15CrMoG yog pearlitic tshav kub-resistant steel alloy yeeb nkab. "15" sawv cev rau cov ntsiab lus carbon ntawm kwv yees li 0.15%, "Cr" (chromium) cov ntsiab lus kwv yees li 1.0%-1.5%, thiab "Mo" (molybdenum) cov ntsiab lus kwv yees li 0.4%-0.6%. "G" qhia txog nws qhov tsim nyog rau kev kub siab boiler piping . 15CrMoG steel yeeb nkab nthuav tawm txhim kho qhov kub thiab txias tsis kam los ntawm kev sib ntxiv ntawm cov ntsiab lus xws li chromium thiab molybdenum.
Cov yam ntxwv tseem ceeb
Zoo heev High -Tsub Ua Haujlwm
Thermal Strength: Tensile zog Ntau dua los yog sib npaug rau 440MPa, yield zog Ntau dua los yog sib npaug rau 235MPa ntawm 500-550 degree, tswj cov qauv kev ruaj ntseg txawm tias lub sijhawm ua haujlwm ntev.
Oxidation Resistance: A dense oxide film forms on the surface, effectively resisting high-temperature oxidation corrosion and extending service life.
Hydrogen Corrosion Resistance: Hydrogen permeability yog txo los ntawm cov hlau alloy optimization, zam qhov kev pheej hmoo ntawm hydrogen embrittlement.
Tsawg-Tsuas Kub thiab Corrosion Resistance
Zoo toughness yog khaws cia txawm nyob rau hauv qis kub (piv txwv li, hauv qab -20 degree), tiv thaiv brittle puas.
Haum rau kev thauj cov corrosive media uas muaj leej faj, chlorine, thiab lwm yam, xws li hauv catalytic cracking units hauv kev lag luam petrochemical.
Microstructure Stability
Tom qab ntev -lub sij hawm siab- kub ua hauj lwm, lub microstructure yuav undergo pearlite spheroidization, tab sis cov txheej txheem no yuav ua tau qeeb heev los ntawm normalizing thiab tempering kub kho (raws li yuav tsum tau los ntawm tus neeg muag khoom), xyuas kom meej cov khoom ruaj khov.
Cov txheej txheem vuam siab yuav tsum tau ua
Weldability tsis zoo: Vim muaj cov ntsiab lus xws li chromium thiab carbon, muaj qhov tseem ceeb rau kev ua kom tawv, ua rau nws ua rau txias tawg.
Vuam specifications: Preheating rau 150-200℃yog yuav tsum tau. Siv tsawg-hydrogen electrodes (xws li R307) los yog sib txuas vuam hlau (xws li ER80S-B2L). Tom qab vuam tempering ntawm 715℃yog tsim nyog los txo cov kev ntxhov siab ntawm vuam thiab txhim kho kev sib koom tes.
Chemical Composition thiab Mechanical Properties
Cheebtsam Content Range (%)
Cov pa roj carbon (C) 0.12-0.18 Ua kom muaj zog, tab sis cov nyiaj ntau dhau txo qhov weldability.
Chromium (Cr) 0.80-1.10 Txhim kho qhov kub thiab txias oxidation kuj thiab corrosion kuj.
Molybdenum (Mo) 0.40-0.55 Txhim kho thermal zog thiab tsis kam mus rau hydrogen corrosion.
Silicon (Si) Tsawg dua los yog sib npaug rau 0.50 Deoxidizer, txhim kho fluidity.
Manganese (Mn) 0.40-0.70 Deoxidizer, ua kom muaj zog.
Mechanical Properties:
Tensile zog: 440-640MPa
Yield zog: Ntau dua los yog sib npaug rau 235MPa
Elongation: Ntau dua lossis sib npaug li 21%
Hardness: Tsawg dua los yog sib npaug rau 179HB (Brinell Hardness)
Cov cheeb tsam thov
Kev lag luam fais fab:
Cov kav dej siab thiab nruab nrab siab, lub taub hau, thiab cov raj superheater hauv cov hluav taws xob cog boilers nrog chav ntsuas ntawm 510 degree.
Siab -kub thiab siab - cov kua dej thauj cov tshuab nyob rau hauv lub nkoj ntim ntawm nuclear fais fab nroj tsuag.
Petrochemical Kev Lag Luam:
Cov cuab yeej tseem ceeb xws li catalytic cracking units, hydrogenation reactors, thiab siab -kub kub exchangers.
Kev thauj cov xov xwm corrosive xws li sulfur- muaj cov roj av thiab cov nkev ntuj.
Lwm cov teb:
Siab- cov kav dej tiv taus rau marine boilers thiab superheaters (ua raws li tus qauv GB5312).
Siab - cov cuab yeej siv tshuaj chiv (ua raws li GB6479 tus qauv), cov roj av tawg (ua raws li tus qauv GB9948), thiab lwm yam.