Super Duplex 2507 Pipes and Tubes (UNS S32750, 1.4410) are specified where chlorides, pressure and temperature combine to defeat 316L and 2205, for example reverse osmosis brine headers and warm seawater lines. The alloy contains around 25% Chromium, 7% Nickel and 4% Molybdenum meaning it has a PREN value greater than 40. This means that warm seawater will struggle to initiate pitting. The alloy also has great mechanical properties with a minimum yield of 550MPa and tensile strength of 800MPa (ASTM A790). Designers can therefore reduce wall thickness and line weight against 2205 or 316L. Metinox Overseas supplies seamless and welded 2507 super duplex stainless steel tubes, U-bent heat exchanger tubes and pipes and tubes for desalination, offshore and cooling water applications throughout the GCC.
Have a line list, datasheet or material requisition ready? Send it with the grade, OD, wall or schedule, length, quantity, minimum PREN, certification level and destination port. We will check your requirements against ASTM A790 and A789 before we quote.
Table of Contents
- Super Duplex 2507 Pipes and Tubes Specifications (ASTM A790 / A789)
- Types of Super Duplex 2507 Tubing and Pipe
- Chemical Composition of Super Duplex 2507 Seamless Tubing
- Alloy 2507 Super Duplex Equivalent Grades
- Physical Properties of UNS S32750
- Super Duplex 2507 Pipe Weight Chart (UNS S32750)
- Super Duplex 2507 Pipe Wall Thickness Chart (ASME B36.19M / B36.10M)
- Tube tolerances, ASTM A789 / A1016
- Where 2507 Super Duplex Stainless Steel Tubes and Pipes Are Used
- Delivery, Packing and Site Storage for Super Duplex Tubing
- Request a Quotation for Super Duplex 2507 Pipes and Tubes
- Complete the System: Super Duplex Fittings and Flanges
- Super Duplex Tube FAQ
Super Duplex 2507 Pipes and Tubes Specifications (ASTM A790 / A789)
| Parameter | Details |
|---|---|
| Specifications | ASTM A790 / ASME SA790 (pipe), ASTM A789 / ASME SA789 (tube) |
| General Requirements | ASTM A999 (pipe), ASTM A1016 (tube) |
| Dimensional Standards | ASME B36.19M, ASME B36.10M |
| Grades | Super Duplex 2507, UNS S32750 (for S32760 see our UNS S32760 tube |
| Seamless Pipes & Tubes Sizes | Welded pipe: 6" NB – 24" NB (OD 168.3 – 609.6 mm |
| Welded Pipes & Tubes Sizes | Welded Pipe: 6" NB – 24" NB | OD: 5mm – 1219.2mm Welded tube: OD 6.35 – 101.6 mm |
| Wall Thickness | 0.3mm – 50mm | SCH 5, SCH10, SCH40, SCH80, SCH120, SCH160, XXS |
| Types | Seamless, Welded, EFW (ASTM A928 for large diameter) |
| Form | Round pipe and tube, straight or U bent heat exchanger tube |
| End Types | Plain End, Bevelled End (ASME B16.25), Threaded |
| Length | Single Random, Double Random & Cut to Required Length |
| Delivery Condition | Solution Annealed and Pickled, Bright Annealed (tube) |
| Heat Treatment | Solution annealed 1025–1125 °C (1880–2060 °F), rapid water quench |
| Certification | EN 10204 3.1 mill test certificate as standard; 3.2 with third-party inspection on request |
Types of Super Duplex 2507 Tubing and Pipe
Super Duplex Seamless Tube
Cold drawn or pilgered to ASTM A789 for heat exchangers, instrumentation and hydraulic lines.
Super Duplex Welded Tube and Pipe
Longitudinally welded and solution annealed, used for larger diameters where seamless is uneconomic.
32750 Super Duplex Heat Exchanger Tube
Straight lengths to A789 / A1016 tolerances, eddy current tested.
SME SA789 S32750 U Tubes
U-bent to tube-sheet drawings, bends stress relieved where specified.
Super Duplex Boiler Tube
For feedwater heaters and economisers operating below 300 °C.
