Difference between AISI 304 and AISI 316 grades

Difference Between AISI 304 and AISI 316 Stainless Steel

When choosing railing components, cable railing systems, frameless glass system components or other stainless steel products, the most common choice is between two popular stainless steel grades – AISI 304 (EN 1.4301) and AISI 316 (EN 1.4401). The main differences are corrosion resistance, operating environment and cost.

AISI 304 (EN 1.4301)

AISI 304 is one of the most widely used stainless steel grades. It contains approximately 18–20% chromium and 8–10.5% nickel, providing good corrosion resistance under normal atmospheric conditions.

Advantages:

• More affordable price.
• Wide range of railing components and fittings.
• Excellent choice for indoor applications.
• Suitable for most outdoor projects located away from coastal areas.
• Easy to maintain and clean.

Disadvantages:

• Lower resistance to aggressive environments.
• Not recommended for coastal areas with high salt exposure.
• Not recommended for swimming pools or environments with strong chemicals.

AISI 304 is an excellent choice for residential, commercial and public projects throughout Lithuania, Latvia and Estonia where exposure conditions are moderate.

AISI 316 (EN 1.4401)

AISI 316 is an acid-resistant stainless steel grade. The main difference compared to AISI 304 is the addition of molybdenum (2–3%), which significantly improves resistance to corrosion, chlorides and aggressive environments.

Advantages:

• Excellent corrosion resistance.
• Suitable for coastal and marine environments.
• Ideal for swimming pools, SPA facilities and industrial applications.
• Resistant to moisture, salts and more aggressive chemicals.
• Long service life in demanding environments.

Disadvantages:

• Higher cost.
• Not all railing components are available in AISI 316.

AISI 316 is recommended for projects located near the sea, exposed to constant moisture or installed in aggressive industrial environments.

Which Grade Should You Choose?

For most standard indoor and outdoor projects, AISI 304 is sufficient. However, for coastal areas, swimming pools, SPA centres and industrial environments, AISI 316 is the recommended choice due to its significantly higher corrosion resistance.

Looking for high-quality stainless steel products? Explore our railing components, cable railing systems and frameless glass system categories.

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