Dab tsi yog qhov sib txawv ntawm cov stainless hom 304 316 thiab 409?
Tso lus
Kev sib piv ntawm 304, 316, thiab 409 stainless hlaus
Peb yam no yog rau sib txawv stainless hlau series, txawv feem ntau hauvTshuaj lom neeg muaj pes tsawg leeg, cov khoom siv mechanies, thiab cov ntawv sau npeCov. Hauv qab no yog cov ncauj lus kom ntxaws:
1. Tshuaj lom neeg sib xyaw
| Ntaus | Suav Qib Qib | Cov ntsiab lus tseem ceeb (%) | Cov Nta Tseem Ceeb |
|---|---|---|---|
| 304 | 0 6Cr19NI10 (Qub: 0cr18ni9) | Cru {{{{0}}}, ni}}, C Tsawg dua lossis sib npaug nrog 0.08 | Classic "{{18-8" ustenitic steel, molybdenum-dawb |
| 316 | 0 6Cr17NI12MO2ni2 (Laus: 0CR17NI2) | Cru {{{{{0}}} 10-14}, c Tsawg}, C sib luag lossis sib luag rau 0.08 | Austenitic Steel nrog Molybdenum, txhim kho corrosion tsis kam |
| 409 | {{0 {}} cr11ti (ASTM 409) | Crra1 0. {5-11. 75, Ti≈}. {}}. 6, C Ntau dua los yog sib npaug rau 0.08 | Tus Hlau Ferritic, Nickel-Dawb, Nrog Titanium Stretholization |
2. Cov cuab yeej cuab yeej cuab yeej sib txawv
Corrosion Kuj
🔹304 Stainless hlau corrosion tsis kam
Tiv taus atmospheric, dej tsis muaj dej ntshiab, thiab cov acid / alkali ib puag ncig (xws li, nitric acid). Muab cov kev txhim kho corrosion tsis kam (ntawm cov tshuaj tua carbon thiab daws kev kho mob).Raug rau pitting hauv chloride ib puag ncig(Seasater, ntsev cov kua, kua ntses).
Cov Kev Siv: Chav ua noj ua noj, ua zaub mov noj, kos duab kos duab zoo nkauj.
🔹316 stainless hlau corrosion tsis kam
Muaj {2-3% molybdenum,txhim kho kom txhim kho kom tsis kam mus rau chloride corrosion({2-3 x zoo dua 304). Kuj tiv taus cov sulfuric acid, phosphoric acid, cov organic acids, thiab cov oxidation kub (piv txwv li, cov chaw ua dej hiav txwv, chiv keeb).
Cov ntawv thov: Cov cuab yeej siv kho mob, cov khoom siv ua haujlwm, cov khoom siv dej hiav txwv dej hiav txwv dej nyab, tshuaj lom neeg tso tsheb hlau phom.
🔹409 stainless hlau corrosion tsis kam
Tsawg Chromium (≈11%),Tsis muaj zog tshaj plaws corrosion tsis kam, haum tsuas yog rau cov huab cua qhuav lossis tsis muaj kev tiv thaiv corrosive (piv txwv li cov pa hluav taws xob hauv cov tshuab tsheb). Titanium stabilization txo inngranular corrosion pheej hmoo.
Cov Kev Siv: Kev ntsuas kev ua lag luam, cov pa hluav taws xob, cov huab cua qis-tiv thaiv huab cua-tiv taus.
Cov Khoom Siv Neeg Kho Tshuab
🔹304 vs. 316 (Austenitic steels):
Ductility siab ntawm chav sov, tsis muaj hlau nplaum (tej zaum yuav muaj zog tsis muaj zog dua tom qab ua haujlwm txias). Muaj zog los ntawm kev ua haujlwm txias (khoov, ncab), tsis yog qhov nyuaj los ntawm kev kho cua sov.
316 muaj me ntsis zoo dua lub zog thiab oxidation tiv taus vim muaj cov ntsiab lus npib ntau dua (304 tsawg dua lossis sib npaug lossis sib npaug nrog 1200 degree).
🔹409 (Ferritic Hlau):
Tsawg dua nkig ntawm cov kub tsawg, sib nqus, weldable (yuav tsum tau kho tshav kub-weld-weld kev kho cua sov). Tsawg thermal nthuav tawm coefficient (haum rau sab ruaj khov nyob hauv ib puag ncig siab), zoo dua thermal conductivity tshaj li cov neeg siv tshuaj tiv thaiv Austenic.
Kev Kub Kub Kub Kub Kuj & Oxidation
🔹304: Tsim nyog rau kev siv ntev hauv qab 800 degree; Carbides yuav siv sijhawm tam sim no los saum toj no qhov kub thiab txias dua, ua rau muaj kev sib tshuam nrog kev txhim kho corrosion.
🔹316: Tsis kam mus rau ~ 1200 degree, nrog cov muaj zog sulfide corrosion tsis kam (piv txwv li, thee-fured flue roj).
🔹409: Tsis kam ua nruab nrab kub (tsawg dua lossis sib npaug nrog 600 degree), nrog titanium stabilizing tawm tsam cov oxidation kub.
Lub magnetism
🔹304/316: Tsis muaj hlau nplaum hauv annealed lub xeev; tej zaum yuav ua neeg sib nqus tsis muaj zog tom qab ua haujlwm txias (Martensitic Transformation).
🔹409: Ferritic qauv,ib txwm sib nqus, haum rau cov ntawv thov sib nqus (xws li cov hlau nplaum).
3. 304, 316, thiab 409 stainless hlau
🔹409: Tus nqi qis tshaj(Nickel-Dawb, Tsawg Chromium), zoo tagnrho rau cov ntawv thov nqi-rhiab nrog cov corrosion me ntsis (piv txwv li, automotive feem).
🔹304: Tus nqi siab tshaj plaws, feem ntau siv dav siv, ntsuas corrosion tsis kam, lub zog, thiab tus nqi.
🔹316: Tus nqi siab tshaj plaws(Molybdenum thiab Nickel siab), irreplaceable hauv kev xeb hnyav los yog kev kho mob kub, kev lag luam, tshuaj lom neeg siv tshuaj).
