The 2205 Duplex Stainless Steel Plate is a game-changer in the world of stainless alloys. It’s classified as a duplex stainless steel because its microstructure is a balanced mix of both austenitic and ferritic phases, typically around 50% of each. This unique dual-phase composition grants 2205 an extraordinary combination of properties that surpass those of traditional austenitic stainless steels like 304 and 316L. It’s celebrated for its exceptionally high strength, excellent resistance to general corrosion, pitting, crevice corrosion, and stress corrosion cracking.

We understand that engineers and designers face increasing pressure to select materials that can withstand aggressive environments while optimizing structural integrity. 2205 duplex stainless steel rises to this challenge, offering a superior alternative for critical applications where the performance limits of standard austenitic grades are met. Its outstanding resistance to chloride-induced corrosion and high strength-to-weight ratio make it indispensable in industries ranging from oil and gas to chemical processing and marine environments.

At Luokaiwei, we are committed to providing 2205 Duplex Stainless Steel Plates that meet the highest international standards. We ensure that every plate delivers the consistent, reliable, and high-performance characteristics that your demanding projects require.

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Properties of 2205 Duplex Stainless Steel

 

The remarkable performance of 2205 duplex stainless steel stems from its balanced microstructure and precisely controlled chemical composition. Let’s explore its key properties.

 

Mechanical Properties

 

The mechanical properties of 2205 duplex stainless steel are a significant highlight, particularly its high strength, which is roughly double that of standard austenitic grades.

Property	Metric Value	Imperial Value
Tensile Strength	620 MPa (min)	90 ksi (min)
Yield Strength (0.2% Offset)	450 MPa (min)	65 ksi (min)
Elongation (in 50mm)	25% (min)	25% (min)
Hardness (Rockwell C)	32 max	32 max
Hardness (Brinell)	241 max	241 max
Impact Toughness (Room Temp)	80 J (avg)	59 ft-lb (avg)

 

Physical Properties

 

The physical properties of 2205 duplex stainless steel contribute to its overall suitability for demanding applications, including lower thermal expansion than austenitic grades.

Property	Metric Value	Imperial Value
Density	7.82 g/cm³	0.283 lb/in³
Melting Range	1390 – 1450 °C	2530 – 2640 °F
Thermal Conductivity	16.0 W/m·K (at 100°C)	9.2 BTU/ft·hr·°F (at 212°F)
Specific Heat	500 J/kg·K (at 0-100°C)	0.12 BTU/lb·°F (at 32-212°F)
Electrical Resistivity	850 nΩ·m	511 ohm-circ mil/ft
Coefficient of Thermal Expansion (0-100°C)	13.7 µm/m·°C	7.6 µin/in·°F

 

Corrosion Resistance

 

The corrosion resistance of 2205 duplex stainless steel is a standout feature. Its balanced ferritic-austenitic structure, combined with high chromium, molybdenum, and nitrogen content, provides exceptional resistance across a spectrum of corrosive environments.

• Pitting and Crevice Corrosion: 2205 offers significantly superior resistance to pitting and crevice corrosion compared to 316L and even 317L, particularly in chloride-containing media. Its Pitting Resistance Equivalent Number (PREN) typically ranges from 33-34, indicating its high performance.
• Stress Corrosion Cracking (SCC): One of the most significant advantages of 2205 is its excellent resistance to chloride stress corrosion cracking, a common failure mode for austenitic stainless steels in hot chloride environments. The ferritic phase in its microstructure greatly enhances this resistance.
• General Corrosion: It exhibits high resistance to general corrosion in various acidic and oxidizing environments, including sulfuric acid, nitric acid, and phosphoric acid.
• Erosion-Corrosion: 2205 also possesses good resistance to erosion-corrosion and corrosion fatigue, making it suitable for applications involving abrasive media or dynamic loading in corrosive settings.

While 2205 is highly resistant, it’s susceptible to embrittlement if exposed to temperatures above 300°C (572°F) for extended periods due to the formation of undesirable phases. Therefore, its continuous service temperature is generally limited to below this threshold.

 

Fabrication and Heat Treatment

 

Working with 2205 duplex stainless steel requires specific considerations due to its unique microstructure.

