Stainless steel 316L vs 904L is widely used in the industrial sector due to its cost-effectiveness and general properties such as corrosion resistance. Specifically, 904L is best suited for use in harsh environments due to its acid resistance. Whereas 316L is used in chlorine environments. In this article, you will be helped to choose the right material between 316L and 904L by understanding the differences between 316L and 904L composition, properties, and applications.
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316L is a versatile industry workhorse, while 904L is a high-performance specialist. So how do you know when to stick with your trusted 316L and when you must upgrade to the higher-quality 904L?
This guide will provide a comprehensive comparison to help you make an informed decision.
316L, also known as austenitic stainless steel, has high corrosion resistance in chlorine environments. 316 is biocompatible and can be cleaned and sterilized. 316L also has efficient heat transfer properties and is durable, which is why it is used in a wide range of applications listed below.
904 L is also used in cooling systems and heat exchangers in Marin due to its good corrosion resistance in harsh environments, especially acidic environments. All these characteristics make 904 L suitable for the applications listed below.
The performance of any alloy begins with its chemistry. The significant price and performance difference between 904L and 316L comes down to the higher concentration of valuable alloying elements in 904L.
The chemical composition of AISI 316 L and AISI 904L is as follows:
Element
AISI 316L Stainless Steel (%)
AISI 904L Stainless Steel (%)
Fe
BalanceBalanceCr
16.0 – 18.019.0 – 23.0Ni
10.0 – 14.023.0 – 28.0Mo
2.0 – 3.04.0 – 5.0Cu
–1.0 – 2.0C
≤0.03≤0.02Mn
≤2.00≤2.00Si
≤1.00≤1.00P
≤0.045≤0.045S
≤0.03≤0.035N
≤0.10≤0.10The table below gives a numerical comparison of 316L and 904L stainless steel.
316L Stainless Steel
904L Stainless Steel
Density
7.99 g/cm38.00 g/cm3Melting point
-°C（-°F）-°C（-°F）Magnetic
Non-magnetic in the annealed stateNon-magneticThermal Conductivity
16.0 W/m·K（100℃）12.6 W/m·K（100℃）Thermal Expansion Coefficient
16.0 μm/m·K (0-100 degrees Celsius)15.0 μm/m·K (0-100 degrees Celsius)Resistivity
0.074×10^-6Ω·m0.085×10^-6Ω·mSpecific Heat
500 J/kg·K450 J/kg·KWhile both ISO 316L and ISO 904L perform well in corrosive environments, 904L is highly resistant to corrosion in high chloride environments. 316L is highly recommended for corrosion-resistant applications, but only for general use. 904L is used in specific severe conditions such as heat exchangers. 904L is more susceptible to stress corrosion cracking when tensile loads are applied in severe environments than 316L.
This is where 904L truly justifies its “super austenitic” title and its higher cost.
General Corrosion & Acids
While 316L handles mild corrosives well, it can struggle with strong acids like sulfuric and phosphoric acid. The combination of high Molybdenum and added Copper in 904L gives it outstanding resistance to these chemicals, even at higher concentrations and temperatures. This makes it a go-to material for chemical processing plants.
Pitting and Crevice Corrosion
In environments rich with chlorides (e.g., seawater, coastal areas, desalination plants), stainless steel is vulnerable to localized pitting and crevice corrosion. The resistance to this is often measured by a PREN (Pitting Resistance Equivalent Number).
316L PREN: ~24-26
904L PREN: ~34-37
The significantly higher PREN score of 904L indicates a far superior ability to resist pitting corrosion, ensuring longer equipment life in chloride-rich media.
Stress Corrosion Cracking (SCC)
SCC is a form of catastrophic failure that can occur when a material is under tensile stress in a corrosive environment. Standard austenitic grades like 316L are susceptible to chloride-induced SCC.
Thanks to its extremely high nickel content, 904L offers excellent resistance to SCC. This is a critical safety and reliability factor in applications like heat exchangers and pressure vessels.
The mechanical properties of a stainless steel grade determine its suitability for application under specific conditions. The mechanical properties of stainless steel grades ISO 316L and ISO 904L are described below:
The Brinell, Vickers, and Rockwell hardnesses of stainless steel grades ISO 316L and ISO 904L are shown in the table below.
316L Stainless Steel
904L Stainless Steel
Brinell hardness146 – – 220Vickers hardness152 – – 230Rockwell hardnessB79-B95B85-B96The strength of 316L and 904L is shown in the following table:
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316L Stainless Steel
904L Stainless Steel
Tensile Strength
485-620MPa490-690MPaYield Strength
170-310MPa220-450MPaElastic Modulus
193 gallons200 gallonsAmong the stainless steel grades ISO 316L and ISO 904L, 904L is ductile and easy to weld and machine compared to 316L. 316L contains alloying elements compared to 904L, which makes it difficult to weld and machine.
