2205 Duplex

2205 Duplex

Nickel (Ni) - 5.5 Median
(4.5 Min - 6.5 Max)
Chromium (Cr) - 22.5 Median
(22.0 Min - 23.0 Max)
Molybdenum (Mo) - 3.25 Median
(3.0 Min - 3.5 Max)
Iron (Fe) - 65.47 Balance
Manganese (Mn) - 2 Max
Silicon (Si) - 1 Max
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 5.5 Median
    (4.5 Min - 6.5 Max)
  • Chromium (Cr) 22.5 Median
    (22.0 Min - 23.0 Max)
  • Molybdenum (Mo) 3.25 Median
    (3.0 Min - 3.5 Max)
  • Iron (Fe) 65.47 Balance
  • Manganese (Mn) 2 Max
  • Carbon (C) .03 Max
  • Silicon (Si) 1 Max
  • Nitrogen (N) .20 Max
  • Phosphorus (P) .03 Max
  • Sulfur (S) .02 Max

UNS S31803, S32205

Alloy 2205 gets the name Duplex because it is composed of two different types of grains. 40-50% of its grain structure is austenite and 50-60% of it is ferrite. It is closely related to, but much more popular than Alloy 255. In most environments, it surpasses 317L in crevice corrosion resistance. 2205 Duplex excels in chloride environments and resists hydrogen sulfide. 2205 Duplex has almost twice the strength of 316L. Due to the lower nickel and molybdenum content, it is less costly than Alloy C276. Among the places where 2205 Duplex is used include pressure vessels, heat exchangers and scrubbing systems.

Choosing the right materials can make all the difference in industries where reliability and performance are paramount. 2205 Duplex stainless steel offers a robust solution for harsh environments, combining strength and versatility. At Nickel Systems, we understand the critical nature of your applications. We are the largest stocking distributor of exotic alloy fasteners, with a vast inventory that allows us to ship hard-to-find items for immediate delivery.

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Summary

  • Environment:
    Moderately Corrosive: Acids & Chemicals
  • Temperature Limit:
    570 °F / 299 °C
  • Ultimate Tensile (Typical):
    105 ksi / 724 mpa

Specifications & Technical Data

If your question isn’t answered below, download the technical data sheet here.

Specifications

  • Plate: ASTM A240
  • Bar: ASTM A276

Physical Properties

Temperature ºF 68 212 392 572
Density lb/in3 0.278
Modulus of Elasticity psi x 106 27.6 26.1 25.4 24.9
Linear Expansion (68ºF-T) 10-6/ºF 7.5 7.8 8.1
Thermal Conductivity Btu/h ftºF 8.7 9.2 9.8 10.4
Heat Capacity Btu/lb/ºF 0.112 0.119 0.127 0.134
Electrical Resistivity Ωin x 10-6 33.5 35.4 37.4 39.4

Mechanical Properties

Mechanical Properties at Room Temperature
ASTM A 240 Typical
Yield Strength 0.2%, ksi 65 min. 74
Tensile Strength, ksi 90 min. 105
Elongation, % 25 min. 30
Hardness RC 32 max. 19

 

Tensile Properties at Elevated Temperatures
Temperature ºF 122 212 392 572
Yield Strength 0.2%, ksi 60 52 45 41
 Tensile Strength, ksi 96 90 83 81

Corrosion Resistance

Nitric Acid Good
Phosphoric Acid Moderate
Sodium Hydroxide Moderate
Sea Water Moderate
Humidity Excellent
Sulfuric Acid  Moderate
Acetic Acid Good
Salt Spray (NaCl) Excellent
Sour Oil/Gas Moderate

 

