300 series stainless steel refers to a family of austenitic stainless steels that contain chromium and nickel as primary alloying elements. The most common alloys in the 300 series are Type 304 and Type 316, which contain 18% chromium and 8-10% nickel. These steels are non-magnetic and offer excellent corrosion resistance, high strength, and good formability.

300 series stainless steel is commonly used in a wide range of applications, including food processing equipment, chemical processing equipment, medical devices, automotive components, and architectural applications. It is highly resistant to corrosion from a wide range of environments, including acidic and alkaline solutions, high temperatures, and high-pressure environments.