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.
904L is an austenitic stainless steel. It is notably harder than 316L, and 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.
AISI 904L stainless steel (UNS N08904) is a high alloy austenitic stainless steel. Compared with 316L, SS904L has lower carbon (C) content, higher chromium (Cr) content, and approximatively twice the nickel (Ni) and molybdenum (Mo) content of 316L, which makes it have higher high temperature oxidation resistance, pitting resistance, and …
The most obvious ones are their composition and cost. 904L stainless steel is made up of iron, chromium, nickel, molybdenum, copper, nitrogen, and manganese, while 316L consists of iron, chromium, nickel and molybdenum. In terms of cost, 904L is more expensive than 316L due to its higher levels of nickel and molybdenum content.