ASTM A789 UNS S32750 Duplex Seamless Heat Exchanger Tube
UNS Grade: S32750
Common Name: Super Duplex Stainless Steel 2507 / SAF 2507
Form: Seamless Pipe/Tube
Outer Diameter Range: 6 – 610 mm (1/2" – 24")
Wall Thickness: 1 – 50 mm
Length: Fixed lengths, multiple lengths, or random lengths (up to 12 m)
Pipe Ends: Plain end, beveled end, or threaded
Sample: Available
Transport Package: Standard Seaworthy Packing
Are you looking for heat exchanger tubing that can withstand high chloride concentrations and erosive process media? If 316L or standard 2205 duplex stainless steel fails prematurely under your operating conditions, causing pitting corrosion, crevice corrosion, stress corrosion cracking, and unplanned heat exchanger shutdowns, ASTM A789 UNS S32750 (Alloy 2507) Super Duplex Stainless Steel Seamless Heat Exchanger Tubes offer a reliable engineering solution for demanding heat transfer systems.
ASTM A789 UNS S32750 seamless super duplex stainless steel tubes offer a Pitting Resistance Equivalent Number (PREN) above 42 and a minimum yield strength of approximately 550 MPa-around twice that of TP316L and approximately 25% higher than standard UNS S32205 duplex stainless steel pipe. This higher strength may allow heat exchanger designers to use thinner tube walls, subject to engineering verification, reducing the overall weight of tube bundles and potentially lowering long-term structural costs without compromising pressure integrity or safety margins.
ASTM A789 UNS S32750 heat exchanger tubes provide excellent resistance to chloride-induced stress corrosion cracking, pitting corrosion, and crevice corrosion. In comparison, TP316L heat exchangers operating in high-chloride, high-temperature environments may experience premature corrosion failure, sometimes within 2–5 years, depending on actual service conditions. Compared with S32205, UNS S32750 generally offers a higher critical pitting temperature, making it better suited to elevated seawater temperatures and certain environments involving higher hydrogen sulfide (H₂S) partial pressures, subject to applicable service requirements.
It is important to note that UNS S32750 is generally not recommended for prolonged service above approximately 300°C, as prolonged exposure to elevated temperatures can promote detrimental phase formation and embrittlement, including the 475°C embrittlement phenomenon. This is a critical design limit that we emphasize during technical reviews.
We supply ASTM A789 seamless heat exchanger tubes in a range of sizes, with outside diameters from 12.7 mm to 50.8 mm and wall thicknesses from 1.2 mm to 6.0 mm. Products can be specified with solution annealing and controlled ferrite-austenite phase balance, typically targeting 45%–55% ferrite, subject to the agreed technical requirements and applicable standards. Deliveries can include EN 10204 3.1 material test certificates (MTCs), heat-number traceability, and relevant documentation for NACE MR0175/ISO 15156 compliance when required and verified for the intended service conditions.
