Stainless steel is a popular material and widely used in the manufacturing process. This material comes in various grades and types. These types differ from one another in terms of their chemical composition. 18/10 and 304 stainless steel grades are often compared to each other. The comparison of 18/10 vs 304 stainless steel makes their selection very tedious.
Some people believe that 18/10 and 304 stainless steel are the same. Interestingly, both types of stainless steel have several distinct characteristics. These differences make them suitable for different needs and requirements. In this article, I’ll discuss the key differences between 18/10 and 304 stainless steel. So, let’s begin!
Overview of 18/10 and 304 Stainless Steel
304 and 18/10 stainless steel grades have many similarities. However, the fractional notation in 18/10 stainless steel indicates a unique chemical composition.
304 and 18/10 SS differ in terms of their nickel content. Both of these types consist of the same 18% chromium content. However, 304-grade stainless steel contains 8% nickel. On the other hand, 18/10 stainless steel has 10% nickel, which makes it unique. The higher nickel content in 18/10 stainless steel makes it a premium, durable, and visually appealing material.
304 stainless is a specific grade set by the American Iron and Steel Institute (AISI) system. However, the 18/10 is not a designated grade and is only a fractional notation. This 18/10 indicates stainless steel with an 18% chromium and 10% nickel composition. Both types of stainless steel differ in terms of their usability.
Remember, stainless steel is an alloy made of various elements. Those include iron, chromium, nickel, and a few more. However, the proportion of each of these elements is different in different types of stainless steel. Similarly, the 18/10 and 304 grades also differ in terms of their chemical composition. Here is a table showing their chemical composition:
| Element | 304 Stainless Steel | 18/10 Stainless Steel |
| Chromium (Cr) | 18.0 – 20.0% | 18% |
| Nickel (Ni) | 8.0% | 10% |
| Carbon (C) | ≤ 0.08% | ≤ 0.08% |
| Manganese (Mn) | ≤ 2.0% | ≤ 2.0% |
| Silicon (Si) | ≤ 1.0% | ≤ 1.0% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% |
Both of these materials have almost the same chromium content. Remember, chromium makes material corrosion-resistant by forming a chromium oxide layer. However, these two types of stainless steel differ in terms of shine and toughness. Why? Because both of these types have different proportions of nickel.
Differences Between 18/10 Stainless Steel & 304 Stainless Steel
18/10 and 304 stainless steel are the same; it is a myth, and many people believe in it. However, both of these types have different properties and use cases. The selection between 304 and 18/10 should be made depending on the properties you need. In the section below, I’ll compare 304 and 18/10 head-to-head and explain their differences.
1- Nickel & Chromium Content
As I said earlier, the 304 grade stainless steel has a chromium content of 18 to 20%. On the other hand, 18/10 stainless steel contains 18% chromium. Remember, chromium content in a material makes it corrosion-resistant. I consider both types to be equivalent in terms of corrosion resistance under moderate conditions.
However, the difference in the nickel proportion creates all the differences. The 304 grade has 8% nickel, while the 18/10 type has 10% nickel. This increased nickel content makes 18/10 stainless steel more premium. How? Nickel is responsible for raising the toughness of materials. Additionally, it also increases the shine and physical appearance of materials.
Due to increased toughness, the material becomes more durable in the long run. 304 grade stainless steel has lower toughness and strength due to its lower nickel content. Remember, lesser toughness also reduces the durability of 304-grade stainless steel. This material can be prone to corrosion despite having a higher chromium proportion.
2- Stress & Crack Resistance
18/10 stainless steel is the superior option when it comes to crack resistance. As I mentioned earlier, this type of stainless steel contains a higher proportion of nickel. This material increases the toughness and strength. When exposed to stress, nickel ensures that 18/10 does not bend, crack, or fail. On the other hand, the 304 grade also resists cracking.
However, its crack resistance is not as good as that of 18/10 stainless. The reason is that it has lower nickel (8%). So, its toughness and ability to resist bending are compromised. Due to better stress resistance, 18/10 stainless steel is used to make cookware. Those items remain in good shape for years.
3- Wear & Scratch Resistance
18/10 stainless steel is superior in terms of wear resistance. It has higher nickel, which increases its robustness and toughness. Their surface is stronger and does not get scratched easily. Therefore, this material is used to make parts that are frequently used. Their frequent washing, handling, and cleaning do not make the surface rough.
On the other hand, the 304 grade is slightly compromised in terms of wear resistance. This material has somewhat lower strength and is prone to scratching. Additionally, their dull appearance, combined with scratches, makes them look less attractive. A polished look and improved toughness make 18/10 stainless steel an ideal option for jewelry and other decorative pieces.
