Skip to content 
Stainless steel comes in many types. You need to know which one to use to save time and cost. The austenitic vs ferritic stainless steel comparison shows how each type behaves.
In this guide, we discuss the general use and differences between austenitic and ferritic stainless steel. Once you go through them, you will be able to pick the right material for your project quite easily.
What Is Austenitic Stainless Steel?
Austenitic stainless steel is a type of stainless steel that contains about 18% chromium and 8% nickel. This combination makes it flexible and highly resistant to rust, which is perfect for wet or chemical environments.
Common Austenitic Grades
There are many common austenitic stainless steel grades:
- 304 Austenitic Stainless Steel: the most widely used grade, found in kitchen equipment, sinks, and food processing
- 316 Austenitic Stainless Steel: higher corrosion resistance, used in marine equipment and medical tools
- 321 Austenitic Stainless Steel: heat-resistant, used in furnace parts and high-temperature applications
- 310 Austenitic Stainless Steel: excellent for very high temperatures, used in heat exchangers and industrial furnaces
Main Characteristics of Austenitic Stainless Steel
Austenitic stainless steel is valued for its softness and ease of use:
- Resists rust and corrosion very well
- Non-magnetic in most conditions
- Easy to bend, shape, and weld
- Performs well in both low and high temperatures
These qualities make the austenitic vs ferritic stainless steel comparison show that austenitic steel is the better choice for environments where clean surfaces are important.
What Is Ferritic Stainless Steel?
Ferritic stainless steel is a type of stainless steel that contains about 12-25% chromium and very little or no nickel. It is hard, strong, and magnetic, but less resistant to rust than austenitic steel.
Common Ferritic Grades
Some of the most commonly used ferritic stainless steel grades are:
- 409 Ferritic Stainless Steel: used in automotive exhaust systems and mufflers
- 430 Ferritic Stainless Steel: used in kitchen appliances, decorative panels, and sinks
- 446 Ferritic Stainless Steel: highly resistant to heat and corrosion, used in furnace parts and industrial equipment
- 434 Ferritic Stainless Steel: strong and wear-resistant, used in tools and machinery components
Main Characteristics of Ferritic Stainless Steel
The ferritic stainless steel properties mostly reveal its hardness and strength.
- Magnetic in most conditions
- Good resistance to stress and wear
- Harder and less flexible than austenitic steel
- Performs well in moderate temperature applications
These characteristics make the austenitic stainless steel vs ferritic comparison pretty clear, as you can see that ferritic is better for applications requiring hardness and magnetism.
Austenitic vs Ferritic Stainless Steel: Key Differences
The ferritic vs austenitic stainless steel comparison shows how these two types differ in structure, corrosion resistance, magnetism, and strength. These differences will help you pick the right steel for the right application.
Crystal Structure
Austenitic stainless steel has a face-centered cubic (FCC) structure, which makes it soft and flexible.
Ferritic stainless steel has a body-centered cubic (BCC) structure, which gives it higher hardness and makes it magnetic.
Chemical Composition
Austenitic steel contains higher nickel (18%) and chromium (8%), while ferritic steel has lower nickel and 12–25% chromium. This makes austenitic steels easier to shape and ferritic steels stronger.
Corrosion Resistance
In austenitic vs ferritic corrosion resistance, austenitic stainless steel performs much better in wet or chemical environments. Ferritic steel resists rust in dry conditions but is less durable in moist or corrosive settings.
Magnetic Properties
Austenitic stainless steel is mostly non-magnetic, even after welding. Ferritic stainless steel is magnetic in most conditions, which can be important for certain tools or appliances.
Strength and Ductility
Austenitic steel is softer and more ductile, allowing easy bending and forming. Ferritic steel is harder and less flexible, which makes it better for parts that need strength and wear resistance.
Weldability
Austenitic stainless steel is easier to weld and form without cracking. Ferritic stainless steel is more prone to cracking during welding due to its structure.