• Forming: 2205 has good formability, but its higher strength means it requires more power to form compared to austenitic grades. Cold forming is possible, but its lower ductility compared to 304 or 316L means it’s less suited for severe deep drawing. Hot forming is recommended within specific temperature ranges (typically 1100°C to 1150°C or 2010°F to 2100°F) to ensure optimal properties.
• Welding: 2205 possesses good weldability. However, precise control of heat input is critical to maintain the optimal ferrite-austenite balance in the weld metal and heat-affected zone (HAZ), which is crucial for retaining its excellent corrosion resistance and mechanical properties. Overheating can lead to excessive ferrite, reducing toughness and corrosion resistance. Specific filler metals, typically those with higher nickel and nitrogen, are used to achieve the desired balance.
• Heat Treatment: Like other duplex stainless steels, 2205 cannot be hardened by heat treatment. It can only be hardened by cold working. The primary heat treatment is solution annealing, performed at temperatures typically between 1020°C and 1100°C (1868°F to 2012°F), followed by rapid quenching to restore the optimal duplex microstructure, ductility, and corrosion resistance after forming or welding.

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Dimensions and Parameters of 2205 Duplex Stainless Steel Plate

 

At Luokaiwei, we stock and supply 2205 duplex stainless steel plates in a comprehensive range of dimensions to cater to diverse industrial requirements. We also accommodate custom specifications.

 

Standard Plate Dimensions

 

Our typical stock dimensions for 2205 duplex stainless steel plates include:

Thickness (mm)	Width (mm)	Length (mm)
3.0 – 6.0	1000	2000
3.0 – 6.0	1219	2438
3.0 – 6.0	1500	3000
6.0 – 150.0	1500	6000
6.0 – 150.0	2000	6000
6.0 – 150.0	2500	8000

Note: For thicknesses above 150mm or for specific custom sizes, wide plates (up to 3000mm), and extra-long plates, please consult with our sales and technical team. We offer tailored solutions.

 

Surface Finishes

 

While 2205 duplex stainless steel is primarily chosen for its functional performance rather than aesthetics, we offer various surface finishes that can impact its application and processability:

• No. 1 Finish: Hot-rolled, annealed, and descaled. This is a rough, dull finish suitable for industrial applications where smooth appearance is not critical, but high strength and corrosion resistance are.
• 2B Finish: Cold-rolled, annealed, pickled, and pinch-passed. This general-purpose finish offers a smooth, moderately reflective surface that’s widely used across industries.
• Pickled & Oiled (P/O): A common finish for heavy gauge plates, offering improved surface quality over No. 1 and preparing the surface for subsequent processing.

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Chemical Composition of 2205 Duplex Stainless Steel

 

The superior properties of 2205 duplex stainless steel are directly attributable to its meticulously controlled chemical composition, particularly the higher levels of chromium, molybdenum, and nitrogen.

Element	Weight (%)
Carbon (C)	0.030 max
Manganese (Mn)	2.00 max
Phosphorus (P)	0.030 max
Sulfur (S)	0.020 max
Silicon (Si)	1.00 max
Chromium (Cr)	22.0 – 23.0
Nickel (Ni)	4.5 – 6.5
Molybdenum (Mo)	3.0 – 3.5
Nitrogen (N)	0.14 – 0.20
Iron (Fe)	Balance

We ensure that every 2205 duplex stainless steel plate from Luokaiwei strictly adheres to these compositional limits, guaranteeing the high performance and reliability you expect from this advanced alloy. The low carbon content is particularly important for minimizing sensitization during welding.

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2205 Duplex Stainless Steel vs. Other Stainless Steel Grades

 

Understanding the distinct advantages of 2205 duplex stainless steel in comparison to other common stainless steel grades is crucial for optimal material selection.

 

2205 Duplex Stainless Steel vs. 304 Stainless Steel

 

304 stainless steel is a workhorse austenitic grade, but 2205 duplex offers significant performance upgrades for demanding applications.

Feature	2205 Duplex Stainless Steel	304 Stainless Steel
Microstructure	Austenitic-Ferritic (Duplex)	Austenitic
Yield Strength	More than double that of 304	Standard
Tensile Strength	Significantly higher	Standard
Corrosion Resistance	Superior (especially in chlorides, SCC)	Good (vulnerable to chlorides, SCC)
Pitting Resistance	Excellent (high PREN)	Moderate (lower PREN)
Stress Corrosion Cracking	Excellent resistance	Susceptible in hot chlorides
Cost	Higher	Lower
Weldability	Good, but requires control	Excellent
Temperature Limit	Max 300°C (embrittlement risk above)	Higher operating temperature limits

For applications in corrosive environments, particularly those involving chlorides, or where high strength is critical, 2205 duplex stainless steel far outperforms 304 stainless steel. While 2205 has a higher initial cost, its extended service life and reduced maintenance in aggressive conditions often lead to lower total lifecycle costs.