4- Corrosion Resistance in Harsh (Salty & Moist) Conditions
Both 304 and 18/10 stainless steel are corrosion-resistant in normal conditions. They have chromium (18%). When chromium reacts with oxygen, a layer of chromium oxide forms. This layer is very effective in protecting the material from corrosion.
However, their corrosion resistance varies when they are exposed to harsh conditions. As you are aware, these materials can be used in near-coastal areas or in salty water. Under such situations, the likelihood of material corrosion is high. In salty conditions, the chromium oxide layer can get damaged. As a result, the material’s corrosion resistance is affected.
However, the 18/10 stainless steel has higher nickel content. This nickel makes the 18/10 material scratch-resistant and strong. Additionally, it improves the toughness and strength of the chromium layer. So, these layers won’t deteriorate even in the harshest conditions. Due to this, the 18/10 stainless steel has better corrosion resistance than its counterpart.
5- Machinability & Weldability
Both of these materials are excellent in terms of weldability. The reason is that 304 and 18/10 have almost similar chemical compositions. The slightly higher nickel content in 18/10 has no impact on the welding process.
You can use a TIG, MIG, or laser welding process and create a strong weld. However, these stainless steel types differ in terms of machinability. Remember, stainless steel is cut to make various parts, such as pipes and sheets. However, the 18/10 stainless steel has higher nickel content. This nickel imparts greater strength, toughness, and hardness to the material.
As a result, the cutting tools will have to be more powerful to create cuts. On the other hand, the 304 grade has a lower nickel content and is less durable than 18/10 stainless steel. Therefore, the cutter will be able to cut, shape, and create various parts more easily. Due to ease of machinability, metal fabricators generally prefer the 304 stainless steel grade.
6- Heat & Flake Resistance
304 and 18/10 stainless steel types come with the same heat resistance. Both can withstand the temperature of around 870°C. However, these two materials differ in terms of flake resistance. When a material is heated, it undergoes scaling. It means the oxide layer present on the surface starts to peel off. Strong materials generally resist this flaking or scaling.
The 18/10 stainless steel offers better resistance against flaking. When heated, this material provides better performance. Why? Because it has a higher nickel content, which gives it stability. On the other hand, the 304 stainless grade undergoes flaking, and its oxide layer peels at higher temperatures. Additionally, the 18/10 stainless steel maintains its mirror-like shine even in harsh conditions.
7- Cost & Applications
Nickel is a premium element and one of the most expensive alloy elements. The 18-10 stainless steel has 10% nickel, while the 304 grade has 8%. Due to a 2% higher nickel content, 18/10 stainless steel falls into the premium category. Its higher price can be a significant drawback for those with a tight budget. However, I consider 18/10 material worth the cost.
This material offers excellent visual appeal (shine). Additionally, it is more rigid, tougher, stronger, and more durable, as well as resistant to flaking. This material is best suited for use in cookware and other premium kitchen products. 304 stainless steel is inexpensive and used to make routine parts that are not very costly.
Here is a table showing the application comparison of 304 and 18/10 stainless steel:
| 18/10 Stainless Steel | 304 Stainless Steel |
| Premium cookware & cutlery | Kitchen sinks & counters |
| High-end flatware sets | Food processing equipment |
| Medical & surgical tools | Architectural panels & railings |
| Luxury kitchen appliances | Industrial piping & tanks |
| Decorative finishes | General household utensils |
Frequently Asked Questions
Is 304 stainless better than 18-10?
No. I consider 18/10 stainless steel a premium and superior option over 304 grade. It offers better toughness, durability, corrosion, and flake resistance. Additionally, it has a shinier physical appearance, making it attractive for decorative purposes.
Are 18-10 and 304 stainless steel the same?
No. Both of these stainless steel types are different. 18-10 stainless steel contains 10% nickel, whereas 304 grade stainless steel contains 8% nickel. This difference in nickel proportion makes these types worlds apart.. The 18/10 stainless steel offers better value and performance over the 304 grade.
Which is better: 18-10 or 304 stainless steel?
I favor 18-10 stainless steel and consider it a better option due to its multiple properties. This material is resistant to corrosion, flaking, heat, and offers excellent mechanical strength. Additionally, its overall look and crack resistance are something that make it stand out.
Conclusion
So, which should you choose, 304 or 18/10 stainless steel? I am sure that you’ll have an answer to this question after reading this comparison guide. Want my opinion? I would recommend choosing 18-10 stainless steel. The slightly higher nickel content imparts many excellent properties to this material. Remember, the differences between these materials are minor.
However, the small distinctions matter when you are very critical in many applications. In this article, I’ve explained all the distinctions between 304 and 18-10 stainless steel. During the selection process, analyze your use case and requirements. This analysis will help you select the type of stainless steel that best suits your needs.