2205 Duplex Stainless Steel Plate
2205 duplex stainless steel is a type of duplex stainless steel with approximately equal proportions of ferritic and austenitic structures. Its core feature is that it combines the excellent toughness and weldability of austenitic stainless steel, as well as the high strength and chloride stress corrosion resistance of ferritic stainless steel, resulting in excellent comprehensive performance.
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Product Introduction

2205 Duplex Stainless Steel Plate represents one of the most widely used grades in the duplex stainless steel family. It is characterized by a balanced, near 50/50 microstructure of ferrite and austenite, which gives it a unique property profile superior to both standard austenitic and ferritic grades. This "duplex" nature combines exceptionally high mechanical strength with outstanding resistance to chloride-induced corrosion such as pitting, crevice corrosion, and, most notably, stress corrosion cracking.

Engineered as a nitrogen-alloyed duplex stainless steel, 2205 is purpose-built to solve the corrosion and strength limitations faced by common 300-series stainless steels in demanding environments. Its high yield strength enables lighter and more economical designs for pressure vessels and structural components. It is the material of choice for applications where standard 316L is inadequate, but more expensive nickel alloys or super duplex grades are not necessary.

Product parameters


Item / ParameterSpecification for 2205Notes / Significance
Key FeatureSuperior strength-to-corrosion ratio. High strength combined with excellent chloride and acid resistance, surpassing 316L.The primary reason to choose 2205 over 316L for demanding structural or corrosive applications.
Common DesignationsUNS S31803, UNS S32205, EN 1.4462, DIN 1.4462, SAF 2205, 00Cr22Ni5Mo3NS32205 has tighter chemical controls for superior performance. Confirm the specific grade with your supplier.
Chemical Composition (Typical wt.%)C: ≤ 0.030Cr: 21.0 - 23.0Ni: 4.5 - 6.5Mo: 2.5 - 3.5N: 0.08 - 0.20High Chromium & Molybdenum ensure corrosion resistance. Added Nitrogen significantly boosts strength and pitting resistance.
Mechanical Properties (Solution Annealed Plate)Yield Strength (Rp0.2): ≥ 450 MPa (Typically 640-700 MPa)Tensile Strength (Rm): ≥ 620 MPa (Typically 780-850 MPa)Elongation (A): ≥ 25%Hardness (HB): ≤ 290Yield strength is approximately double that of 316L. Allows for significant weight and cost savings in design.
Physical PropertiesDensity: 7.80 g/cm³Thermal Expansion: ~13.0 x10⁻⁶/K (20-300°C)Magnetism: Ferromagnetic (Yes)Lower thermal expansion than austenitic steels improves performance under thermal cycling.
Key Corrosion Resistance• Chloride Stress Corrosion Cracking: Excellent• Pitting & Crevice Corrosion: Far superior to 316L & 317L• Critical Pitting Temperature: Often > 50°C• Resists: Seawater, chloride media, dilute sulfuric & organic acidsUnmatched suitability for chloride-rich environments where 304/316 would fail.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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