Xaiv ntawm304 thiab 316stainless hlau tsis yog qhov kev txiav txim siab yooj yim tab sis tus nqi - kev tshuaj xyuas qhov txiaj ntsig. Cov lus nug tseem ceeb yog:Koj daim ntawv thov puas yuav tsum tau them tus nqi them rau kev txhim kho corrosion kuj muab los ntawm molybdenum?
Dab tsi yog qhov txawv ntawm 304 thiab 316 stainless hlau yeeb nkab?
Core Differences at a Glance: Comparative Data Table
| Yam ntxwv | 304 Stainless hlau (UNS S30400) | 316 Stainless hlau (UNS S31600) | Kws txawj pom kev |
|---|---|---|---|
| Lub ntsiab lus tseem ceeb | Cr: 18-20%, Ni: 8-10.5% | Cr: 16-18%, Ni: 10-14%,Mov: 2-3% | Molybdenum (Mo) yog qhov kev ua si - hloov pauv, dramatically txhim kho tsis kam mus rau chloride ions thiab organic acids. |
| Corrosion Resistance | Zoo. Resistant atmospheric corrosion, qaug zog acids, thiab alkalis. | Zoo heev.Superior tiv thaiv chlorides (xws li, brine) thiab acidic daws. | Hauv 3.5% NaCl ntsev tshuaj tsuag (ASTM B117), 316 feem ntau nthuav tawm3-5 npaug ntau duapitting tsis kam tshaj 304. Ib tug ntug dej hiav txwv fais fab nroj tsuag hloov cov kav dej txias nrog 304, uas raug kev txom nyem pitting thiab perforation nyob rau hauv 18 lub hlis; hloov mus rau 316 ncua kev pabcuam lub neej dhau 10 xyoo. |
| Tej kev siv | Kev tsim vaj tsev sab hauv tsev, khoom siv hauv tsev, tsis yog - khoom noj khoom haus corrosive, thiab khoom siv dav dav. | Cov khoom siv tshuaj thiab tshuaj, cov qauv ntawm ntug hiav txwv, cov nroj tsuag desalination, marine Cheebtsam, thiab cov khoom siv kho mob. | Peb muab cov kev daws teeb meem rau cov kua txiv hmab txiv ntoo: 304 rau cov kab dej huv, thaum 316 yog qhov tseem ceeb rau cov theem concentration uas muaj citric thiab malic acids los tiv thaiv kev ntxhov siab corrosion. |
| Mechanical & Machining | Tensile zog Ntau dua los yog sib npaug rau 515 MPa, Yield zog Ntau dua los yog sib npaug rau 205 MPa, zoo heev machinability. | Zoo siab -kub muaj zog; zoo sib xws tensile lub zog rau 304 tab sis ruaj khov dua ntawm qhov kub siab. | 316 ua akev ua haujlwm siab dua me ntsis- kev xav hardeningvim molybdenum, yuav tsum tau nruj dua txiav speeds thiab tooling, uas yuav marginally nce machining nqi. |
| Kev txiav txim siab nqi | Kev lag luam.Qhov kev xaiv tseem ceeb muaj nrog cov khoom siv qis dua. | Hwm.Feem ntau,20% -50% kim duantau 304. | Kev txiav txim formula:Tus Nqi Tag Nrho=Tus Nqi Khoom Siv + Tus Nqi Uas Tsis Txaus Siab.Rau ntev -lub sij hawm, kev teeb tsa tseem ceeb, tus nqi them rau 316 feem ntau raug them los ntawm nws cov kev saib xyuas txuas ntxiv - lub neej dawb. |
Qhov twg zoo dua, SS 304 lossis 316?
Tsis muaj "zoo dua," tsuas yog "zoo dua."
Xaiv 304rau ib puag ncig me me, kev siv nyiaj txiag rhiab heev, thiab qhov kev saib xyuas raws sij hawm tau txais. Piv txwv li, cov chaw tsim khoom lag luam loj HVAC siv 304 rau 90% ntawm nws cov kav dej hauv tsev, ua tiav kev tswj hwm tus nqi tag nrho.