316L and 904L stainless steel surfaces are subjected to surface treatments such as polishing, electropolishing, and passivation. 316L has a better surface finish compared to 904L.
Both stainless steel grades ISO 316L and ISO 904L can be annealed to eliminate internal stresses and improve ductility. 316L can be annealed at – °C, while 904L can be annealed at – °C.
904L is significantly more expensive than 316L stainless steel. This is directly due to its high nickel and molybdenum content, two expensive metals.
However, decisions should not be based solely on initial cost. The total lifecycle cost should be considered:
If 316L is sufficient, then using 904L is an unnecessary expense.
But if 316L fails prematurely in a harsh environment, the cost of downtime, replacement, and potential damage will far outweigh the initial savings.
Investing in 904L in the right application from the start is a strategic decision that will pay off handsomely in reliability and longevity.
Steel is an important material in our daily lives, used in a variety of applications from construction to transportation. When it comes to choosing the right type of steel for your application, two popular options are stainless steel and carbon steel. While both are strong and durable, they have unique properties that make them better suited for certain applications.
In this article, we will provide a detailed study and comparison between stainless steel and carbon steel, will also explain why you should choose jay steel corporation for your stainless steel or Carbon steel product needs!
What is Stainless Steel?
Steel is a composite of carbon and iron. Stainless steel is composed of a minimum of 10.5% chromium, less than 1.2% carbon, and other elements used in alloying. The mechanical properties and corrosion resistance of stainless steel can be improved further through the addition of other elements, including nickel, titanium, molybdenum, manganese, and niobium, among others. When iron is exposed to oxygen, it oxidizes and rusts, but chromium can be exposed to oxygen without undergoing this process. Thus, a protective layer of chromium is applied to stainless steel to create a barrier between environmental oxygen and the metal’s iron content, making it resistant to corrosion or rust.
Types of Stainless Steel
Stainless steel’s various properties are determined by the level of chromium present, with lower levels generally resulting in less durable but more affordable steel. There are different categories of stainless steel, such as:
Pros of Stainless Steel:
Cons of Stainless Steel:
What is Carbon Steel?
Carbon steel, on the other hand, contains significantly less chromium than stainless steel and is mainly composed of carbon and iron with only a few other elements included, if any at all. This gives rise to its reputation as a ‘low-alloy’ steel. While both stainless and carbon steel share this fundamental composition, carbon steel is typically defined by its carbon concentration, which generally hovers around 2-2.5%, although this can vary. Carbon steel is subject to rust unlike stainless steel, but is often less expensive and boasts a wide range of mechanical properties dependent on its carbon content.
Low-carbon steels tend to be less robust and pliable, but can be easily machined and welded, whereas high-carbon steel is stronger, but significantly more difficult to manipulate.
Types of Carbon Steel
Carbon steel alloys are categorized based on their carbon content, with low-carbon steel being the most commonly used form.
Pros of Carbon Steel
Cons of Carbon Steel:
Comparison between Stainless Steel and Carbon Steel
Stainless steel and carbon steel are two commonly used materials in manufacturing and construction. While they may look similar, they have different properties and applications. Here’s a comparison between stainless steel and carbon steel:
Carbon steel on the other hand is used in applications that require strength and durability, their industrial uses are been cauterized on the basis of their different types such as
Mild Carbon Steel
Medium Carbon Steel
High Carbon Steel
Stainless steel and carbon steel have different properties and applications. Stainless steel offers several advantages over carbon steel, including corrosion resistance, durability, and hygiene.
Manufacturing of Stainless Steel & Carbon Steel Products
Stainless steel & Carbon Steel products are manufactured using different processes, such as hot rolling, cold rolling, and forging. Jay Steel Corporation produces a wide range of stainless steel & Carbon Steel Products as such as in different forms and grades like;
Stainless Steel & Carbon Steel Wire Mesh
Stainless Steel & Carbon Steel Round Bar
Stainless Steel & Carbon Steel Strips, Sheets & Plates
Stainless Steel & Carbon Steel Pipe & Tubes
Stainless Steel & Carbon Steel Fittings
Stainless Steel & Carbon Steel Flanges
Stainless Steel & Carbon Steel Welding Rod
Stainless Steel & Carbon Steel Fasteners
Why Choose Jay Steel Corporation as your Stainless Steel & Carbon Steel Product Suppliers?
Choosing the right stainless steel product supplier is essential to ensure that you get the best products for your specific needs. Here are some reasons why Jay Steel Corporation is the perfect choice for all your stainless steel product needs:
Jay Steel Corporation is the leading stainless steel manufacturer and carbon steel manufacturer in India, offering a wide range of high-quality products, customization options, competitive pricing, expertise and experience, global reach, timely delivery, and excellent customer service. Choose Jay Steel Corporation as your stainless steel product supplier and experience the best products and services in the industry.
Final Words!
The company is the world’s best Knitted Wire Mesh supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.