Umehluko phakathi kwezindinganiso kanye nokubekwa kwazo
I-GB/T 9948: Isebenza kumapayipi ensimbi angenamthungo ezimweni zokushisa eziphakathi nendawo neziphezulu (≤500℃) ezifanaukuqhekeka kwephethilolifuthiimishini yamakhemikhali, futhi ingeyendinganiso ekhethekile yamapayipi.
I-GB/T 5310: Yakhelwe ngqoamabhoyila anomfutho ophezulu(amapharamitha omusi ≥9.8MPa), igcizelela ukuphepha kwesikhathi eside ngaphansi kokushisa okuphezulu kanye nomfutho ophezulu futhi iyindinganiso eyinhloko yamapayipi ebhoyila.
Umehluko obalulekile ezintweni ezibonakalayo kanye nokusebenza kwazo
Ukwakheka kwamakhemikhali
Uma kuqhathaniswa nensimbi engu-20,20Ginsimbi inokulawula okuqinile phezu kokungcola (njenge-P≤0.025%, S≤0.015%), futhi idinga inani eliphelele lezinto ezisele (i-Cu, i-Cr, i-Ni, njll.) ukuthi libe yi-≤0.70% ukuqinisekisa ukuzinza kokushisa okuphezulu.
Izakhiwo zemishini
Amandla okuthambekela okushisa kwegumbi angu-20G (410-550MPa) abonakala ehambisana nawensimbi engu-20 (≥410MPa), kodwa i-20G idinga ukuqinisekisa amandla okukhuthazela okushisa okuphezulu ku-450℃ (≥110MPa), okuyisidingo esiyinhloko samashubhu ebhoyila.
Isakhiwo esincane
I-20G idinga ukuhlolwa ukuze kutholakale izinga le-spheroidization le-pearlite (≤ ibanga lesi-4) ukuze kuvinjelwe ukuwohloka kwesakhiwo esincane ngemva kwesevisi yesikhathi eside yokushisa okuphezulu, kuyilapho insimbi ye-20G ingenaso isidingo esinjalo.
Umehluko wenqubo yokukhiqiza
Ukwelashwa ngokushisa
I-20G kumele ibhekane nokwelashwa okuvamile (Ac3+30℃) ukuqinisekisa ukuthi usayizi wezinhlamvu zebanga lesi-5-8. Insimbi engu-20 ingafakwa noma ibekwe esimweni esifanele, futhi ukulawulwa kwenqubo kukhululekile.
Ukuhlolwa okungabhubhisi
I-20G idinga ukutholwa kwamaphutha e-ultrasonic kanye nokuhlolwa kwamanje kwe-eddy kwengcezu ngayinye, kuyilapho insimbi ye-20G ivame ukudinga ukuhlolwa kwesampula kuphela.
Ukuqhathaniswa kwezimo zohlelo lokusebenza
20G: Ama-boiler esiteshi sikagesi (izindonga ezipholiswe ngamanzi, ama-superheater), ama-reactor amakhemikhali anomfutho ophezulu (izimo ezinamazinga okushisa adizayinwe > 350℃)
Insimbi engu-20: Amashubhu okushisa izitofu ezindaweni zokuhluza, amapayipi amayunithi okuhluza anomoya kanye ne-vacuum (izinga lokushisa ngokuvamile lingaphansi kuka-350℃)
Izidingo Zesitifiketi
Amapayipi ensimbi angu-20G adinga ukuthola iLayisensi Yokukhiqiza Imishini Ekhethekile (isitifiketi se-TS), futhi ibhetshi ngalinye kumele linikeze umbiko wokuhlolwa kokusebenza okushisa okuphezulu. Insimbi engu-20 idinga kuphela isitifiketi sesiqinisekiso sekhwalithi ejwayelekile.
Iziphakamiso zokukhetha:
Uma kukhulunywa ngamaphrojekthi okuqinisekiswa kwe-ASME noma i-PED, i-20G ingahambisanaI-SA-106B/ASTM A192, kuyilapho insimbi engu-20 ingenakho ukuxhumana okuqondile nezinto ezijwayelekile zaseMelika.
Ezimweni zokusebenza ezingaphezu kuka-540℃, kufanele kucatshangelwe izinsimbi ze-alloy ezifana ne-12Cr1MoVG. Umkhawulo ophezulu wokushisa ofaneleka ku-20G ngu-480℃ (iphuzu elibalulekile lokuguqulwa kwe-graphitization yensimbi yekhabhoni).
Isikhathi sokuthunyelwe: Meyi-23-2025
