ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe: Properties, Equivalents & Applications
Comprehensive technical data for ASTM A789 UNS S39277 super duplex stainless steel pipe, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot working, cold working, welding, machining, solution annealing and quenching
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ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Introduction
ASTM A789 UNS S39277 is a super duplex stainless steel designed for seamless and welded pipes in general corrosive service. It combines high strength with exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-containing environments. The microstructure consists of approximately equal amounts of austenite and ferrite. Typical trade names include Zeron 100. This grade is characterized by:
- High chromium (24-26%) and molybdenum (3.5-4.5%) content for superior pitting resistance (PREN ≥40)
- Tungsten (0.5-1.0%) and copper (1.0-2.5%) additions to enhance corrosion resistance and mechanical strength
- Controlled nitrogen (0.24-0.32%) for improved weldability and balancing the phase ratio
- Excellent mechanical properties with yield strength above 620 MPa in solution-annealed condition
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Chemical Composition
Chemical requirements according to ASTM A789/A789M for UNS S39277. All values are maximum unless a range is indicated. Iron is the balance.
- Chromium, molybdenum, and nitrogen provide excellent resistance to localized corrosion.
- Tungsten and copper enhance corrosion resistance in reducing acids and increase strength.
| Element | Specified Value | Remark |
|---|---|---|
| Carbon (C) | ≤0.025 | |
| Manganese (Mn) | ≤1.20 | |
| Phosphorus (P) | ≤0.025 | |
| Sulfur (S) | ≤0.010 | |
| Silicon (Si) | ≤0.80 | |
| Chromium (Cr) | 24.0 – 26.0 | |
| Nickel (Ni) | 6.0 – 8.0 | |
| Molybdenum (Mo) | 3.5 – 4.5 | |
| Nitrogen (N) | 0.24 – 0.32 | |
| Copper (Cu) | 1.0 – 2.5 | |
| Tungsten (W) | 0.5 – 1.0 | |
| Iron (Fe) | Balance |
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Thermal and Electrical Physical Properties
Physical properties representative of super duplex stainless steel UNS S39277 in annealed condition. These values are for general engineering reference. Note: Slight variations may occur depending on product form and specific heat treatment.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 200 | GPa | At 20°C |
| Shear Modulus (G) | 77 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.30 | – | At 20°C |
| Thermal Expansion Coefficient (α) | 13.0 | µm/m·°C | 20°C – 100°C |
| Thermal Expansion Coefficient (α) | 13.5 | µm/m·°C | 20°C – 200°C |
| Thermal Expansion Coefficient (α) | 14.0 | µm/m·°C | 20°C – 400°C |
| Thermal Conductivity (λ) | 15 | W/m·K | At 20°C |
| Thermal Conductivity (λ) | 17 | W/m·K | At 100°C |
| Thermal Conductivity (λ) | 20 | W/m·K | At 300°C |
| Specific Heat Capacity | 500 | J/kg·K | At 20°C |
| Electrical Resistivity (ρ_e) | 0.80 | µΩ·m | At 20°C |
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Mechanical Properties
Minimum mechanical properties at room temperature per ASTM A789 for UNS S39277. Note: Values are applicable for wall thickness up to approximately 25 mm; thicker sections may require reduced strength values. Test pieces are taken in longitudinal direction.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥800 | MPa | Room temperature, ASTM E8/E8M |
| Yield Strength (ReH, 0.2% offset) | ≥620 | MPa | Room temperature, ASTM E8/E8M |
| Elongation (A, 50 mm or 4D) | ≥25 | % | Room temperature, gauge length 50 mm (2 in.) |
| Hardness (Rockwell C) | ≤32 | HRC | ASTM E18 |
| Impact Energy (KV, longitudinal) | ≥80 (typical) | J | At -46°C, Charpy V-notch, ASTM E23 |
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Fully Equivalent Material Standards and Substitute Designations
| Country / Region | Standard / Specification | Grade / Designation | Note |
|---|---|---|---|
