Super Duplex Steel Pipe Specifications

Super duplex steel pipe is manufactured per ASTM A790 / ASME SA-790 (seamless and welded) and ASTM A928 (EFW with filler metal). The specification table below covers applicable standards, sizes, and forms.

Parameter Details
Standards ASTM A790 / ASME SA-790
Grades UNS S32750
Nominal Bore 1/2" to 36" NB (DN 15 to DN 900)
Outside Diameter 21.3 mm to 914.4 mm
Wall Thickness Sch 5S, 10S, 20, 40S, 80S, 160, XXS
Length 6m (single random), 12m (double random), custom
Forms Seamless, welded (EFW), welded (autogenous)
End Types Plain end, bevelled end
Surface Finish Pickled, annealed and pickled, polished
Dimensional Standard ASME B36.19M

Super Duplex Steel Pipe Sizes

The following technical data provides a comprehensive overview of the wall thickness specifications and dimensional standards for Super Duplex Steel Pipes.

Parameter Specification / Range
Nominal Bore (NB) 1/2" NB to 36" NB (DN 15 – DN 900)
Outside Diameter (OD) 21.3 mm to 914.4 mm
Wall Thickness Schedule 5S, 10S, 40S, 80S, up to XXS
Standard Lengths 6 Meters and 12 Meters
Large Diameter (EFW) Up to 48" OD and above (ASTM A928)
Custom Services Precision Cut-to-Length

Super Duplex Pipe Schedule Chart

The schedule chart below maps common nominal bore sizes to outside diameter, wall thickness, and approximate weight per metre. Super duplex density is approximately 7.8 g/cm3.

NB (inch) OD (mm) Sch 10S WT (mm) Sch 40S WT (mm) Sch 80S WT (mm)
1/2" 21.3 2.11 2.77 3.73
1" 33.4 2.77 3.38 4.55
2" 60.3 2.77 3.91 5.54
4" 114.3 3.05 6.02 8.56
6" 168.3 3.40 7.11 10.97
8" 219.1 3.76 8.18 12.70
12" 323.8 4.57 10.31 17.48

Super Duplex Steel Pipe Price

In India, super duplex pipes average $10–15/kg, whereas US rates hit $14–20/kg; final pricing always depends on the specific grade and size of your material. Grade S32750 is cost-effective. Seamless options cost more than welded ones. These pipes cost 30-50% more than standard duplex 2205, a premium driven by their superior alloy content and rigorous industrial manufacturing controls.


Get the Best Price on Super Duplex Steel Pipe Request a Quote

Types of Super Duplex Steel Pipe

Super Duplex Seamless Pipe

Super Duplex Seamless Pipe

Super Duplex Welded Pipe

Super Duplex Welded Pipe

Super Duplex Steel Pipe Grades

Our superior Super Duplex Steel Pipe grade provides outstanding corrosion resistance and elevated mechanical strength for the most rigorous industrial settings.

Grade 2507 (UNS S32750 / SAF 2507)

Super duplex pipe grade 2507 is most typically specified worldwide. Its PREN of 42 exceeds 40. Minimum yield is 80 ksi (550 MPa) and tensile strength is 116 ksi (800 MPa). Desalination plants, offshore platforms, and subsea pipes are the main uses.

Super Duplex Steel Pipe Industrial Applications

Explore the primary industrial applications for Super Duplex Steel Pipe, where extreme durability meets superior resistance in the following sectors:

Offshore Oil & Gas

SDSS pipe in grade 2507 is specified for topside piping, subsea flowlines, and firewater systems on offshore platforms, meeting NORSOK MDS D56 requirements.

Desalination & Water Treatment

High-chloride seawater intake and brine circuits in desalination plants rely on super duplex pipe's pitting resistance (PREN above 40) at elevated temperatures.

Chemical & Petrochemical Processing

Aggressive process media containing chlorides, sulphuric acid, or mixed acids require 2507 pipe for reactor piping, heat exchanger tubing connections, and transfer lines.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect super duplex steel pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
Bundle Yard Staging Pipe Bundle Yard Staging
Bundle Edge Protection Container End-Cap Protection
Export-Ready Bundles Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies super duplex steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

  • USA flagUSA
  • Canada flagCanada

Frequently Asked Questions:

What Is the ASTM Standard for Super Duplex Steel Pipe?+
The ASTM standard for super duplex steel pipe is ASTM A790 / ASME SA-790, covering both seamless and welded pipe. ASTM A928 applies specifically to electric fusion-welded (EFW) pipe with filler metal. Grades covered include S32750.
What Sizes Are Available in Super Duplex Steel Pipe?+
Super duplex steel pipe is available from 1/2" NB to 36" NB (DN 15 to DN 900) in schedules 5S through XXS. Standard lengths are 6m and 12m. EFW pipe per ASTM A928 can be produced in OD sizes above 48".
What Is the Difference Between Seamless and Welded Super Duplex Pipe?+
Seamless super duplex pipe has no weld seam and is preferred for high-pressure, sour service, and critical applications. Welded pipe (EFW per ASTM A928) is available in larger diameters and costs less for lower-pressure service. Both types meet ASTM A790 requirements when solution annealed.
What Is the Pressure Rating of Super Duplex Pipe?+
Conduit size, schedule, and design temperature affect pressure ratings. Grade 2507 is better than austenitic or ordinary duplex grades with the same wall thickness because it has a high yield strength of at least 80 ksi (550 MPa). This mechanical advantage makes your piping systems robust under high operational stress. Calculations follow the design code or ASME B31.3.
Can Super Duplex Pipe Be Delivered in "As Welded" (HT-O) Condition?+
Per ASTM A928, EFW super duplex pipe may be supplied in the as welded (HT-O) condition for certain sizes, particularly OD greater than 600 mm. HT-O delivery skips the full solution anneal. Buyers should confirm mechanical property implications with the manufacturer before specifying HT-O for critical service.
What Is the Weight of Super Duplex Steel Pipe per Metre?+
Weight depends on OD and wall thickness. Use the formula: Weight (kg/m) = (OD - WT) x WT x 0.02491, where OD and WT are in mm. Super duplex density is approximately 7.8 g/cm3. For a 6" Sch 40S pipe (168.3 mm OD, 7.11 mm WT), the weight is roughly 28.2 kg/m.
What Welding Process Is Used for Super Duplex Pipe?+
Technicians weld super duplex pipe using GTAW, SMAW, or SAW processes and matching AWS ER2594 or E2594 fillers. While ASTM A790 mandates post-weld solution annealing, ASTM A928 provides exceptions for as-welded conditions. This rigorous approach prevents structural failures in high-stress industrial environments.
Where Can I Buy Super Duplex Steel Pipe?+
Super duplex steel pipes are available from Sachiya Steel International. Mill test certifications accompany our ASTM A790 / ASME SA-790 pipes, which we manufacture and export. Our ready stock ensures fast dispatch for urgent needs. Just contact us for current pricing and availability. We are here to support your upcoming project goals.

Consult our experts for custom material solutions. Request a Quote