904L (N08904) round steel, seamless pipe, wire, forgings, ingots, flanges, plates, and strip materials. "904L domestic grade 00Cr20Ni25Mo4.5Cu, American standard N08904, varies with different uses. C content <= 0.02% or 0.03%. It has a high chromium content and sufficient nickel content, and the addition of copper gives it strong acid resistance."