Dab tsi yog qhov txawv ntawm 304 thiab 316 stainless hlau? Koj yuav tsum xaiv qhov twg?
Qhov sib txawv tseem ceeb nyob rau hauv lub xub ntiag ntawm molybdenum nyob rau hauv 316 stainless hlau, uas muab nws superior corrosion kuj, tshwj xeeb tshaj yog tiv thaiv chlorides thiab acids, ua rau nws zoo tagnrho rau marine thiab hnyav chemical ib puag ncig . 304 stainless hlau yog txaus rau feem ntau nyob rau hauv tsev thiab sab nraum zoov daim ntaub ntawv thiab yog tus nqi ntau dua - zoo. Yog tias koj qhov project yuav raug dej ntsev, tshuaj lom neeg, lossis lwm yam xov xwm corrosive heev, ces 316 yuav tsum xaiv; txwv tsis pub, 304 yog qhov kev xaiv tsim nyog thiab pheej yig dua.
Kuv puas yuav tsum siv 304 lossis 316 stainless hlau?
Qhov sib txawv tseem ceeb yog tias 316 stainless hlau muaj molybdenum, uas ua rau nws corrosion ntau dua - tiv taus ntau dua thiab pheej yig dua 304 stainless hlau, tshwj xeeb tshaj yog nyob rau hauv chloride (xws li ntsev) corrosion. Yog li ntawd, 304 yog qhov tsim nyog rau ib puag ncig me me, thaum 316 yog qhov tsim nyog rau qhov hnyav corrosive ib puag ncig xws li marine ib puag ncig lossis kev ua tshuaj lom neeg.
Stainless hlau yog ib qho ntawm cov khoom siv dav siv hauv kev lag luam niaj hnub no, sib txuas lub zog, ruaj khov, thiab corrosion kuj. Ntawm ntau qib ntawm stainless hlau, 304 thiab 316 yog cov feem ntau siv. Txawm hais tias lawv saib thiab muaj cov khoom zoo sib xws, qhov sib txawv me me tuaj yeem muaj kev cuam tshuam loj rau kev ua haujlwm, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav.
Chemical Composition thiab Alloying Elements
Qhov sib txawv tseem ceeb ntawm 304 thiab 316 stainless hlau nyob hauv lawv cov tshuaj muaj pes tsawg leeg. Ob leeg yog austenitic stainless hlau, nrog chromium thiab npib tsib xee ua lub ntsiab alloying ntsiab, tab sis 316 stainless hlau kuj muaj molybdenum ntxiv, uas txhim kho nws corrosion kuj.
| Element | 304 Stainless hlau | 316 Stainless hlau |
|---|---|---|
| Chromium (Cr) | 18–20% | 16–18% |
| Nickel (Ni) | 8–10.5% | 10–14% |
| Molybdenum (hli) | - | 2–3% |
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.08% | Tsawg dua lossis sib npaug li 0.08% |
| Manganese (Mn), Silicon (Si), Phosphorus (P), Sulfur (S) | Cov lej | Cov lej |
Ntxiv molybdenum rau 316 stainless hlau txhim kho nws cov kev tiv thaiv rau chlorides thiab acids, ua rau nws tsim nyog rau marine thiab tshuaj siv. Hauv qhov sib piv, 304 stainless hlau yog txaus rau feem ntau siv sab hauv tsev thiab dav siv.
Mechanical thiab Physical Properties
Los ntawm kev xav txog cov khoom siv kho tshuab, 304 thiab 316 stainless hlau muaj ntau qhov sib xws. Ob leeg tsis yog -magnetic nyob rau hauv lub xeev annealed thiab muaj zoo formability thiab weldability. Txawm li cas los xij, lawv lub zog thiab kub tsis kam sib txawv me ntsis.
