Isitokwe sepayipi lensimbi elingenamthungoI-ASTM A335 P91, ipayipi lensimbi elingenamthungo elisetshenziswa kumashubhu okubhayela, amashubhu okushintsha ukushisa nezinye izimboni, angasetshenziswa njengamapayipi ensimbi wezifudumezi eziphezulu zezinga lokushisa eliphezulu nezifudumezisi ezishisayo kuma-boilers angaphansi futhi aphakeme kakhulu anamazinga okushisa odonga ≤625°C, kanye namaheda odongeni Amazinga okushisa aphezulu. kanye namapayipi esitimu anamazinga okushisa ≤600℃ angasetshenziswa njengezishintshisi zokushisa zamandla enuzi kanye neyunithi yokuqhekeka kwe-petroleum amashubhu esithandweni.
I-ASTM A335 P91 iyinsimbi ye-alloy esezingeni lokushisa eliphezulu eyinsimbi ephansi ye-alloy chromium-molybdenum. Isetshenziswa kabanzi kumapayipi kanye nemishini ngaphansi kwezinga lokushisa eliphezulu kanye nezimo ezicindezelayo, njenge-petrochemical, amandla kagesi, izitshalo zamandla enuzi neminye imikhakha. Izingxenye eziyinhloko zalolu lwazi yi-chromium, i-molybdenum, ithusi, i-manganese, i-silicon, i-phosphorus, isulfure nezinye izakhi. Okuqukethwe kwe-chromium ne-molybdenum kuphakeme kakhulu, okungathuthukisa ukumelana nezinga lokushisa okuphezulu nokumelana ne-oxidation yento.
Impahla ye-ASTM A335 P91 inezici ezinhle kakhulu zokusebenzisa imishini futhi isengagcina amandla amahle kanye nokuqina ngaphansi kwezinga lokushisa eliphezulu kanye nezindawo ezinengcindezi ephezulu. Impahla ibuye imelane kakhulu ne-oxidation, enganweba ngokuphumelelayo impilo yesevisi yamapayipi nemishini. Ngaphezu kwalokho, impahla nayo inokusebenza okuhle kwe-welding, okwenza ukwakhiwa nokugcinwa kube lula.
Ngenxa yokuthi impahla ye-ASTM A335 P91 inalezi zakhiwo ezinhle kakhulu, isetshenziswa kabanzi ezindaweni ezithile zokushisa okuphezulu nasezindaweni ezinengcindezi ephezulu. Isibonelo, embonini ye-petrochemical, amapayipi nemishini eyenziwe nge-ASTM A335 P91 ingakwazi ukumelana nokuguguleka kwamakhemikhali nokugqwala ngaphansi kwamazinga okushisa aphezulu kanye nezingcindezi, iqinisekisa ukusebenza okuphephile kwemishini. Emkhakheni wamandla kagesi kanye nezitshalo zamandla enyukliya, amapayipi nemishini eyenziwe nge-ASTM A335 P91 ingamelana nokugqwala nokuguguleka kwesitimu nomhwamuko wamanzi neminye imidiya ngaphansi kwezinga lokushisa eliphezulu nokucindezela, iqinisekisa ukusebenza okuvamile kwemishini.