The composition of grade 304 stainless steel typically includes the following elements:

Carbon (C): 0.08% maximum

Chromium (Cr): 18-20%

Nickel (Ni): 8-10.5%

Manganese (Mn): 2% maximum

Silicon (Si): 1% maximum

Phosphorus (P): 0.045% maximum

Sulfur (S): 0.03% maximum

These are the general composition ranges for grade 304 stainless steel. The percentages may slightly vary depending on the specific manufacturing standards or specifications.

The high chromium content in 304 stainless steel contributes to its excellent corrosion resistance, while the nickel content enhances its resistance to oxidation and provides stability at high temperatures. The combination of chromium and nickel makes it an austenitic stainless steel, which exhibits good formability, ductility, and weldability. The carbon content is kept low to maintain the steel's corrosion resistance and prevent sensitization to intergranular corrosion.

It's important to note that different manufacturers or suppliers may have slight variations in the composition of 304 stainless steel, but the general range mentioned above is widely accepted as the standard composition for this grade.