What is the difference between 304 and 304L stainless steel grades

Both 304 and 304L are austenitic stainless steels, with the core difference being the carbon content: 304L has a carbon content of ≤0.03% (ultra-low carbon) and stronger resistance to intergranular corrosion after welding, making it suitable for chemical equipment that requires welding; 304 stainless steel has a higher carbon content (≤0.08%) and better high-temperature strength, but requires solution treatment after welding.

Both 304 and 304L stainless steel grades have similar corrosion resistance, but 304L is more suitable for acidic or high-temperature environments due to its low-carbon characteristics; 304 stainless steel is widely used in conventional scenarios such as food processing and architectural decoration, and should be avoided from long-term exposure to highly corrosive media.