Nyob rau hauv lub realm ntawm corrosion {{}}}}} resist edolled Austenitic exchors thiab intergranular corrosity, "l" - kub nthuav tawm.
316L yog lub hauv paus qis qis - Cov pa roj cariabt ntawm cov workforts 316 alloy, tshwj xeeb tawm tsam chlorides, thiab zoo teeb meem.
316LN tsim ncaj qha rau lub hauv paus no, ntxiv cov tswj nitrogen (n) rau 316L muaj pes tsawg leeg. Qhov kev txhob txwm pom zoo nitrogen ntxiv cov khoom siv tseem ceeb hauv cov khoom tseem ceeb yam tsis muaj kev fij tus tub ntxhais lub cev uas tau txhais lub 316 tsev neeg.
Tsab ntawv sau no rho tawm cov lus txhais, kev sib xyaw, cov kev coj ua kom sov, thiab cov tswv yim sib txawv ntawm 316L los coj koj cov khoom xaiv cov txheej txheem.
316LN yog dab tsi?
316LN yog nitrogen - kev txhim kho, qis-} cov roj carbon monustenitic stainless hlau. Nws yog lub tswv yim hloov kho ntawm hom 316L, uas tswj cov nitrogen ntxiv. Tus "N" nyob rau hauv nws cov txheej txheem qhia meej meej meej meej txog cov ntsiab lus nitrogen no.
Lub hom phiaj tseem ceeb ntawm kev ntxiv cov nitrogen yog kom nce alloy lub zog, tshwj xeeb nws tau cog tseg lub zog, corrosion tsis kam, lossis weldability. Nitrogen yog lub zog muaj zog -} kev daws teeb meem hauv cov hlau hauv lub cev tsis huv. Nws dissolves interstentitially nyob rau hauv cov hlau {}} chromium {}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} pamas thiab hardness.
Kev ua kom muaj zog, cov dag zog no tshwm sim yam tsis muaj kev kho cua sov thiab ua kom muaj kev sib zog ua kom zoo nkauj xws li} A279, AVEX A312 / A358, thiab ENT358, thiab ENT358.
Nws pom cov ntawv tseem ceeb hauv cov nkoj siab, cov cuab yeej ua kom muaj zog, thiab cov khoom siv cua sov kom muaj zog dua li cov qauv 316L tuaj yeem muab, tshwj xeeb tshaj yog thaum huab cua thiab muaj kev kub ntxhov.
316l yog dab tsi?
316l yog qhov qis -} carbon version ntawm cov hom siv dav 316 Ausenitic Stainless hlau. Tus "l" sawv rau "cov pa roj carbon tsawg," nrog nws cov pa roj carbon cov ntsiab lus ib txwm capped ntawm ntau tshaj ntawm 0.030%. Qhov kev txiav txim siab no txo nyob rau hauv cov ntsiab lus carbon yog nws lub ntsiab lus pom zoo piv rau cov qauv 316.
Cov txiaj ntsig tseem ceeb ntawm cov roj carbon tsawg yog ntau dua zoo ntxiv rau qhov tsis txaus ntseeg. Cov kev paub txog cov chromium carbides nag los nag ntawm kwv yees li ntawm 425 Qib rau 850 degree, xws li thaum siab {}} kub kev pab. Qhov dej nag no depletes cov chromium uas nyob ib puag ncig cov ciaj ciam av, ua rau cov dej sib luag (IGC) lossis kev sib tshuam) hauv qee qhov chaw muaj kev sib cav.
Los ntawm kev txo cov pa roj carbon, 316L tseem ceeb txo qhov kev tsim ntawm cov carbides ua rau muaj kev puas tsuaj, khaws cia cov cua sov (tob) ntawm Welds- kub nthuav tawm. Nws khaws tau qhov dav dav dav dav corrosion tsis kam ntawm hom 316, tshwj xeeb tiv thaiv pitting thiab crevice corrosion hauv chloride hauv chloride nyob rau hauv chloride nyob rau hauv chloride nyob rau hauv chloride nyob rau hauv chloride nyob rau hauv chloride nyob rau ib puag ncig vim nws molybdenum cov ntsiab lus (2-3%).
