Is 304 more corrosion resistant than 304L?
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304 vs 304L Chemical Composition
| Grade | Carbon Content | Key Alloying Elements |
|---|---|---|
| 304 | ≤0.07% | 18% Cr + 8% Ni |
| 304L | ≤0.03% | 18% Cr + 8% Ni (extra-low carbon) |
304 vs 304L Corrosion Resistance
304 stainless steel Intergranular corrosion risk:
After welding or high-temperature processing, carbon easily combines with chromium to form chromium carbide, resulting in chromium depletion at the grain boundary and weakening corrosion resistance. When used for a long time in the sensitization temperature zone (425-815°C), the risk of intergranular corrosion increases significantly.
304L stainless steel Intergranular corrosion risk:
Low-carbon design (≤0.03%) greatly reduces the precipitation of chromium carbide and effectively prevents chromium depletion at the grain boundary.
Corrosion resistance can be maintained without heat treatment after welding, suitable for welding structural parts (such as pressure vessels and pipelines).
Non-welded state: The corrosion resistance of 304 and 304L is basically the same, and both can resist corrosion from the atmosphere, fresh water, and food-grade media (such as acidic juice).
304 welded state: The corrosion resistance of 304L is significantly better than that of 304, especially in chloride ion or acidic environments (such as seawater desalination equipment and chemical containers).
304 corrosion resistant plate
