Which series of stainless steel contains chromium but no nickel?

The 400 series of stainless steel is characterized by its composition, which typically includes chromium but no nickel. This series is primarily known as a ferritic stainless steel, which means it has a body-centered cubic structure and is magnetic. The presence of chromium provides corrosion resistance, but the absence of nickel makes it more cost-effective and suitable for specific applications where high levels of corrosion resistance are not critical.

In contrast, other series of stainless steel have different compositions. The 100 series does not exist within the standard classifications of stainless steel. The 200 series contains nickel and typically features some manganese as a substitute for nickel, while the 300 series is known for its high nickel content, contributing to its excellent corrosion resistance and formability. Hence, the distinguishing factor for the 400 series is its lack of nickel alongside its chromium content, leading to its specific applications in situations where both heat resistance and moderate corrosion resistance are needed, such as in automotive and industrial applications.