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 Fittings, UNS S32750 ASTM A815 WP-S32750
From TorqBolt (Mumbai, India): Super Duplex 2507 pipe fittings in UNS S32750 (EN 1.4410) cover the buttweld elbows, tees, reducers, caps, crosses and stub ends used to assemble super duplex piping systems for chloride and sour service. Fittings are produced from 2507 seamless pipe by hot or cold forming and from 2507 forged billet for the heavier weights. TorqBolt holds 2507 buttweld fittings at the Mumbai warehouse in NPS 1/2" through 24" with EN 10204 Type 3.1 mill certificates and Type 3.2 third-party-witnessed on request.
The fittings are supplied to ASTM A815 designation WP-S32750 for wrought ferritic / austenitic / martensitic stainless piping fittings. Dimensions follow ASME B16.9 (factory-made wrought buttwelding fittings) and ASME B16.28 (short-radius elbows and returns). Sour-service certification per NACE MR0175 / ISO 15156-3 is available with controlled hardness and ferrite balance.
Super Duplex 2507 Fittings Size Range
| Fitting Type | Size Range | Schedule / Wall |
|---|---|---|
| 90 degree elbow LR (long radius) | NPS 1/2" to 24" | SCH 10S, 40S, 80S, 160, XXS |
| 90 degree elbow SR (short radius) | NPS 1" to 24" | SCH 40S, 80S |
| 45 degree elbow LR | NPS 1/2" to 24" | SCH 10S, 40S, 80S, 160 |
| 180 degree return bend | NPS 1" to 12" | SCH 40S, 80S |
| Equal tee | NPS 1/2" to 24" | SCH 10S, 40S, 80S, 160 |
| Reducing tee | NPS 1" x 1/2" to 24" x 12" | SCH 40S, 80S |
| Concentric / eccentric reducer | NPS 1" x 1/2" to 24" x 12" | SCH 10S, 40S, 80S, 160 |
| Cap | NPS 1/2" to 24" | SCH 10S, 40S, 80S |
| Stub end | NPS 1/2" to 24" | Per MSS SP-43, ASME B16.9 |
Super Duplex 2507 Fittings Chemistry per ASTM A815 WP-S32750
Per ASTM A815 designation WP-S32750: 25Cr-7Ni-3.5Mo-0.3N. Copper is restricted to 0.50 max as residual, not intentional. PREN of 41 or higher.
| Element | A815 Min % | A815 Max % |
|---|---|---|
| Carbon | (no min) | 0.030 |
| Chromium | 24.0 | 26.0 |
| Nickel | 6.0 | 8.0 |
| Molybdenum | 3.0 | 5.0 |
| Nitrogen | 0.24 | 0.32 |
| Copper | (no min) | 0.50 max, residual, not intentional |
Super Duplex 2507 Fittings Mechanical Properties
| Property | Minimum | Test Standard |
|---|---|---|
| Tensile strength | 795 MPa (115 ksi) | ASTM A370 |
| Yield strength | 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | 15 percent | ASTM A370 |
| Hardness | 32 HRC max, 28 HRC max NACE | NACE MR0175 |
| Charpy V-notch at minus 46 C | 45 J min | NORSOK M-630 |
| Ferrite content | 35 to 55 percent | ASTM E562 |
Manufacture and Heat Treatment
- Elbows: cold or hot drawn from straight pipe over a mandrel, then solution annealed at 1040 to 1100 degrees Celsius and water quenched.
- Tees: hydraulic bulge-formed from straight pipe, then solution annealed and water quenched.
- Reducers: hot pressed from pipe section or formed from 2507 plate, then solution annealed.
- Caps: deep-drawn from 2507 plate or hot spun, then solution annealed.
- All forming work hardens the section, so post-form solution anneal and water quench is mandatory to recover the 35 to 55 percent ferrite balance and Charpy toughness.
Super Duplex 2507 Fittings Applications
- Seawater service piping for offshore platforms, ship sea-chest and ballast water systems
- FGD wet flue-gas-desulfurization absorber and outlet ductwork piping
- Desalination MSF and MED brine recirculation, high-pressure feed and reject lines
- Oil and gas process manifolds, separator piping and high-chloride water injection
- Pulp and paper bleach plant chlorine dioxide and chlorine piping
- Chemical processing dilute acid and chloride process piping
Related Products and Standards
- Super Duplex 2507 pipe per A790
- Super Duplex 2507 welded pipe
- Super Duplex 2507 tube per A789
- Super Duplex 2507 flanges per A182 F53
- Super Duplex 2507 forgings
- Super Duplex 2507 welding wire ER2594 / ER2553
- ASTM A815 standard reference
Super Duplex 2507 Fittings FAQ
Which standards cover 2507 pipe fittings?
ASTM A815 designation WP-S32750 (wrought ferritic / austenitic stainless fittings), ASME B16.9 (factory-made wrought buttwelding fittings), ASME B16.28 (short-radius elbows and returns), MSS SP-43 (light-wall stainless fittings), MSS SP-25 (marking), NORSOK M-630 (material data sheet) and NACE MR0175 / ISO 15156-3 for sour service.
What is the difference between WP-S and WP-W fittings?
WP-S (seamless) is formed from seamless pipe per A790. WP-W (welded) is formed from welded pipe with the longitudinal seam re-annealed in line. WP-WX (welded, extra-tested) adds full radiography of the seam. All three meet the same chemistry and mechanical envelope under ASTM A815. Many sour-service operators prefer WP-S for critical NACE applications.
What is the size range for 2507 buttweld fittings?
NPS 1/2" through 24" is routine. Schedules 10S, 40S, 80S, 160 and XXS are all available. Custom wall thickness on EFW-formed fittings above NPS 16". Reducer ranges run NPS 1" x 1/2" through 24" x 12" both concentric and eccentric.
Are 2507 fittings suitable 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. The application zone, H2S partial pressure and chloride limits are stated on the EN 10204 Type 3.1 or 3.2 certificate when ordered with NACE compliance.
What welding filler do I use for 2507 fittings?
ER2594 (overmatching, slightly higher PREN) or ER2553 (matching) per AWS A5.9. 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 pass. WPS qualified per ASME IX with NORSOK M-601 acceptance.
Does 2507 fittings contain copper?
No, copper is not an intentional alloying element in UNS S32750. ASTM A815 permits 0.50 max as residual, not intentional. Copper-bearing super duplex grades are Zeron 100 (S32760, fittings to A815 WP-S32760) and Ferralium 255 (S32550), which are different alloys and supplied under different ASTM designations.
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