304 Stainless Steel

1: What is the main chemical composition of 304 stainless steel?

A1: The main chemical composition of 304 stainless steel includes 18-20% chromium, 8-12% nickel, and the rest is iron. The addition of chromium forms a dense oxide film on the surface, which is the key to its corrosion resistance.

Q2: Why is 304 stainless steel suitable for food contact products?

A2: Firstly, it has good corrosion resistance and will not react with food acids, alkalis, or salts; secondly, it has no toxic substances precipitation, complying with international food safety standards such as FDA; thirdly, its surface is smooth and easy to clean, avoiding bacterial growth.

Q3: What is the maximum operating temperature of 304 stainless steel?

A3: The continuous operating temperature of 304 stainless steel can reach 870°C, and it can withstand short-term high temperatures of 925°C. However, when used above 450°C for a long time, its mechanical properties will gradually decrease.

Q4: Is 304 stainless steel magnetic?

A4: Under normal circumstances, 304 stainless steel is austenitic and non-magnetic. But after cold working (such as stamping, bending), a small amount of martensite will be formed, making it weakly magnetic. This phenomenon does not affect its material properties.

Q5: What is the difference between 304 and 304L stainless steel?

A5: The main difference is the carbon content. 304 stainless steel has a carbon content of ≤0.08%, while 304L is ≤0.03%. Lower carbon content makes 304L have better intergranular corrosion resistance, suitable for welding structures that require post-weld heat treatment.