| USA | ASTM A789/A789M, ASTM A790/A790M, ASME SA789, ASME SA790 | UNS S39277 | Base grade for this analysis; seamless/welded pipe and tube |
| Europe (EU) | EN 10216-5, EN 10217-7 | 1.4501 – X2CrNiMoCuWN25-7-4 | Chemically equivalent super duplex stainless steel for pressure purposes |
| International (ISO) | ISO 15510 | X2CrNiMoCuWN25-7-4 (4501-25-7-4) | International designation corresponding to S39277 / 1.4501 |
| UK | BS EN 10216-5 | 1.4501 | Adopted European standard |
| Germany | SEW 400, DIN EN 10216-5 | 1.4501 | Same as EN designation |
| China | GB/T 21833, GB/T 24593 | 022Cr25Ni7Mo4WCuN (similar to S39277) | Chinese super duplex grade; check exact composition for full equivalence |
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Application Introduction
UNS S39277 super duplex stainless steel pipe is selected when high mechanical strength and outstanding resistance to chlorine-induced corrosion are required. It is widely used in aggressive environments such as seawater, brine, sour gas, and chemical processing media. The alloy can withstand operating temperatures from -50°C to 300°C and is resistant to chloride stress corrosion cracking up to approximately 150°C. Typical applications are listed below.
Product Applications: Seamless and welded pipes for process lines and gathering systems, Heat exchanger tubes and condensers, Hydraulic and instrumentation tubing, Umbilical tubes for subsea control systems, High-pressure duplex fittings and flanges, Shell-and-tube heat exchangers
Processed into products: Subsea flowline pipe sections and bends, Tube bundles for seawater-cooled exchangers, Chemical injection lines, Wellhead components and Christmas tree tubing, Desalination brine heater tubes, Pump shafts and sleeves, Swaged fittings and compression adapters, Welded pipe manifolds
Application industries: Oil & Gas (offshore platforms, subsea manifolds, process piping, umbilical tubing), Chemical and Petrochemical (heat exchangers, condensers, piping for aggressive fluids), Seawater Handling (desalination plants, fire fighting systems, cooling water systems), Pulp & Paper (digesters, bleach plants), Marine Engineering (propeller shafts, seawater pumps, valves), Pollution Control (FGD scrubbers, waste incineration)
ASTM A789 UNS S39277 Super Duplex Stainless Steel Pipe Closely Related Alternative Grades
| Country / Region | Standard / Specification | Grade / Designation | Comparison / Remarks |
|---|---|---|---|
| USA | ASTM A789, ASTM A790 | UNS S32750 (2507) | Super duplex without tungsten; slightly lower PREN but still excellent corrosion resistance. Yield strength similar. |
| USA | ASTM A789, ASTM A790 | UNS S32760 (Zeron 100 variant) | Contains tungsten and copper, composition very close to S39277; often considered a true equivalent. Check ASTM A789 for S32760 requirements. |
| EU | EN 10216-5 | 1.4410 – X2CrNiMoN25-7-4 (S32750) | Super duplex without tungsten and copper; PREN ~41; used for similar applications. |
| EU | EN 10216-5 | 1.4507 – X2CrNiMoCuN25-6-3 | Standard duplex (2205) with higher strength; lower corrosion resistance than S39277. |
| Japan | JIS G3459, JIS G3463 | SUS329J4L (S32750 equivalent) | Super duplex grade, no tungsten. |
Notes:
This data is extracted from ASTM A789/A789M standard specification for ferritic/austenitic stainless steel tubing. Several important considerations:
- Welding must be performed with matching filler metals (e.g., ER2594) and with controlled heat input to maintain the desired phase balance.
- For sour service (NACE MR0175/ISO 15156), UNS S39277 may require specific hardness limits and testing; verify project requirements.
- The maximum service temperature in air is about 300°C; prolonged exposure at 280°C–500°C can cause 475°C embrittlement.
- Actual mechanical properties may be influenced by section size and manufacturing method. Thick-walled pipe may have lower strength requirements per ASTM A790.
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