What are the four classification of stainless steel?

What are the four classification of stainless steel?

The four main classifications of stainless steel are:

  1. Austenitic stainless steel
  2. Ferritic stainless steel
  3. Martensitic stainless steel
  4. Duplex stainless steel


Each classification has its own unique characteristics and properties, and is used for different applications. For example, austenitic stainless steel is typically used in kitchenware and food processing equipment, while ferritic stainless steel is often used in automotive components. Martensitic stainless steel is often used in cutlery and in the medical industry. Duplex stainless steel is known for its high strength and corrosion resistance, making it suitable for use in marine environments and chemical processing equipment.


  • Austenitic stainless steel: This is the most common type of stainless steel and is characterized by its non-magnetic properties and excellent corrosion resistance. It is also known for its high ductility and toughness, making it easy to form and weld. It contains high levels of chromium and nickel, making it resistant to corrosion in both acidic and basic environments. It is commonly used in kitchenware, food processing equipment, and medical and dental instruments.
  • Ferritic stainless steel: This type of stainless steel has a similar composition to austenitic stainless steel but with a lower amount of nickel. As a result, it is less expensive than austenitic stainless steel and is also magnetic. Ferritic stainless steel is known for its excellent resistance to stress corrosion cracking and is often used in automotive components and in the construction of power plants.
  • Martensitic stainless steel: This type of stainless steel is known for its high strength and hardness, making it ideal for use in cutlery and surgical instruments. It is also magnetic and can be heat-treated to achieve a range of properties. However, it is not as corrosion-resistant as austenitic and ferritic stainless steels.
  • Duplex stainless steel: Duplex stainless steel is a combination of austenitic and ferritic stainless steel, resulting in a material with high strength and excellent corrosion resistance. It is known for its high resistance to stress corrosion cracking and is often used in marine environments and chemical processing equipment.

Please note that these are general description and properties may vary depending on the grade and composition of the stainless steel.

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