Canadian Welding Bureau (CWB) Level II Practice Exam

Martensitic and ferritic stainless steels are characterized as magnetic due to their body-centered cubic (BCC) or body-centered tetragonal (BCT) crystal structures. This ferromagnetic property allows these types of stainless steels to be attracted to magnets.

Martensitic stainless steels, which are formed through the heat treatment process, have a high carbon content that contributes to their hardness and strength while retaining magnetic properties. Similarly, ferritic stainless steels, which contain chromium and are generally less alloyed, also exhibit magnetic characteristics because of their BCC structure.

Understanding the magnetic nature of these steels is important in various applications, particularly in industries where magnetic qualities can signify their usability in specific environments or processes. Other types of stainless steels, like austenitic stainless steels, are typically non-magnetic due to their face-centered cubic (FCC) structure, which is important for distinguishing between different stainless steel grades in practice.