Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175 / ISO 15156-2
- NORSOK M-650 Qualified
- API 6A Certified
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Super Duplex 2507 Pipe, UNS S32750 ASTM A790 Seamless and Welded
Super Duplex 2507 pipe in UNS S32750 / EN 1.4410 / ASTM A790 is the standard piping grade for high-chloride and sour-service applications where standard 2205 duplex and 6 percent molybdenum austenitics are insufficient. TorqBolt holds seamless and welded super duplex 2507 pipe stock at the Mumbai warehouse in NPS 1/2" through 24", schedules 5S through XXS, with full mill test certificates per EN 10204 Type 3.1 (Type 3.2 third-party-witnessed available on request).
The pipe meets ASTM A790 for seamless and welded ferritic / austenitic stainless pipe, NORSOK M-630 material data sheet for super duplex, and NACE MR0175 / ISO 15156-3 for sour service. Companion fittings are supplied to ASTM A815 WP-S32750; flanges to ASTM A182 F53.
Super Duplex 2507 Pipe Size Range
| Form | Size Range | Schedule |
|---|---|---|
| Seamless pipe (ASTM A790) | NPS 1/2" to 8" (DN 15 to DN 200) | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Welded pipe (ASTM A790) | NPS 6" to 24" (DN 150 to DN 600) | SCH 10S, 40S, 80S, custom wall |
| EFW (electric fusion welded) | NPS 16" and above | Custom thickness, X-ray and radiography per A790 |
| Length | Random 5.8 to 7.0 m, double random 11 to 13 m, cut-to-length on request | |
Super Duplex 2507 Pipe Chemistry per ASTM A790
Chemistry mirrors UNS S32750: 25Cr-7Ni-3.5Mo-0.3N with no intentional copper or tungsten. PREN of 41 or higher.
| Element | A790 Min % | A790 Max % |
|---|---|---|
| Carbon (C) | (no min) | 0.030 |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 5.0 |
| Nitrogen (N) | 0.24 | 0.32 |
| Manganese (Mn) | (no min) | 1.20 |
| Silicon (Si) | (no min) | 0.80 |
| Phosphorus (P) | (no min) | 0.035 |
| Sulfur (S) | (no min) | 0.020 |
Super Duplex 2507 Pipe Mechanical Properties
| Property | Minimum | Test Standard |
|---|---|---|
| Tensile strength | 795 MPa (115 ksi) | ASTM A370 |
| Yield strength (0.2 percent offset) | 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | 15 percent (longitudinal) | ASTM A370 |
| Hardness (sour-service) | 28 HRC max | NACE MR0175 |
| Charpy V-notch at minus 46 degrees Celsius | 45 J min (full set) | NORSOK M-630, ASTM E23 |
| Hydrostatic test | To pressure per A999 paragraph 8 | ASTM A999 |
| Eddy current or ultrasonic NDE | Per A790 supplementary requirement | ASTM A790, A1016 |
Seamless vs Welded vs EFW Pipe
All three pipe types meet ASTM A790 for super duplex 2507. Selection depends on size, service, and project specification.
- Seamless (extruded or hot-piercing): preferred for NPS 1/2" to 8". No weld seam, no longitudinal HAZ. Required by some end-users for critical sour service.
- Welded (longitudinal seam, EW or HFW): cost-effective for NPS 6" to 24". Weld seam is solution-annealed in line, ferrite content controlled per NORSOK M-630.
- EFW (electric fusion welded): for large diameters above NPS 16". Welded with super duplex filler ER2594 / ER2553 per AWS A5.9, X-ray inspected.
Welding Super Duplex 2507 Pipe
Field welding of super duplex 2507 pipe requires:
- Filler ER2594 (overmatching, slightly higher PREN) or ER2553 (matching) per AWS A5.9
- Heat input 0.5 to 2.5 kJ per millimetre, interpass temperature below 150 degrees Celsius
- Argon plus 2 to 5 percent nitrogen shielding for GTAW root pass
- WPS qualified per ASME IX with super duplex specific NORSOK M-601 acceptance criteria
- Post-weld ferrite count per ASTM E562, target 35 to 65 percent in weld metal
Super Duplex 2507 Pipe Applications
- Seawater service, high-chloride pipe for offshore platforms, ship sea-chest, ballast water, FGD seawater scrubbers
- Oil and gas, production manifolds, christmas tree piping, high-pressure flowlines
- Desalination, high-pressure brine piping in MSF, MED, and RO plants
- Marine and subsea, subsea jumpers, manifold piping, tieback flowlines
- FGD, wet flue gas desulfurization absorber piping, quencher, outlet ducts
- Chemical processing, dilute HCl, H2SO4, HF service in heat exchangers and reactors
- Pulp and paper, bleach plant chlorine dioxide piping
Related Products and Standards
- Super Duplex 2507 tube (ASTM A789)
- Super Duplex 2507 welded pipe
- Super Duplex 2507 fittings (ASTM A815 WP-S32750)
- Super Duplex 2507 flanges (ASTM A182 F53)
- Super Duplex 2507 stud bolts for pipe-flange connections
- UNS S32750 reference
- ASTM A790 standard reference
Super Duplex 2507 Pipe FAQ
What standards does TorqBolt's Super Duplex 2507 pipe meet?
ASTM A790 (seamless and welded ferritic / austenitic stainless steel pipe, designation S32750), EN 10216-5 (European pressure-purpose seamless tube), NORSOK M-630 (material data sheet), NACE MR0175 / ISO 15156-3 (sour service), API 6A (wellhead), API 17D (subsea).
What is the size range for Super Duplex 2507 pipe?
Seamless: NPS 1/2" to 8". Welded: NPS 6" to 24". EFW: NPS 16" and above. Schedules 5S through XXS. Cut-to-length on request.
What welding filler do I use for Super Duplex 2507 pipe?
ER2594 (overmatching) or ER2553 (matching) per AWS A5.9. Both are nitrogen-enhanced fillers. Heat input 0.5 to 2.5 kJ per millimetre, interpass below 150 degrees Celsius. Argon plus 2 to 5 percent nitrogen shielding for GTAW root.
Is Super Duplex 2507 pipe acceptable for sour service?
Yes, qualified per NACE MR0175 / ISO 15156-3 with hardness restricted to 28 HRC maximum and ferrite content within 35 to 65 percent. Specific H2S partial pressure and chloride limits depend on the application zone classification.
What mill certificates accompany TorqBolt Super Duplex 2507 pipe?
EN 10204 Type 3.1 mill test certificate is standard, traceable to the original heat number. Type 3.2 third-party-witnessed certificates (Lloyds, DNV, BV, ABS, TÜV) are available on request and are common on NORSOK M-650 QTR-qualified supplies for Norwegian Continental Shelf projects.
Can TorqBolt cut Super Duplex 2507 pipe to length?
Yes. Standard random length is 5.8 to 7.0 m; double random is 11 to 13 m. Cut-to-length is available with end preparation (bevel for welding, plain end, threaded end per project requirement).
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