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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
S32750 Super Duplex Stainless Steel Tube
ASTM A789 / A790 | UNS S32750 | Super Duplex Austenitic-Ferritic Grade
ISO 9001 | PED | TS CertifiedRelated Products
Introduction
S32750 Super Duplex Stainless Steel Tube, also widely known as Alloy 2507, represents the pinnacle of dual-phase metallurgical engineering. Designed specifically for the most aggressive chloride environments, S32750 (UNS S32750) is characterized by its high Chromium (25%), Molybdenum (4%), and Nickel (7%) content, balanced with controlled Nitrogen additions. This chemical composition results in a microstructure consisting of approximately equal parts of austenite and ferrite, providing a synergistic combination of extreme mechanical strength and exceptional resistance to localized corrosion. In the hierarchy of stainless steels, Super Duplex S32750 stands far above standard 316L and even standard 2205 duplex, offering a Pitting Resistance Equivalent Number (PREN) of at least 40. This makes it a critical material for subsea oil and gas, desalination, and chemical processing industries where failure is not an option.
The technical superiority of S32750 lies in its remarkable resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion. In offshore environments, the combined effects of high pressure, high temperature, and saline water can lead to rapid material degradation. S32750 effectively mitigates these risks; its ferritic phase provides a high threshold against SCC, while the molybdenum and nitrogen work together to reinforce the passive protective layer against halide ions. Furthermore, the yield strength of S32750 is significantly higher than most austenitic and standard duplex grades. This allows engineers to design fluid transport systems with thinner wall thicknesses for a given pressure rating, resulting in substantial weight reduction—a factor of paramount importance for the structural load limits of offshore platforms and deep-water subsea manifolds.
Manufacturing S32750 seamless tubing requires ultra-precise thermal control to avoid the precipitation of detrimental intermetallic phases. During the solution annealing process, which is conducted at temperatures between 1025°C and 1125°C, the material must be rapidly quenched in water. Any delay in the cooling rate can lead to the formation of Sigma (σ) phase, which drastically reduces the tube's impact toughness and corrosion resistance. Our seamless production methodology—utilizing advanced cold-rolling and drawing—ensures a perfectly homogeneous grain structure without the longitudinal weak points found in welded pipes. This structural integrity is vital for high-pressure applications, such as chemical injection lines and high-pressure reverse osmosis (SWRO) systems, where the material must endure cyclic mechanical fatigue and aggressive chemical erosion simultaneously.
Beyond its corrosion and strength metrics, S32750 offers excellent thermal conductivity and a low coefficient of thermal expansion, which are advantageous for heat exchanger designs. Its high hardness also provides a high level of resistance to erosion-corrosion in high-velocity or abrasive fluid streams. Compliance with international standards such as ASTM A789 and A790, as well as NACE MR0175/ISO 15156 for sour service, ensures that our S32750 tubing meets the most stringent global safety codes. By selecting Super Duplex S32750, project stakeholders are investing in a material that offers maximum reliability and a significantly extended service life in the world's most demanding environments, effectively minimizing the risk of unplanned downtime and lowering the long-term operational costs of critical energy and industrial infrastructure.
Specifications
| Material | S32750 / 2507 / 1.4410 |
| Standards | ASTM A789, A790, EN 10216-5 |
| OD Range | 6.0mm - 406.4mm |
| WT Range | 1.0mm - 30.0mm |
| Phase | 40-60% Ferrite Balance |
Chemical Composition
| C | Cr | Ni | Mo | N |
| ≤.03 | 24-26 | 6.0-8.0 | 3.0-5.0 | .24-.32 |
PREN ≥ 40 Super Duplex
Mechanical Strength
Quality Control
| NDT | 100% ET & UT Testing |
| Corrosion | ASTM G48 Method A Test |
| Micro | Sigma Phase Examination |
Industrial Applications
Subsea Oil & Gas Umbilicals, risers, and manifolds
SWRO Desalination High-pressure piping and pump lines
Chemical Process Organic acid reactors and exchangers
Strategic Advantages
Ultra High PREN
Minimum 40 PREN ensures total protection in severe seawater.
Superior Strength
Highest yield strength among duplex alloys for max weight savings.
SCC Immunity
Excellent defense against chloride stress corrosion cracking.
Hardness
High surface hardness resists erosion from high-velocity slurries.
About Jiangsu Jend Tube Co.,Ltd.
As China S32750 Super Duplex Stainless Steel Tube Manufacturers and Wholesale S32750 Super Duplex Stainless Steel Tube 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 & Maintenance Tips
Precise Welding
Requires nitrogen-containing shielding gas and specific super duplex fillers (25.10.4.L).
Avoid Heat Aging
Do not use in service temperatures between 600°C-950°C to prevent Sigma phase embrittlement.
Value-Added Services
G48 Testing
Critical pitting temperature verification via ASTM G48.
Custom Length
Up to 24m for seamless subsea umbilical runs.
U-Bending
High-precision coiling for offshore heat exchangers.
Logistics & Terms
30% T/T / L/C. Reinforced seaworthy crates with VCI protection and individual tube capping for deep-sea project delivery.
Standards
ASTM A789/790
NACE MR0175
NORSOK M-650
PED/ISO
Frequently Asked Questions
What is S32750 Super Duplex?
It is a high-alloy duplex stainless steel with a PREN ≥ 40, designed for extremely corrosive seawater and chemical service.
How does it differ from 2205?
S32750 has higher chromium, molybdenum, and nitrogen, providing better strength and pitting resistance than 2205.
What is the PREN of S32750?
It is typically calculated as Cr + 3.3Mo + 16N, and for S32750, it must be ≥ 40.
Is it magnetic?
Yes, like all duplex steels, it contains a significant amount of the ferritic phase.
Can it handle high temperatures?
Service is limited to below 300°C to prevent 475°C embrittlement of the ferritic phase.
What is NORSOK M-650?
It is a rigorous Norwegian standard for the qualification of manufacturers for special alloys like Super Duplex.
Is it suitable for H2S service?
Yes, it fully complies with NACE MR0175 for sour service oil and gas environments.
How do you test for Sigma phase?
Through metallographic examination (ASTM E562) and impact testing at -46°C.
Typical lead time?
Due to complex processing, lead time is usually 30-45 days.
Do you provide G48 corrosion testing?
Yes, ASTM G48 Method A ferric chloride pitting testing is available upon request.
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Contact our subsea specialists for S32750 technical support and project pricing.
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