304 and 316L Stainless Steel
304 stainless steel and 316L stainless steel are the two trump materials in the austenitic family. Whether in daily tableware, architectural decoration, or in rigorous marine engineering and chemical equipment, they are often used.
This article will analyze the differences between 304 stainless steel and 316L stainless steel from the dimensions of chemical composition, corrosion resistance, mechanical properties, welding characteristics and cost.
The Difference of Chemical Component
304 and 316L stainless steel are both austenitic stainless steels, which are mainly distinguished by the content of Mo and C elements.
Mo element: The key element of 316L stainless steel.It contains 2.0%-3.0% Mo, but 304 stainless steel doesn’t contain Mo.
C element: Both are low carbon steels, but the "L" in 316L stands for "Low Carbon", and its carbon content is strictly controlled at ≤0.03%, which is lower than ≤0.08% in 304.
| Element | 304 Stainless Steel | 316L Stainless Steel |
| Cr | 18.0%-20.0% | 16.0%-18.0% |
| Ni | 8.0%-10.5% | 10.0%-14.0% |
| Mo | NOT | 2.0-3.0% |
| C | ≤0.08% | ≤0.03% |
The Comparison of Corrosion Resistance
In indoor or freshwater environments, there is almost no difference in the corrosion resistance between the two types of stainless steel. 304 stainless steel is sufficient to meet the needs of daily life such as in the kitchen, water cups, and decoration.
In an environment containing chloride ions, the corrosion resistance of 316L is much higher than that of 304 stainless steel, which is also the greatest value of 316L stainless steel.
In acidic media, the corrosion resistance of 316L stainless steel is also stronger than that of 304 stainless steel.
Welding corrosion: 316L is safer. Due to the lower carbon content of 316L compared to 304, it has superior intergranular corrosion resistance. After welding, 316L does not require annealing treatment and can still maintain its corrosion resistance.
The Difference of Physical Properties
The density of 304 is approximately 7.93 g/cm³, while 316L has a slightly higher density due to the presence of denser Mo elements, about7.98 g/cm³.
In terms of tensile strength and yield strength, 304 stainless steel is slightly higher than 316L stainless steel.
| Performance | 304 stainless steel | 316L stainless steel |
| Tensile strength | ≥515Mpa | ≥485Mpa |
| Yield strength | ≥205 MPa | ≥170 MPa |
| Elongation | ≥40% | ≥40% |
| Density | 7.93 g/cm³ | 7.98 g/cm³ |
The Difference of Application
304 stainless steel is suitable for inland, dry or freshwater contact environments. It is commonly used in kitchen equipment, food packaging and processing equipment, interior decoration, etc.
316L stainless steel is suitable for humid, coastal and highly acidic/alkaline environments, such as marine engineering projects, chemical equipment, and medical equipment, etc.
The Difference of Price
In addition to the impact of the application environment, price is also a key factor when selecting materials. In the inland environment, the performance of 304 stainless steel is not much different from that of 316L stainless steel. We can choose 304 stainless steel with higher cost performance. Because 316L contains Mo and more Ni, the price is about twice as high as 304 stainless steel. However, in coastal and high PH environments, the corrosion resistance of 316L is unmatched by 304 stainless steel.
Conclusion
The fundamental difference between 304 stainless steel and 316L stainless steel is whether it contains Mo. This difference directly determines their corrosion resistance in high chlorine environments, and also brings about a significant cost gap.If you have projects which need stainless steel materials, please contact us and we will share more details with you.
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Post time: Jun-17-2026
