304 vs 316 Stainless Steel: What's the Real Difference & How to Choose?

Grades 304 and 316 are the two most widely used types of stainless steel across all industries. While they may look identical, their underlying properties are significantly different, especially regarding corrosion resistance. Choosing the wrong grade can lead to a shorter lifespan and higher maintenance costs. This article breaks down the key differences to help you make the right choice.

The Secret Ingredient: "Molybdenum"

The single most important difference between SS304 and SS316 is that Grade 316 contains 2-3% Molybdenum, whereas Grade 304 does not.

This addition of molybdenum acts as a "special shield," dramatically increasing the material's resistance to corrosion from chlorides. Chlorides are commonly found in:

• Salt and seawater
• Chlorine-based cleaning agents
• Human sweat

Comparison Chart: SS304 vs SS316

A Simple Rule of Thumb: "If It Involves Salt, Go with 316"

If you're unsure, use this principle as a starting point: If your project will be exposed to salt, seawater, chlorine, or other harsh corrosive agents, the extra investment in Grade 316 is a wise long-term decision. However, for interior applications or general use away from these elements, Grade 304 is an excellent and cost-effective choice.