When it comes to stainless steel materials for critical applications, stainless steel 904L sheet and stainless steel 316L sheet are two common options. While both grades belong to the austenitic family, their performance and applications differ significantly.
Chemical Composition Comparison
- 316L Sheet – Contains around 16–18% chromium, 10–12% nickel, and 2–3% molybdenum.
- 904L Sheet – Higher nickel (23–28%) and molybdenum (4–5%) content, along with copper, giving it enhanced corrosion resistance.
Corrosion Resistance
- 316L – Performs well in moderate chloride environments but may fail in highly acidic conditions.
- 904L – Offers superior resistance to strong acids (sulfuric, phosphoric) and high-chloride environments like seawater.
Applications
- 316L Sheet – Food processing, medical equipment, architectural applications.
- 904L Sheet – Chemical processing, marine, oil & gas, pharmaceuticals, and desalination plants.
Cost Factor
- 316L Sheet – More economical and widely available.
- 904L Sheet – Higher cost but longer lifespan in aggressive conditions.
Final Verdict
If cost is the primary concern and the environment is moderately corrosive, 316L sheet is sufficient. However, for industries where failure is not an option, stainless steel 904L sheet is the superior investment.