EFW Pipe (ASTM A928)
Large-diameter pipe for seawater intake, firewater and RO headers.
Chemical Composition of Super Duplex 2507 Seamless Tubing
Values are % by weight; single values are maximums. Fe = balance. PREN = %Cr + 3.3 × %Mo + 16 × %N ≥ 40.
| Element | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 6.0 to 8.0 | 24.0 to 26.0 | 3.0 to 5.0 | 0.24 to 0.32 | 0.50 |
Alloy 2507 Super Duplex Equivalent Grades
| Standard | Werkstoff Nr. | UNS | Specifications | AFNOR | EN | SS | JIS |
|---|---|---|---|---|---|---|---|
| Super Duplex 2507 | 1.4410 | S32750 | ASTM A789 / A790, ASME SA789 / SA790 | Z3 CND 25.06 Az | X2CrNiMoN25-7-4 | 2328 | SUS 329J4L (nearest) |
Physical Properties of UNS S32750
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Modulus of elasticity | 200 GPa |
| Thermal expansion (20–100 °C) | 13.0 µm/m·°C |
| Thermal conductivity | 14 W/m·K |
| Specific heat | 485 J/kg·K |
| Electrical resistivity | 0.80 µΩ·m |
Super Duplex 2507 Pipe Weight Chart (UNS S32750)
Weight (kg/m) = (OD − WT) × WT × 0.02450, using a density of 7.80 g/cm³.
| Pipe OD (mm) | Pipe WT (mm) | Nominal Size | Schedule | Weight (kg/m) |
|---|---|---|---|---|
| 21.3 | 2.11 | ½" | Sch 10S | 0.99 |
| 21.3 | 2.77 | ½" | Sch 40S | 1.26 |
| 26.7 | 2.11 | ¾" | Sch 10S | 1.27 |
| 26.7 | 2.87 | ¾" | Sch 40S | 1.68 |
| 33.4 | 1.65 | 1" | Sch 5S | 1.28 |
| 33.4 | 2.77 | 1" | Sch 10S | 2.08 |
| 33.4 | 3.38 | 1" | Sch 40S | 2.49 |
| 42.2 | 1.65 | 1¼" | Sch 5S | 1.64 |
| 42.2 | 2.77 | 1¼" | Sch 10S | 2.68 |
| 42.2 | 3.56 | 1¼" | Sch 40S | 3.37 |
| 48.3 | 1.65 | 1½" | Sch 5S | 1.89 |
| 48.3 | 2.77 | 1½" | Sch 10S | 3.09 |
| 48.3 | 3.68 | 1½" | Sch 40S | 4.02 |
| 60.3 | 1.65 | 2" | Sch 5S | 2.37 |
| 60.3 | 2.77 | 2" | Sch 10S | 3.90 |
| 60.3 | 3.91 | 2" | Sch 40S | 5.40 |
| 73.0 | 3.05 | 2½" | Sch 10S | 5.23 |
| 73.0 | 5.16 | 2½" | Sch 40S | 8.58 |
| 88.9 | 2.11 | 3" | Sch 5S | 4.49 |
| 88.9 | 3.05 | 3" | Sch 10S | 6.42 |
| 88.9 | 5.49 | 3" | Sch 40S | 11.22 |
| 101.6 | 3.05 | 3½" | Sch 10S | 7.37 |
| 114.3 | 2.11 | 4" | Sch 5S | 5.80 |
| 114.3 | 3.05 | 4" | Sch 10S | 8.31 |
| 114.3 | 6.02 | 4" | Sch 40S | 15.97 |
| 141.3 | 3.40 | 5" | Sch 10S | 11.49 |
| 141.3 | 6.55 | 5" | Sch 40S | 21.63 |
| 168.3 | 2.77 | 6" | Sch 5S | 11.24 |
| 168.3 | 3.40 | 6" | Sch 10S | 13.74 |
| 168.3 | 7.11 | 6" | Sch 40S | 28.08 |
| 219.1 | 2.77 | 8" | Sch 5S | 14.68 |
| 219.1 | 3.76 | 8" | Sch 10S | 19.84 |
| 219.1 | 8.18 | 8" | Sch 40S | 42.28 |
| 273.0 | 3.40 | 10" | Sch 5S | 22.46 |
| 273.0 | 4.19 | 10" | Sch 10S | 27.60 |
| 273.0 | 9.27 | 10" | Sch 40S | 59.91 |
| 323.8 | 3.96 | 12" | Sch 5S | 31.04 |
| 323.8 | 4.57 | 12" | Sch 10S | 35.75 |
