Super Duplex 2507 Pipe Schedule Chart
Oct 19, 2026
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What Is Super Duplex 2507 Pipe?
Super Duplex 2507 pipe is manufactured from UNS S32750 stainless steel, a super duplex grade with a ferrite-austenite microstructure. It is commonly specified under ASTM A790 / ASME SA-790 for duplex stainless steel pipe. Depending on the application and order, the pipe may be seamless or welded.
|
Item |
Description |
|---|---|
|
Common grade |
Super Duplex 2507 |
|
UNS designation |
S32750 |
|
EN material number |
1.4410 |
|
Common pipe standard |
ASTM A790 / ASME SA-790 |
|
Typical alloy composition |
25% Cr, 7% Ni, 4% Mo, plus nitrogen |
|
Pipe manufacturing route |
Seamless or welded, subject to specification and availability |
|
Schedule system |
Commonly based on ASME B36.19M stainless steel pipe dimensions; confirm the project standard |
|
Main applications |
Offshore piping, seawater handling, desalination, chemical processing, and corrosive-fluid systems |
Super Duplex 2507 Pipe Schedule Chart
The following chart summarizes commonly used nominal pipe sizes and wall thicknesses. Dimensions are shown in millimeters, with outside diameters based on standard NPS dimensions. The values are a dimensional reference, not a confirmation that every size and schedule is available in 2507.
|
NPS |
Outside diameter (mm) |
SCH 10S wall (mm) |
SCH 40S wall (mm) |
SCH 80S wall (mm) |
|---|---|---|---|---|
|
1/2" |
21.34 |
2.11 |
2.77 |
3.73 |
|
3/4" |
26.67 |
2.11 |
2.87 |
3.91 |
|
1" |
33.40 |
2.77 |
3.38 |
4.55 |
|
1 1/4" |
42.16 |
2.77 |
3.56 |
4.85 |
|
1 1/2" |
48.26 |
2.77 |
3.68 |
5.08 |
|
2" |
60.33 |
2.77 |
3.91 |
5.54 |
|
2 1/2" |
73.03 |
3.05 |
5.16 |
7.01 |
|
3" |
88.90 |
3.05 |
5.49 |
7.62 |
|
4" |
114.30 |
3.05 |
6.02 |
8.56 |
|
5" |
141.30 |
3.40 |
6.55 |
9.53 |
|
6" |
168.28 |
3.40 |
7.11 |
10.97 |
|
8" |
219.08 |
3.76 |
8.18 |
12.70 |
|
10" |
273.05 |
4.19 |
9.27 |
12.70 |
|
12" |
323.85 |
4.57 |
9.53 |
12.70 |
- NPS (Nominal Pipe Size): A standardized size designation, not the pipe's measured outside diameter.
- Outside diameter (OD): The nominal external diameter used for dimensional matching and connection design.
- Schedule (SCH): A designation associated with nominal wall thickness at a given NPS. A higher schedule usually means a thicker wall for that size.
- Wall thickness (WT): A key input for pressure design, corrosion allowance, weight, and flow capacity.
For example, a 2-inch NPS 2507 pipe has a nominal outside diameter of 60.33 mm. Its listed wall thickness is 2.77 mm for SCH 10S, 3.91 mm for SCH 40S, and 5.54 mm for SCH 80S. These are nominal dimensions; permitted manufacturing tolerances must also be considered.
What is the wall thickness of 2507-grade SCH 40 pipe?
The wall thickness depends on the Nominal Pipe Size (NPS). For example, according to standard reference tables, an NPS 1 pipe with an SCH 40S wall thickness measures 3.38 mm; for NPS 2, it is 3.91 mm; and for NPS 4, it is 6.02 mm. Always verify the applicable dimensional standards.
What is the difference between Sch 40S and Sch 40 ?
Sch 40S (per ASME B36.19M) is the standard for pressure piping - it has slightly different wall thicknesses than Sch 40 (per ASME B36.10M, which is for structural pipe). For stainless and duplex steel pipe in process applications, always specify Sch 40S, not Sch 40.
