ASTM A789 S32750 Super Duplex Stainless Steel Pipe
ASTM A789 S32750 Super Duplex Stainless Steel Pipe | Ultimate Corrosion Resistance & High Strength
Discover premium ASTM A789 S32750 super duplex stainless steel pipe with exceptional pitting and stress corrosion cracking resistance, high mechanical strength, and excellent weldability for demanding marine, chemical, and oil & gas environments.
Seamless cold-drawn, welded and cold-worked, tube solution annealed, and pickled or bright annealed
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ASTM A789 S32750 Super Duplex Stainless Steel Pipe Introduction
ASTM A789 S32750 is a super duplex stainless steel characterized by a balanced ferritic-austenitic microstructure (approximately 50% each). This grade combines high mechanical strength with outstanding resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion in harsh environments. The high chromium, molybdenum, and nitrogen content ensures a Pitting Resistance Equivalent Number (PREN) exceeding 40, making it suitable for seawater, sour gas, and chemical processing applications. It offers significantly higher yield strength compared to standard austenitic and duplex grades, enabling weight reduction and cost savings in piping systems. The material is readily weldable following appropriate procedures and filler metals, and it exhibits good toughness down to moderate sub-zero temperatures. Its enhanced corrosion resistance extends service life in aggressive media, including dilute acids, oxidizing chlorides, and hydrogen sulfide environments compliant with NACE MR0175.
ASTM A789 S32750 Super Duplex Stainless Steel Pipe Chemical Composition
Chemical composition in accordance with ASTM A789/A789M for UNS S32750. All values are maximum unless a range is indicated. Iron constitutes the balance.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤0.030 | |
| Si | ≤0.80 | |
| Mn | ≤1.20 | |
| P | ≤0.035 | |
| S | ≤0.020 | |
| Cr | 24.0 - 26.0 | |
| Ni | 6.0 - 8.0 | |
| Mo | 3.0 - 5.0 | |
| N | 0.24 - 0.32 | |
| Cu | ≤0.50 | |
| Fe | Balance |
ASTM A789 S32750 Super Duplex Stainless Steel Pipe Thermal and Electrical Physical Properties
Representative physical properties for UNS S32750 super duplex stainless steel in the solution annealed condition. Values are typical and may vary with product form and temperature. Data sources: published literature and industrial references.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | — | 20°C |
| Coefficient of Thermal Expansion (α) | 13.0 × 10⁻⁶ /K | 10⁻⁶ /K | 20 - 100 °C |
| Coefficient of Thermal Expansion (α) | 13.5 × 10⁻⁶ /K | 10⁻⁶ /K | 20 - 200 °C |
| Coefficient of Thermal Expansion (α) | 14.0 × 10⁻⁶ /K | 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 S32750 Super Duplex Stainless Steel Pipe Mechanical Properties
Tensile and hardness requirements for solution annealed tubing at room temperature per ASTM A789. Testing is conducted in accordance with ASTM A370.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥800 | MPa | Room temperature, longitudinal |
| Yield Strength (0.2% offset, ReH) | ≥550 | MPa | Room temperature |
| Elongation (A in 2 in. or 50mm) | ≥15 | % | Gauge length 50 mm |
| Hardness, Brinell | ≤310 | HBW | As per ASTM E10 |
| Hardness, Rockwell C | ≤32 | HRC | As per ASTM E18 |
ASTM A789 S32750 Super Duplex Stainless Steel Pipe Exact Equivalent Material Standards & Replaceable Grades
| Country / Region | Standard | Designation / Grade | Remarks |
|---|---|---|---|
| USA | ASTM A789/A789M | UNS S32750 | Seamless and welded tubing, super duplex |
| Europe | EN 10216-5 | 1.4410 (X2CrNiMoN25-7-4) | Seamless tube for pressure purposes |
| China | GB/T 21833 | 022Cr25Ni7Mo4N | Super duplex stainless steel seamless tube |
| International | ISO 17781 | UNS S32750 / 1.4410 | Petroleum, petrochemical and natural gas industries |
ASTM A789 S32750 Super Duplex Stainless Steel Pipe Application Introduction
ASTM A789 S32750 super duplex stainless steel pipe is engineered for severe service conditions where standard stainless steels fail. Its exceptional resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion, combined with high mechanical strength, makes it a preferred choice in aggressive media.
- Excellent performance in seawater and brine systems up to moderate temperatures.
- Sour service compliant per NACE MR0175 / ISO 15156 for H₂S-containing oil & gas environments.
- High fatigue strength and erosion-corrosion resistance beneficial for dynamic applications.
Product Applications: Seamless tubes and pipes for heat exchangers and condensers, Welded and drawn tubes for instrumentation and hydraulic systems, Subsea umbilical tubes, High-pressure line pipes for corrosive oil and gas service
Processed into products: Tube sheets and baffles, Flanges, elbows, and reducers, Valve bodies and trim, Welded nozzles and manifolds, Compression fittings and connectors
Application industries: Oil & Gas (subsea umbilical tubing, downhole production tubing, hydraulic lines), Chemical and Petrochemical Processing (heat exchanger tubes, pressure piping), Desalination Plants (reverse osmosis high-pressure piping, brine heater tubes), Marine Engineering (seawater cooling and firewater systems), Pulp & Paper (bleach plant washers, digester heat exchangers), Power Generation (condenser and feedwater heater tubes in nuclear and fossil plants)
ASTM A789 S32750 Super Duplex Stainless Steel Pipe Comparable / Near-Equivalent Alternative Materials
| Country / Region | Standard | Designation / Grade | Remarks (Similarity & Differences) |
|---|---|---|---|
| USA / Europe | ASTM A789 / EN 10216-5 | S32760 (UNS S32760 / 1.4501) | Zeron 100 type. Contains tungsten for higher pitting resistance; strength comparable to S32750. |
| USA | ASTM A789 | S32550 (UNS S32550) | Ferralium 255. Higher copper alloy for sulfuric acid resistance; slightly lower yield strength than S32750. |
| USA / Europe | ASTM A790 / EN 10216-5 | S32205 (UNS S32205 / 1.4462) | Standard duplex 2205. Lower strength and PREN; economical alternative for less aggressive environments. |
Notes:
The material can typically be supplied in compliance with supplementary requirements such as NH (non-destructive testing), UT (ultrasonic inspection), and PMI (positive material identification). Solution annealing is performed at 1020–1100 °C followed by rapid water quenching to avoid detrimental phase precipitation. Welding should use matching filler metals (e.g., AWS A5.9 ER2594) and proper heat input control to maintain the ferrite/austenite balance and corrosion resistance. For sour service applications, compliance with NACE MR0175 is achievable under specific hardness and testing conditions listed in the standard.
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