Cutlery and bearings are made from what type of stainless steel?

Cutlery and bearings are made from what type of stainless steel?

• A. Martensitic
• B. Austenitic
• C. Ferritic
• D. Duplex

Answer: (A)

Martensitic stainless steels are the heat-treatable kind that can be hardened to high levels of hardness and wear resistance. For cutlery, especially knife blades, and for bearing surfaces, this hardness is essential to maintain a sharp edge and to resist wear over time. Austenitic stainless steels resist deep hardening by heat treatment and are excellent for corrosion resistance and ductility, but they don’t achieve the same high hardness needed for edge retention and bearing wear life. Ferritic and duplex steels have other strengths and corrosion profiles but aren’t typically chosen when the priority is achieving hardness through heat treatment. So, martensitic stainless steel best fits both needs: sharp, durable blades and hard, wear-resistant bearing surfaces.

Martensitic stainless steels are the heat-treatable kind that can be hardened to high levels of hardness and wear resistance. For cutlery, especially knife blades, and for bearing surfaces, this hardness is essential to maintain a sharp edge and to resist wear over time. Austenitic stainless steels resist deep hardening by heat treatment and are excellent for corrosion resistance and ductility, but they don’t achieve the same high hardness needed for edge retention and bearing wear life. Ferritic and duplex steels have other strengths and corrosion profiles but aren’t typically chosen when the priority is achieving hardness through heat treatment. So, martensitic stainless steel best fits both needs: sharp, durable blades and hard, wear-resistant bearing surfaces.