Normandy Metal Industry Co., Ltd.
Normandy Metal Industry Co., Ltd.

409 Stainless Steel vs 304 Stainless Steel: Which is Better?

Jun 12 , 2024

When it comes to choosing the right type of stainless steel for your project, understanding the differences between various grades is crucial. As for 409 ss vs 304 ss, the two commonly used grades 409 and 304 stainless steel both have their own set of properties, advantages, and applications. This article will delve into the specifics of these two types of stainless steel to help you make an informed decision.

Is 304 or 409 Stainless Steel Better?

The answer to whether 304 or 409 stainless steel is better depends largely on the specific requirements of your application.

304 Stainless Steel: Known for its excellent corrosion resistance, 304 stainless steel is often used in environments where exposure to corrosive elements is a concern. It is also highly formable and weldable, making it a versatile choice for a wide range of applications.

409 Stainless Steel: While not as corrosion-resistant as 304, 409 stainless steel coil offers good oxidation and corrosion resistance at higher temperatures. It is also more affordable, making it a cost-effective option for applications where extreme corrosion resistance is not a primary concern.


Difference Between 304 and 409 Stainless Steel

Understanding the key differences between 304 and 409 stainless steel can help you choose the right material for your needs.


  • 304 Stainless Steel: Contains 18% chromium and 8% nickel, which contribute to its high corrosion resistance.

  • 409 Stainless Steel: Contains 11% chromium and no nickel, making it less resistant to corrosion but more affordable.

Corrosion Resistance:

  • 304 Stainless Steel: Offers superior corrosion resistance, making it ideal for use in harsh environments.

  • 409 Stainless Steel: Provides adequate corrosion resistance for many applications but is not suitable for highly corrosive environments.

Temperature Resistance:

  • 304 Stainless Steel: Can withstand temperatures up to 870°C (1600°F).

  • 409 Stainless Steel: Performs well at higher temperatures, up to 675°C (1250°F), but not as high as 304 ss plate.


  • 304 Stainless Steel: Generally more expensive due to its higher nickel content.

  • 409 Stainless Steel: More cost-effective, making it a popular choice for budget-conscious projects.

Stainless Steel Exhaust: 304 vs 409

When it comes to exhaust systems, the choice between 304 and 409 stainless steel can significantly impact performance and longevity.

  • 304 Stainless Steel Exhaust: Offers excellent corrosion resistance, making it ideal for high-performance and long-lasting exhaust systems. It is also more aesthetically pleasing due to its shiny finish.

  • 409 Stainless Steel Exhaust: While not as corrosion-resistant as 304, 409 stainless steel is still a popular choice for exhaust systems due to its affordability and adequate performance in less corrosive environments.

Differences of Stainless Type 304, 316, and 409

While 304 and 409 are commonly compared, it’s also useful to understand how 316 stainless steel plate fits into the picture.

  • 304 Stainless Steel: Offers excellent corrosion resistance and is highly versatile.

  • 316 Stainless Steel: Contains molybdenum, which provides even greater corrosion resistance, especially against chlorides and other industrial solvents.

  • 409 Stainless Steel: More affordable and offers good performance at higher temperatures but lacks the corrosion resistance of 304 and 316.

316 stainless steel sheet price

Aluminized Steel vs 409 Stainless Steel

Aluminized steel is another material often compared to 409 stainless steel, especially in automotive applications.

  • Aluminized Steel: Coated with an aluminum-silicon alloy, it offers good corrosion resistance and heat reflectivity. It is often used in exhaust systems and heat shields.

  • 409 Stainless Steel: Offers better overall durability and higher temperature resistance compared to aluminized steel. It is also more resistant to rust and corrosion over time.

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