ASTM A790 S32205 Duplex Stainless Steel Corrosion-Resistant Seamless Tubes for Marine Use
ASTM A790 S32205 Duplex Stainless Steel Corrosion-Resistant Seamless Tubes for Marine Use
Duplex stainless steel tubing conforming to ASTM A790 32205 is ideal for marine applications due to its high strength, excellent corrosion resistance, and resistance to chloride stress corrosion cracking. Its key properties include a yield strength of approximately 550 MPa (80,000 psi), a tensile strength of 800 MPa (116,000 psi), and a density of 7.8 g/cm³. ASTM A790 specifies its suitability for general corrosive environments and its applicability to a variety of marine applications, such as structural components, seawater systems, and propeller shafts.
What are the components of ASTM A790?
ASTM A790 UNS S32750 (duplex stainless steel 2507) is a super duplex stainless steel containing 25% chromium, 4% molybdenum, and 7% nickel. It is used to manufacture seamless and weldable ferritic/austenitic stainless steel tubes.
Heat Treatment Requirements for UNS S32205
| Parameter | Requirement |
| UNS Designation | S32205 |
| Type | 2205 |
| Temperature Range | 1870–2010 °F [1020–1100 °C] |
| Quenching Method | Rapid cooling in water or by other means |
Chemical Composition of UNS S32205
| Element | Requirement (%) | Notes |
| Carbon (C) | ≤0.030 | Controls carbide formation |
| Manganese (Mn) | ≤2.00 | Improves hot workability |
| Phosphorus (P) | ≤0.030 | Minimizes brittleness |
| Sulfur (S) | ≤0.030 | Enhances machinability |
| Silicon (Si) | ≤1.00 | Deoxidizer and strength enhancer |
| Nickel (Ni) | 4.5-6.5 | Austenite stabilizer |
| Chromium (Cr) | 22.0-23.0 | Primary corrosion resistance |
| Molybdenum (Mo) | 3.0-3.5 | Pitting resistance enhancer |
| Nitrogen (N) | 0.14-0.20 | Strength and corrosion resistance |
Tensile and Hardness Requirements for UNS S32205
| Property | Requirement | Unit |
| UNS Designation | S32205 | - |
| Type | 2205 | - |
| Tensile Strength, min | 95 [655] | ksi [MPa] |
| Yield Strength, min | 65 [450] | ksi [MPa] |
| Elongation in 2 in. or 50 mm, min | 25 | % |
| Hardness, max (HBW) | 290 | HBW |
| Hardness, max (HRC) | 30 | HRC |
Marine Applications:
Offshore platform structural components
Seawater systems
Propeller shafts
Seawater desalination equipment
Cargo tanks for corrosive chemicals in ships and trucks
General marine engineering facilities
Limitations and Precautions:
Temperature: S32205 has good high-temperature oxidation resistance, but embrittlement will occur if the temperature exceeds approximately 300 °C (572 °F). This condition can only be repaired by full solution annealing.
Welding: Conventional methods such as GTAW, GMAW, and SMAW can be used for welding, but proper welding procedures must be followed to maintain its properties.
Why Choose Gnee Steel (Supplier Example)?
✅ Large stock of 304/316 stainless steel strip/coil, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), Chemical Composition Certificate, and Mechanical Properties Certificate.
✅ Value-added services: Slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documentation.
Email: ru@gneesteelgroup.com
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com
