Duplex
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Duplex Steel
The basic concept of duplex stainless steel is to produce a chemical composition that creates an equal mix of austenite and ferrite. This balance of phases provides the following: Higher strength – The range of 0.2% PS for the current duplex grades is from 400 – 550 MPa.
| Grade | UNS Number | Composition (%) | Density (g/cm³) | Melting Point (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Applications |
|---|---|---|---|---|---|---|---|---|
| Duplex 2205 | S32205 | Cr 22-23, Ni 4.5-6.5, Mo 2.5-3.5, N 0.14-0.20, Fe balance, C ≤ 0.03 | 7.8 | 1420-1460 | 620-850 | 450-550 | 25-30 | Chemical processing, oil and gas, marine environments, heat exchangers, pressure vessels |
| Duplex 2304 | S32304 | Cr 21.5-24.5, Ni 3-5.5, Mo ≤ 0.6, N 0.05-0.20, Fe balance, C ≤ 0.03 | 7.8 | 1420-1460 | 620-760 | 400-500 | 25-30 | Pulp and paper industry, structural applications, storage tanks, water treatment |
| Duplex 2101 | S32101 | Cr 21-22, Ni 1.35-1.70, Mn 4-6, Mo ≤ 0.8, N 0.20-0.25, Fe balance, C ≤ 0.04 | 7.8 | 1420-1460 | 600-800 | 450-550 | 30-35 | Chemical processing, water treatment, food processing, pulp and paper industry |
| Duplex 2507 | S32750 | Cr 24-26, Ni 6-8, Mo 3-5, N 0.24-0.32, Fe balance, C ≤ 0.03 | 7.8 | 1350-1400 | 800-1000 | 550-800 | 15-25 | Offshore oil and gas, chemical processing, marine environments, desalination plants |
| Duplex 2707 | S32707 | Cr 27-28, Ni 6-8, Mo 4.5-5.5, N 0.30-0.35, Fe balance, C ≤ 0.03 | 7.8 | 1350-1400 | 900-1100 | 600-800 | 15-25 | Oil and gas industry, chemical processing, marine applications, heat exchangers |
| Duplex 2202 | S32202 | Cr 22-23, Ni 1-1.4, Mn 3.5-5.5, Mo 0.2-0.6, N 0.15-0.25, Fe balance, C ≤ 0.03 | 7.8 | 1400-1450 | 620-780 | 450-550 | 25-30 | Storage tanks, bridges, pressure vessels, structural applications |
The Duplex Tube Fittings are renowned for their dual microstructure phase. The microstructure of DSS Bulkhead Tube Fittings is an equivalent 50 % each austenite and ferrite. Therefore the Duplex Steel Instrument Tube Fittings share characteristics of both steel classes.
| EN Number | Alloy Designation | Composition (%) | Density (g/cm³) | Melting Point (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Applications |
|---|---|---|---|---|---|---|---|---|
| EN 1.4462 | X2CrNiMoN22-5-3 | C ≤ 0.03, Cr 21.0-23.0, Ni 4.5-6.5, Mo 2.5-3.5, N 0.08-0.20 | 7.80 | 1400-1450 | 650-950 | 450-600 | 20-25 | Chemical processing, marine environments |
| EN 1.4410 | X4CrNiMo16-5-1 | C ≤ 0.03, Cr 24.0-26.0, Ni 6.0-8.0, Mo 4.0-5.0, N 0.20-0.30 | 7.80 | 1450-1500 | 800-1000 | 600-800 | 15-20 | Oil and gas, chemical processing, heat exchangers |
| EN 1.4501 | X2CrNiMoCuWN25-7-4 | C ≤ 0.03, Cr 24.0-26.0, Ni 7.0-9.0, Mo 4.0-5.0, Cu 0.5-1.0, W 0.8-1.2, N 0.20-0.30 | 7.80 | 1450-1500 | 800-1000 | 600-800 | 15-20 | Chemical processing, petrochemical, marine environments |
| EN 1.4417 | X3CrNiMo13-4 | C ≤ 0.03, Cr 23.0-26.0, Ni 5.0-7.0, Mo 1.5-2.5, N ≤ 0.20 | 7.80 | 1400-1450 | 650-950 | 450-600 | 20-25 | Chemical processing, marine environments |
Duplex steel plates are flat, broad sheets of material that find applications in structural and industrial projects. Their high strength and corrosion resistance make them valuable for constructing pressure vessels, storage tanks, and various structural components.