| Khoom | 304 Stainless hlau | 316 Stainless hlau |
|---|---|---|
| Tensile zog (MPa) | ~520 | ~515 |
| Yield zog (MPa) | ~215 | ~205 |
| Elongation (%) | ~45 | ~40 |
| Qhov ceev (g / cm³) | 8.00 | 8.03 |
| Melting Point (zeeg) | 1400–1450 | 1375–1400 |
Ob qib ntawm stainless hlau muaj kev ua tau zoo tshaj qhov kub thiab txias. Txawm li cas los xij, 316 stainless hlau nthuav qhia me ntsis kev ruaj ntseg zoo dua nyob rau hauv siab - qhov kub thiab siab - cov av noo ib puag ncig, uas piav qhia nws cov kev siv zoo tshaj hauv cov tshuaj lom neeg thiab dej hiav txwv.
Corrosion Resistance thiab Environmental Performance
Qhov tseem ceeb tshaj qhov sib txawv ntawm ob qib no yog nyob rau hauv lawv cov corrosion kuj.
304 Stainless hlau
Nws pom zoo heev corrosion kuj nyob rau hauv ib txwm atmospheric thiab dej tshiab ib puag ncig.
Nws muaj kev tiv thaiv zoo rau oxidation thiab tsis muaj zog tshuaj corrosion.
Kev siv tsis pom zoo nyob rau hauv ib puag ncig uas muaj cov tshuaj chloride siab (xws li dej hiav txwv los yog ntug hiav txwv), vim pitting corrosion yuav tshwm sim nrog kev siv ntev.
316 Stainless hlau
Muaj molybdenum, nws pom zoo tiv thaiv chlorides thiab saline ib puag ncig.
Nws kuj tseem tiv taus cov kua qaub, alkalis, thiab cov kuab tshuaj muaj zog.
Nws yog qhov zoo tagnrho rau kev tsim khoom nkoj, tshuaj lom neeg, thiab zaub mov ua lag luam.
Nyob rau hauv luv luv, 316 stainless hlau outperforms 304 stainless hlau nyob rau hauv hnyav los yog corrosive ib puag ncig, thaum 304 stainless hlau tseem yog ib qho kev xaiv pheej yig dua rau cov qauv siv.
| Feature | 304 Stainless hlau | 316 Stainless hlau |
|---|---|---|
| Corrosion Resistance | Zoo tsis kam mus rau ntau yam tshuaj thiab tshuaj | Zoo heev tiv thaiv corrosion, tshwj xeeb tshaj yog los ntawm chlorides thiab acids |
| Ntsiab Alloying Element | Chromium thiab npib tsib xee yog thawj alloying ntsiab | Chromium, nickel, thiab molybdenum |
| Nqi | Kev lag luam ntau dua | kim dua vim qhov ntxiv molybdenum |
| Cov Khoom Siv Zoo Tshaj Plaws | Kev siv sab hauv tsev, khoom siv hauv chav ua noj, thiab kev ua zaub mov | Marine ib puag ncig, tshuaj ua haujlwm, khoom siv kho mob, thiab thaj chaw uas muaj ntsev ntau |
| Mechanical Properties | Zoo mechanical zog | Feem ntau me ntsis muaj zog thiab nyuaj dua 304 |
Koj yuav tsum xaiv qhov twg?
Yog tias koj daim ntawv thov tsis suav nrog ntsev, tshuaj corrosive heev, lossis lwm yam khoom muaj corrosive heev, xaiv 304. Rau kev siv txhua hnub, xws li cov khoom siv hauv tsev hauv tsev lossis rooj tog zaum, 304 yog qhov kev xaiv pheej yig.
Yog tias koj qhov project yuav raug siv nyob rau hauv marine ib puag ncig, nyob ze ntug dej hiav txwv, nyob rau hauv txoj kev salting cheeb tsam, los yog nyob rau hauv cov tshuaj nroj tsuag, xaiv 316. Tus nqi siab dua yog ib qho kev nqis peev nyob rau hauv lub neej nyob rau hauv cov cheeb tsam hnyav, tiv thaiv corrosion ntxov ntxov thiab tsis txhob mus ntev - lub sij hawm, nqi hloov.
