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SAF Duplex 2205 Stainless Steel for Water and Wastewater Treatment Equipment and Components

Water and wastewater treatment facilities and equipment necessitate the utilization of resilient and corrosion-resistant materials to ensure the steadfastness and durability of their equipment and components.


In this context, the utilization of SAF Duplex 2205 stainless steel emerges as an outstanding choice, presenting an amalgamation of exceptional corrosion resistance, elevated strength, and cost-effectiveness.


This article aims to delve into the advantages and applications of SAF Duplex 2205 stainless steel mainly in the domain of water and wastewater treatment industries.




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SAF Duplex 2205 Stainless Steel


Table of Contents SAF Duplex 2205 Stainless Steel for Water and Wastewater Treatment Equipment and Components



 

Introduction to SAF Duplex 2205 Stainless Steel

SAF Duplex 2205 stainless steel is a duplex stainless steel alloy that combines the desirable properties of ferritic and austenitic stainless steels. It consists of approximately 22% chromium, 5% nickel, 3% molybdenum, and other alloying elements.


This composition provides SAF Duplex 2205 stainless steel with excellent corrosion resistance, high strength, and good weldability.

Compared with the conventional 300 series stainless steel (eg. AISI 304, and 316/316L) the special advantages of duplex 2205 stainless steel are strength (about twice that of austenitic stainless steel), and excellent resistance to chloride SCC and pitting corrosion. High yield strength has sufficient pressure and load capacity, and thin-wall materials can be made to greatly reduce weight.


SAF Duplex 2205 Stainless Steel Chemical Composition


The following table lists the chemical composition based on cast analysis of SAF Duplex 2205 Stainless Steel:



SAF Duplex 2205 Stainless Steel Chemical Composition Table
SAF Duplex 2205 Stainless Steel Chemical Composition



Physical Properties SAF Duplex 2205 Stainless Steel

Its unique microstructure consists of both ferrite and austenite phases, which contribute to its exceptional combination of properties.


Density

The density of SAF Duplex 2205 stainless steel is approximately 7.8 grams per cubic centimeter (g/cm³). This density is similar to other stainless steel alloys, making it a moderately dense material. The density of SAF Duplex 2205 stainless steel contributes to its overall strength and stability.


Melting Point

The melting point of SAF Duplex 2205 stainless steel is around 1350 to 1400 degrees Celsius (2462 to 2552 degrees Fahrenheit). This high melting point indicates its ability to withstand elevated temperatures without significant deformation or structural changes.


Thermal Expansion

SAF Duplex 2205 stainless steel has a relatively low coefficient of thermal expansion. Its thermal expansion coefficient is approximately 13.7 µm/m°C (7.6 µin/in°F) over the temperature range of 0 to 100 degrees Celsius (32 to 212 degrees Fahrenheit). This low thermal expansion coefficient helps to minimize dimensional changes and stress during temperature variations.


Magnetic Properties

SAF Duplex 2205 stainless steel exhibits a combination of both magnetic and non-magnetic properties. The presence of ferrite in its microstructure gives it a magnetic response. However, the austenitic phase reduces the overall magnetism. As a result, SAF Duplex 2205 stainless steel is generally considered to be a duplex stainless steel with moderate magnetic properties.


Electrical Conductivity

SAF Duplex 2205 stainless steel has good electrical conductivity. The electrical resistivity of SAF Duplex 2205 stainless steel is typically around 850 to 900 nano-ohm meters (µΩ·m). This property makes it suitable for various electrical applications where conductivity is required.


In the table below we summarized the all the physical properties of SAF Duplex 2205 stainless steel:

Physical Properties


Physical Properties of SAF Duplex 2205 Stainless Steel Table
Physical Properties of SAF Duplex 2205 Stainless Steel


Corrosion Resistance Properties

One of the key advantages of SAF Duplex 2205 stainless steel is its outstanding corrosion resistance.

It exhibits excellent resistance to a wide range of corrosive environments, including seawater, brackish water, and various chemicals encountered in water and wastewater treatment processes. The high chromium, molybdenum, and nitrogen content in SAF Duplex 2205 stainless steel contribute to its resistance against pitting, crevice corrosion, and stress corrosion cracking.


Strength and Durability

SAF Duplex 2205 stainless steel is renowned for its exceptional strength and durability. It offers higher strength than standard austenitic stainless steels, making it suitable for demanding applications in water and wastewater treatment facilities.

The enhanced strength of SAF Duplex 2205 stainless steel allows equipment and components to withstand mechanical stresses, pressure fluctuations, and vibrations, ensuring long-term performance and reliability.


