Intergranular Corrosion Ntawm SS 316 Stainless Hlau: Ua, Kev Ntsuas, Thiab Kev Tiv Thaiv

Puas yog koj tab tom nrhiav cov ntaub ntawv hais txog qhov ua rau muaj kev cuam tshuam ntawm intergranular corrosion nyob rau hauv SS 316 stainless hlau los xyuas kom meej tias koj cov ntaub ntawv ua tau raws li corrosion kuj yuav tsum tau nyob rau hauv chemical, marine, los yog siab - daim ntawv thov kub? Ntau tus kws tshaj lij thiab cov kws tshaj lij kev muag khoom tab tom nrhiav txoj hauv kev los tiv thaiv kev sib tsoo ntawm 316 stainless hlau, tshwj xeeb tshaj yog nyob rau hauv welded Cheebtsam, kub exchangers, thiab piping systems. Kev nkag siab txog qhov ua rau corrosion, kev sim cov txheej txheem, thiab kev tiv thaiv kev tiv thaiv yog qhov tseem ceeb kom tsis txhob muaj cov khoom siv tsis ua haujlwm, kev tsim khoom poob qis, thiab kev hloov pauv nqi.

 

Dab tsi yog Intergranular Corrosion hauv SS 316 Stainless Hlau?

Intergranular corrosion (IGC) yog ib qho kev tawm tsam hauv cheeb tsam raws li thaj tsam lis ntawm austenitic stainless hlau zoo li SS 316. Nws feem ntau tshwm sim thaum chromium carbides precipitate thaum lub sij hawm siab - kub raug (450-850℃). Qhov no tuaj yeem txo qhov kev tiv thaiv corrosion raws cov ciam teb, txawm tias cov khoom siv ntau zoo li tsis cuam tshuam.

 

 

Ua rau SS316 Intergranular Corrosion

Qhov xwm txheej	Mechanism	Qhov cuam tshuam ntawm SS 316
Vuam	Thaum tshav kub kub- cov cheeb tsam cuam tshuam ua rau chromium carbide nag lossis daus	Weakens grain ciam teb corrosion kuj
Cov ntsiab lus carbon siab	C> 0.08% nce rhiab heev	Kev pheej hmoo siab ntawm intergranular corrosion
Thermal Exposure	450-850℃tsis muaj tshuaj annealing	Txhawb kev tsim carbide
Chloride Ib puag ncig	Aggressive ions tawm tsam grain ciam teb	Accelerates localized corrosion

Kev nkag siab zoo rau cov neeg yuav khoom:Txawm tias tus qauv SS 316 tuaj yeem raug kev txom nyem IGC yog tias vuam lossis kev kho cua sov tsis tswj tau zoo.

 

316 vs 316L: Resistance rau Intergranular Corrosion

Khoom	316 SIB	316L SS AW
Cov ntsiab lus carbon	Tsawg dua lossis sib npaug li 0.08%	Tsawg dua lossis sib npaug li 0.03%
IGC Kev puas tsuaj	Nruab nrab	Tsawg
Weldability	Zoo, tej zaum yuav xav tau tom qab -weld kho cua sov	Zoo heev, tsawg rhiab heev
Daim ntawv thov	General chemical & marine siv	Welded siab hlab ntsha, tshav kub exchangers

 

Yuav ua li cas txhawm rau txheeb xyuas qhov cuam tshuam ntawm intergranular hauv SS316?

1. ASTM A262 Test rau 316 Stainless Hlau

Xyaum E (Strauss Test) kuaj pom rhiab heev

Ntsuas susceptibility rau grain ciam teb nres

Tau txais dav los ntawm kev lag luam tshuaj, petrochemical, thiab zaub mov

2. Kev kuaj xyuas metallographic

Microscope soj ntsuam ntawm cov ciam teb

Qhia tawm chromium carbide nag lossis daus

3. Tshuaj ntsuam xyuas & PMI kuaj

316 PMI xeem (XRF / OES) pom zoo cov ntsiab lus molybdenum (2-3%)

Txheeb xyuas cov khoom sib xyaw-ups (316 vs 304 lossis 316L)

Ua raws li EN 1.4401 / ASTM A240 / UNS S31600

 

Nyem mus download tau ASTM A262 intergranular corrosion tests

Kev Tiv Thaiv Kev Ntsuas rau SS 316 Intergranular Corrosion

Txoj kev tiv thaiv	Kev piav qhia
Siv qis-Carbon 316L	Txo cov carbide tsim thaum vuam lossis siab - raug kub
Kev daws Annealing	Kev kho cua sov (1040-1120 degree) kom yaj carbides
Kev vuam zoo	Tswj cov khoom siv hluav taws xob, siv cov khoom siv hlau kom raug, txo lub sijhawm nyob
ASTM A262 Kev Xeem	Xyuas kom tseeb tias cov khoom tiv taus IGC
Kev kuaj PMI	Paub meej cov tshuaj muaj pes tsawg leeg ua ntej kev teeb tsa

 

Cov ntsiab lus tseem ceeb rau kev tsim khoom

SS 316 feem ntau yog corrosion-resistant, tab sis grain ciam nres tuaj yeem tshwm sim hauv welded lossis siab - daim ntawv thov kub.

316L stainless hlau raug pom zoo thaum IGC yuav tsum tau txo qis.

Kev ntsuam xyuas PMI thiab ASTM A262 yog qhov tseem ceeb los txheeb xyuas qib qhov tseeb thiab kev tiv thaiv corrosion.

Kev daws teeb meem annealing, kev siv vuam kom raug, thiab cov neeg muag khoom muaj ntawv pov thawj kom ntseeg tau ntev - ua haujlwm tau zoo.