S32750 Pipes & Pipe Fittings
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Super Duplex S32750 (SAF 2507) Pipes & Pipe Fittings Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier, importer, stockist and trading company for Super Duplex Stainless Steel S32750 (SAF 2507) pipes and pipe fittings based in Mumbai, India. We supply seamless pipes (ASTM A790 / ASME SA790) and welded pipes (ASTM A928 / ASME SA928) with matching buttweld fittings.
UNS S32750 (Werkstoff 1.4410 / ASTM A815 WPS32750), also known as SAF 2507, is a super duplex austenitic-ferritic stainless steel with approximately 50/50 phase balance. Its composition of 25% Cr, 7% Ni, 4% Mo, and 0.24-0.32% N delivers a PREN ≥40, which classifies it as super duplex. Typical PREN falls between 41 and 43. CPT exceeds 50°C in seawater and chloride SCC resistance is among the highest of any stainless steel. Minimum tensile strength reaches 795 MPa (116 ksi) with yield at 550 MPa (80 ksi), roughly 2.5x that of 316L and 1.5x Duplex 2205. That high yield allows thinner-walled pipes that cut weight and material cost while holding pressure ratings. Impact toughness holds to -50°C. Maximum service temperature is ~300°C (570°F), above 316°C, 475°C, the metal risks embrittlement and sigma.
Pipes are supplied as seamless to ASTM A790/A789 and as EFW welded to ASTM A928 and EN 10216-5 / 10217-7 (1.4410). Fittings follow ASTM A815 for buttweld. Material meets NACE MR0175 / ISO 15156 for sour service. Sizes range from NPS 1/2″ to 24″ in Schedules 5S to XXS.
Super Duplex S32750 Pipes & Fittings – Specifications
The following tables summarise applicable ASTM, ASME and EN standards, size ranges, schedules and heat treatment requirements for Super Duplex S32750 pipes and pipe fittings.
| Pipes specifications | |
|---|---|
| Parameter | Details |
| Pipe & Tube Standards | ASTM A790, A928 / ASME SA790, SA928 (UNS S32750) |
| EN Standard | EN 10216-5, EN 10217-7 (1.4410) |
| Size Range | NPS 1/2″ to 24″; OD 6.35-609.6 mm |
| Wall / Schedule | SCH 5S, 10S, 40S, 40, 80S, 80, 120, 160, XXS |
| Condition | Solution annealed 1040-1120°C + water/rapid air quench |
| Fittings Specifications | |
| Parameter | Details |
| Fittings Standards | Buttweld Fittings: ASTM A815 / ASME SA815 (WPS32750) |
| Dimensions | ASME B16.9, B16.28 |
| Size | BW Size: NPS 1/2″ to 48″ |
Chemical Composition of Super Duplex S32750 Pipes & Fittings
ASTM A790 specified chemical composition limits for Super Duplex S32750, defining controlled alloying elements for strength and enhanced pitting resistance.
| Material / Element | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 (%) | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | Balance |
High nitrogen (0.24-0.32%) stabilises austenite, improves pitting resistance, and increases strength. PREN = %Cr + 3.3×%Mo + 16×%N ≥ 41, qualifying S32750 as super duplex (PREN ≥40). Low carbon (≤0.030%) minimises carbide precipitation during welding.
Mechanical Properties of Super Duplex S32750 Pipes & Fittings
ASTM A790 minimum mechanical requirements for solution-annealed Super Duplex S32750 pipes and fittings used in demanding pressure and corrosion service.
| Material / Property | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) | Charpy Impact (min) |
|---|---|---|---|---|---|
| S32750 | 795 MPa (116 ksi) | 550 MPa (80 ksi) | 15% | 32 HRC (310 HBW) | 27 J at -46°C |
Yield of 550 MPa is ~2.5x that of 316L (220 MPa) and 1.5x Duplex 2205 (450 MPa). This allows thinner wall sections that reduce weight and cost. Impact toughness holds to -50°C; not recommended below that due to ferrite brittleness. Hardness max 32 HRC per NACE MR0175.
