Products
Contact Us
Duplex Stainless Steel Plate
Keywords:
Category:
Product Details
Duplex Stainless Steel Plate: Duplex 2205 vs 2507 Strength, Corrosion Resistance & Cost Comparison
Duplex stainless steel plates are engineered for applications where conventional austenitic stainless steels cannot provide enough strength or corrosion resistance. Combining approximately equal proportions of austenitic and ferritic microstructures, duplex stainless steel delivers a unique balance of mechanical strength, chloride resistance, and cost efficiency.
Among duplex stainless steel grades, Duplex 2205 and Super Duplex 2507 are the two most widely used materials. While both provide excellent corrosion resistance, their alloy composition, mechanical properties, application range, and cost are significantly different.
What Is Duplex Stainless Steel Plate?
Duplex stainless steel plate is a corrosion-resistant alloy containing a mixed microstructure of approximately 50% ferrite and 50% austenite. This structure provides higher strength than traditional 300 series stainless steels while maintaining excellent corrosion resistance.
| Feature | Duplex Stainless Steel |
|---|---|
| Structure | Austenitic + Ferritic dual phase |
| Main Alloy Elements | Chromium, Nickel, Molybdenum, Nitrogen |
| Strength | Higher than 304/316 stainless steel |
| Corrosion Resistance | Excellent chloride and stress corrosion resistance |
| Typical Applications | Marine, chemical, oil & gas, energy industries |
Duplex 2205 vs 2507 Chemical Composition
The biggest difference between Duplex 2205 and Super Duplex 2507 comes from alloy content. Higher chromium, molybdenum, and nitrogen levels give 2507 superior corrosion resistance.
| Element | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Chromium (Cr) | Approx. 22% | Approx. 25% |
| Nickel (Ni) | Approx. 5% | Approx. 7% |
| Molybdenum (Mo) | Approx. 3% | Approx. 4% |
| Nitrogen (N) | Approx. 0.15% | Approx. 0.3% |
Strength Comparison: 2205 vs 2507
One of the biggest advantages of duplex stainless steel plates is their high mechanical strength. Both grades outperform 304 and 316 stainless steel.
| Property | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Tensile Strength | Approx. 620 MPa minimum | Approx. 795 MPa minimum |
| Yield Strength | Approx. 450 MPa minimum | Approx. 550 MPa minimum |
| Hardness | Higher than 316L | Higher than 2205 |
| Weight Reduction Potential | High | Very High |
Because of its higher yield strength, Super Duplex 2507 can often achieve the same structural performance with a thinner plate thickness compared with conventional stainless steel.
Corrosion Resistance Comparison
Corrosion resistance is where the difference between Duplex 2205 and 2507 becomes most noticeable.
| Corrosion Type | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| General Corrosion | Excellent | Superior |
| Chloride Pitting | Very Good | Excellent |
| Stress Corrosion Cracking | Excellent | Excellent |
| Seawater Resistance | Suitable | Designed for severe marine environments |
| Chemical Processing | Common choice | Extreme corrosion applications |
PREN Value: Measuring Pitting Resistance
The Pitting Resistance Equivalent Number (PREN) is commonly used to compare stainless steel corrosion resistance.
PREN = %Cr + 3.3 × %Mo + 16 × %N
| Grade | Approximate PREN Value |
|---|---|
| 316L | Approx. 24-26 |
| Duplex 2205 | Approx. 34-36 |
| Super Duplex 2507 | Approx. 40+ |
Cost Comparison: Is 2507 Worth the Higher Price?
Super Duplex 2507 usually costs more than Duplex 2205 because of higher alloy content, especially chromium, molybdenum, and nitrogen additions.
| Factor | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Material Cost | Lower | Higher |
| Fabrication Difficulty | Moderate | Higher |
| Service Life | Long | Extended in extreme environments |
| Total Project Value | Excellent cost-performance balance | Best for critical applications |
Typical Applications of Duplex Stainless Steel Plates
- Offshore oil and gas platforms.
- Seawater desalination equipment.
- Chemical processing vessels.
- Heat exchangers.
- Pressure vessels.
- Pulp and paper industry equipment.
- Marine engineering structures.
- Pipeline systems.
How to Choose Between Duplex 2205 and 2507?
| Project Condition | Recommended Grade |
|---|---|
| General chemical equipment | Duplex 2205 |
| Offshore seawater environment | Super Duplex 2507 |
| Cost-sensitive industrial projects | Duplex 2205 |
| Extreme chloride exposure | Super Duplex 2507 |
| High strength lightweight design | Both grades depending on corrosion requirements |
Processing Options for Duplex Stainless Steel Plates
Professional duplex stainless steel suppliers provide additional services to improve project efficiency, including:
- Laser cutting.
- Waterjet cutting.
- CNC machining.
- Custom sizing.
- Welding preparation.
- Surface finishing.
- Export packaging.
Why Choose Teda Ganghua Duplex Stainless Steel Solutions?
Teda Ganghua provides stainless steel plate solutions for global industrial customers, including duplex stainless steel grades for demanding applications such as marine engineering, chemical processing, energy projects, and heavy equipment manufacturing.
With reliable supply capability, strict quality control, and customized processing services, Teda Ganghua helps customers select the right stainless steel grade based on corrosion requirements, mechanical performance, and total project cost.
Explore our complete stainless steel product catalog to find duplex stainless steel plates, stainless steel sheets, coils, and customized metal solutions.
Frequently Asked Questions
Is Duplex 2507 stronger than Duplex 2205?
Yes. Duplex 2507 has higher yield strength and tensile strength due to increased alloy content.
Which has better corrosion resistance, 2205 or 2507?
2507 provides better corrosion resistance, especially in seawater and high-chloride environments.
Is Duplex 2205 cheaper than 2507?
Yes. Duplex 2205 offers excellent performance at a lower material cost and is often selected for general industrial applications.
Can duplex stainless steel plates be customized?
Yes. Thickness, dimensions, cutting, and surface processing can be customized according to project requirements.
Product Inquiry
Relevant Products
TIANJIN TEDA GANGHUA
Tel: +86 22 86896631
Phone: +86 15822676888
Fax: +86 22 86896632
E-mail: sales1@tedaganghua.com
Office Hours:Mon – Fri / 9:00 AM – 6:00 PM
Address:Beichen Industrial Area, Beichen District, Tianjin 300400 China
Room A3101, Section 2, No. 122, Dongting Road, Tianjin Development Zone
Leave a message online
Copyright © 2023 TIANJIN TEDA GANGHUA