316Ti vs 316L Stainless Hlau: Xaiv Ntawm Stabilization thiab Tsawg Carbon

 

Dab tsi yog cov tswv yim sib txawv ua haujlwm los ntawm 316L thiab 316Ti txhawm rau tiv thaiv kev sib tsoo?
Qib 316L (UNS S31603) siv txoj hauv kev "tsawg-carbon", txwv tsis pub cov pa roj carbon ntau tshaj 0.03%. Qhov no txo ​​qis cov pa roj carbon ntau los tsim chromium carbides thaum vuam. Qib 316Ti (UNS S31635) siv txoj hauv kev "stabilization". Nws tso cai rau cov ntsiab lus siab dua carbon zoo ib yam li tus qauv 316 tab sis ntxiv titanium (feem ntau ntau dua lossis sib npaug li 5 x C%). Lub titanium nyiam tsim cov titanium carbides ruaj khov, tiv thaiv chromium depletion. Ob lub tswv yim ua haujlwm tau zoo, tab sis lawv qhov kev ua tau zoo ntev - lub sijhawm sib txawv nyob rau hauv qhov kev kub ntxhov siab - raug kub.

Raws li cov kev pab cuam dab tsi 316Ti muab kev ua tau zoo dua 316L?
316Ti muaj qhov zoo dua rau cov khoom siv welded thiab yuav ua haujlwm tas li nyob rau hauv qhov kub thiab txias ntawm kwv yees li 400-900℃. Hauv qhov no, titanium carbides hauv 316Ti ruaj khov dua li qhov qis -carbon matrix ntawm 316L. Qhov no ua rau 316Ti tsis tshua muaj kev cuam tshuam rau kev nkag siab ntawm lub sijhawm. Yog li ntawd, nws yog feem ntau teev los ntawm high-temperature tsim codes (xws li ASME) rau siab hlab ntsha plhaub, tshav kub exchanger tubesheets, thiab lub cub tawg qhov chaw uas ua hauj lwm kub siab tom qab vuam.

Puas muaj qhov tsis zoo lossis kev ceev faj tshwj xeeb thaum tsim nrog 316Ti?
Qhov tseem ceeb fabrication ceev faj rau 316Ti kev txhawj xeeb vuam. Kev tiv thaiv roj zoo heev yog qhov tseem ceeb los tiv thaiv oxidation ntawm titanium hauv pas dej ua ke. Yog hais tias titanium oxidizes, nws poob nws cov nyhuv stabilizing, muaj peev xwm tawm hauv cov hlau weld raug rau rhiab heev. Kev siv cov hlau ua kom zoo thiab cov txheej txheem suab vuam yog qhov tseem ceeb. Tsis tas li ntawd, nws cov machining thiab tsim cov yam ntxwv zoo ib yam li cov qauv 316/316L.

Los ntawm kev yuav khoom thiab tus nqi muag, cov qhab nia sib piv li cas?
316L yog cov khoom siv dav tshaj plaws thiab feem ntau khaws cov qib ntawm ob, ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov fabricators feem ntau . 316Ti feem ntau nqa tus nqi me me vim qhov sib ntxiv ntawm titanium thiab yuav muaj sij hawm ntev dua rau qee yam khoom siv. Tus nqi sib txawv feem ntau yog marginal piv rau tag nrho cov nqi ntawm qhov project. Qhov kev txiav txim siab yuav tsum yog technically tsav los ntawm cov kev pab cuam thiab cov cai yuav tsum tau, tsis yog los ntawm cov khoom me me variations.

Cov lus qhia zaum kawg yuav tsum ua raws li cov khoom siv tshwj xeeb hauv pob tsim qauv?
Cov lus qhia tshwj xeeb yuav tsum tau tsav los ntawm kev tswj hwm tus qauv tsim thiab qhov ntsuas kub tsim. Rau kev xeb dav dav - tiv taus welded fabrications ua haujlwm nyob ze ntawm qhov kub thiab txias, qhia 316L. Yog tias tus qauv tsim tau tswj hwm los ntawm txoj cai ntawm lub nkoj siab thiab qhov ntsuas kub ntawm qhov tsim nyob rau hauv qhov ntau qhov kev pom zoo los yog xav tau (feem ntau saum toj no ~ 425 degree), qhia 316Ti. Ib txwm hais tag nrho UNS lub npe (S31603 lossis S31635) ntawm kev kos duab thiab xaj xaj kom tshem tawm qhov tsis meej pem.