Have you ever encountered 904L stainless steel in your experience? Do you know or have an idea what 904L stainless steel is? Regardless of your answer, we’ll get you the information you need about SAE 904L in this article.
We’ll talk about what it is, why people choose it over other stainless steel types, what businesses and companies use it for, and more!
What is 904L Stainless Steel?
Source: Acier spécial Fushun
904L stainless steel is a high-alloy austenitic stainless steel built for environments where corrosion is a real concern.
It has higher amounts of nickel, chromium, and molybdenum, plus copper, to handle aggressive chemicals and acidic conditions usual stainless steels struggle with. This grade is easy to make, weld, and form, and it’s non-magnetic in nature.
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Does Rolex Use 904L Stainless Steel?
Source: Time & Tide Watches
Yes, they do. In fact, Rolex is a brand that takes pride in them using 904L in their watches. Dubbing it as Oystersteel, Rolex since used 904L in making their steel watches since the ‘80s because of its superb ability to withstand harsh conditions.
904L Stainless Steel Characteristics, Properties, and More
To further understand and really know 940L stainless steel, we need to look at its properties. Let’s start with its chemical composition.
Composition chimique
Durabilité et résistance
Now, let’s talk about its strength. 904L offers reliable strength for process equipment and pressure-related applications. Although its strength isn’t its main selling point, 904L is chosen more for its longevity in corrosive and chemically-active environments than for load-bearing performance.
Basically, it’s not as strong as other grades, but it does just fine in regular or typical conditions.
Densité
The density of 904L stainless steel is about 7.9 g/cm3. This density is usual for high-performing, high-alloy stainless steels. This gives it a solid feel without adding unnecessary weight to fabricated components.
REMARQUE: Density is an important and factor and a “good-to-know” because it helps people understand the logistics and performance of the material.
Résistance à la corrosion
Corrosion resistance is the standout feature of this grade. 904L performs extremely well against uniform corrosion, pitting, and stress corrosion cracking, especially in acidic and chloride-rich environments. It clearly outperforms other grades in its like, such as 316L in these conditions.
Résistance à la température
904L handles moderate heat well and maintains good oxidation resistance. However, long-term use and exposure at very high temperatures (typically above 400°C) is not its purposeful or intended use. There are other grades good at that, but not 904L.
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Soudabilité et usinabilité
When people choose steel grades, two of the most important things to factor in would be their machinability and weldability. 904L stainless steel welds well using standard welding methods and, in most cases, does not need preheating or post-weld heat treatment.
On the other hand, machining is more demanding because 904L work-hardens quickly due to its high nickel content. However, with sharp tools, steady feeds, and proper cooling, you can be sure that you’ll be able to machine them for custom parts and precision components without major issues.
Coût
Last but most definitely not least is the cost. Understanding the cost is as important as knowing all the other factors, in itself because you’ll be buying this in bulk and a small difference compounds.
904L stainless steel is slightly more expensive than common grades like 304 or 316. Why? It’s due to its alloy content and overall functionality. That higher cost is often justified in applications where corrosion failure would be far more expensive.
Applications of 904L Stainless Steel: Where Can You Use Them?
Source: Stainless Sheets
We know that one of the most common applications of 904L stainless steel is in the watches industry, but what else are they used for?
You’ll mostly see 904L stainless steel used in several environments including, but not limited to:
- Heat exchanger tubes
- Chemical processing pipes
- Condenser tubes
- Pump housings
- Valve bodies
- Process tanks
- Storage vessels
- Et beaucoup plus!
904L stainless steel is so special that many businesses find it to be a staple in their parts and components. Take note, though, that these aren’t the only uses or applications of 904L stainless steel! There are others!
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904L vs. 316L: Which is Better?
These two grades are often the most commonly compared grades because of their similarities, especially in terms of their use in watches. While they’re similar, they’re not identical. There are certain aspects where 904L performs better than 316L, and vice versa.
To help you understand it more and better, here’s a table that differentiates them:
| Propriété | Acier inoxydable 316L | Acier inoxydable 904L |
| Résistance et durabilité | Strong and reliable for general use | Built for long-term exposure in harsh environments |
| Résistance à la corrosion | Very good in most marine and chemical settings | Excellent in highly acidic and aggressive conditions |
| Seawater Performance | Performs well in flowing seawater | Better suited for stagnant or high-chloride seawater |
| Stress Corrosion Cracking | Modéré | Haute |
| Performance in Acidic Environments | Limited in strong acids | Designed for sulfuric and phosphoric acids |
| Soudabilité | Easy to weld with standard methods | Also easy to weld, with strong weld stability |
| Long-Term Stability | Good under moderate conditions | Better for prolonged exposure and tough service |
Considérations relatives aux coûts
Of course, let’s not take cost out in choosing. How much the grade is, is often where the decision starts to shift. 316L is widely available and more affordable, which makes it a practical option for many applications. 904L costs more due to its higher alloy content, especially nickel and molybdenum.
So, the decision actually comes down to the use or where (the environment) you’re going to be using it. Go for 316L for typical usage and application, but 904L if you’re going for heavier and much more chemically-inclined use.
Why the Best 904L Stainless Steels Are From HDC Manufacturing
As one of China’s most trusted names in the manufacturing space, you can definitely count on us if you ever need 904L stainless steel. We’ve mastered everything from sourcing raw materials, designing industry-specific products and prototypes, to manufacturing them.
That basically means that the quality of the 904L stainless steel we can get you will remain unmatched! Besides our expertise in supplying 904L and other types of stainless steel to our clientele, we also do machining services like Usinage CNC, tournant, moulage de métal, et beaucoup plus!
Contact us today and get a free quote!
