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  • 2205 Duplex Stainless Steel Coil

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2205 Duplex Stainless Steel Coil
2205 Duplex Stainless Steel Coil is a nitrogen-alloyed, two-phase steel consisting of a microstructure of approximately 50% austenite and 50% ferrite. This structure combines the advantages of both phases, offering high strength, excellent toughness, and superior resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion. It is supplied in coil form for efficient continuous processing and fabrication.
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◉ PRODUCT SPECIFICATION


1. Standard Designations


  • UNS: S32205 / S31803

  • ASTM: A789 / A790 (For tubular products) | Sheet/Strip to A240

  • EURONORM: 1.4462

  • JIS: SUS 329J3L

  • GB/T: 022Cr22Ni5Mo3N


2. Chemical Composition (% by weight, Typical)


Element

Carbon (C)

Silicon (Si)

Manganese (Mn)

Phosphorus (P)

Sulfur (S)

Chromium (Cr)

Nickel (Ni)

Molybdenum (Mo)

Nitrogen (N)

Min.

-

-

-

-

-

22.00

4.50

3.00

0.14

Max.

0.030

1.00

2.00

0.030

0.020

23.00

6.50

3.50

0.20


3. Mechanical Properties (at Room Temperature, for Annealed Condition)


Property

Yield Strength (0.2% Offset)

Tensile Strength

Elongation (in 2")

Hardness (Brinell)

Value

≥ 450 MPa (65 ksi)

≥ 620 MPa (90 ksi)

≥ 25%

≤ 293 HBW

(Note: The yield strength of 2205 is approximately twice that of standard austenitic stainless steels like 304 or 316.)


4. Physical Properties (Typical)


Property

Value

Density

7.80 g/cm³ (0.282 lb/in³)

Melting Range

1380 - 1450 °C (2515 - 2640 °F)

Modulus of Elasticity

200 GPa (29 x 10⁶ psi)

Thermal Conductivity (100°C)

19.0 W/m·K

Coefficient of Thermal Expansion (20-100°C)

13.7 x 10⁻⁶ /K


5. Corrosion Resistance


  • Stress Corrosion Cracking (SCC): Excellent resistance to chloride-induced SCC, far superior to 300-series austenitic steels.

  • Pitting & Crevice Corrosion: Outstanding resistance due to high PREN value.

    • PREN = %Cr + 3.3×%Mo + 16×%N ≈ 34-36

  • General Corrosion: Resistance is comparable to 316L, and superior in many environments, particularly those containing chlorides.


6. Available Product Range (Coil)


Parameter

Standard Range (May vary by supplier)

Thickness

0.5 mm (0.020") to 6.0 mm (0.236") or thicker

Width

600 mm (24") to 2000 mm (79") [Standard: 1000mm, 1219mm, 1500mm]

Coil ID (Inner Diameter)

508 mm (20") / 610 mm (24")

Coil OD (Outer Diameter)

1000 mm - 1500 mm (39" - 59")

Delivery Condition

Solution Annealed, Pickled, and Passivated


7. Common Surface Finishes for Coil


  • 2D: A dull, matte finish produced by heat treatment (annealing) and pickling, suitable for industrial applications.

  • 2B: A smooth, moderately reflective finish achieved by a final light cold-roll pass (skin-pass) after annealing and pickling. This is the most common finish for coils.


8. Typical Applications


  • Oil & Gas Industry: Pipeline systems, pressure vessels, heat exchangers.

  • Chemical Process Industry: Tanks, reactors, and process piping.

  • Marine & Offshore: Seawater piping systems, desalination equipment.

  • Pulp & Paper Industry: Digesters, bleach plants.

  • Chemical Tankers: Transportation of corrosive cargoes.

◉ Surfcae selection

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SURFACE CHARACTERISTIC SUMMARY OF MANUFACTURING METHOD APPLICATION
NO.1 Silvery white Hot rolled to specified thickness Do not need to have a glossy surface use
lackluster
NO.2D Silvery white After cold rolling, heat treatment and pickling are carried out General material, deep material
NO.2B Gloss is stronger than No.2D After No.2D treatment, the final light cold rolling is carried out through the polishing roller The general material
BA As bright as a sixpence No standard, but usually a bright annealed surface with high reflectivity. Building materials, kitchen utensils
NO.3 Rough lapping Grind with 100~200# (unit) strop tape Building materials, kitchen utensils
NO.4 Intermediate grinding Polished surface obtained by grinding with 150~180# strop abrasive tape Building materials, kitchen utensils
NO.240 Fine lapping Grinding with 240# strop abrasive tape kitchenware
NO.320 Very fine grinding Grinding was carried out with 320# strop abrasive tape kitchenware
NO.400 The luster is close to BA Use 400# polishing wheel to grind General timber, building timber, kitchen appliances
HL Hairline grinding Suitable particle material for hair stripe grinding (150~240#) with many grains Building, construction material
NO.7 It's close to mirror grinding Use a 600# rotary polishing wheel to grind For art or decoration
NO.8 Mirror ultrafinish The mirror is ground with a polishing wheel Reflector, for decoration

◉ PRODUCTION AND WAREHOUSING

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