What Is The Difference Between 304 Stainless Steel and 316 Stainless Steel Finish On Fasteners

304 stainless steel and 316 stainless steel are two different types of finishes of fasteners. The main difference between these two types of finishes is what environment they are best suited for and their composition. 

Benefits of 316 Stainless Steel

316 stainless steel contains an addition of molybdenum, which makes 316 stainless steel more corrosion-resistant than 304. 316 stainless steel has higher nickel and molybdenum content making it generally stronger than 304. The high molybdenum content in 316 allows it to perform better than 304 in extreme heat. 316 also has better tensile and yield strength properties. 

When 316 Should Be Used

316 stainless steel is best known for its corrosion resistance in environments where chloride exposure is a high concern, such as marine environments or industrial settings with corrosive chemicals. Other common applications include marine hardware, chemical processing equipment, pharmaceutical equipment, and surgical instruments. 

316 stainless steel fasteners have a dull, matte finish. 316 offers the highest level of corrosion-resistant protection but sacrifices some aesthetic appeal. 

Benefits of 304 Stainless Steel

304 stainless steel is often referred to as “18-8” stainless steel due to its composition. 304 stainless steel is corrosion-resistant however, it is not as resistant to chloride environments as 316. 304 is more susceptible to localized corrosion in chloride containing environments. 304 is also generally less expensive than 316 stainless steel. 

When 304 Should Be Used

304 stainless steel is commonly used in applications such as kitchen appliances, food processing equipment, architectural structures, and automotive components. 304 stainless steel may be used for construction and building applications that do not require high corrosion resistance. 304 is more cost effective for applications where corrosion resistance is not the main concern. 

304 stainless steel fasteners generally have a smoother, more polished finish, making them ideal for applications where aesthetics matter. 

Conclusion 

Choosing between 304 and 316 stainless steel is dependent on the requirements of your application. The main distinguishing factor between the two grades is the level of corrosion resistance needed.