What is the difference between ss304 and ss904l?

Stainless steel is widely used in various industries due to its corrosion resistance and durability.   Two popular grades of stainless steel are SS304 and SS904L, each with its own unique properties and applications.

 

Chemical composition of ss304

SS304, also known as 18-8 stainless steel, is the most common type of stainless steel.   It contains 18% chromium and 8% nickel, giving it good corrosion resistance and excellent formability.   SS304 is commonly used in applications where corrosion resistance is important, such as the food and beverage industry and construction and industrial applications.

 

Chemical composition of SS904L

SS904L,is a high-alloy austenitic stainless steel with higher chromium, nickel, and molybdenum content.   It contains 25% nickel and 4.5% molybdenum, which enhances its resistance to pitting and crevice corrosion in corrosive environments, such as those containing chlorides.   SS904L is commonly used in the chemical processing, pharmaceutical and petrochemical industries where resistance to corrosion and high temperatures is critical.   It is also known for its excellent weldability and formability.

 

Main differences

The main differences between SS304 and SS904L are their chemical composition and corrosion resistance.   While SS304 is suitable for general purpose applications and provides good corrosion resistance in many environments, SS904L is designed for use in highly corrosive environments where traditional stainless steel cannot be used.

 

In terms of cost

SS904L is generally more expensive than SS304 due to its higher alloy content and excellent corrosion resistance.   However, the higher initial cost of SS904L is generally justified by its longer service life and lower maintenance requirements in corrosive environments.

 

Conclusion

Both SS304 and SS904L are valuable materials in the stainless steel family, each serving a specific purpose based on its unique properties.   Understanding the differences between these grades is critical to selecting the correct material for a specific application and ensuring optimal performance and longevity.