What is the difference between 304 and 316 stainless steel mesh?

The main difference between 304 and 316 stainless steel mesh lies in their composition and corrosion resistance, making each more suitable for specific applications depending on the environmental conditions.

1. Composition

304 Stainless Steel: This is the most commonly used stainless steel alloy, often referred to as "18/8" because it contains approximately 18% chromium and 8% nickel. This composition gives 304 stainless steel its good balance of strength, corrosion resistance, and formability.

316 Stainless Steel: In addition to the same amounts of chromium (16-18%) and nickel (10-14%) found in 304 stainless steel, 316 contains 2-3% molybdenum. Molybdenum enhances the material's resistance to chloride-induced corrosion, which makes 316 more resistant to pitting and crevice corrosion, especially in salty or acidic environments.

2. Corrosion Resistance

304 Stainless Steel: It has excellent resistance to oxidation and corrosion in a wide range of atmospheric and mildly corrosive environments. However, it is not as resistant to more aggressive chemicals, especially chlorides (like saltwater).

316 Stainless Steel: This alloy has superior resistance to corrosion, particularly in environments that contain chlorides (such as seawater or de-icing salts), acids, and high-saline conditions. The addition of molybdenum significantly improves its resistance to pitting, crevice corrosion, and rusting in marine environments, making it ideal for harsh chemical or marine environments.

3. Strength and Durability

Both 304 and 316 stainless steel have similar mechanical properties in terms of strength, making them durable and able to withstand high pressures and temperatures. The addition of molybdenum in 316 can improve its overall long-term durability in challenging environments.

4. Cost

304 Stainless Steel is less expensive than 316, as it doesn't contain molybdenum. The cost difference can be significant, especially for larger quantities of mesh, so 304 is often chosen when the material will not be exposed to harsh conditions.

5. Applications

304 Stainless Steel Mesh is typically used in applications where exposure to extreme environmental conditions is minimal or where there is low risk of corrosion from chemicals or salts. Examples include:

Food processing (as long as salt is not involved)

Filtration in non-corrosive environments

Industrial mesh for general-purpose use

Decorative applications

316 Stainless Steel Mesh is the better choice for harsh environments, particularly those exposed to salt or acidic conditions. Common uses include:

Marine applications (boat parts, coastal structures)

Chemical processing

Medical and pharmaceutical environments

Outdoor applications (e.g., architecture in coastal regions, or when exposed to acids, chlorides, or other corrosive agents)

Summary Table

Choose 304 stainless steel mesh if your application is indoors, or in environments where exposure to corrosive elements is limited.

Choose 316 stainless steel mesh for applications exposed to aggressive chemicals, saltwater, or harsh outdoor conditions.