Resistance to Chloride and Acid Attacks

Water and wastewater treatment processes often involve exposure to chlorides and various acids. SAF Duplex 2205 stainless steel demonstrates excellent resistance to chloride-induced corrosion, making it highly suitable for applications where chlorides are present, such as desalination plants and brackish water treatment facilities. Additionally, it offers good resistance to acid attack, providing protection against corrosive environments encountered in water treatment processes.



Applications of SAF Duplex 2205 Stainless Steel in Water and Wastewater Treatment Industry

SAF Duplex 2205 stainless steel finds extensive applications in water and wastewater treatment equipment and components, including:


Evaporators

In water and wastewater treatment processes, vacuum evaporators play a crucial role in concentrating liquid waste and recovering valuable resources. To ensure optimal performance and longevity in such demanding applications, SAF Duplex 2205 stainless steel is an excellent choice for constructing evaporators boilers and components. Such example are EVADEST evaporators.


Piping Systems

SAF Duplex 2205 stainless steel is commonly used for piping systems in water and wastewater treatment plants. Its corrosion resistance, strength, and weldability make it suitable for transporting water, chemicals, and wastewater with high reliability and minimal risk of leakage or corrosion-related failures.



SAF Duplex 2205 Stainless Steel Pipings
SAF Duplex 2205 Stainless Steel Pipings


Heat Exchangers

Heat exchangers play a crucial role in water and wastewater treatment processes, facilitating the transfer of heat between different fluids. SAF Duplex 2205 stainless steel offers excellent thermal conductivity, corrosion resistance, and mechanical strength, ensuring efficient heat transfer and prolonged operational life.


Tanks and Reactors

SAF Duplex 2205 stainless steel is well-suited for the construction of tanks and reactors in water and wastewater treatment facilities. Its corrosion resistance and durability ensure the containment and treatment of water and wastewater without compromising the structural integrity of the equipment.


Valves and Fittings

Valves and fittings made from SAF Duplex 2205 stainless steel provide reliable control and regulation of water and wastewater flow in treatment processes. They offer excellent resistance to corrosion and erosion, ensuring long-term functionality and minimizing maintenance requirements.


If you are unsure about the most suitable stainless steel for your application, you can get in touch with our team at any time.


SAF Duplex 2205 Equivalent Grade by International Standards

SAF Duplex 2205 stainless steel has equivalent grades designated by various international standards, ensuring its compatibility and recognition worldwide. Some of the commonly used equivalent grades are:

  • ASTM A182/A240: F51

  • EN/DIN: 1.4462

  • UNS S32205

In the table below we summarized the international standards for SAF Duplex 2205 stainless steel:

Equivalent grade and international standards for SAF Duplex 2205 stainless steel table
Equivalent Grade and International Standards for SAF Duplex 2205 Stainless Steel




Conclusion

SAF Duplex 2205 stainless steel is a versatile and reliable material for water and wastewater treatment equipment and components.


Its exceptional corrosion resistance, high strength, and cost-effectiveness make it an ideal choice for demanding applications in these industries.


By utilizing SAF Duplex 2205 stainless steel for water and wastewater treatment equipment, YASA can enhance their operational efficiency, reduce maintenance costs, and achieve sustainable treatment processes.


Get in touch with our team for a free quote for your project.


 

FAQs about SAF Duplex 2205 Stainless Steel


Q1. What is SAF Duplex 2205 stainless steel?

SAF Duplex 2205 stainless steel is a duplex stainless steel alloy that combines ferritic and austenitic properties. It offers superior corrosion resistance, high strength, and good weldability.


Q2. Can SAF Duplex 2205 stainless steel withstand harsh environments in water and wastewater treatment facilities?

Yes, SAF Duplex 2205 stainless steel exhibits excellent resistance to corrosive environments, including seawater, brackish water, and aggressive chemicals commonly found in water and wastewater treatment facilities.


Q3. Is SAF Duplex 2205 stainless steel cost-effective in the long run?

Yes, SAF Duplex 2205 stainless steel's durability and resistance to corrosion contribute to its cost-effectiveness over the long term by minimizing maintenance requirements and replacement costs.


Q4. Can SAF Duplex 2205 stainless steel be welded and fabricated easily?

Yes, SAF Duplex 2205 stainless steel can be welded and fabricated using standard techniques. However, it is important to follow proper procedures and guidelines to maintain its corrosion resistance and mechanical properties.


Q5. What are the advantages of using SAF Duplex 2205 stainless steel in water and wastewater treatment?

SAF Duplex 2205 stainless steel offers superior corrosion resistance, high strength, and cost-effectiveness, providing reliable and long-lasting solutions for water and wastewater treatment equipment and components.

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