Tus Weldability ntawm 321 Cov Yeeb Nkab Stainless Hlau Li Cas?

Kev Ntsuas Weldability of 321 Stainless Hlau Hlab

321 Stainless hlau (06cr18ni10ti) yog ib qho kev siv roj tsis huv uas feem ntau yog weldability zoo. Nws ua ke cov kev siab tawv nrog qhov qis rau kev tawg txias. Txawm li cas los xij, vim qhov sib ntxiv ntawm titanium (ti) rau cov kev ntsuas carbide, thiab kev kho vaj tsev vuam kom tsis txhob muaj kev tswj hwm kev txhim kho kom tsis txhob sib tsoo thiab kub tawg.

Qhov Zoo Vuam Vuam 321 Stainless Hlau Leeg

Tsawg txias tawg pleb zoo li cas:
Lub Austenitic Micructure muaj kev ua siab loj (elongation ntau dua los yog sib npaug 40%), ua rau cov hlau nkag mus rau hydrogen-inducts cracking. Tsis muaj preheating yog yuav tsum tau vuam yuav tsum tau ua nyob rau hauv chav tsev kub, uas haum rau kev siv kub.

Zoo kub kub:
321 Stainless hlau khaws cov khoom siv zoo ntawm cov chaw kub thiab kub, txo qhov kev pheej hmoo ntawm weld tawg vim muaj kev ntxhov siab. Qhov no yog qhov tshwj xeeb tshaj yog thaum vuam nyias-walled kav dej lossis cov qauv nyuaj.

Carbide Ruaj Khetilization:
Titanium khi nrog cov pa roj carbon los tsim titanium carbide (TIC), ruaj khov cov pa roj carbon nyob hauv cov hlau. Qhov no txwv tsis pub cov pa roj carbon los ntawm qhov sib txawv rau cov ciaj ciam av thaum lub tshuab hluav taws cua sov thiab sib txuas nrog chromium los ua cov ntawv pob. Raws li qhov tshwm sim, thaj chaw kub-cuam tshuam rau thaj chaw (Haz) muaj kev txo qis rau kev sib txuam corrosion-tshwj xeeb tshaj yog thaum piv rau unstabilized 304 stainless hlau.

Muaj peev xwm teeb meem nyob rau hauv Vuam 321 Stainless Hlau Hlab

Kev pheej hmoo ntawm intergranular corrosion:
Hnyav Kub Ntau Yam:Yog hais tias lub taub hau nyob hauv qhov ntsuas kub thiab txias450-850 degreeRau lub sijhawm ncua ntev thaum lub sij hawm vuam, titanium carbide (TIC) nag lossis daus yuav tsis txaus. Residual carbon tsis khi los ntawm titanium kuj tseem ua ke nrog chromium cov ciaj ciam, ua rau chromium depetion.

Nyiam mus rau qhov kub tawg:
Thaum Austenitic stainless hlau feem ntau yog feem ntau tsis tshua muaj kev tawg pleb ntau dua li cov hlau ferritic, 321 stainless hlau tseem tuaj yeem tsim kev sib cav sib ceg. Qhov no tuaj yeem tshwm sim vim yog cov txiv leej faj thiab phosphorus impurities lossis tsis raug cov ntsiab lus ntawm cov pa roj carbon monoxide.

Corrosion tsis kam ntawm weld hlau:
Yog tias tsis tsim nyog muab tub lim hlau tsis tsim nyog siv (piv txwv li, tus qauv er308), Titanium cov ntsiab lus hauv Weld hlau yuav tsis txaus kom muaj cov roj carbon ntau. Qhov no tuaj yeem ua rau muaj kev cuam tshuam corrosion tsis kam ntawm weld hlau ua qis dua rau cov hauv paus hlau.

Cov Ntaub Ntawv Pom Zoo Cov Ntaub Ntawv rau Vuam 321 Stainless Hlau Leeg

Nyiam: cov chaw ua haujlwm ruaj khov
Siv ER347 (H08CR20NI10NB) lossis E347 (A132) Vuam Rods, uas muaj Niobium (NB)-ncu zoo ib yam li titanium. Nrog NB loj dua los yog sib npaug rau 10 × C%, Niobium zoo siv cov pa roj carbon hauv weld hlau, tiv thaiv kev tsim cov aav-depreted aones.

Lwm Txoj Kev Lag Luam: Titanium-Muaj Cov Khoom Siv Hluav Taws Xob
Yog tias lub hauv paus hlau muaj cov ntsiab lus titanium siab, ER321 (H08CR19NI10TI) tuaj yeem siv. Txawm li cas los xij, nco ntsoov tias titanium poob los ntawm oxidation ntawm siab vuam kub tuaj yeem txo nws cov hauj lwm ruaj khov hauv cov roj carbon.