Chiyambi

Mu dziko lovuta la mapaipi a mafakitale, komwe kutentha kwambiri ndi malo owononga zinthu ndizomwe zimachitika kawirikawiri, kusankha zinthu ndikofunikira kwambiri. Pakati pa zitsulo zosiyanasiyana za chromium-molybdenum (Cr-Mo), P9 imadziwika kuti ndi chinthu chodalirika komanso chapadera chomwe chimapangidwira kutentha kwambiri. Chitoliro cha Chitsulo cha Alloy P9 ndi mwala wapangodya womwe umagwiritsidwa ntchito kuyambira pakupanga magetsi mpaka kuyeretsa mafuta, womwe umayamikiridwa chifukwa cha kuphatikiza kwake kwapadera kwa mphamvu, kukana okosijeni, komanso kukhazikika kwa kapangidwe kake.

Kodi ndi chiyaniChitoliro chachitsulo cha aloyi P9?

Chitoliro cha P9 ndi dzina lochokera ku ASTM (American Society for Testing and Materials)Muyezo wa A335, yomwe imaphimba chitoliro chopanda chitsulo cha ferritic chopanda msoko kuti chigwiritsidwe ntchito kutentha kwambiri. "P" ikutanthauza chitoliro, ndipo "9" ikutanthauza kapangidwe kake ka mankhwala, komwe kali pakati pa 9% chromium ndi 1% molybdenum. Mankhwala apaderawa ndiye chinsinsi cha magwiridwe ake.

Makhalidwe Ofunika ndi Kulemba

Katundu waChitoliro chachitsulo cha P9amachokera ku zinthu zake zolondola zophatikizira:

•Chromium (Cr ~9%): Ichi ndi chinthu chachikulu chomwe chimapereka kukana kwambiri ku okosijeni (kukula) ndi dzimbiri, makamaka m'malo okhala ndi sulfure. Chimapanga gawo lokhazikika, loteteza la chromium oxide pamwamba pa chitsulo.

•Molybdenum (Mo ~1%): Molybdenum imawonjezera mphamvu ya chitsulo kwambiri kutentha kwambiri. Imathandiza kupewa kugwedezeka, kusinthasintha pang'onopang'ono kwa zinthu zomwe zimakhala ndi mphamvu nthawi zonse kutentha kwambiri.

Kapangidwe kameneka kamapatsa mapaipi a P9 ubwino wofunikira kwambiri:

•Mphamvu Yabwino Kwambiri Yotentha Kwambiri: P9 imasunga umphumphu wake wamakaniko komanso mphamvu yonyamula katundu pa kutentha komwe nthawi zambiri kumakhala mpaka 1100°F (593)°C), zomwe zimapangitsa kuti ikhale yoyenera kugwiritsa ntchito nthunzi yamphamvu komanso njira zoyendetsera ntchito.

•Kukana Kwabwino kwa Oxidation: Kuchuluka kwa chromium 9% kumapereka kusintha kwakukulu pakukana kwa okosijeni poyerekeza ndi zitsulo zochepa za alloy monga P11 kapena P22.

•Mphamvu Yowonjezereka Yophulika kwa Ma Creep: Kutha kwake kupirira kupsinjika kwakukulu ndi kutentha kwa nthawi yayitali popanda kulephera ndi chifukwa chachikulu chogwiritsira ntchito pazinthu zofunika kwambiri.

•Kukhazikika kwa Kapangidwe ka Zinthu: Chopangirachi chapangidwa kuti chisapangitse kuti chitsulocho chisapangike mosavuta pakapita nthawi pamene chikugwiritsidwa ntchito kutentha kwambiri.

Mapulogalamu Odziwika

Mapaipi a Alloy Steel P9 amagwiritsidwa ntchito kwambiri m'mafakitale komwe kutentha kwambiri kumakhala chinthu chosasintha:

•Kupanga Mphamvu: Machubu a Superheater ndi reheater, ma steam line akuluakulu, ndi mapaipi ena otentha kwambiri m'mafakitale opangira magetsi a zinthu zakale.

•Kuyeretsa ndi Kuyeretsa: Kusamutsa mizere m'malo oyeretsera, machubu otenthetsera, ndi mapaipi kuti agwiritsidwe ntchito ndi ma hydrocarbon otentha kwambiri.

•Kukonza Mankhwala: Potumiza mitsinje ya njira pa kutentha kwakukulu komwe kumafunikanso kukana dzimbiri.

Ubwino Woposa Ma Alloys Ena

Ngakhale pali ma alloy ambiri a Cr-Mo, P9 ili ndi gawo lake. Imapereka kukana kwa okosijeni komanso mphamvu zambiri kuposa alloy wamba wa 2.25% Cr (P22), popanda mtengo wokwera kwambiri komanso zovuta zowotcherera za banja la 9-12% Cr (P91). Izi zimapangitsa P9 kukhala chisankho chotsika mtengo komanso chabwino kwambiri pakugwiritsa ntchito kutentha kwapakati.

Mapeto

Chitoliro chachitsulo cha Alloy P9 ndi chinthu chotsimikizika komanso chofunikira kwambiri kwa mainjiniya opanga mapaipi otentha kwambiri. Kapangidwe kake koyenera ka 9% chromium ndi 1% molybdenum kamapereka mphamvu yokwanira, kukana okosijeni, komanso kulimba. Pa ntchito zomwe kudalirika pansi pa kutentha sikungatheke kukambirana, P9 ikupitilira kukhala yankho lodalirika komanso logwira ntchito bwino.