When selecting stainless steel for your project, it’s essential to understand the differences between available grades. Two of the most widely used are 304 stainless steel and 430 stainless steel. While both offer durability and corrosion resistance, they are engineered for different applications and environments. Choosing the right one can impact performance, longevity, and cost.

At Mill Steel Company, we stock and supply a wide range of stainless steel products, including 304 and 430 grades, to meet the needs of industries ranging from construction to automotive. Let’s break down the key differences between these two grades.

What is 304 Stainless Steel?

304 stainless steel is an austenitic grade, meaning it has a high level of chromium (18–20%) and nickel (8–10.5%). This composition gives it excellent corrosion resistance, durability, and formability.

Key Properties of 304 Stainless Steel:

Corrosion Resistance: Performs exceptionally well in a variety of environments, including exposure to chemicals and outdoor conditions.
Strength & Durability: High tensile strength makes it a reliable choice for demanding applications.
Non-Magnetic: Typically, non-magnetic in the annealed condition.
Applications: Widely used in architectural projects, food processing equipment, chemical containers, and piping systems.

Learn more about 304 stainless steel in our dedicated article.

What is 430 Stainless Steel?

430 stainless steel is a ferritic grade, composed mainly of chromium (16–18%) and very little to no nickel. This makes it a more cost-effective option while still offering good corrosion resistance in many environments.

Key Properties of 430 Stainless Steel:

Moderate Corrosion Resistance: Performs well in mildly corrosive environments but is not as resistant as 304.
Magnetic: Naturally magnetic due to its ferritic structure.
Formability: Good ductility and formability but less than 304.
Applications: Commonly used in automotive trim, appliances, roofing, and decorative applications where cost efficiency is important.

For technical specifications, you can explore resources like the Nickel Institute for detailed metallurgical data.

Side-by-Side Comparison: 304 vs. 430 Stainless Steel

Which Grade Should You Choose?

Choose 304 stainless steel if you need superior corrosion resistance, especially in outdoor, chemical, or food-grade environments.
Choose 430 stainless steel if cost is a priority and the application doesn’t require high corrosion resistance, such as interior trim or appliance panels.

Both grades offer unique advantages, and the right choice depends on your project’s performance and budget requirements.

Partner with Mill Steel Company

At Mill Steel, we’re more than just a supplier—we’re your partner in selecting the right material for your job. With our extensive inventory of stainless steel sheet and coil, combined with expert processing capabilities, we deliver the quality and precision your business depends on.

Ready to source stainless steel for your next project? Contact us today to discuss your needs.

304 vs. 430 Stainless Steel: Key Differences Explained