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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
ASTM A790 S32750 Super Duplex Pipe
Super Duplex | UNS S32750 (2507) | PREN ≥ 40
ASME SA790 | NORSOK M-650 | ASTM G48 TestedRelated Products
Introduction
ASTM A790 S32750 Super Duplex Pipe sits one full tier above standard 2205 duplex. Its chemistry pushes chromium to 24-26%, molybdenum to 3.0-5.0% and nitrogen to 0.24-0.32%, which lifts the pitting resistance equivalent number (PREN) above 40, the accepted threshold for the 'super duplex' designation. That extra alloying is what lets S32750 survive hot, concentrated chloride streams that would initiate pitting on 2205 within months, while its two-phase ferrite-austenite structure still resists chloride stress corrosion cracking far better than any 300-series austenitic grade.
The mechanical profile is the other half of the story. Minimum yield strength is 550 MPa and minimum tensile strength is 800 MPa, roughly 20% stronger than 2205 and nearly triple that of TP316L. In pressure piping this converts directly into thinner walls: on large-bore, high-pressure lines the weight saving over 2205 can exceed 15%, which matters on offshore topsides where every tonne of piping is paid for twice, once in steel and once in structural support. The trade-off is a lower elongation floor of 15% and a tighter fabrication window, since S32750 is more prone to secondary phase precipitation if heat input or interpass temperature drifts.
Seamless A790 pipe is solution annealed at 1025-1125°C and water quenched to lock in a balanced 40-60% ferrite structure, then tested for ferrite content, intermetallic phases and pitting resistance per ASTM G48 Method A on request. It is typically specified for subsea manifolds, umbilical and injection lines, high-pressure produced-water systems and chemical plant reactors handling chloride-bearing acids. Continuous service is limited to roughly 250°C because of 475°C embrittlement risk, so it is not a substitute for the austenitic high-temperature grades in the same product family.
Specifications
| Material Grade | S32750 / 2507 (UNS S32750) |
| Standard | ASTM A790, ASME SA790 |
| Outer Diameter | 13.7mm - 325mm |
| Wall Thickness | 1.65mm - 30mm |
| Length | Up to 12000mm |
| Finish | Solution Annealed, Pickled |
Chemical Composition
| C | Cr | Ni | Mo | N |
| ≤.03 | 24-26 | 6-8 | 3.0-5.0 | .24-.32 |
Super Duplex PREN ≥ 40
Mechanical Strength
Comprehensive Info
| MOQ | 300kg |
| Lead Time | 35 - 50 Days |
| Testing | G48 Pitting, Ferrite & Hydro |
| Max Continuous Temp | ~250°C |
Key Applications
Subsea Systems Manifolds, injection and umbilical lines
Produced Water High-pressure chloride-laden water handling
Chemical Reactors Chloride-bearing acid process piping
Advantages
550 MPa Yield
About 20% stronger than 2205, allowing thinner walls.
PREN Above 40
Withstands hot chloride streams that pit 2205.
Weight Reduction
Large-bore lines can be over 15% lighter than 2205.
Phase Verified
Ferrite and intermetallic checks on every heat.
About Jiangsu Jend Tube Co.,Ltd.
As China ASTM A790 S32750 Super Duplex Pipe Manufacturers and Wholesale ASTM A790 S32750 Super Duplex Pipe Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Usage Tips
Narrow Weld Window
Keep heat input low and interpass temperature under 100°C to avoid sigma and chi phase in the heat-affected zone.
Temperature Ceiling
Do not specify for continuous service above about 250°C; the 475°C embrittlement range shortens toughness life.
Services
G48 Pitting Test
Method A test coupons per heat on request.
Ferrite Mapping
Phase balance checks on base metal and welds.
Bevel Preparation
Narrow-gap bevels for automated welding.
Logistics
30% T/T Deposit / L/C at sight. Each length sleeved in clean plastic, end capped, then packed in plywood cases to keep carbon-steel contamination away from the pipe surface.
Standards
ASME SA790
NORSOK M-650
NACE MR0175 / ISO 15156
ISO 9001
Frequently Asked Questions
What makes S32750 'super' duplex?
A pitting resistance equivalent number above 40, achieved through 25% chromium, 3-5% molybdenum and 0.24-0.32% nitrogen.
How much stronger is S32750 than 2205?
Minimum yield is 550 MPa versus 450 MPa, about 20% higher, with tensile strength of 800 MPa.
Why is elongation lower than other duplex grades?
The higher alloy content and strength reduce ductility, so the minimum elongation is 15% instead of 25%.
What is the service temperature limit?
About 250°C continuous, because prolonged exposure near 475°C embrittles the ferrite phase.
Is ASTM G48 testing available?
Yes, Method A ferric chloride pitting tests can be run on samples from each heat when the order specifies it.
Can it be used in seawater?
Yes, it is one of the standard choices for seawater and brine service where 2205 shows crevice attack.
Ready to Order S32750 Super Duplex Pipe?
Send your pressure class, chloride level and temperature for a wall thickness comparison against 2205.
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