Super Duplex S32750 (2507) Equivalent Grades
The following table lists international equivalent designations and governing standards for Super Duplex S32750 (2507).
| Property | UNS | Werkstoff Nr. | EN | AFNOR | SAF (Sandvik) | ASTM Pipe | ASTM Fittings | NORSOK | NACE |
|---|---|---|---|---|---|---|---|---|---|
| Designation | S32750 | 1.4410 | X2CrNiMoN25-7-4 | Z3CrNi25-06Az | SAF 2507 | A790 / A789 | A815 | M-630 listed | MR0175 / ISO 15156 |
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Types of Super Duplex S32750 (2507) Pipes & Fittings
Super Duplex S32750 pipes are built for aggressive chloride-bearing piping systems, from offshore platforms and subsea equipment to desalination plants and chemical process lines.
Super Duplex S32750 Seamless Pipe (ASTM A790)
Super Duplex S32750 Welded Pipe (ASTM A928)
Super Duplex S32750 Seamless Tube (ASTM A789)
Super Duplex S32750 ERW / EFW Pipe
Super Duplex S32750 Elbow (45° / 90° / 180°)
Super Duplex S32750 Tee (Equal / Reducing)
Super Duplex S32750 Reducer (Concentric / Eccentric)
Super Duplex S32750 Cap & Stub End
Industries Using Super Duplex S32750 Pipes & Fittings
S32750 is specified where piping faces aggressive chloride environments combined with high mechanical loads.
- Offshore Oil & Gas: The largest application. Subsea pipelines, platform process piping, seawater injection, fire-fighting systems and ballast water. NACE MR0175 sour service. Topside and subsea manifolds, wellhead equipment. Replaces Inconel 625 in many offshore piping runs.
- Desalination & Water Treatment: High-pressure RO plant piping, seawater intake and brine handling. Resists pitting in warm concentrated brine.
- Chemical Processing: Organic acid production, chloride-bearing process streams, FGD scrubber piping, heat exchangers.
- Marine & Shipbuilding: Propeller shafts, rudder components, seawater piping, pump shafts, instrument tubing.
- Pulp & Paper: Black liquor heater tubes, digester blow valves, bleaching components, brownstock washers.
- Power Generation: Used in FGD scrubber piping and in cooling water systems that are exposed to chloride contamination.
- Mining & Hydrometallurgy: Acid leach piping, process piping for chloride-rich mining solutions.
How to Order Super Duplex S32750 Pipes & Fittings from Nicorex Alloys
To order, provide the following details:
- Product Form: Seamless / Welded Pipe or Fittings (Elbow, Tee, Reducer, End Cap, Stub End)
- Size
- End Type / Connection: Pipes: PE / BE / TE / Fittings: Butt Weld
- Material Grade: Super Duplex Stainless Steel / UNS S32750 / W.Nr. 1.4410
- Quantity: (total weight in kg / MT)
- Standard: Pipes: ASTM A790 / ASME SA790 / Fittings: ASTM A815 / ASME SA815, ASME B16.9, ASME B31.3
- Additional Requirements: (PREN ≥ 42 confirmation, solution annealed condition, ferrite content, NACE MR0175 compliance, heat/lot traceability)
- Documentation: (MTC EN 10204 3.1/3.2, PMI Report, Ferrite Number (FN) Report, Mechanical Properties Report, IGC Test Report, Charpy Impact Test Report, TPI Certificate)
- Packaging: PVC end caps on pipes / individual polybag per fitting, bundled with steel strapping, ISPM 15 compliant export crating with VCI wrap and full labelling
- Delivery Destination: (Domestic / International)
Frequently Asked Questions
What is the maximum Operating Temperature for S32750 Pipe?
~300°C (570°F) for continuous service. Above 316°C, 475°C embrittlement and sigma phase formation degrade toughness and corrosion resistance.
What is the Pressure rating of S32750 Pipe?
Pressure ratings depend on schedule, size, and design temperature per ASME B31.3. The 550 MPa yield allows higher allowable stresses than 316L or Duplex 2205 at the same wall thickness.
Can UNS S32750 Pipe Fittings be used in Seawater Environments?
Yes. CPT exceeds 50°C in seawater, making S32750 the standard choice for warm tropical seawater where Duplex 2205 falls short.
What is the difference between S32760 and S32750 Pipe?
S32760 (Zeron 100) adds tungsten (0.5-1.0%) and copper (0.5-1.0%). Both grades meet PREN ≥40. S32750 is more widely stocked, lower cost, and preferred when W+Cu aren’t specified.