SUS304 vs SUS316 vs SUS316L: Stainless Steel Comparison for Corrosion Resistance, Applications, and Cost

Stainless steel is a corrosion-resistant metal that contains at least 10.5% chromium and no more than 1.2% carbon. The chromium content forms a "passive film" through oxidation, which protects the material from rusting. Even if this passive film is damaged, it regenerates quickly, giving stainless steel its excellent resistance to corrosion.

Among stainless steels, SUS304 and SUS316 are the most widely used austenitic grades. They differ significantly in terms of corrosion resistance, workability, and cost. In this article, we’ll compare SUS304, SUS316, and SUS316L using an easy-to-understand table.

Quick Comparison: SUS304 vs SUS316

SUS304: Balanced Performance at an Affordable Price

SUS304 is the most commonly used stainless steel grade. It contains 18% chromium and 8% nickel, offering good corrosion and heat resistance, along with solid mechanical properties. Its relatively low cost and excellent machinability make it suitable for a wide range of applications.

Why Choose SUS316 for Corrosive Environments?

SUS316 is similar to SUS304 but contains an additional 2.5% molybdenum, which provides enhanced corrosion resistance. It is particularly effective in environments exposed to saltwater, chemicals, or other corrosive substances. Common uses include piping systems, chemical plants, marine structures, and medical devices.

Key Differences Between SUS304 and SUS316

• Corrosion Resistance: SUS316 outperforms SUS304 thanks to molybdenum, especially in salty or chemical-rich environments.
• Price: SUS304 is generally more affordable.
• Workability: SUS304 is easier to machine and fabricate.
• Application: SUS316 is better suited for harsh, marine, or chemical environments.

SUS316L: The Low-Carbon Stainless Steel for Precision and Welding

SUS316L is a “Low Carbon” version of SUS316. It contains less carbon, which reduces the risk of corrosion after welding or heat treatment. Thanks to its superior corrosion resistance and machinability, SUS316L is often preferred for precision components and extreme environments.

Which Stainless Steel Grade Should You Choose?

• For general machinery parts or household items → SUS304
• For environments frequently exposed to chemicals or salt → SUS316
• For severe corrosion or high-precision machining needs → SUS316L

Stainless Steel Machining Services at Creallo

Creallo offers high-precision part manufacturing using a range of stainless steel materials such as SUS304, SUS316, and SUS316L—through CNC machining, sheet metal fabrication, and 3D SLM printing.

Start your project with Creallo today and enjoy premium quality at a reasonable price.