ASTM A789 Tube Specification
Chemical Composition (wt. %)
| Element | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
| Max/Range | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 | 0.50 max |
Mechanical Properties (Annealed)
| Property | Value |
| Tensile Strength (min) | 800 MPa (116 ksi) |
| Yield Strength (min) | 550 MPa (80 ksi) |
| Elongation in 50 mm (min) | 15 % |
| Hardness (max) | 310 HB / 32 HRC |
| Annealing Range | 1025 – 1125 °C |
Physical Properties
| Property | Value |
| Density | 7.8 g/cm³ (7810 kg/m³) |
| Melting Range | 1350 – 1450 °C |
| Thermal Conductivity | 15 – 18 W/(m·K) |
| Specific Heat | 475 – 500 J/(kg·K) |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Thermal Expansion | 13 × 10⁻⁶ /°C |
| Electrical Resistivity | 0.80 µΩ·m |
| Max Service Temperature | 300 °C |
ASTM A789 Dimensional Tolerances
| OD Range (in. [mm]) | OD Tolerance (in. [mm]) | Avg. Wall Tolerance (%) | Min Wall Over Spec (%) | Min Wall Under Spec (%) | Cut Length Over (in. [mm]) | Cut Length Under (in. [mm]) |
| Up to 1/2" [12.7] | ±0.005 [0.13] | ±15 | 30 | 0 | 1/8 [3] | 0 |
| 1/2" to 1½" [12.7–38.1] | ±0.005 [0.13] | ±10 | 20 | 0 | 1/8 [3] | 0 |
| 1½" to 3½" [38.1–88.9] | ±0.010 [0.25] | ±10 | 20 | 0 | 3/16 [5] | 0 |
| 3½" to 5½" [88.9–139.7] | ±0.015 [0.38] | ±10 | 20 | 0 | 3/16 [5] | 0 |
| 5½" to 8" [139.7–203.2] | ±0.030 [0.76] | ±10 | 20 | 0 | 3/16 [5] | 0 |
Thin-walled tube note: For wall < 0.065 in. [1.6 mm] (OD ≤ 1½"), < 0.095 in. [2.4 mm] (OD ≤ 3½"), or < 0.150 in. [3.8 mm] (OD > 3½"), the minimum wall tolerance applies.
Equivalent Grades
| System | Designation |
| UNS | S32750 |
| EN / WNR | 1.4410 (X2CrNiMoN25-7-4) |
| ASTM (pipe) | A790 F53 |
| AFNOR | Z3 CN 25.06 Az |
| Common name | 2507 / SAF 2507 |
HS Code for ASTM A789 UNS S32750 Seamless Tube
| HS Code | Description | Applicable When |
| 7304.41 | Other tubes, pipes and hollow profiles, of circular cross-section, of stainless steel, seamless, cold-drawn or cold-rolled | Tube is cold-drawn or cold-rolled after seamless forming |
| 7304.49 | Other tubes, pipes and hollow profiles, of circular cross-section, of stainless steel, seamless, other | Tube is hot-rolled seamless (not further cold worked) |
Pipe End Beveling
GNEE offers pre-processing services for pipe ends to meet specific installation and manufacturing requirements. Depending on pipe dimensions and processing capabilities, available pipe end configurations include plain ends, deburred ends, and beveled ends tailored for specific welding processes.
Delivery Time
GNEE supplies ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Heat Exchanger Tubes for demanding industrial applications. For available-stock orders, delivery may take approximately 7–15 days, while custom production typically requires 30–45 days, subject to tube dimensions, order quantity, heat treatment, and inspection requirements. The confirmed lead time will be provided after technical specifications and production schedules are reviewed.
ASTM A789 UNS S32750 Duplex Tube Price
The price of ASTM A789 UNS S32750 (super duplex 2507) stainless steel pipe varies significantly depending on dimensions, order quantity, and type (seamless or welded). For smaller specifications, prices typically range from $1.25 to over $22.30 per meter (or per foot), while in the wholesale market, prices can range from $1,000 to over $5,000 per metric ton.
If you could provide the following information:
• Exact outside diameter (OD) and wall thickness or pipe schedule
• Whether you require seamless or welded pipe
• Intended purchase quantity and delivery location
I will be able to provide you with a more accurate quote.
Inspection and Testing
Each order can be inspected according to ASTM A789/A789M and agreed project requirements. Testing may include chemical composition analysis, tensile testing, hardness testing, dimensional inspection, hydrostatic testing or approved nondestructive testing, and ferrite-phase verification where specified. EN 10204 3.1 material test certificates (MTCs) and heat-number traceability can be provided. Additional PMI and third-party inspection by SGS, BV, or TÜV can be arranged upon request.
Packaging
ASTM A789 UNS S32750 seamless heat exchanger tubes are packaged to minimize surface damage, contamination, and moisture exposure during storage and international transportation. Standard export packaging may include plastic end caps, protective wrapping, steel-strapped bundles, and waterproof outer covering. Wooden cases or reinforced packaging can be arranged for long-distance shipments and specific handling requirements. Tube identification, grade markings, and packing lists can support quantity verification and material traceability upon receipt.
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