Choosing the right stainless steel for your product isn’t just about looks.
It’s about strength, corrosion resistance, and long-term reliability—especially for parts exposed to moisture, heat, or wear.
What Do the Numbers 18/8, 18/10, and 18/0 Really Mean?
These numbers refer to the composition of stainless steel:
-
The first number (18) stands for 18% chromium
-
The second number (8, 10, or 0) refers to the percentage of nickel
So, for example:
-
18/8 = 18% chromium and 8% nickel
-
18/10 = 18% chromium and 10% nickel
-
18/0 = 18% chromium and 0% nickel
All three grades are corrosion-resistant, but the nickel content significantly affects durability, finish, and even magnetic properties.
Why Does Nickel Content Matter?
Nickel helps steel resist corrosion and gives it a smoother, shinier surface.
It also makes the material more flexible and less likely to crack under stress.
Here’s how they compare:
-
18/10: High corrosion resistance, non-magnetic, bright finish
-
18/8: Good balance of cost and resistance
-
18/0: Lower corrosion resistance, magnetic, more affordable
If your part will face water, acids, or regular cleaning (such as in kitchens or outdoors), a higher nickel grade is the better choice.
How Do These Grades Affect Manufacturing and CNC Machining?
In machining or forming, different grades behave differently.
-
18/10 and 18/8: More ductile and easier to form or deep draw
-
18/0: Harder and more brittle, but holds shape well in stamping
18/10 and 18/8 are both non-magnetic and excellent for welding, polishing, and shaping.
18/0 is magnetic and better suited for dry environments where cost is a priority and appearance is less critical.
Which Grade Is Best for Your Project?
Not all parts need top-level corrosion resistance.
Here’s how to decide:
-
Use 18/10 when your product needs to resist rust, especially in humid or food-contact environments
-
Use 18/8 when you need solid corrosion resistance with better pricing
-
Use 18/0 for dry indoor use or cost-sensitive projects—especially if magnetism is required
Examples:
-
18/10: Premium kitchen tools, marine parts, medical components
-
18/8: Industrial fasteners, hardware, structural elements
-
18/0: Budget cutlery, appliances, general-purpose frames
Can 18/0 Still Be Called Stainless Steel?
Yes—18/0 still qualifies as stainless steel because it contains at least 10.5% chromium.
The 18% chromium helps protect the surface from oxidation, even without nickel.
But be cautious:
-
It won’t perform as well in wet or acidic environments
-
It may show discoloration or rust over time
-
It’s better suited to dry, indoor applications
For applications that require magnetic properties—such as induction cooktops—18/0 may actually be preferred.
Conclusion
Understanding the difference between 18/8, 18/10, and 18/0 stainless steels is essential when selecting materials for custom parts.
Each grade has its own strengths, depending on your cost target, corrosion risk, and mechanical needs. Choose wisely to match your end-use environment.