ER316L is a low-carbon stainless steel filler metal (like wire or rod) used for welding austenitic stainless steels, offering excellent corrosion resistance, especially to pitting from acids, due to its molybdenum content, with good weldability, ductility, and crack resistance, making it ideal for marine, food processing, and pharmaceutical industries. The "L" signifies low carbon (<0.03%), preventing intergranular corrosion after welding, and it's great for cryogenic applications too.
Key Characteristics:
Composition: Contains approximately 18% Chromium, 12% Nickel, and 2% Molybdenum.
Corrosion Resistance: Excellent resistance to general corrosion, pitting (due to Mo), and intergranular corrosion (due to low C).
Weldability: Good ductility, arc stability, and crack resistance due to small amounts of ferrite in the weld deposit.
Temperature Performance: Resists scaling at elevated temperatures (up to 850C) and performs well in cryogenic conditions (down to -196C or lower).
Applications:
Welding of 304L, 316L, and other molybdenum-bearing stainless steels.
Marine, food and beverage, pharmaceutical, and chemical processing equipment.
Cryogenic equipment.
Benefits of Low Carbon (L Grade):
The low carbon content (typically 0.03% max) prevents carbide precipitation at grain boundaries during welding, which would otherwise cause sensitization and susceptibility to intergranular corrosion.