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2205 Stainless Steel

2205 Stainless Steel, also known as Duplex 2205, is a nitrogen-enhanced duplex stainless steel designed to address common corrosion issues encountered with the 300 series stainless steels. It provides a balanced duplex structure that combines the corrosion resistance and high strength of ferritic stainless steels with the ductility and weldability of austenitic steels. Due to its superior resistance to chloride stress corrosion cracking, pitting, and crevice corrosion, 2205 is ideal for applications in marine, chemical, and oil and gas industries.

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Chemical Composition of 2205 Stainless Steel

Element	Composition (%)
Carbon (C)	≤ 0.03
Chromium (Cr)	21.0 – 23.0
Nickel (Ni)	4.5 – 6.5
Molybdenum (Mo)	2.5 – 3.5
Nitrogen (N)	0.08 – 0.20
Manganese (Mn)	≤ 2.0
Silicon (Si)	≤ 1.0
Phosphorus (P)	≤ 0.030
Sulfur (S)	≤ 0.020
Iron (Fe)	Balance

Technical Specifications of 2205 Stainless Steel

Physical Properties

Property	Metric	Imperial
Density	7.8 g/cm³	0.282 lb/in³
Elastic Modulus	190 GPa	27.6 x 10⁶ psi
Thermal Conductivity (at 100°C)	19 W/m·K	11 BTU/hr·ft·°F
Coefficient of Thermal Expansion	13.7 µm/m°C	7.6 x 10⁻⁶ in/in°F
Specific Heat	418 J/kg·K	0.1 BTU/lb·°F
Electrical Resistivity	850 nΩ·m	33.5 µΩ·in

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
Annealed	≥ 620	≥ 448	25	≤ 293
Cold Worked	Varies by process	High values	Reduced	–

Thermal Properties

Property	Metric	Imperial
Thermal Conductivity	19 W/m·K at 100°C	11 BTU/hr·ft·°F
Coefficient of Thermal Expansion	13.7 µm/m°C	7.6 x 10⁻⁶ in/in°F
Melting Point	Approximately 1440°C	Approximately 2624°F

Electrical Properties

Property	Metric	Imperial
Electrical Resistivity	850 nΩ·m	33.5 µΩ·in

Product Specifications by Solitaire Steel & Engineering LLP

Product Type	Standards	Sizes	Types	Applications
Sheets & Plates	ASTM A240	Thickness: 1mm – 50mm	Hot Rolled, Cold Rolled	Chemical processing, marine vessels
Pipes & Tubes	ASTM A790, A789	Diameter: 6mm – 1200mm	Seamless, Welded	Oil & gas piping, water treatment
Bars	ASTM A276	Diameter: up to 100mm	Round, Square, Hex	Shafts, fasteners, industrial parts
Angles, Channels, Beams	ASTM A484	Custom sizes available	L-Angles, U-Channels, I-Beams	Structural use in high-stress environments
Fittings	ASTM A815	Size: 1/2″ – 72″	Buttweld, Socket Weld	Process piping, marine and chemical industries

Processing and Fabrication Properties of 2205 Stainless Steel

Forming: Good formability, but allowances must be made for its high strength.
Welding: Duplex 2205 can be welded using standard methods. AS 1554.6 suggests 2209 electrodes to ensure proper balance. Avoid welding without filler metal to prevent excessive ferrite.
Heat Treatment:
- Annealing: Best performed at 1020-1100°C followed by rapid cooling.
- Hardening: Not hardenable by heat treatment, though it is work-hardenable.
Machinability: Requires lower cutting speeds compared to 304-grade stainless due to higher strength. High-power machines are recommended.

Applications of 2205 Stainless Steel

2205 Stainless Steel is widely used in applications requiring high corrosion resistance and mechanical strength, such as:

Chemical Process Industry: For vessels, piping, and heat exchangers.
Marine Applications: Used in ships, oil platforms, and saltwater systems.
Oil & Gas Industry: Ideal for pipelines, tubing, and fittings exposed to high chloride environments.
Food Processing Equipment: Suitable for storage and handling of food items due to its corrosion resistance.
Pulp & Paper Industry: Commonly used for digesters, bleaching equipment, and tanks.
Other: Biofuel processing plants, cargo tanks, and effluent scrubbing systems.