What type of stainless steel is used for surgical instruments?

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

Answer: (B)

The key idea is that surgical instruments need a steel that can be sharpened to a very hard, durable edge and still withstand repeated sterilization. Martensitic stainless steels are designed to be heat-treated to high hardness, giving a sharp, long-lasting edge for blades and precise instruments. They can be tempered to balance hardness with toughness, which is important for cutting tools that must avoid chipping or breaking. While other stainless steels (like austenitic) resist corrosion well, they don’t reach the same level of hardness and edge retention after heat treatment, making them less ideal for instruments that require a fine cutting edge. Ferritic and duplex steels have properties that aren’t as well suited to the precision and edge-holding needs of surgical tools. So, martensitic stainless steel is the type typically used for surgical instruments.