Piv nrog cov hlau, steel hlau tsis muaj cov nram qab no:
1. Siab electronegative tus nqi, kwv yees li 5 zaug uas cov pa hlau
2. Loj linear expansion coefficient yog 40% loj dua li ntawm cov hlau, thiab nrog kev nce ntawm qhov kub thiab txias, tus nqi ntawm linear expansion coefficient nce raws li.
3. Cov thermal conductivity tsis txaus, li 1/3 ntawm cov hlau.
Matters xav mloog :
1. Kev ceeb toom yuav tsum tau them nyiaj rau kev tiv thaiv kev sib txhuam ntawm corrocion los ntawm flange cover cua sov. Lub vuam tam sim no yuav tsum tsis txhob loj dhau, kwv yees li 20% tsawg tshaj carbon electrode, lub arc yuav tsum tsis txhob ntev dhau, kev sib tshuam interlayer yuav tsum ceev, thiab lub vos ntuag yuav tsum haum.
2. Thaum siv cov electrode, nws yuav tsum tau ceev cia. Ti-Ca hom yuav tsum tau qhuav rau 1 xuab moos ntawm 150 C. Cov qis-hom hydrogen yuav tsum tau qhuav rau 1 teev ntawm 200-250 C. (Nws tsis tuaj yeem qhuav, txwv tsis pub lub tsho yooj yim kom tawg thiab tev tawm ), yog li los tiv thaiv cov roj thiab lwm cov av ntawm cov txheej txheem ntawm electrode, thiaj li kom tsis txhob muaj cov ntsiab lus ntawm cov hlua thiab cuam tshuam qhov zoo ntawm cov hlua khi.
3. Carbides yog nag ntawm flanged kav los ntawm rov qab cua sov thaum lub vuam, uas txo txoj kev tawm tsam thiab qhov chaw ua haujlwm.
4. Lub nplaum flange ntawm chromium flange yeeb nkab tom qab welding yog loj thiab yooj yim keej. Yog hais tias tib hom chromium stainless hlau electrodes (G202, G207) siv rau kev siv, nws yog ib qhov tsim nyog yuav tau preheat saum 300 thiab qis-txias kho ib ncig ntawm 700 tom qab welding. Yog tias cov weldment tsis tuaj yeem kho cua sov tom qab siv vov, flange tub raj welding rods (A107, A207) yuav tsum xaiv.