Thermal Expansion
Austenitic steel expands more when heated, while ferritic steel has lower thermal expansion. This can affect how each type is used in high-temperature applications.
Cost Difference
Austenitic stainless steel is more expensive due to its nickel content and superior corrosion resistance. Ferritic stainless steel is more economical and is used where cost and hardness are more important than corrosion resistance.
Feature | Austenitic Stainless Steel | Ferritic Stainless Steel |
Crystal Structure | Face-centered cubic (FCC), soft and flexible | Body-centered cubic (BCC), hard and magnetic |
Chemical Composition | High chromium (18%) and nickel (8%) | Chromium 15-25%, very little or no nickel |
Corrosion Resistance | Excellent, resists rust in wet and chemical environments | Moderate, best in dry conditions |
Magnetic Properties | Mostly non-magnetic | Magnetic in most conditions |
Strength & Ductility | Softer, more ductile, easy to shape | Harder, less flexible, strong under pressure |
Weldability | Easy to weld and form | Harder to weld, may crack |
Thermal Expansion | Higher expansion when heated | Lower expansion when heated |
Cost | More expensive due to nickel and corrosion resistance | More economical, lower cost |
When to Choose Austenitic Stainless Steel
Austenitic stainless steel is a better option when you need something that won’t rust easily. It works well in wet or humid places and handles chemicals without damage. It is also easy to bend, shape, or weld, making it a great choice for kitchen tools, medical equipment, and food processing machines.
When to Choose Ferritic Stainless Steel
From austenitic vs ferritic stainless steel, ferritic stainless steel is a good pick when strength and hardness are the top priority. It is magnetic and works well in dry conditions, such as car parts and industrial machines.
Typical Applications of Austenitic and Ferritic Stainless Steel
The austenitic vs ferritic stainless steel comparison of the applications can make it clearer exactly where each type works better.
Food Processing
Austenitic stainless steel is used in sinks, storage tanks, and food machinery because it resists rust and is easy to clean. Ferritic steel is used for support parts and trays in dry areas.
Architectural Panels
Austenitic steel is a better option for exterior panels that face moisture and weather. Ferritic steel works well for interior panels and decorative elements.
Appliances
Austenitic stainless steel is used in kitchen surfaces, cookware, and sinks. Ferritic steel is used in appliance backs and machine interiors where strength is much more important.
Automotive Exhaust Systems
Ferritic steel is preferred for exhaust pipes, mufflers, and brackets due to heat resistance and strength. Austenitic steel is used in parts that may contact moisture or chemicals.
These applications clearly show how austenitic vs ferritic stainless steel fits different applications depending on corrosion resistance and magnetism.
How to Choose the Right Stainless Steel Family
The correct stainless steel you need will depend on where and how it will be used. The austenitic vs ferritic stainless steel comparison makes it easier to decide.
- If rust resistance and flexibility matter, choose austenitic steel
- If strength, hardness, and magnetism are more important, choose ferritic steel
- For wet or chemical environments, austenitic is better
- For dry or high-strength applications, ferritic works well
- Consider cost: ferritic is usually more economical
You can quickly make your decision of picking the right stainless steel family for your project after going through these facts.
Frequently Asked Questions
Is ferritic stainless steel magnetic?
Yes, ferritic stainless steel is magnetic in most conditions.
Why is austenitic stainless steel more corrosion-resistant?
It has higher chromium and nickel, which help protect it from rust and chemicals.
Which one is better for welding?
Austenitic stainless steel is easier to weld and shape without cracking.
Which one is more affordable?
Ferritic stainless steel is usually more affordable because it has little or no nickel.
Need Help Selecting the Right Stainless Steel Grade?
Finding the right stainless steel can be a bit tricky. Once you go through the austenitic vs ferritic stainless steel comparison, it will give you a clear idea. The final choice depends on your exact use.
Jianglin Steel offers a wide range of stainless steel grades to match different needs. Contact us to help choose a grade that fits your application.
