Umahluko phakathi kwemigangatho kunye nokubekwa kwindawo ethile
I-GB/T 9948: Isebenza kwiipayipi zentsimbi ezingenamthungo kwiimeko zobushushu obuphakathi nophezulu (≤500℃) ezifanaukuqhekeka kwepetroliyamkwayeizixhobo zeekhemikhali, kwaye iphantsi komgangatho okhethekileyo wepayipi.
GB/T 5310: Yenzelwe ngokukodwaiibhoyila ezinoxinzelelo oluphezulu(iiparameter zomphunga ≥9.8MPa), igxininisa ukhuseleko lwexesha elide phantsi kobushushu obuphezulu kunye noxinzelelo oluphezulu kwaye yeyona migangatho iphambili yeetyhubhu zebhoyila.
Umahluko ophambili kwizinto eziphathekayo kunye nokusebenza
Ukwakheka kweekhemikhali
Xa kuthelekiswa nentsimbi engama-20,20GIntsimbi inolawulo olungqongqo phezu kokungcola (okufana ne-P≤0.025%, S≤0.015%), kwaye ifuna ukuba isixa sisonke sezinto eziseleyo (i-Cu, i-Cr, i-Ni, njl.njl.) sibe yi-≤0.70% ukuqinisekisa uzinzo kubushushu obuphezulu.
Iipropati zoomatshini
Amandla okutsalwa kobushushu begumbi angama-20G (410-550MPa) abonakala ngathi ahambelana nalawo entsimbi engama-20 (≥410MPa), kodwa i-20G kufuneka iqinisekise amandla okunyamezela obushushu obuphezulu kwi-450℃ (≥110MPa), nto leyo eyimfuneko ephambili kwiityhubhu zebhoyila.
Isakhiwo esincinci
I-20G kufuneka ihlolwe i-spheroidization grade ye-pearlite (≤ grade 4) ukuthintela ukonakala kwesakhiwo se-microstructure emva kwenkonzo yexesha elide yobushushu obuphezulu, ngelixa intsimbi ye-20G ingenalo olo mfuneko.
Umahluko kwinkqubo yokuvelisa
Unyango lobushushu
I-20G kufuneka ifumane unyango oluqhelekileyo (Ac3+30℃) ukuqinisekisa ubungakanani bengqolowa yebanga lesi-5 ukuya kwelesi-8. Intsimbi engama-20 inokutsalwa okanye ilungiswe, kwaye ulawulo lwenkqubo lukhululekile.
Uvavanyo olungatshabalalisiyo
I-20G ifuna ukufunyanwa kweziphene ze-ultrasonic nganye kunye novavanyo lwamandla e-eddy kwinxalenye nganye, ngelixa intsimbi ye-20G idla ngokufuna ukuhlolwa kweesampuli kuphela.
Ukuthelekiswa kweemeko zesicelo
20G: Iibhoyila zesikhululo samandla (iindonga ezipholiswe ngamanzi, ii-superheater), ii-reactors zekhemikhali ezinoxinzelelo oluphezulu (iimeko ezinobushushu obuyilwe > 350℃)
Intsimbi engama-20: Iipayiphu zeetyhubhu zokufudumeza izitofu kwiindawo zokucocisa, iipayipi zeeyunithi zokucocisa umoya kunye ne-vacuum (ubushushu buhlala bungaphantsi kwama-350℃)
Iimfuno zeSatifikethi
Imibhobho yentsimbi ye-20G kufuneka ifumane iLayisensi yokuVelisa izixhobo eziKhethekileyo (isiqinisekiso se-TS), kwaye ibhetshi nganye kufuneka inike ingxelo yovavanyo lokusebenza oluphezulu. Intsimbi ye-20 ifuna kuphela isatifikethi sokuqinisekisa umgangatho esiqhelekileyo.
Iingcebiso zokukhetha:
Xa kufikwa kwiiprojekthi zesatifikethi se-ASME okanye se-PED, i-20G inokuhambelanaSA-106B/ASTM A192, ngelixa intsimbi engama-20 ingenazo izinto ezihambelana ngqo nezixhobo ezisemgangathweni zaseMelika.
Kwiimeko zokusebenza ezingaphezulu kwama-540℃, kufuneka kuqwalaselwe iintsimbi ze-alloy ezifana ne-12Cr1MoVG. Umda ophezulu wobushushu obufanelekileyo kwi-20G yi-480℃ (ingongoma ebalulekileyo yokwenziwa kwe-graphitization yentsimbi yekhabhoni).
Ixesha leposi: Meyi-23-2025
