Is 316L stainless steel austenitic or martensitic?

316L stainless steel is fundamentally an austenitic stainless steel, known for its face-centered cubic structure, non-magnetic properties (in annealed state), excellent corrosion resistance (due to Molybdenum), and good formability, but it can transform into martensite under severe cold working, increasing magnetism and hardness.

 

Austenitic: Its primary structure is austenite, making it ductile and non-magnetic.

Low Carbon (L): The 'L' signifies low carbon content, improving weldability and preventing sensitization (carbide precipitation).

Molybdenum Content: Added for superior resistance to chlorides and pitting corrosion, making it "marine grade".