Duplex Steel S31803 / S32205 Forged Valves
Duplex Steel S31803 / S32205 Forged Valves Specification
| Specification | Details |
|---|---|
| Material | Duplex Stainless Steel S31803 / S32205 (F51 / F60) |
| Type | Forged Valve (Ball, Gate, Globe, Check, etc.) |
| Pressure Rating | ANSI 150, 300, 600, 900, 1500, 2500 (depending on size and design) |
| Size Range | 1/4" to 4" (varies by valve type and pressure class) |
| Temperature Range | -50°F to 600°F (-46°C to 316°C) |
| End Connections | Flanged (RF, FF), Threaded, Socket Weld, Butt Weld |
| Face-to-Face Dimension | As per ANSI B16.10 (varies by valve type) |
| Flange Rating | ANSI B16.5, DIN, JIS (depending on application) |
| Face-to-Face Length | As per ASME B16.10 (standard face-to-face dimensions) |
| Testing Standards | API 598, ISO 5208, ASME B16.34 |
| Leakage Class | Class IV or Class VI (depending on valve type) |
| Flow Coefficient (Cv Value) | Varies by size and type of valve |
| Body Material | Duplex Stainless Steel (S31803 / S32205) |
| Seat Material | PTFE, PEEK, or other elastomers (depending on valve type) |
| Bonnet Material | Duplex Stainless Steel (S31803 / S32205) |
| Stem Material | Duplex Stainless Steel or Stainless Steel 316L |
| Design Standard | ASME B16.34, API 602, ISO 9001 |
| Pressure Test | 1.5 times the working pressure or as per manufacturer |
| Corrosion Resistance | Excellent, highly resistant to pitting and crevice corrosion in chloride-rich environments |
| Applications | Chemical, petrochemical, oil & gas, marine, pulp & paper, water treatment, power plants |
| Certification | CE, UL, ISO 9001, PED (if required) |
| Material Composition | – S31803 (Duplex): ~22% Chromium, 3% Molybdenum, 5% Nickel, balance Iron – S32205 (Super Duplex): ~25% Chromium, 4% Molybdenum, 7% Nickel, balance Iron |
| Mechanical Properties | – Tensile Strength: 80-90 ksi (550-620 MPa) – Yield Strength: 50-70 ksi (340-480 MPa) – Hardness: 290-320 HB |
| Welding | Compatible with common welding processes (TIG, MIG) |
| Surface Finish | Typically Ra 3.2 µm to 6.3 µm (depending on application) |
| Resistance to Stress Corrosion Cracking (SCC) | Excellent, suitable for chloride-rich environments |
| Fatigue Strength | Excellent, making it ideal for dynamic or cyclic loading applications |
Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex 2205 | 1.4462 | S31803 / S32205 |
Chemical Properties
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex Steel S31803 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| Duplex Steel S32205 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
