Stainless Steel 309 vs 310 – What’s the Difference

Stainless Steel 309 vs 310

Stainless steel is a highly durable and versatile material extensively used in various industrial and commercial applications. The popularity of stainless steel can be attributed to its unique properties, including resistance to corrosion, high-temperature tolerance, and high strength-to-weight ratio. Among the various types of stainless steel, 309 and 310 are two popular grades used for high-temperature applications. However, many people need help understanding the differences between these two grades. In this post, we will look closer at the dissimilarities between stainless steel 309 and 310 and help you decide when selecting the appropriate grade for your application.

Difference Between Stainless Steel 309 and Stainless Steel 310

Chemical Composition:

The chemical composition of stainless steel 309 and 310 is different. Stainless steel 309 contains 20% chromium and 12% nickel, while stainless steel 310 contains 25% chromium and 20% nickel. Due to the higher nickel content in 310, it has higher corrosion resistance than 309.

High-Temperature Resistance:

Both stainless steel 309 and 310 are designed to withstand high temperatures. However, 310 is more effective than 309 in high-temperature applications due to its higher nickel content. Stainless steel 310 also has a lower coefficient of thermal expansion, making it more resistant to thermal shock.

Mechanical Properties:

Stainless steel 309 and 310 possess different mechanical properties. Compared to 310, 309 has a lower tensile strength and provides less resistance to oxidation during prolonged exposure to high temperatures. On the other hand, 310 has a higher tensile strength, enabling it to withstand high-stress conditions.


Stainless steel 309 is commonly used in furnaces for fluidized bed boilers, cement plants, and petrochemical industries. It is also used for welding dissimilar steel and overlaying carbon steel. On the other hand, stainless steel 310 is commonly used to produce furnace components, exhaust systems, and heat-treating equipment. It is also used in the manufacturing of aircraft and aerospace parts.


The cost of stainless steel 309 is relatively lower than that of 310. Stainless steel 309 is a more economical option than 310 for applications where high temperatures are not required and less corrosion resistance is adequate.


In conclusion, stainless steel 309 and 310 are excellent for high-temperature applications. While stainless steel 309 is less expensive than 310, it is less durable and resistant to corrosion. Stainless steel 310, on the other hand, boasts higher tensile strength better corrosion resistance, and is appropriate for applications requiring high-temperature resistance. Understanding the differences between the grades can help you choose the right material for your application. Selecting the correct grade of stainless steel is crucial in ensuring your product’s or equipment’s durability and safety.



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