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317L is a low-carbon, molybdenum-bearing austenitic stainless steel designed for excellent corrosion resistance, particularly in aggressive chloride-containing and acidic environments.
Chemical Composition (UNS S31703)
Element
Composition (%)
Carbon (C)
max 0.03%
Chromium (Cr)
18.0 - 20.0%
Nickel (Ni)
11.0 - 15.0%
Molybdenum (Mo)
3.0 - 4.0%
Manganese (Mn)
max 2.0%
Silicon (Si)
max 0.75%
Phosphorus (P)
max 0.045%
Sulfur (S)
max 0.03%
Nitrogen (N)
max ~0.10%
Iron (Fe)
Balance
Key Element Functions
High Chromium + Nickel: Stabilizes the austenitic structure and provides excellent general corrosion and oxidation resistance.
High Molybdenum (3-4%): Significantly improves resistance to pitting and crevice corrosion in chloride environments and enhances resistance to certain acids.
Low Carbon Content: Maximum 0.03% carbon reduces carbide precipitation during welding, minimizing sensitization and intergranular corrosion.
Controlled Impurities: Low phosphorus and sulfur content maintains toughness, weldability, and corrosion resistance.
Design & Specification Note: Always refer to official standards or mill certificates for exact composition ranges, such as ASTM A240/A276 or EN/ISO equivalents. The essential chemical identity of 317L stainless steel is approximately 19% Cr, 13% Ni, 3-4% Mo, with very low carbon content.
