Cov pa roj carbon monoxide yog ib qho tseem ceeb ntawm cov hlau alloying hauv cov cua sov cam khwb cia hlau. Nws ncaj qha cuam tshuam qhov kub thiab txias zog, nkag siab tsis kam, oxidation tus cwj pwm, castability, thiab microstructural stability.
Cov ntsiab lus ntawm cov pa roj carbon monoxide hauv cov cua sov cam khwb cia hlau yog li ntawm 0.07 mus rau 0.75 feem pua ntawm qhov hnyav, sib txawv ntawm qib thiab daim ntawv thov. Cov pa roj carbon tsawg nyob ib puag ncig 0.07 txog 0.15 feem pua yog siv rau hauv siab chromium martensitic steels rau chav turbine casings ua haujlwm ze 600 degrees Celsius, qhov twg zoo toughness thiab weldability yuav tsum tau. Qhov nruab nrab ntawm 0.2 mus rau 0.5 feem pua yog muaj nyob rau hauv ntau qib austenitic tshav kub resistant rau cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov raj hloov kho. Cov pa roj carbon ntau txog li 0.75 feem pua tshwm sim hauv qee cov qib nickel chromium rau cov ntaub ntawv tsis muaj zog heev xws li ethylene cracking furnace tubes.
Cov pa roj carbon ua haujlwm feem ntau yog austenite stabilizer thiab carbide qub. Thaum qhov kub thiab txias, carbon sib xyaw nrog chromium, niobium, tungsten, thiab lwm yam carbide tsim cov ntsiab lus los tsim cov precipitates ruaj khov xws li M23C6 thiab M7C3 hom carbides. Cov carbides pin lis ciam teb, cuam tshuam kev txav mus los, thiab muab nag lossis daus ntxiv, uas ua rau muaj kev cuam tshuam loj heev ntawm kev sib tsoo lub zog thiab kub tensile zog.
Txawm li cas los xij, cov ntsiab lus carbon yuav tsum ua tib zoo sib npaug. Cov pa roj carbon monoxide nce hardness thiab chav kub yield zog tab sis txo ductility thiab cuam tshuam toughness. Cov pa roj carbon ntau dhau ua rau coarse carbide tes hauj lwm ntawm cov ciam teb, uas tuaj yeem ua rau cov khoom siv thiab txo cov thermal qaug zog. Nyob rau hauv chromium nplua nuj alloys, cov pa roj carbon ntau kuj khi chromium hauv carbides, muaj peev xwm txo cov chromium muaj nyob rau hauv kev tiv thaiv Cr2O3 oxide txheej, yog li txo qis oxidation tsis kam. Vim li no, cov qib kub kub uas yuav tsum tau muaj kev tiv thaiv oxidation zoo heev feem ntau khaws cov pa hauv nruab nrab ntawm 0.2 mus rau 0.4 feem pua thaum ntxiv cov khoom muaj zog carbide zoo li niobium kom ua tiav kev ntxiv dag zog tsis tas siv chromium ntau dhau.
Castability kuj txhim kho nrog cov pa roj carbon ntau dua. Carbon tsub kom fluidity ntawm cov hlau molten, txo shrinkage porosity, thiab pab tiv thaiv kub tearing. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov duab cam khwb cia xws li lub cub tawg, grate tuav, thiab cov raj hloov kho.
Cov qauv piv txwv muaj xws li ZG40Cr25Ni20Si2 nrog kwv yees li 0.4 feem pua cov pa roj carbon monoxide rau kev sib npaug thiab lub zog, thiab cov qib qis carbon martensitic uas muaj 0.08 mus rau 0.13 feem pua cov pa roj carbon monoxide rau kev siv chav turbine. Nyob rau hauv txhua rooj plaub, cov ntsiab lus ntawm cov pa roj carbon zoo yog txiav txim siab los ntawm cov kev pabcuam tshwj xeeb, cov khoom siv thauj khoom, ib puag ncig corrosion, thiab lub neej yuav tsum tau ua.
