What does the term "18-8 stainless" refer to in stainless steel?

The term "18-8 stainless" specifically denotes a type of stainless steel that contains 18% chromium and 8% nickel. This composition is crucial because chromium enhances corrosion resistance, making the steel more durable and suitable for a variety of environments, including exposure to moisture and corrosive substances. Nickel, on the other hand, improves the alloy's toughness and formability, allowing it to be easily manufactured into various shapes and structures.

This specific combination of chromium and nickel is typical in austenitic stainless steels, which are known for their good weldability and flexibility, making them popular in both industrial and household applications, such as kitchen equipment and chemical containers. Thus, 18-8 stainless steels are often referred to as type 304 stainless steel, widely used due to their excellent mechanical properties and resistance to oxidation and corrosion.

Other options do not accurately represent the standard nomenclature of stainless steel compositions, which is primarily characterized by the chromium and nickel content.