316L tau teev tseg hauv cov qauv zoo li ASTM A240, A276 / A479, A312 / A358, thiab ENTILY 1.4435). Nws yog qhov mus -}} kev xaiv rau welded fabriccents, cov khoom siv tshuaj lom neeg, thiab cov khoom lag luam ua khoom noj uas yog vuam ua haujlwm thiab corrosion tsis kam yog qhov tseem ceeb.
316LN vs . 316 l: kev sib piv sib piv
Cov tseem ceeb ntawm 316LN thiab 316L cov lus dag hauv lawv cov qauv roj ntsha (FE) rau kev ua yeeb yaj kiab tseem ceeb) tshwj xeeb hauv chlorides.
Qhov tseem ceeb, ob qho tib si tshwj xeeb cov ntsiab lus muaj roj carbon tsawg (C: Tsawg dua lossis sib npaug ntawm 0.030% Max) los tawm tsam cov kev xav. Qhov kev txhais tau sib txawv sib txawv yog qhov kev txhob txwm nitrogen (n) ntxiv rau 316LN:
Nitrogen (n): Nov yog tus yuam sij sib cais {{latically} l feem ntau muaj cov ntsiab lus nitrogen nyob rau hauv cov khoom ntawm 0..10%, feem ntau suav hais tias yog cov khoom seem. Hauv kev sib piv, 316LN yog teev nrog kev txhob txwm nitrogen ntxiv, feem ntau yog xws li 0.16% rau 0.16% tsawg kawg nkaus, feem ntau yog nyob ntawm tus qauv tshwj xeeb. Qhov no tswj hwm cov theem nitrogen yog qhov tseem ceeb rau kev ua tiav cov khoom siv neeg kho tshuab txhim kho.
Manganese (MN): Cov qauv rau 316LN feem ntau tso cai me ntsis siab tshaj mananese cov ntsiab lus piv rau cov qauv 316L specs. Manganese pab khaws cov nitrogen hauv kev daws teeb meem thaum lub sijhawm melting thiab kev ua.
Lwm cov ntsiab lus: Qib ntawm silicon (si), phosphorus (p), thiab lwm yam seem uas zoo sib xws thiab nruj me ntsis hauv ob qho kev cai. Chromium thiab npib tsib xee yog feem ntau zoo tib yam. Molybdenum ranges kuj zoo ib yam.
316Ln vs . 316 l: cov khoom siv mechanical
Qhov tseem ceeb tshaj plaws kev sib txawv ntawm 316L thiab 316l lus dag nyob rau hauv lawv chav sov thiab nce qhov kub siv zog lub zog, ncaj qha rau cov ntsiab lus nitrogenable:
Tos lub zog: Qhov no yog 316LN ci. Cov khoom {- Kev daws teeb meem zoo rau cov nitrogen tseem ceeb ntawm 0.2% offset paib lub zog. Tus yam tsawg kawg tau lees lub zog zog rau annealed 316L yog ib ncig 170 MPa (25 Ksi). Rau annealed 316LN, no jumps mus li ntawm 240 mpa (35 ksi) lossis siab dua, sawv cev rau 40-50% nce ntxiv.
Lub zog tensile: Nitrogen tseem muaj lub zog kawg tensile muaj zog, txawm hais tias qhov kev sib npaug yog tsawg dua li muaj zog. Cov yam yam zoo li UTS rau 3185 MPa (70 ksi), thaum 316LN ua tiav kwv yees li 550 MPA (80 KSI) tsawg kawg nkaus - nce ib puag ncig 13-15%.