Xaiv 316thaum ntsib ib puag ncig nrogchloride ions, acidic media, los yoghigh humidity. Rau ib txoj haujlwm South Asian Island resort, peb muab tag nrho cov khoom siv railing thiab piping. Thaum 304 tau siv rau hauv qhov chaw qhuav, 316 tau teev tseg rau thaj chaw ncaj qha rau cov tshuaj tsuag dej hiav txwv thiab pas dej ua ke, ua tiav qhov kev pom zoo ntawm kev ua haujlwm thiab tus nqi.
2. Dab tsi yog qhov tsis zoo ntawm 316 stainless hlau?
Qhov "qhov tsis zoo" ntawm 316 yog qhov kev lag luam muaj txiaj ntsig -tawm rau nws qhov kev ua tau zoo:
- Tus nqi siab dua:Lub ntsiab drawback. Molybdenum yog ib qho khoom siv hlau nrog cov nqi tsis hloov pauv, ncaj qha nce nqi.
- Ntau Complex Machining:Raws li tau sau tseg, nws xav tau ntau qhov tseeb machining tsis.
- Tsis yog Universal Solution:Nyob rau hauv ib puag ncig huab xws li txo cov acids muaj zog (xws li, kub concentrated sulfuric acid) los yog cov tshuaj chloride siab ua ke nrog kev kub siab, txawm tias siab dua - qib stainless hlau (xws li, 317L, super duplex) yuav tsum tau txiav txim siab.
- Risk ntawm Tshaj-Engineering:Siv 316 qhov twg 304 yog qhov tsim nyog tsim nyog rau kev siv nyiaj pov tseg.
3. Qhov txawv ntawm 316 thiab 316L yeeb nkab yog dab tsi?
Qhov sib txawv tseem ceeb nyob hauv cov ntsiab lus carbon, uas ncaj qha txiav txim siab tom qab -weld corrosion kuj.
- 316:Max carbon ntsiab lus Tsawg dua los yog sib npaug rau 0.08%. Thaum welding, nws raug rauchromium carbide nag lossis dausnyob rau hauv lub tshav kub- cuam tshuam cheeb tsam (HAZ), ua rau "sensitization" thiab txo tsis kam mus rau intergranular corrosion.
- 316L:Qhov "L" txhais tau tias Tsawg carbon, nrog cov ntsiab lus siab tshaj carbon tsawg dua los yog sib npaug0.03%. Qhov no txo qis qhov kev pheej hmoo ntawm rhiab heev tom qab vuam, ua nwsnyiam xaiv rau cov kav dej, flanges, thiab lwm yam fabrications xav tau vuam.
Cov lus qhia txog kev yuav khoom:Tshwj tsis yog rau tsis yog -welded bar Tshuag lossis forgings,ib txwm qhia 316L rau welded engineering tej yaam numlos xyuas kom meej lub sij hawm ntev - kev ncaj ncees ntawm weld aav. Peb ua raws li kev pom zoo316l cevrau txhua tus neeg siv khoom hauv kev lag luam tshuaj thiab zaub mov & dej haus kom ua tau raws li lawv cov qauv kev nyiam huv thiab kev nyab xeeb.
Xaus: Daim Ntawv Teev Npe rau Kev Txiav Txim Siab Tshaj Tawm - Ua
1. Txhais ib puag ncig:Qhov nruab nrab puas muajchlorides(xws li ntsev, bleach),kua qaub, los yogsulfides?
2. Ntsuas qhov Risk:Yuav ua li cas yog tus nqi ntawm corrosion tsis ua hauj lwm nyob rau hauv cov nqe lus ntawmdowntime, kho, kev nyab xeeb, los yog lub npe nrov npe poob?
3. Xam nqi Lifecycle:Tau 316 qhov kev nqis peev ntau dua thawj zaug tau raug lees paub los ntawm nwskev pab lub neej ntev dua thiab cov nqi kho mob qis dua?
4. Paub meej txoj kev Fabrication:Yog hais tias welding muaj feem xyuam,koj yuav tsum xaiv 316L.
Los ntawm teb cov no304 thiab 316stainless hlau cov lus nug, koj txav mus dhau qhov simplistic query ntawm "qhov twg hlau yog zoo dua" los ua cov kev tshaj lij thiab kev xaiv cov khoom siv nyiaj txiag.
Email:baohui@bhsteelpipe.com
