Vuam Ntawm SA387 Gr12 Heat Resistant Steel Phaj

Cov cua kub-resistant steel (HRS) hais txog hlau uas muaj thermal stability thiab thermal lub zog txawm nyob rau hauv cov neeg muaj kev kub siab. Thermal stability yog qhov kev ua tau los ntawm cov hlau uas ua kom cov tshuaj muaj zog (kev xeb tuaj yeem, tsis muaj oxidation) raws li qhov kub siab; thermal lub zog hais txog hlau thaum muaj kev sov siab muaj peev xwm txaus, uas tsuas yog los ntawm cov khoom siv choj xws li chromium, molybdenum thiab vanadium, titanium, niobium thiab li ntawm kev xaiv ntawm cov khoom siv vuam yuav tsum txiav txim siab raws li cov hlau alloy contentof base khoom. Pearlitic Heat resistant steel nrog ib tug qes alloy xws li a335-p12 , SA387 Gr12 tau dav siv nyob rau hauv kev tsim kho ntawm roj av thiab petrochemical kev lag luam sib.


Weldability ntsuam ntawm heat tshav hlau phaj

Cov phom tag nrho xws li Chromium thiab molybdenum yog qhov tseem ceeb ntawm Pearlite cov cua kub-resistant hlau tuaj yeem ua rau lub siab kub thiab qhov kub siab oxidation kuj muaj hlau, tab sis thaum lub sij hawm lawv lub sij hawm lawv muaj cov pluag hlau weldability, ua tus weld thiab tshav kub nyhav rau thaj tsam siab tshaj plaws, quenching yooj yim tsim nyuaj thiab brittle Martensite qauv hauv huab cua txias tom qab welding, uas tsis tsuas cuam tshuam rau cov khoom sib txuas ntawm cov pob qij txha caj npab, kuj muaj lub siab zoo ntawm sab hauv kev nyuab siab thiab qaug txias. Yog li, qhov teeb meem tseem ceeb ntawm cov cua kub uas tiv thaiv hlau welding yog cov keej uas cuam tshuam los ntawm: qauv, kev nyuab siab thiab nyiaj hydrogen hauv vuam, yog li nws yog qhov tseem ceeb tshwj xeeb los tsim cov txheej txheem tsim nyog.

 

Vuam txheej txheem ntawm perlite kub resistant hlau

1 Groove

Cov zawj feem ntau yog ua los ntawm cov nplaim taws lossis cov ntshav kom txiav. Yog hais tias tsim nyog, lub txiav yuav tsum tseem yuav preheated. Tom qab txhuam hniav, PT kuaj yuav tsum tau ua kom tshem cov kab nrib pleb ntawm daim nplaub tshev.V-zoo li tus nplaum nrog lub Angle ntawm 60 ° feem ntau raug xaiv. Ib qho loj xauv nrob qaum yog ntau txoj hau kev tiv thaiv kab nrib pleb, tab sis tib lub sij hawm ua kom nws cov vuam voog peev. Qhov zawj thiab sab hauv sab yuav tsum tau ci kom tshem cov av xws li roj, xeb thiab dej (dehydrogenation thiab tiv thaiv lub tshuab qej).

2 Weld tightness

Nws tsis tuaj yeem yuam kom weld ua ke kom tsis txhob muaj kev nyuab siab vim yog tawg loj ntawm crmo heat resistant steel. Yog li, txoj hlua ntawm vuam seam yuav tsum tsis txhob siab dhau thaum lub vuam kom tsis txhob muaj kev txhav ntau, tshwj xeeb tshaj yog rau cov phaj plawg vuam. Cov tensile tuav, fixtures thiab fixtures uas tiv thaiv kom txhob muaj qhov contraction dawb ntawm vuam seam yuav tsum tau zam kom deb li deb tau.