General Corrosion in Wet Process: Phosphoric Acids
Grade Corrosion Rate, ipy
Solution A, 140ºF Solution B, 120ºF
2205 3.1 3.9
316L >200 >200
904L 47 6.3
Composition, wt %
P2O5 HCI HF H2SO4 Fe2O3 Al2O3 SiO2 CaO MgO
Sol A 54.0 0.06 1.1 4.1 0.27 0.17 0.10 0.20 0.70
Sol B 27.5 0.34 1.3 1.72 0.4 0.01 0.3 0.02

 

Stress Corrosion Cracking Resistance
Grade Boiling Wick Boiling
42% MgCl2 Test 25% NaCl
2205 F P P
254 SMO® F P P
Type 316L F F F
Type 317L F F F
Alloy 904L F P or F P or F
Alloy 20 F P P

(P = Pass, F = Fail)

 

Processing

Hot Forming & Heat Treatment
Max Forming Temp. (recommended) 600°F
Working Range 1750° – 2250°F
Minimum Annealment Temp. (full solution) 1900°F

 

Understanding 2205 Duplex

As industries evolve, the demand for materials that offer durability and cost efficiency grows. 2205 alloy is at the forefront of this demand, providing a balanced solution that meets the needs of various demanding applications.

What Is Duplex 2205?

Alloy 2205 gets the name “Duplex” because it is composed of two different types of grains. 40-50% of its grain structure is austenite and 50-60% of it is ferrite. It is closely related to, but much more popular than Alloy 255. In most environments, it surpasses 317L in crevice corrosion resistance.

2205 Duplex excels in chloride environments and resists hydrogen sulfide. It has almost twice the strength of 316L. Due to the lower nickel and molybdenum content, it is less costly than Alloy C276. Among the places where 2205 Duplex is used include pressure vessels, heat exchangers and scrubbing systems.

2205 Duplex Characteristics

2205 Duplex is renowned for its exceptional physical and mechanical properties. It provides high-yield strength, making it an excellent choice for structural applications. Its resistance to corrosion, especially pitting and crevice corrosion in aggressive environments, further enhances its appeal. Additionally, 2205 stainless steel exhibits good weldability and fabrication capabilities, making it suitable for a wide range of industrial applications.

 

Advantages of 2205 Duplex

2205 Duplex offers a multitude of benefits that make it a standout choice for demanding applications:

  • Superior strength: With nearly twice the yield strength of standard austenitic stainless steels like 316L, 2205 Duplex allows for reduced material thickness in applications, leading to weight and cost savings.
  • Excellent corrosion resistance: 2205 stainless steel provides outstanding resistance to crevice corrosion, pitting and chloride stress corrosion cracking, making it suitable for use in harsh environments.
  • Cost-effectiveness: Despite its high performance, 2205 alloy is more cost-effective than high-nickel alloys due to its lower nickel and molybdenum content, offering an attractive balance of cost and performance.
  • Good weldability and fabrication: Duplex 2205 can be easily welded and fabricated without compromising its strength or corrosion resistance, making it adaptable to complex designs and challenging applications.

Applications of 2205 Duplex

The versatility and unique properties of 2205 Duplex make it an ideal choice for numerous industries where both strength and corrosion resistance are critical. Some of the key applications include:

  • Oil and gas
  • Aerospace
  • Chemical processing
  • Marine engineering
  • Pulp and paper
  • Food processing

 

2205 Duplex Fasteners

Fasteners play a crucial role in the integrity of any structure or system. At Nickel Systems, we offer a comprehensive range of Duplex 2205 fasteners to meet the diverse requirements of our customers, including:

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Industries We Serve

Nickel Systems provides high-quality exotic-grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to serve the most challenging applications.

  • Air pollution control
  • Chemical processing
  • Electronics and semiconductors
  • Power generation
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Contact Nickel Systems Experts

At Nickel Systems, we are committed to providing our clients with top-quality fasteners and unparalleled customer service. With our extensive inventory, most 2205 Duplex products are available for immediate delivery, helping your projects stay on schedule.

Request a quote today or contact us to discuss your project requirements and find out how we can help you achieve success with the right materials and expert guidance.

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