Ukumelana nokuqhekeka okushisayo kwe-sulfide corlosion.
Amapayipi ensimbi angenamthungo asetshenziswa kuzinhlelo zokusebenza ezidinga ukucaciswa okuphezulu ukuze kube lula ukufakwa nokunemba kokusebenza kanye nesicelo. Izinhlobo ezahlukahlukene zisetshenziselwa izinzuzo ezahlukene zemishini. Izicelo eziningi zidinga ukufudumala okuningi, ngakho-ke amapayipi ensimbi we-alloy alungile kubo. Abanye baphansi ngamandla kodwa baphakeme ekumelaneni nokugqwala, kanti abanye baphakeme ngamandla. Sinikeza amandla aphezulu wensimbi yamapayipi ensimbi aphansi kumabanga ahlukahlukene nosayizi.
Ekhuluma ngokuqinile, yonke insimbi iyi-alloy, kepha hhayi yonke insimbi ebizwa ngokuthi "ama-alloy steel". Ama-steel elula kakhulu yi-iron (FE) ahlanganiswe nge-carbon (c) (cishe ngo-0,1% kuya ku-1%, kuya ngohlobo) futhi akukho okunye (ngaphandle kokulandela okungalungile ngokungcola okuncane); Lokhu kubizwa ngokuthi ama-carbon sten. Kodwa-ke, igama elithi "i-alloy lensimbi" liyisikhathi esijwayelekile esibhekisa kuma-steel Ama-alloyants ajwayelekile afaka i-manganese (okuvame kakhulu), i-nickel, i-chromium, i-molybdenum, i-begadium, i-silico, ne-boron. Ama-alloya ajwayelekile ajwayelekile afaka i-aluminium, i-cobalt, yethusi, i-cersium, i-niobium, i-titanium, i-tungsten, uthini, i-zinc, ukuhola, ne-zirconium.
I-A335 P5, P9, P11, P12, P22, P91 Grade Alloy Steel Amapayipi angenamswakama athutheke ezikhwameni zepulasitiki, kanti izingcezu zenziwe ngezinto ezipakishe amanzi futhi ziboshwe ngezintambo ze-nylon. Kukhona ilebula ecacile ngaphandle kwephakheji yokuhlonzwa okulula kwenani ne-ID yomkhiqizo ngokunakekelwa okukhulu ngesikhathi sokuphatha nokuthumela.