3 Welding txujci

Tamsim no, siv cov cuab yeej siv HRS feem ntau yog tungsten electrode argon arc vuam rov qab, electrode arc vuam filling npog, thiab lwm txoj hau kev nrog rau hauv cov nkev hauv cov nkev roj thaiv (MIG) vuam, CO2 roj shielded arc welding, electroslag welding thiab submerged automatic vuam thiab thiaj li.

4 Welding khoom

Thaum xaiv cov khoom siv vuam, qhov sib txoos ntawm cov hlau thiab cov zog ntawm cov hlau txuas yuav tsum ua raws nraim nrog cov qauv siv los ntawm cov khoom siv los yog ua tau raws li cov kev qhia yam tsawg kawg nkaus tau npaj tseg los ntawm cov khoom tsim ntawm cov khoom ua lag luam.Thiab kom txo cov ntsiab lus ntawm hydrogen yuav tsum tau qhuav raws li cov txheej txheem qhia ntawv (qhuav yuav tsum tsis pub ntev tshaj peb zaug), txhuam hauv qhov txig rhuav tshem txu hluav taws xob (tsis pub tshaj 4 teev) raws li qhov xav tau, uas muaj cov ncauj lus kom ntxaws hauv qhov kev tsim kho txheej txheem. Austenitic stainless hlau electrode xws li A307 tuaj yeem siv tau rau kev siv tes rau ntawm chromium-molybdenum cov hlau uas muaj cua sov, tab sis preheat yog tseem xav tau ua ntej welding. Qhov no yog siv rau qhov mob uas qhov vuam siv tsis ua kom sov tom qab welding.

5 Ua Ntej

Kev Preheating yog ib qho tseem ceeb ntawm txoj kev ntsuas kom tshem tawm cov kab ntub txias thiab kev nyuab siab nyob rau hauv cov hlau pearlitic cov cua sov uas tiv taus. Yuav kom ntseeg tau tias qhov zoo ntawm qhov vuam, ob qho chaw welding thiab welding txheej txheem yuav tsum tau preheated thiab tswj tau ib qhov kub thiab txias.

6 Cua txias tom qab welding

Kev qeeb cua txias tom qab qhov vuam yog qhov tseem ceeb uas cov hlau txuas tiv tshav kub kub yuav tsum nruj ua raws li hauv lub caij ntuj sov sov tas. Thaum lub hnab ntim ntawm daim npog asbestos weld thiab ze ntawm thaj chaw seam, cov voj voog me me tau muab tso rau hauv daim ntaub asbestos qis txias.

7 Kub tshav kub kub tom qab welding

Tshav kub kub yuav tsum tau nqa tawm tam sim ntawd tom qab txhuam siv kom tiv thaiv kom tsis txhob tsim cov kab tawg qeeb, tshem tawm kev ntxhov siab thiab txhim kho microstructure. Daim ntawv ntsuas kub ntawm preheat kub ua ntej welding thiab cua sov kev kho tom qab welding ntawm tshav kub-resistant hlau yog tsom hnyuv:


Ntsig

Thickness

Preheat kub ua ntej welding

Thaum tshav kub kub kho kub tom qab weldin g

SA387 Gr 12

≥ 10 hli

150-200

650-700

 

Nco ntsoov tias preheating ua ntej welding, txias tom qab welding thiab lwm yam kev ntsuas tsim nyog, tab sis qhov kub thiab txias tsis siab dua qhov zoo. Tsis tas li ntawd, tuab cov cua kub uas tiv taus steel phaj yuav tsum muaj ntau txheej ib zaug vuam thiab yuav tsum tsis txhob cuam tshuam, qhov kub nruab nrab ntawm cov txheej tsis qis tshaj qhov ntsuas kub. Thaum kawg, peb yuav tsum xyuam xim rau cov huab cua. Thaum lub ntsuas kub tsawg tsawg, lub chaw ntxhov siab nce qhov kub siab txias kom zoo dua kom tiv thaiv tau qhov kub ntawm ntog sai heev. Tib lub sij hawm, qee qhov kev ntsuas xwm ceev los siv tiv thaiv kom tsis txhob poob cua thiab nag.