Stainless steel is one of the world's leading metals in various applications. It provides exceptional corrosion resistance, durability, and aesthetic appeal. While the name suggests that it is impervious to everything, stainless steel is still susceptible to problems metals face, like rust and corrosion. The critical difference is its longevity to withstand elements without showing signs. Among the multitude of grades available, 304 and 316 stainless steel stand out as the two most common. Both 304 and 316 stainless steel are often called marine grade or surgical stainless steel.
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Stainless steel is an alloy comprised of iron, chromium, nickel, and other elements. The addition of chromium is vital to making stainless steel. It forms a protective oxide layer on the surface of the steel, preventing corrosion and enhancing its resistance to various environmental factors. The chromium layer can regenerate when damaged and does so quicker when more chromium is present. The rust and corrosion rate is incredibly low due to this protective layer.
Due to the robust properties of stainless steel, its versatility extends to most industries including petrochemical, process equipment, and turbine engine. Stainless steel is available in multiple alloys, but the two most common are 304 and 316 stainless steel. These both are classified as austenitic stainless steels.
For a further breakdown of stainless steel in general, check out What Makes It Stainless.
The 304 stainless steel alloy is the most widely used and versatile grade in the stainless-steel family. It comprises roughly 18% chromium and 8% nickel. Notably, it doesn't contain any molybdenum. 304 stainless steel is highly resistant to atmospheric corrosion, water, and many chemicals. Along with its ease of fabrication, 304 stainless steel is a popular choice for metal castings for applications such as pump & valve components, food processing equipment, bearings, heat exchangers, and pressure vessels.
316 stainless steel takes corrosion resistance to the next level. It has an alloy composition of roughly 18% chromium, 9% nickel, and 2-3% molybdenum. The molybdenum helps increase strength and hardness, especially at higher temperatures. The more significant upside to alloying molybdenum into steel is that it boosts corrosion resistance to chloride. This makes it a top choice for applications in marine settings, chemical processing, and pharmaceutical manufacturing.
In the world of stainless steel, the choice between 304 and 316 depends on the application's specific requirements. While 304 offers excellent corrosion resistance and versatility at a more affordable price point, 316 stainless steel is a better choice for applications demanding superior corrosion resistance, especially in harsh environments.
Our team at MetalTek can help guide your choice in selecting the suitable alloy for your project. Picking the correct alloy can save you money and enhance durability. Start your metal project journey today by connecting with our team of experts.
While the two most popular grades of stainless steel might seem identical at a glance, they hold important differences that can lead to substantial savings over the life of your product depending on your intended uses.
All stainless steels contain a mix of iron and chromium at various levels. But the exact mix'and other additions ' are what create the differences between grades.
The most popular 304 grade stainless contains 18% chromium and 8% nickel ' though other alloys exist within the same grade.
Stainless steels of the 316 grade include less chromium ' often around 16% ' but increase nickel levels and add molybdenum to the mix.
In most common alloys, you'll find 10% nickel and 2 to 3% molybdenum. However, specialty alloys might have as much as 9% molybdenum.
Most stainless steel ordered around the world is Grade 304.
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It offers the standard corrosion resistance, formability, strength, and easy maintenance for which stainless is known.
While 316 comes in second in terms of quantities sold, it offers vastly superior corrosion resistance to chlorides and acids.
This makes it popular for a wide range of environments'including:
These increased resistances also help to take the guesswork out of cleaning and allow you to clean your stainless more often using stronger cleansers and detergents with little worry of damage or altering the appearance of the stainless steel.
This makes 316 an ideal upgrade for environments with strict hygiene and cleanliness standards.
With the benefits offered by 316 stainless steel, you might wonder why 304 remains the most popular'
If you're not sure which to choose, consider these common uses for the two grades:
In short, it's mostly about cost and corrosion resistance requirements.
If you don't need the added resistance of 316, standard 304 grades will offer similar performance and longevity at a lower price point.
However, in situations where the added resistance is needed, 316 often improves the functional lifespan of the steel products by years.
This can lead to drastic long-term savings despite the initial increase in investment.
Looking for more information on the various traits and performance considerations surrounding other stainless steel grades?
By matching the grade of stainless to your intended usage and environment, you can optimize both the financial and physical benefits of your stainless steel investment.
If you're not sure where to start or are looking for a trusted partner with a wide selection of stainless options, the experts at Unified Alloys have more than 40 years of experience supplying industries across North America. Call today for a consultation!
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