rau "tsawg carbon" (Less tshaj lossis sib npaug li 0.03%), uas tiv thaiv kev tsim cov chromium carbides tsis zoo thaum vuam - tshem tawm qhov xav tau tom qab- vuam cua sov kho.
Kab lus no qhia txog 317L steel phaj muaj pes tsawg leeg, kev kho cua sov, kev siv tshuab thiab lub cev, thiab kev siv.
Chemical Composition ntawm 317L Steel Phaj
Cov lus hauv qab no qhia txog cov tshuaj muaj pes tsawg leeg rau 317L raws li ASTM A240.
|
Element |
Qhov hnyav% |
Lub luag haujlwm hauv Alloy |
|
Chromium (Cr) |
18.0 – 20.0 |
Cov txheej txheem tiv thaiv oxide; resists dav corrosion thiab oxidation |
|
Nickel (Ni) |
11.0 – 15.0 |
Stabilizes austenitic qauv; txhim kho toughness thiab corrosion kuj |
|
Molybdenum (hli) |
3.0 – 4.0 |
Lub ntsiab tseem ceeb - blocks pitting thiab crevice nres los ntawm chlorides |
|
Cov pa roj carbon (C) |
Tsawg dua lossis sib npaug li 0.03 |
Tsawg carbon tiv thaiv carbide nag lossis daus thaum vuam |
|
Manganese (Mn) |
Tsawg dua lossis sib npaug li 2.00 |
Pab hauv deoxidation thiab kub ua haujlwm |
|
Silicon (Si) |
Tsawg dua lossis sib npaug li 0.75 |
Txhim kho oxidation tsis kam |
|
Phosphorus (P) |
Tsawg dua lossis sib npaug li 0.045 |
Impurity, khaws cia qis |
|
Sulfur (S) |
Tsawg dua lossis sib npaug li 0.030 |
Impurity, khaws cia qis |
|
Hlau (Fe) |
Tshuav |
Base hlau |
Tau qhov twg los: ASTM A240 / A240M
Kev kho cua sov ntawm 317L Steel Phaj
Cov txheej txheem kev kho cua sov ntawm 317L steel phaj yog tsim los ua kom zoo dua corrosion kuj thiab cov khoom siv kho tshuab thaum tswj cov austenitic microstructure.
Kev daws Annealing
Cov txheej txheem kev kho cua sov rau 317L stainless hlau phaj yog cov tshuaj annealing, feem ntau ua ntawm qhov kub thiab txias ntawm 1010℃thiab 1120 degree, ua raws li qhov txias txias.
Cov txheej txheem no pab:
Dissolve chromium carbides
Restore corrosion kuj
Txhim kho ductility
Txo kev ntxhov siab sab hauv
Kev ua kom txias sai sai tom qab annealing yog qhov tseem ceeb los tiv thaiv carbide nag lossis daus, uas tuaj yeem txo qhov kev tiv thaiv corrosion.
Kev ntxhov siab
Hauv qee cov txheej txheem fabrication, kev ntxhov siab yuav raug siv los txo cov kev ntxhov siab uas seem tom qab tsim lossis vuam. Txawm li cas los xij, overheating yuav tsum zam vim tias nws tuaj yeem cuam tshuam kev ua haujlwm corrosion.
Kev txiav txim siab vuam
Vim tias 317L steel phaj muaj cov ntsiab lus carbon tsawg, nws feem ntau tsis xav tau tom qab-weld kho cua sov. Qhov no ua rau fabrication yooj yim dua thiab txo cov nqi tsim khoom.
Nws zoo heev weldability tso cai rau kev siv cov txheej txheem vuam xws li:
TIG welding
MIG vuam
Shielded hlau arc vuam
Submerged arc vuam
Qhov no yog ib qho laj thawj 317L stainless hlau daim hlau nyiam rau cov khoom siv welded loj.
