Stainless steel is widely used in various industries for its properties, including corrosion resistance, durability, and strength. However, not all types of stainless steel are equal. The two most popular types of stainless steel are duplex stainless steel and 316. Although both types are stainless steel, they differ in properties, composition, and applications. In this blog post, we will closely examine duplex stainless steel vs 316 stainless steel and what makes them different.
Difference Between Duplex Stainless Steel and 316
Composition
Duplex stainless steel contains a combination of austenitic and ferritic phases, giving it superior properties to 316 stainless steel. On the other hand, 316 stainless steel is an austenitic stainless steel composed primarily of austenite, a face-centered cubic crystalline structure.
Corrosion Resistance
Duplex stainless steel has superior corrosion resistance, especially in environments that contain chloride and other corrosive chemicals. In contrast, 316 stainless steel has good corrosion resistance but is less effective than duplex stainless steel in corrosive environments.
Strength and Durability
Due to its duplex structure, duplex stainless steel is stronger and more durable than 316 stainless steel. It has a higher tensile strength and yield strength, making it suitable for applications that require high strength and toughness. On the other hand, 316 stainless steel is weaker than duplex stainless steel but more ductile and malleable, making it easier to form and modify.
Applications
Due to its superior corrosion resistance and strength, duplex stainless steel is commonly used in chemical and petrochemical industries, oil and gas refineries, marine structures, and desalination plants. 316 stainless steel, on the other hand, is widely used in food and beverage industries, medical equipment, hardware, and construction applications.
Cost
Duplex stainless steel is generally more expensive than 316 stainless steel due to its superior properties and complex manufacturing process. However, the cost of using duplex stainless steel can be offset by the long-term benefits of durability and corrosion resistance in corrosive environments.
Conclusion:
In conclusion, duplex stainless steel and 316 stainless steel have unique properties and characteristics. Duplex stainless steel is superior in corrosion resistance, strength, and durability but is more expensive than 316 stainless steel. Conversely, 316 stainless steel is less expensive, more malleable, and ductile, making it easier to work with. When choosing between duplex stainless steel and 316 stainless steel, it is crucial to consider factors such as the environment, application, and cost. With the right selection, both materials can provide excellent performance and durability in various industrial applications.