ASTM A789 S32500 Duplex Stainless Steel Pipe
ASTM A789 S32500 Duplex Stainless Steel Pipe Material Data and Equivalents
Comprehensive material data for ASTM A789 S32500 duplex stainless steel pipe, including chemical composition, mechanical properties, physical properties, international equivalents, and application guide.
Cold drawn, hot rolled, welded, solution annealed, pickled
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
ASTM A789 S32500 Duplex Stainless Steel Pipe Introduction
ASTM A789 S32500 is a high-strength, corrosion-resistant duplex stainless steel pipe designed for general service tubing. This grade combines a ferritic-austenitic microstructure to deliver excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. With 24–26% chromium, 5.5–7.5% nickel, 2.9–3.9% molybdenum, and controlled nitrogen and copper additions, it offers superior mechanical properties compared to standard austenitic grades, including a minimum yield strength of 860 MPa (125 ksi) and tensile strength over 1160 MPa (168 ksi). S32500 is supplied under ASTM A789/A789M in seamless or welded condition, solution annealed to optimize phase balance. It is widely used in aggressive environments such as offshore oil & gas, chemical processing, and marine heat exchangers, where both high strength and corrosion resistance are critical.
ASTM A789 S32500 Duplex Stainless Steel Pipe Chemical Composition
The chemical requirements for S32500 (UNS S32500) according to ASTM A789/A789M are listed below. All elements are reported as mass fraction. The alloy relies on high chromium, molybdenum, nitrogen, and copper for exceptional pitting resistance and mechanical strength.
| Chemical Element | Standard Value (weight %) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.030 | Max |
| Manganese (Mn) | ≤2.00 | Max |
| Silicon (Si) | ≤1.00 | Max |
| Phosphorus (P) | ≤0.030 | Max |
| Sulfur (S) | ≤0.020 | Max |
| Chromium (Cr) | 24.0 – 26.0 | Range |
| Nickel (Ni) | 5.5 – 7.5 | Range |
| Molybdenum (Mo) | 2.9 – 3.9 | Range |
| Nitrogen (N) | 0.10 – 0.25 | Range |
| Copper (Cu) | 1.5 – 2.5 | Range |
ASTM A789 S32500 Duplex Stainless Steel Pipe Thermal and Electrical Physical Properties
These physical properties are typical for S32500 duplex stainless steel (e.g., EN 1.4507 equivalent) and are provided as reference engineering data. Properties can vary slightly with processing and temperature.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.30 | – | 20°C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20 – 100°C |
| Thermal Expansion Coefficient (α) | 13.6 | 10⁻⁶/K | 20 – 200°C |
| Thermal Expansion Coefficient (α) | 14.2 | 10⁻⁶/K | 20 – 300°C |
| Thermal Conductivity (λ) | 15 | W/(m·K) | 20°C |
| Thermal Conductivity (λ) | 16 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 18 | W/(m·K) | 200°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρₑ) | 0.80 | µΩ·m | 20°C |
ASTM A789 S32500 Duplex Stainless Steel Pipe Mechanical Properties
The following mechanical properties apply to tubing in the solution annealed condition at room temperature, as specified by ASTM A789/A789M. The duplex structure guarantees high yield strength and good ductility, making it suitable for high-pressure service.
| Performance Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥1160 | MPa (168 ksi) | Room temperature, solution annealed |
| Yield Strength (Rp0.2) | ≥860 | MPa (125 ksi) | Room temperature, solution annealed |
| Elongation (A) | ≥15 | % | Gauge length 50 mm (2 in.), solution annealed |
| Hardness | ≤33 | HRC | As solution annealed (Rockwell C) |
ASTM A789 S32500 Duplex Stainless Steel Pipe Complete Equivalent Material Standards & Replacement Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A789/A789M | S32500 (UNS S32500) | Base grade – seamless/welded tubing |
| China | GB/T 20878-2007 | S22553 (022Cr25Ni6Mo3Cu2N) | Direct equivalent, matching composition and applications |
| Europe | EN 10088-3 | 1.4507 (X2CrNiMoCuN25-6-3) | Closest European grade; composition ranges overlap, widely accepted interchangeable |
ASTM A789 S32500 Duplex Stainless Steel Pipe Application Introduction
S32500 duplex stainless steel pipe combines high mechanical strength with excellent corrosion resistance, enabling reliable service in demanding environments. It is particularly suited for mediums containing chlorides, sour gases, and organic acids. Typical applications and products include:
Product Applications: Seamless and welded stainless steel pipes, Heat exchanger tubes, Umbilical tubing, Process piping systems, Flanges, fittings, and valves, Structural hollow sections
Processed into products: Heat exchanger tube bundles, Chemical injection lines, Subsea flowlines and risers, Pressure vessel nozzles, Seawater lift pipes, Desalination brine heater tubes
Application industries: Oil & Gas (offshore topside, subsea piping, production tubing), Chemical Process Industry (reactors, heat exchangers, piping), Marine & Shipbuilding (seawater cooling systems, ballast systems), Desalination (RO high-pressure piping, evaporators), Pulp & Paper (digesters, bleaching equipment), Power Generation (condenser tubes, heat recovery steam generators)
ASTM A789 S32500 Duplex Stainless Steel Pipe Similar/Alternative Stainless Steel Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A789/A789M | S32520 (UNS S32520) | 25Cr duplex with higher N and Mo (3.0-5.0% Mo); enhanced pitting resistance (PREN ≥40) |
| USA | ASTM A789/A789M | S32750 (UNS S32750) – Super duplex 2507 | Higher Mo (3.0-5.0%) and N; superior chloride SCC and pitting resistance, used in more aggressive environments |
| USA | ASTM A789/A789M | S32760 (UNS S32760) – Zeron 100 | Contains W and Cu, very high PREN; excellent resistance to H₂S and seawater |
| USA | ASTM A789/A789M | S32205 (UNS S32205) – Duplex 2205 | Lower alloyed (22% Cr, 3% Mo, no Cu); economical alternative for moderate corrosion duties |
Notes:
Welding: Use matching filler metals (e.g., ER2594 or similar superduplex over-alloyed fillers) to maintain corrosion resistance and phase balance. Post-weld heat treatment is typically not required for thin sections. Temperature limits: Generally suitable for continuous service between -50°C and 300°C, but long-term exposure above 300°C may cause alpha prime embrittlement. Corrosion: Critical pitting temperature (CPT) in 6% FeCl₃ is typically >50°C, and PREN = %Cr + 3.3×%Mo + 16×%N ≈ 35–42, ensuring excellent resistance in chloride-bearing environments.
- Share