Mechanical thiab Physical Properties ntawm 317L Steel Phaj
Mechanical Properties ntawm 317L Steel Phaj
|
Khoom |
Tus nqi (Metric) |
Tus nqi (Imperial) |
|
Tensile zog (min) |
515 MPa ua |
75,000 psi |
|
Yield zog (0.2% offset, min) |
205 MPa |
30,000 psi |
|
Elongation (min, hauv 2 ") |
40% |
40% |
|
Hardness (max) |
217 HWB |
217 HWB |
|
Modulus ntawm Elasticity |
200 GPa |
29,000 ksg |
|
Impact Toughness (Charpy V-notch) |
>100 J ntawm chav tsev kub |
ductility zoo heev |
Tau qhov twg los: ASTM A240, ASME SA-240
Lub cev muaj zog ntawm 317L Steel Phaj
|
Khoom |
Tus nqi |
Sau ntawv |
|
Qhov ntom |
7.98 g / cm³ (0.288 lb / hauv³) |
Me ntsis siab dua 304/316 vim molybdenum ntau dua |
|
Melting Range |
1370 - 1400 ° (2500 - 2550 ° F) |
Hom rau austenitic stainless hlau |
|
Thermal conductivity |
15.0 W / m·K (ntawm 100 degree) |
qis dua carbon steel; nce nrog kub |
|
Tshwj xeeb kub muaj peev xwm |
500 J / kg · K (ntawm chav tsev kub) |
Hom rau cov qib austenitic |
|
Hluav taws xob Resistivity |
0.74 µΩ·m |
Tsis yog -magnetic nyob rau hauv annealed mob |
|
Thermal Expansion Coefficient |
16.0 × 10⁻⁶ /℃(20 ~ 1000 degree) |
Siab tshaj ferritic steels; tso cai rau kev nthuav dav hauv siab -kub tsim |
|
Magnetic Properties |
Tsis yog -magnetic (annealed) |
Tej zaum yuav ua me ntsis sib nqus tom qab ua haujlwm txias |
Tau qhov twg los: Ntau cov ntaub ntawv muab khoom siv
Daim ntawv thov ntawm 317L Steel Phaj
Vim nws txoj kev txhim kho corrosion thiab fabricability, 317L steel phaj tau ntseeg siab thoob plaws kev lag luam:
Tshuaj thiab Petrochemical uaSiv nyob rau hauv tso tsheb hlau luam, reactors, thiab cov kav dej uas tuav cov kua qaub, cov kuab tshuaj, thiab cov tshuaj chloride- uas muaj cov kwj deg. Cov ntsiab lus molybdenum siab dua tiv thaiv pitting uas yuav rhuav tshem 316L.
Pulp thiab Ntawv Kev Lag LuamCov cuab yeej siv tshuaj tua kab mob, cov tshuab digesters, thiab cov evaporators tau txais txiaj ntsig los ntawm 317L qhov kev tiv thaiv rau chlorine dioxide thiab alkaline cawv.
Pharmaceutical and Food ProcessingCov kav dej huv, cov kav dej, thiab cov khoom siv hluav taws xob hloov pauv yuav tsum tau huv, corrosion-dawb qhov chaw. 317L ua tau raws li cov qauv kev tu cev nruj thaum tiv thaiv cov tshuaj tua kab mob hnyav.
Fais fab Generation thiab Flue Gas DesulfurizationScrubber systems, chimneys, thiab cua sov-cov chav tsev rov qab ntsib acidic condensates; 317L muab kev ntseeg siab ntev - lub sijhawm ua haujlwm.
Marine thiab OffshoreOffshore platforms, desalination nroj tsuag, thiab seawater piping systems siv nws cov tshuaj tiv thaiv chloride.
Lwm yam kev sivsuav nrog textile dyeing khoom, chiv tsim, thiab architectural ntsiab nyob rau hauv ntug hiav txwv dej.
Engineers nquag qhia 317L thaum 316L tau pom qhov ua tsis tiav ntxov, txuag nqi qis thiab hloov pauv.
Xaus
317L stainless hlau phaj yog qis-carbon, siab-molybdenum austenitic alloy uas muaj kev tiv thaiv corrosion zoo dua li 316L, tshwj xeeb tshaj yog nyob rau hauv chloride- nplua nuj thiab acidic ib puag ncig. Nws cov chromium siab dua (18–20%), npib tsib xee (11–15%), thiab molybdenum (3–4%) cov ntsiab lus muab PREN tus nqi ntawm 30–34, ua rau nws tiv taus pitting, crevice corrosion, thiab tshuaj tua kab mob.
Cov ntsiab lus carbon tsawg (tsawg dua lossis sib npaug li 0.03%) tshem tawm qhov kev pheej hmoo ntawm kev hnov mob thaum vuam, yog li 317L tuaj yeem welded thiab muab tso ncaj qha rau hauv kev pabcuam yam tsis muaj nqi tshaj tawm -weld heat treatment. Nws kuj muaj cov cuab yeej zoo heev, nrog rau qhov tsawg kawg nkaus tawm lub zog ntawm 205 MPa thiab elongation ntawm 40%, nrog rau qhov tsis tshua muaj siab - qhov kub thiab txias toughness mus rau cryogenic kub.
Thaum xaiv 317L, ib txwm yuav los ntawm areputable tsumleej twg muab tag nrho cov ntawv pov thawj zeb (ASTM A240, ASME SA-240, EN 10204 3.1) thiab traceability.