 

2205 Duplex Stainless Steel vs. 316L Stainless Steel

 

316L stainless steel is an austenitic grade known for its improved corrosion resistance over 304 due to the addition of molybdenum. However, 2205 duplex still offers a notable leap in performance.

Feature	2205 Duplex Stainless Steel	316L Stainless Steel
Yield Strength	Roughly double that of 316L	Standard
Corrosion Resistance	Superior (especially in chlorides, SCC)	Good (improved over 304, but less than 2205 in chlorides)
Pitting Resistance	Excellent (higher PREN)	Good (molybdenum helps, but lower PREN than 2205)
Stress Corrosion Cracking	Excellent resistance	Susceptible in hot chlorides, though less than 304
Fabrication	Requires more power for forming, controlled welding	Easier to form and weld
Cost	Higher than 316L	Moderate
Thermal Expansion	Lower (closer to carbon steel)	Higher

Even with molybdenum, 316L cannot match the stress corrosion cracking resistance of 2205 duplex in chloride environments. The higher strength of 2205 also allows for thinner sections, potentially leading to weight and material savings in certain designs. While 316L is excellent for many applications, 2205 is the preferred choice for truly aggressive and demanding scenarios.

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Application Industries for 2205 Duplex Stainless Steel Plate

 

The unparalleled combination of strength and corrosion resistance makes 2205 Duplex Stainless Steel Plate an ideal material for a wide array of demanding applications across various industries. At Luokaiwei, we frequently supply 2205 for:

 

Oil and Gas Industry

 

This sector heavily relies on 2205 for its resistance to chloride stress corrosion cracking and general corrosion in harsh environments.

• Pipes and flowlines: For transporting corrosive oil and gas.
• Separators and scrubbers: Equipment for processing crude oil and natural gas.
• Heat exchangers: Handling corrosive fluids at elevated temperatures.
• Wellhead equipment and subsea equipment: Where durability and resistance to extreme conditions are crucial.
• Storage tanks and pressure vessels: For sour gas and chemical storage.

 

Chemical Processing Industry

 

2205 is widely used in chemical plants due to its resistance to various acids and chlorides.

• Pressure vessels, reactors, and tanks: For handling aggressive chemicals.
• Piping systems: Transporting corrosive solutions.
• Heat exchangers and condensers: Operating in corrosive environments.
• Evaporators and dissolvers: Used in various chemical processes.

 

Marine and Shipbuilding Industry

 

Its excellent resistance to saltwater corrosion and high strength are invaluable for marine applications.

• Propeller shafts and rudders: Components exposed to seawater.
• Desalination plants: For critical equipment in water purification.
• Offshore platforms: Structural components requiring high strength and corrosion resistance.
• Cargo tanks: For chemical tankers.

 

Pulp and Paper Industry

 

This industry often deals with aggressive bleaching chemicals and high temperatures.

• Digesters and bleach washers: Equipment used in pulp production.
• Pulp liquor heaters: Handling corrosive liquors.
• Paper machine rolls: Requiring high strength and corrosion resistance.

 

Water Treatment and Desalination

 

With the growing need for fresh water, 2205 is increasingly used in water treatment facilities.

• Reverse osmosis plants: For high-pressure piping and vessels.
• Filtration systems: Components exposed to various water qualities and chemicals.

 

Structural and Civil Engineering

 

The high strength-to-weight ratio of 2205 allows for innovative designs and reduced material usage in certain structural applications.

• Bridges and tunnels: Where durability and resistance to environmental factors are key.
• Load-bearing applications: Where the combined strength and corrosion resistance offer advantages over traditional materials.

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Global Price Comparison for 2205 Duplex Stainless Steel Plate

 

The pricing of 2205 Duplex Stainless Steel Plate is influenced by global market factors, including the cost of raw materials (especially nickel, chromium, and molybdenum), energy costs, and demand. As a high-performance alloy, it typically commands a higher price than standard austenitic or ferritic stainless steels.