| 323.8 | 9.53 | 12" | Sch 40S | 73.39 |
| 355.6 | 4.78 | 14" | Sch 10S | 41.09 |
| 355.6 | 9.53 | 14" | STD | 80.82 |
| 406.4 | 4.78 | 16" | Sch 10S | 47.04 |
| 406.4 | 9.53 | 16" | STD | 92.68 |
| 457.0 | 4.78 | 18" | Sch 10S | 52.97 |
| 508.0 | 5.54 | 20" | Sch 10S | 68.21 |
| 610.0 | 6.35 | 24" | Sch 10S | 93.93 |
Need a size or schedule not listed? Send OD, wall and quantity and we will confirm stock and price within one working day. Request a Quote
Super Duplex 2507 Pipe Wall Thickness Chart (ASME B36.19M / B36.10M)
| NPS | DN | OD mm (in) | Sch 10S / 10 | Sch 40S / 40 / STD | Sch 80S / 80 / XS | Sch 160 |
|---|---|---|---|---|---|---|
| ⅛ | 6 | 10.3 (0.405) | 1.24 (0.049) | 1.73 (0.068) | 2.41 (0.095) | - |
| ¼ | 8 | 13.7 (0.540) | 1.65 (0.065) | 2.24 (0.088) | 3.02 (0.119) | - |
| ⅜ | 10 | 17.1 (0.675) | 1.65 (0.065) | 2.31 (0.091) | 3.20 (0.126) | - |
| ½ | 15 | 21.3 (0.840) | 2.11 (0.083) | 2.77 (0.109) | 3.73 (0.147) | 4.78 (0.187) |
| ¾ | 20 | 26.7 (1.050) | 2.11 (0.083) | 2.87 (0.113) | 3.91 (0.154) | 5.56 (0.219) |
| 1 | 25 | 33.4 (1.315) | 2.77 (0.109) | 3.38 (0.133) | 4.55 (0.179) | 6.35 (0.250) |
| 1¼ | 32 | 42.2 (1.660) | 2.77 (0.109) | 3.56 (0.140) | 4.85 (0.191) | 6.35 (0.250) |
| 1½ | 40 | 48.3 (1.900) | 2.77 (0.109) | 3.68 (0.145) | 5.08 (0.200) | 7.14 (0.281) |
| 2 | 50 | 60.3 (2.375) | 2.77 (0.109) | 3.91 (0.154) | 5.54 (0.218) | 8.74 (0.344) |
| 2½ | 65 | 73.0 (2.875) | 3.05 (0.120) | 5.16 (0.203) | 7.01 (0.276) | 9.53 (0.375) |
| 3 | 80 | 88.9 (3.500) | 3.05 (0.120) | 5.49 (0.216) | 7.62 (0.300) | 11.13 (0.438) |
| 3½ | 90 | 101.6 (4.000) | 3.05 (0.120) | 5.74 (0.226) | 8.08 (0.318) | - |
| 4 | 100 | 114.3 (4.500) | 3.05 (0.120) | 6.02 (0.237) | 8.56 (0.337) | 13.49 (0.531) |
| 5 | 125 | 141.3 (5.563) | 3.40 (0.134) | 6.55 (0.258) | 9.53 (0.375) | 15.88 (0.625) |
| 6 | 150 | 168.3 (6.625) | 3.40 (0.134) | 7.11 (0.280) | 10.97 (0.432) | 18.26 (0.719) |
Tube tolerances, ASTM A789 / A1016
| OD range | OD tolerance |
|---|---|
| 63.5 to 76.2 mm (2.5 to 3 in) | ±0.30 mm (±0.012 in) |
| 76.2 to 101.6 mm (3 to 4 in) | ±0.38 mm (±0.015 in) |
| Wall thickness (seamless, min wall) | +20% / −0% (≤ 38.1 mm OD: +20% / −0%) |
| Wall thickness (welded, average wall) | ±10% |
Where 2507 Super Duplex Stainless Steel Tubes and Pipes Are Used
UNS S32750 is about half ferrite and half austenite. The ferrite gives strength and resistance to chloride stress corrosion cracking, the austenite gives toughness, and 0.24 to 0.32 per cent nitrogen lifts pitting resistance. Buyers usually move up from 2205 when the seawater is warmer, chloride levels are higher or sour gas is present.
