904L is an austenitic stainless steel. Though notably softer than 316L, its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids and in particular its copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid
Tuyau en acier inoxydable 904L, tôle d'acier 904L. 904L (UNS N08904, 1.4539) est un acier inoxydable austénitique fortement allié. Sa composition approximative est de 20 % Cr, 25 % Ni, 4.0 % Mo plus 1.5 % Cu, ce qui garantit un nombre équivalent de résistance aux piqûres (PREN) d'environ 43.