Stainless hlau 316L yog hlau uas txuas ntxiv txo cov ntsiab lus carbon ntawm lub hauv paus ntawm 316. 316L muaj cov ntsiab lus carbon qis dua, yog li nws muaj zog tiv thaiv corrosion. Lub zog ntawm ob qho tib si
Qhov sib txawv tseem ceeb ntawm 316 thiab 316L yog cov ntsiab lus carbon, 316L tsawg dua 0.03%, thiab 316 tsawg dua 0.08%. Hauv austenitic stainless hlau series, carbon yog lub hauv paus uas yooj yim ua rau cuam tshuam intergranular. Qhov qis dua cov ntsiab lus carbon, qis dua qhov kev xav rau kev xeb intergranular. Yog li ntawd, kev tiv thaiv xeb ntawm 316L muaj zog dua li ntawm 316, thiab tus nqi kuj tseem kim dua li 316.
Cov txheej txheem ntawm cov pa roj carbon intergranular corrosion yog raws li hauv qab no:
Qhov xwm txheej tsim nyog rau cov hlau tsis xeb kom tiv taus xeb yog qhov feem ntau ntawm chromium yuav tsum ntau dua 10-12%. Thaum qhov kub nce, qhov sib kis ntawm cov pa roj carbon hauv cov hlau tsis muaj hlau ntau dua li ntawm chromium. Vim tias cov pa roj carbon solubility hauv austenite ntawm chav sov me me, li 0.02% mus rau 0.03%, thiab cov ntsiab lus carbon feem ntau austenitic stainless hlau ntau dua li tus nqi no, cov pa roj carbon ntau yuav txuas ntxiv mus rau hauv austenite. Cov kab lis kev cai nthuav dav thiab sib xyaw ua ke nrog chromium los tsim cov tshuaj sib xyaw chromium carbide, xws li (CrFe) 23C6, ntawm cov muaju. Cov ntaub ntawv qhia pom tias lub zog ua kom muaj zog ntawm chromium diffusion raws cov ciam teb yog 162 ～ 252KJ/mol, thiab lub zog ua kom muaj zog ntawm chromium diffusion los ntawm cov nplej yog kwv yees li 540KJ/mol, uas yog, kev nthuav tawm nrawm ntawm chromium los ntawm cov qoob loo yog qeeb dua tshaj qhov nthuav tawm nrawm ntawm chromium raws cov ciam teb. Cov chromium lig dhau los nthuav mus rau thaj tsam ntawm cov noob, yog li cov chromium xav tau rau chromium carbide tsim nruab nrab ntawm cov muaju tsis yog los ntawm sab hauv ntawm austenite nplej, tab sis los ntawm ib puag ncig ntawm cov ciam teb ciam. Raws li qhov tshwm sim, cov ntsiab lus chromium nyob ze cov ciam teb tau nce ntau heev. Kev txo qis, thaum qhov sib faib loj ntawm chromium ntawm thaj tsam ntawm cov qoob loo qis qis dua 12%, qhov hu ua&"; cheeb tsam chromium-depleted &"; yog tsim. Nyob rau hauv qhov kev txiav txim ntawm cov xov xwm corrosive, cheeb tsam chromium-depleted yuav plam nws qhov kev txhim kho corrosion thiab ua rau intergranular corrosion.
Tsis ruaj tsis khov austenitic stainless hlau nrog cov ntsiab lus carbon ntau dua 0.03% (uas yog, 0Cr18Ni9 stainless hlau tsis muaj titanium lossis niobium), yog tias kev kho cua sov tsis raug, nws muaj feem cuam tshuam rau kev cuam tshuam ib puag ncig. Thaum cov hlau no tau ua kom sov nruab nrab ntawm 425-815 ° C lossis maj mam txias los ntawm qhov ntsuas kub no, kev xeb xeb yuav tshwm sim. Kev kho cua sov zoo li no ua rau nag lossis daus ntawm carbides nyob ib puag ncig cov lis dej num (ua kom pom tseeb) thiab ua rau cov tshuaj chromium ploj mus nyob rau thaj tsam ze tshaj plaws, ua rau cov cheeb tsam no raug rau xeb.
316 muaj C≤0.08 muaj Ni10 ~ 14
316L muaj C≤0.03 muaj Ni12 ~ 15
Los ntawm kev xav ntawm cov tshuaj lom neeg muaj pes tsawg leeg, 316L muaj cov cuab yeej zoo dua qub thiab muaj kev tiv thaiv zoo nyob hauv tib qhov xwm txheej. Tau kawg tus nqi yuav siab dua.
https://www.cunruisteel.com/