| Sector | Typical use |
|---|---|
| Oil and gas, offshore | Seawater injection, firewater, produced water, hydraulic tubing |
| Sour gas processing | H2S and chloride lines within NACE MR0175 / ISO 15156 |
| Refining, petrochemicals | Seawater cooled exchangers, overhead condensers |
| Desalination, power | Reverse osmosis high pressure lines, brine heaters |
| Chemical processing, fertilizer | Chloride acids, urea service |
Temperature limit: super duplex is not for hot service. Above about 300 °C it risks 475 °C embrittlement, and ASME allowable stresses stop near 315 °C (600 °F).
Delivery, Packing and Site Storage for Super Duplex Tubing
Packing for sea freight, specified on the order:
- Plastic end caps on all pipe and tube, and bevel protectors on bevelled ends.
- Hexagonal bundles or seaworthy wooden boxes. Thin wall tubing and U tubes go in boxes with separators.
- No contact with carbon steel during packing or handling. Use stainless or nylon straps and wooden or plastic spacers, because carbon steel contamination causes rust staining and pitting.
- Each length marked with grade, standard, size, heat number and the certificate reference.
Request a Quotation for Super Duplex 2507 Pipes and Tubes
Send your material requisition or line list with sizes, quantities and the specifications that apply. If your project uses an operator specification, attach it, so the quotation covers chemistry, testing and documentation from the start.
Send your RFQComplete the System: Super Duplex Fittings and Flanges
To keep chemistry and corrosion resistance consistent across a line, order fittings and flanges in the same grade:
- Butt weld fittings: ASTM A815 UNS S32750 fittings (elbows, tees, reducers and caps to ASME B16.9).
- Super duplex fittings range: super duplex pipe fittings.
- Flanges: Duplex 2507 flanges, ASTM A182 F53 to ASME B16.5.
- Comparing grades: duplex vs super duplex stainless steel pipes, and the guide to duplex stainless steel grades.
- Related products: duplex steel pipes, duplex steel tubes, super duplex steel pipes, super duplex steel tubes.
Super Duplex Tube FAQ
Yes, within limits. NACE MR0175 / ISO 15156-3 accepts solution annealed duplex with PREN above 40 up to set limits on temperature, H2S partial pressure and chlorides, and it sets a maximum hardness. Outside those limits the material must be qualified by testing for the specific service.
ASTM A789 covers seamless and welded duplex tubing for general corrosion service and heat exchangers, with tube OD and wall dimensions. ASTM A790 covers seamless and welded duplex pipe, dimensioned to NPS and schedule. Both list UNS S32750 with the same minimum tensile and yield strength.
No. UNS S32750 is Super Duplex 2507. UNS S32760 is a separate super duplex grade with added tungsten and copper. Both have a PREN of 40 or more, but they are different materials and are certified separately.
5.8 m lengths fit a 20 ft container and 11.8 m lengths fit a 40 ft container. Random and cut lengths are also supplied. State the length you need on the enquiry.
Currencies and Incoterms are confirmed at quotation. State your preferred currency, Incoterm and destination port when you send the RFQ.
Send the grade, standard and any end user specification, OD, wall, length, quantity, end finish, certification level, inspection requirement, destination port and required date.
Pipe is ordered by nominal pipe size and schedule to ASTM A790 and is used for process piping. Tube is ordered by exact OD and wall to ASTM A789 and is used in heat exchangers, condensers and instrumentation, where tighter OD tolerances matter.
Yes. U tubes are bent from seamless SA789 S32750 tube to the bend radii on your tube sheet drawing, with the bends solution annealed and hydrotested after bending where the specification requires it.
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