Pressure Rating Of Super Duplex 2507 Pipe
For small-bore instrumentation tubing, published manufacturer data provide working pressures based on specified tubing dimensions, material condition, and design-code assumptions. The following values are for tubing, not standard NPS pipe, and must not be applied directly to ASTM A790 pipe.
|
Tube OD (in.) |
Wall Thickness (in.) |
Published Working Pressure (psig) |
Approx. Pressure (bar) |
Basis |
|---|---|---|---|---|
|
1/4 |
0.035 |
10,000 |
689 |
ASME B31.3 |
|
1/4 |
0.049 |
15,000 |
1,034 |
ASME B31.3 |
|
3/8 |
0.049 |
10,100 |
695 |
ASME B31.3 |
|
3/8 |
0.065 |
12,700 |
875 |
ASME B31.3 |
|
1/2 |
0.065 |
10,100 |
697 |
ASME B31.3 |
|
1/2 |
0.083 |
12,900 |
889 |
ASME B31.3 |
ASTM A790 UNS S32750Pipe Chemical Composition
| Element | Min (%) | Max (%) |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 5.0 |
| Nitrogen (N) | 0.24 | 0.32 |
| Carbon (C) | - | 0.030 |
| Manganese (Mn) | - | 1.20 |
| Silicon (Si) | - | 0.80 |
| Copper (Cu) | - | 0.50 |
| Phosphorus (P) | - | 0.035 |
| Sulfur (S) | - | 0.020 |
| Iron (Fe) | Balance | - |
ASTM A790 UNS S32750 Mechanical Properties (Solution Annealed)
| Property | Metric | Imperial |
| Yield Strength (Rp0.2) | ≥ 550 MPa | ≥ 80 ksi |
| Tensile Strength (Rm) | ≥ 800 MPa | ≥ 116 ksi |
| Elongation (50 mm / 2") | ≥ 15% | ≥ 15% |
| Hardness | ≤ 310 HBW | ≤ 32 HRC |
| Impact Energy (20 °C) | ≥ 77 J | ≥ 57 ft·lb |
| Max. Service Temperature | 300 °C | 572 °F |
Super Duplex 2507 Pipe Tolerances (ASME B36.19M)
| Parameter | Tolerance |
| OD < 38.1 mm (1½") | ± 0.13 mm (± 0.005") |
| OD 38.1–76.2 mm (1½"–3") | ± 0.25 mm (± 0.010") |
| OD > 76.2 mm (3") | ± 0.38 mm (± 0.015") |
| Wall Thickness | ± 10% |
| Length (cut) | +3 mm / 0 mm (per cut) |
| Length (random) | +50.8 mm / 0 mm |
| Straightness | 0.15% of length, max 15 mm |
Super Duplex 2507 Pipe Supplier
GNEE offers Super Duplex 2507 (UNS S32750 / EN 1.4410) stainless steel pipes, which can be supplied in accordance with ASTM A790 / ASME SA-790 standards to meet project requirements. Both seamless and welded pipe options are available. We can accommodate various specifications, including specific outside diameters, wall thicknesses, and schedules such as SCH 10S, SCH 40S, and SCH 80S. Please confirm specific dimensions, stock availability, and lead times at the time of order.
Available Product Forms
| Product Form | Manufacturing Method / Type | Standard Specification | Common Size Range (NPS / OD) | Common Wall Thickness / Pressure Class | Typical End Preparation |
| Seamless Pipe | Hot finished, Cold drawn, Solution annealed & quenched | ASTM A790 / ASME SA790 EN 10216-5 |
1/2" to 8" (up to 12" on request) | Sch 10S, Sch 40S, Sch 80S, Sch 160, Sch XXS | Plain End (PE), Beveled End (BE) |
| Welded Pipe (Straight Seam) | Longitudinal Welded (PAW, TIG, Laser, or Submerged Arc) | ASTM A790 / ASME SA790 ASTM A928 (Class 1 to 5) EN 10217-7 |
3" to 24" (or larger) | Sch 5S, Sch 10S, Sch 40S, Sch 80S | Plain End (PE), Beveled End (BE) |
| Seamless Tube | Cold drawn, bright annealed / pickled | ASTM A789 / ASME SA789 EN 10216-5 |
1/4" to 2" OD (Instrumentation) | 0.035" to 0.120" WT (0.89mm to 3.0mm) | Plain End, Cut square, Deburred |
What information is required when requesting a quote for 2507 piping?
At a minimum, you should provide the following details: steel grade, product standard, manufacturing method (seamless or welded), nominal pipe size (NPS) or outside diameter, wall thickness or schedule, length, quantity, inspection requirements, and delivery destination. For complex orders, providing drawings or a project piping list is highly recommended.
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