 

Factors Influencing Price

 

• Alloying Elements: The higher content of expensive elements like chromium, nickel, and particularly molybdenum, significantly contributes to its cost. Nitrogen also plays a role.
• Production Complexity: The manufacturing process for duplex stainless steels is more intricate due to the need to control the dual-phase microstructure, which adds to production costs.
• Global Demand: High demand from critical industries (e.g., oil and gas, chemical) can push prices up.
• Plate Dimensions and Thickness: Larger and thicker plates generally have higher per-unit prices due to increased material usage and processing time.
• Surface Finish and Certification: Specific surface finishes or extra certifications can impact the final cost.
• Order Quantity: As with most materials, larger volumes typically qualify for better per-unit pricing.
• Regional Market Conditions: Prices can vary based on local supply, demand, and economic conditions.

 

Estimated Price Ranges (Per Tonne)

 

As of mid-2025, the approximate global price ranges for 2205 Duplex Stainless Steel Plate (per metric ton) are:

• Asia (e.g., China, India): $3,000 – $5,000 USD per metric ton
• Europe: $3,500 – $5,500 USD per metric ton
• North America: $3,800 – $6,000 USD per metric ton

Please note: These prices are indicative and subject to significant fluctuations based on current market volatility, specific supplier, exact specifications (e.g., thickness, width, length), surface finish, and order volume. For the most accurate and up-to-date pricing, we strongly recommend reaching out directly to Luokaiwei for a customized quote.

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Purchasing Advice for 2205 Duplex Stainless Steel Plate

 

Investing in 2205 Duplex Stainless Steel Plate requires careful consideration to ensure you receive a product that precisely meets your demanding application needs. Here’s our expert advice:

 

1. Rigorously Define Application and Environment

 

Given 2205’s specialized properties, it’s crucial to confirm its suitability. While it excels in many aggressive environments, ensure it aligns with your specific needs. Consider:

• Corrosive Media: Type, concentration, and temperature of chemicals.
• Chloride Levels: Especially critical for pitting and SCC.
• Operating Temperature Range: Remember the 300°C embrittlement limit.
• Mechanical Load Requirements: Leverage its high strength if applicable.

If your application involves extremely high temperatures or even more aggressive corrosion than 2205 can handle, consider Super Duplex grades (e.g., 2507) or even higher alloys.

 

2. Prioritize Quality and Comprehensive Documentation

 

For a high-performance alloy like 2205, quality control is paramount. Always demand:

• Mill Test Certificates (MTCs): These are non-negotiable. MTCs provide verifiable data on chemical composition, mechanical properties, and compliance with ASTM A240 (for plates) and other relevant standards (e.g., UNS S32205 for enhanced properties or UNS S31803).
• Reputable Suppliers: Choose suppliers with a proven track record in specialty alloys and those who can demonstrate rigorous quality assurance processes.
• Traceability: Ensure the material’s origin and processing history are fully traceable.

 

3. Consider Fabrication Capabilities

 

2205’s higher strength and specific welding requirements mean that not all fabricators are equally equipped to work with it.

• Consult with your fabricator early in the process to ensure they have the necessary expertise, equipment, and welding procedures for duplex stainless steels.
• Discuss welding consumables: The choice of filler metal is crucial for maintaining the desired duplex microstructure and properties in the weld.

 

4. Optimize Dimensions and Quantity

 

While 2205 is more expensive, its superior strength often allows for thinner section designs, potentially reducing overall material weight and cost.

• Work with your design team to optimize dimensions to fully leverage 2205’s strength, potentially leading to material savings.
• Order strategically: Consider larger quantities for better per-unit pricing if your project pipeline allows.

 

5. Evaluate Total Cost of Ownership

 

Focus on the long-term value. While the upfront cost of 2205 is higher, its extended service life, reduced downtime, lower maintenance, and superior performance in challenging conditions often result in significant cost savings over the lifespan of the equipment or structure.

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Why Choose Luokaiwei for 2205 Duplex Stainless Steel Plate?