Ductility thiab kev nruj: zoo kawg li, qhov nce loj ua kom muaj zog los ntawm nitrogen ntxiv los ntawm qhov kev mob me me hauv kev ua haujlwm lossis tawv. Ob qho tib si alloys ua pov thawj zoo tshaj plaws elongation thiab tej yam kev cuam tshuam nyuaj ntawm chav tsev kub. Cov qauv Austenitic kom ua tau zoo ductility nqes rau cryogenic kub, nrog 316LN tswj cov xeeb ceem no.
Hardness: Nitrogen nce lub hardness ntawm 316LN piv rau 316L nyob rau hauv anealed mob. Raug brinell hardness (HBW) rau 310 max, thaum 316LN tej zaum yuav ze rau xyoo 190 HBW.
Qoob looxno muaj zog: cov txiaj ntsig ntau zog zog ntawm 316Ln feem ntau txhais tau los txhim kho lub zog nkees piv rau 316L, tshwj xeeb {2} kev voj voog kom qaug zog.
Ua haujlwm hnyav: cov alloys ua haujlwm hnyav thaum muaj kev tsim txias thaum lub sijhawm txias. Qhov siab dua thawj lub zog ntawm 316Ln txhais tau tias nws ncav cuag cov zog siab dua nrawm dua thaum ua haujlwm txias.
316LN vs . 316 l: thermal khoom
Thaum nitrogen qhov kev cuam tshuam thawj yog nyob rau ntawm cov tshuab muaj zog, nws kuj tsis cuam tshuam qee qhov kev coj ua hluav taws xob:
Cov ntsiab lus tseem ceeb: Cov ntsiab lus muaj sib luag ntawm cov ntsiab lus carbon qis, muab cov txiaj ntsig zoo tshaj plaws rau kev ua kom zoo thiab raug rau cov neeg mob carbide kub. Nitrogen nws tus kheej tsis tsim cov carbides thiab tsis cuam tshuam dab tsi uas muaj cov cuab yeej tseem ceeb no.
High - kub lub zog: 316LN tswj nws lub zog tseem ceeb tau kom zoo dua 316L ntawm kev kub siab ntau. Nws lub zog ntau dua zog txhais lus ncaj qha rau kev sib txawv zoo dua thiab kev ntxhov siab tsis txaus siab hauv cov ntau no piv rau 316L. Tshaj li no, qhov zoo dua li cas raws li qhov cuam tshuam thermal dominate.
Thermal nthuav dav: Cov coefficient ntawm thermal expansion (CTE) rau ob qho alloys yog zoo tib yam thiab raug rau cov hlau tsis huv.
Thermal conductivity: thermal conductivity tseem ceeb rau ob alloys zoo heev thiab tsis tshua muaj piv rau cov roj carbon.
Cov kab tsuag melting: kev sib tw melting ntawm ob qho alloys yog qhov tseem ceeb zoo ib yam, feem ntau nyob ib ncig ntawm 1370-1400 degree.
Lub ntsiab
Xaiv nruab nrab ntawm 316LN thiab 316L hinges rau kev nkag siab txog lawv cov tseem ceeb sib xws thiab qhov tseem ceeb sib txawv. Ob alloys muab cov feem ntau corrosion tsis kam, tshwj xeeb tshaj tawm tsam chlorides vim yog qhov kev txiav txim siab thiab kev cuam tshuam zoo vim lawv cov ntsiab lus muaj roj carbon. Lawv qhia zoo shoitability, weldability, thiab cryogenic nyuaj.
Qhov txiaj ntsig txiav txim siab ntawm 316Ln yog nws qhov ntau dua cov tshuab muaj zog, tshwj xeeb tshaj yog cov zog hluav taws xob, muab los ntawm nws cov tswj cov nitrogen ntxiv. Lub zog no zoo dua ntawm kev kub siab ntau, muab zoo dua rau kev nkag mus thiab kev ntxhov siab tsis sib haum.
