The Differences Between SUS316 and SUS316L
2025/9/26
Within austenitic stainless steels (known for their corrosion resistance, strength, and weldability), two of the commonly used grades are SUS316 and SUS316L. The “L” stands for “Low Carbon,” and carbon content plays a key role in determining a steel's properties.
SUS316 has a carbon content of 0.08% or less. It also contains about 18% chromium, 10–14% nickel, and 2.5% molybdenum, among other elements. The addition of molybdenum significantly improves its corrosion resistance and pitting resistance.
SUS316L has a carbon content of 0.03% or less. SUS316L also contains more nickel than SUS316 (12-15% more), further enhancing its corrosion resistance.
The 2 main differences between SUS316 and SUS316L are the following:
Workability
Intergranular corrosion resistance
Workability
SUS316L is easier to machine, weld, and process than SUS316 due to its lower carbon contents.
Intergranular corrosion resistance
At 500–800°C (932–1,472°F), stainless steels can form chromium carbide along grain boundaries, depleting chromium and weakening the protective oxide film. This leads to intergranular corrosion, particularly after welding. Because SUS316L has less carbon atoms to bind with chromium, giving SUS316L superior resistance to intergranular corrosion.
Key Takeaways
The main differences between SUS316 and SUS316L are workability and intergranular corrosion resistance.
The “L” grade (Low Carbon) improves both corrosion resistance and processing performance.
SUS316L is especially suitable for welded components and applications requiring strong protection against intergranular corrosion.
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