 

At Luokaiwei, we pride ourselves on being more than just a supplier; we are a dedicated partner in providing high-quality, high-performance materials for your most demanding projects. When you choose us for your 2205 Duplex Stainless Steel Plate requirements, you benefit from:

• Unrivaled Quality Assurance: We source our 2205 duplex stainless steel plates exclusively from reputable, globally recognized mills that adhere to the strictest international standards, including ASTM A240/A240M with UNS S32205 (for enhanced properties) or S31803 designations. Every plate comes with comprehensive, verifiable Mill Test Certificates, guaranteeing its chemical composition, mechanical properties, and structural integrity.
• Extensive Inventory and Custom Solutions: We maintain a substantial stock of 2205 duplex plates in a wide array of standard thicknesses, widths, and lengths, ensuring prompt availability for your urgent needs. Furthermore, our advanced processing capabilities allow us to provide custom-cut sizes, specialized finishes, and tailored dimensions to meet the precise demands of your unique applications.
• Expert Technical Guidance: Our team comprises experienced metallurgists and knowledgeable sales engineers who possess profound expertise in duplex stainless steels. We’re here to offer invaluable technical consultations, assisting you with material selection, welding considerations, fabrication advice, and optimizing the use of 2205 for superior performance in your specific operating environment.
• Competitive and Transparent Pricing: Leveraging our robust global supply chain and long-standing relationships with mills, we offer highly competitive pricing for 2205 duplex stainless steel plates. We strive to provide the best possible value, ensuring you receive premium quality material at a fair and transparent cost.
• Reliable Global Logistics: We understand that timely delivery is critical to your project’s success. Our efficient and reliable logistics network ensures secure and prompt delivery of your 2205 duplex stainless steel plates, minimizing lead times and keeping your project schedules on track, regardless of your global location.
• Dedicated Customer Partnership: Your satisfaction is the cornerstone of our business. We are committed to building lasting relationships with our clients through exceptional service, unwavering support, and a responsive approach to all your inquiries, from initial consultation through to post-delivery assistance.

Partner with Luokaiwei to leverage the full potential of 2205 Duplex Stainless Steel Plate. Contact us today to discuss your project needs, request a detailed quote, or explore how our expertise can contribute to your success.

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Frequently Asked Questions (FAQs) about 2205 Duplex Stainless Steel Plate

 

 

Q1: What makes 2205 “duplex” stainless steel?

 

2205 is called “duplex” because its microstructure consists of a balanced combination of two phases: austenite (like 304 and 316) and ferrite. This unique dual-phase structure provides it with a superior combination of properties not found in single-phase stainless steels, particularly high strength and excellent resistance to various forms of corrosion, including stress corrosion cracking.

 

Q2: What are the main advantages of 2205 duplex stainless steel over 316L stainless steel?

 

The main advantages of 2205 over 316L are its significantly higher strength (roughly double the yield strength), and superior corrosion resistance, especially to chloride-induced pitting, crevice corrosion, and stress corrosion cracking. 2205 also has a lower coefficient of thermal expansion, making it more compatible with carbon steel in composite structures.

 

Q3: Can 2205 duplex stainless steel be used at high temperatures?

 

While 2205 has good oxidation resistance, it is generally not recommended for continuous service at temperatures above 300°C (572°F). Prolonged exposure above this temperature range can lead to the formation of brittle intermetallic phases, which severely degrade its toughness and corrosion resistance. For very high-temperature applications, other specialized high-alloy stainless steels or nickel alloys might be more suitable.

 

Q4: Is 2205 duplex stainless steel difficult to weld?

 

2205 is weldable, but it requires more precise control of welding parameters compared to austenitic stainless steels like 304 or 316L. The key is to maintain the optimal ferrite-austenite balance in the weld metal and heat-affected zone. This often involves careful control of heat input, interpass temperature, and the use of specific welding consumables with higher nickel and nitrogen content to ensure the weld retains the desirable properties of the base metal.

 

Q5: In what types of environments is 2205 duplex stainless steel most beneficial?

 

2205 duplex stainless steel is most beneficial in highly corrosive environments, particularly those containing chlorides, where high strength is also required. This includes environments found in the oil and gas industry (sour wells, pipelines), chemical processing (acidic solutions, high chlorides), marine and shipbuilding (saltwater exposure), and water treatment/desalination plants. Its resistance to stress corrosion cracking is a major advantage in these applications.

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We trust this detailed overview of 2205 Duplex Stainless Steel Plate is valuable for your material selection process. Should you require further clarification or wish to discuss your specific project needs, please don’t hesitate to reach out.