1. What is 904L (N08904) Austenitic Stainless Steel Alloy?

904L (N08904) is a high-performance super austenitic stainless steel. It is specially designed to withstand extremely corrosive conditions, offering outstanding durability, weldability, and ease of processing.

2. Key Features of 904L (N08904) Austenitic Stainless Steel Alloy

(1) Excellent Corrosion Resistance: Performs well in sulfuric acid (0–98% concentration) and resists pitting and crevice corrosion in chloride-rich settings.

(2) High Nickel & Molybdenum Content: Enhances resistance to stress corrosion cracking in environments containing chlorides and hydrogen sulfide.

(3) Good Mechanical Properties: Tensile strength ≥490 MPa, elongation ≥35%, hardness ≤90 HB – ideal for pressure equipment.

3. Where is 904L (N08904) Austenitic Stainless Steel Alloy Used?

(1) Chemical Industry: Tanks, reactors, and piping for sulfuric acid.

(2) Oil & Gas: Equipment exposed to H₂S and chlorides.

(3) Seawater Systems: Heat exchangers, pumps, and valves.

(4) Luxury Goods: Used by brands like Rolex for watch cases due to its polish and rust resistance.

4. Comparison with Other Alloys

(1) vs. 316L: 904L offers better performance in sulfuric and chloride environments, though at a higher cost.

(2) vs. 6Mo Alloys: While 6Mo alloys have superior pitting resistance, 904L provides a more cost-effective solution for many applications.