ALOY 904L • UNS N08904 • WNR 1.4539

UNS NO8904, wanda akafi sani da 904L, ƙaramin carbon high alloy austenitic bakin karfe wanda ake amfani dashi sosai a aikace-aikace inda abubuwan lalata na AISI 316L da AISI 317L basu isa ba.

Ƙarin jan ƙarfe zuwa wannan matakin yana ba shi kaddarorin juriya na lalata fiye da na yau da kullun na chrome nickel bakin karfe, musamman ga sulphuric, phosphoric da acetic acid. Duk da haka, akwai iyakacin amfani da acid hydrochloric. Har ila yau, yana da babban juriya ga pitting a cikin maganin chloride, babban juriya ga duka kullun da lalata lalata. Alloy 904L yayi mafi kyau fiye da sauran austenitic bakin karfe saboda mafi girma gami da nickel da molybdenum.