What is the difference between 316 and 316L stainless steel?
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Today, we will compare 316 and 316L stainless steel to explore the characteristics of these two materials in depth, help everyone understand the subtle differences between them, and point out in which cases one material is more suitable.
The main difference between the two is the carbon content.
316 stainless steel has a higher carbon content, usually around 0.08%, while 316L has a lower carbon content, about half of 316, which makes 316L stainless steel behave differently under certain specific conditions. The difference in carbon content directly affects the weldability of the material.
Due to the lower carbon content, 316L stainless steel is less prone to intergranular corrosion when welded at high temperatures, which is a significant advantage of 316L stainless steel.
316 VS 316L stainless steel chemical composition
| chemical composition | 316 | 316L |
|---|---|---|
| Carbon (C) | ≤0.08% | ≤0.03% |
| Silicon (Si) | ≤1.00% | ≤1.00% |
| Manganese (Mn) | ≤2.00% | ≤2.00% |
| Phosphorus (P) | ≤0.035% | ≤0.035% |
| Sulfur (S) | ≤0.03% | ≤0.03% |
| Nickel (Ni) | 10.0-14.0% | 10.0-14.0% |
| Chromium (Cr) | 16.0-18.5% | 16.0-18.5% |
| Molybdenum (Mo) | 2.0-3.0% | 2.0-3.0% |
If your project involves a lot of welding operations, then 316L is undoubtedly a more suitable choice.
In contrast, although 316 stainless steel also has a certain degree of corrosion resistance, it may not be as stable as 316L in an environment with frequent welding.
Next, let's look at their physical properties.
The two alloys are not very different in hardness and strength, and both can withstand a considerable degree of pressure and impact.
However, when it comes to corrosion resistance, 316 stainless steel usually performs better, and the higher molybdenum content makes it resistant to a wider range of chemical corrosion.
316 VS 316L stainless steel mechanical properties
| Mechanical Properties | 316 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Tensile Strength | 620 MPa MIN | 485 MPa MIN |
| Yield Strength | 310 MPa MIN | 170 MPa MIN |
| Elongation | 30% MIN | 30% MIN |
| Reduction of Area | 40% MIN | 40% MIN |
| Density | 8.03 g/cm³ | 7.93 g/cm³ |
| Hardness | - | HRB<90, HV<200, HBS<187 |
Therefore, if there is a strong risk of chemical corrosion in the application scenario, such as a marine environment or a chemical processing site, 316 will be a safer choice.
316 VS 316L stainless steel Application areas
316 stainless steel has excellent corrosion resistance and is often used in medical equipment, food processing equipment, marine structures and other fields.
316L stainless steel is widely used in chemical containers, piping systems, and structural parts that require a lot of welding due to its excellent welding performance.
