904L is a high-alloy austenitic stainless steel with very high chromium, nickel, molybdenum, and copper content, offering superior corrosion resistance in highly aggressive environments especially sulfuric acid.
Key Properties
Corrosion: Exceptional resistance to sulfuric acid, phosphoric acid, and chlorides.
Pitting Resistance: High PREN value (>35) for superior pitting and crevice resistance.
Weldability: Good weldability with standard methods; no post-weld heat treatment required.
Formability: Excellent ductility for deep drawing and complex fabrication.
Common Applications
Chemical: Sulfuric acid storage tank internals, process piping supports, and heat exchanger baffles.
Pharmaceutical: Reaction vessel internals, processing line supports, and CIP system components.
Marine: Seawater cooling system brackets and offshore component mounts.
Pollution Control: Flue gas desulfurization (FGD) equipment supports and scrubber internals.