What is the ASTM equivalent of 904L?
The UNS number for 904L is N08904, which corresponds to European standard 1.4539 (EN).
904L stainless steel has high nickel (23-28%), molybdenum (4-5%), and copper (1-2%) content, which makes it have excellent corrosion resistance in sulfuric acid, phosphoric acid and chloride environments. It is widely used in the chemical, marine engineering and pharmaceutical industries. Choose the corresponding standard according to the application (such as pressure vessels, pipelines) and material form (plates, pipes). For example, A240 is preferred for plates, A358 for high-temperature welded pipes, and B677 for pipes in highly corrosive environments.
Plates, sheets and strips
ASTM A240/A240M: Chromium-nickel stainless steel plates for pressure vessels and general purposes, explicitly including 904L (UNS N08904).
ASTM A480/A480M: General standard for stainless steel plates, sheets and strips, suitable for corrosion-resistant environments.
Pipes
ASTM A312/A312M: Seamless, welded and fabricated stainless steel pipes for pressure piping systems (such as chemical and petroleum industries).
ASTM B677: Seamless nickel alloy pipes for highly corrosive environments (such as sulfuric acid and phosphoric acid media).
ASTM A358: Welded austenitic stainless steel pipes for high temperature and high pressure (such as nuclear power plants and heat exchangers).
Bars and profiles
ASTM A276/A276M: Stainless steel bars and strips for mechanical components or structural parts.
Fittings and fasteners
ASTM A403: Stainless steel butt-weld fittings (elbows, tees, etc.).
ASTM A479: Stainless steel bars and profiles for the manufacture of fasteners.
Welding material standards: ER385 welding wire or E385 welding rod (ASTM A5.9) is recommended for welding.