1 and 304 stainless steel are mainly composed of 18% chromium and 8% nickel, and contain a small amount of carbon and manganese, which makes 304 stainless steel have good corrosion resistance and oxidation resistance. While 204 stainless steel is mainly composed of chromium and manganese, and does not contain nickel.
2, 304 stainless steel is commonly used in food processing, chemical industry, medical equipment, building materials and other fields, especially suitable for occasions with high requirements for corrosion resistance and sanitary performance. However, due to its low corrosion resistance, 204 stainless steel is not suitable for occasions with high corrosion requirements, but it still has certain uses in some ordinary applications in low corrosion environments.