The super duplex steel UNS S32750 is a high-alloy stainless steel pipe with a mixed structure of austenite and ferrite. This design provides more strength and much higher corrosion resistance than standard steel. It is one of the grades of super duplex steel pipes.
Seamless Super Duplex S32750 Pipe
UNS S32750 Seamless Pipe is a 25% chromium super duplex stainless steel grade manufactured by Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (XTD). Globally recognised under the UNS S32750 and EN 1.4410 classifications, this material is manufactured in accordance with ASTM A790. Also known as Super Duplex Steel S32750 Seamless Pipe, this grade contains approximately 25% chromium, 3.0–5.0% molybdenum, and 0.24–0.32% nitrogen, providing superior resistance to pitting and crevice corrosion compared to standard duplex grades. Its dual-phase austenitic-ferritic structure delivers high mechanical strength, while its seamless construction eliminates weld-related weak points, enhancing pressure integrity. Manufactured through solid billet piercing, extrusion, and heat treatment, S32750 pipe offers a Critical Pitting Temperature (CPT) exceeding 50°C in chloride environments and supports continuous service temperatures up to 300°C (572°F). These properties make it suitable for offshore oil and gas platforms, seawater desalination, marine equipment, chemical processing plants, and heat exchangers exposed to seawater or chloride-containing environments. XTD supplies S32750 pipes in various outer diameters, wall thicknesses, and lengths, with an annual production capacity of 25,000 tons, in-stock delivery within one week, and customised production lead times of 15–60 days.
Product Specification
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Standard ASTM A790 -
OD Range 6-720 mm -
Thickness 1 to 65 mm -
Length ≤ 18 m
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Technical Data
Technical Data
How ASTM A790 Super Duplex 2507 Seamless Pipes are Manufactured
As a leading seamless pipe manufacturer in China, we begin our manufacturing process with high-quality billets of SDSS 2507. We pierce the billet into a hollow shell, then roll and extrude it to accurate dimensional tolerances. Final steps include heat treatment, pickling, and inspection to ensure ASTM A790 compliance in our manufacturing process.
Key Features & Advantages of ASTM A790 UNS S32750 Seamless Pipe
Our ASTM A790 UNS S32750 Seamless Pipe offers the following key features and advantages, which are mentioned below:
- Corrosion Resistance: Our pipes contain high levels of chromium and molybdenum to prevent localised metal degradation in harsh fluids. This specific chemical composition resists corrosion in chloride-rich environments and acidic industrial systems where standard steel fails.
- High Strength: The yield strength of the dual ferrite-austenite microstructure is almost double that of standard austenitic grades. It ensures that the material can withstand high loads. This feature reduces the risk of distortion and failure in demanding applications.
- Excellent Pressure & Temperature Performance: Our pipes maintain reliable performance up to 300°C for continuous service, as recommended by ASTM standards. This reliability prevents leaks and failures in heavy-duty thermal systems and deep-sea extraction projects.
- Good Toughness: The super duplex structure ensures Alloy 2507 pipes do not become brittle in cold or stressed conditions. This toughness prevents the metal from cracking under heavy impact or sudden pressure shifts.
- Durability and Long Service Life: We use high-quality alloys that resist wear and erosion over many decades of constant use. This longevity reduces the need for frequent replacements and reduces the maintenance costs.
- Withstands Harsh Environments: Our 25 chrome super duplex resists stress corrosion cracking in environments with high chloride levels. This makes it the safest choice for offshore rigs and chemical plants facing aggressive atmospheric conditions.
- Cost-Effective: The high strength of Alloy 2507 reduces the cost of maintenance. Although the initial material cost is higher, the longer service life reduces maintenance costs over time.
What are the Equivalent Materials for UNS S32750 ASTM A790 Super Duplex 2507 Pipe?
The main equivalent designation for 2507 super duplex stainless steel pipe is SAF 2507, also known as Alloy 2507, which is designated by UNS S32750. Its common global equivalents include the EN/DIN number 1.4410 or X2CrNiMoN25-7-4 and by the French AFNOR Z3CND25.07Az.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 2507 | S32750 | S25073 | 022Cr25Ni7Mo4N | - | X2CrNiMoN25-7-4 | 1.4410 | — |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grainsize, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Industries & Applications for Super Duplex S32750 Pipe
UNS S32750 super duplex steel seamless (SMLS) pipes serve demanding industries like oil and gas, chemicals, marine, desalination, and heat exchangers. The following are the 5 key industries we serve:
Oil & Gas Industry
We supply this pipe for marine systems and flowlines, which carry raw hydrocarbons. It can withstand the high pressure and sour gases found deep in the ocean without corroding.
Chemical Processing Equipment
Our pipes are designed to be used for storage tanks and piping systems that contain strong acids and organic chemicals. The material prevents leaks in systems and can handle corrosive fluids at high temperatures.
Marine Engineering
We provide these for propeller shafts and cooling systems on large ocean vessels. In maritime areas, the alloy withstands the continuous corrosive assault of salt spray and flowing seawater.
Seawater Desalination Plant
This pipe is vital for high-pressure reverse osmosis pumps and membrane housings. It withstands the concentrated brine that typically destroys lower grades of stainless steel during water treatment.
Heat Exchangers
Our seamless pipes are used in shell and tube exchangers that transfer heat between corrosive liquids. The higher thermal conductivity relative to austenitic grades and strength ensure efficient energy transfer without pipe wall failure.
Frequently Asked Questions
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What is super duplex steel UNS S32750 pipe?
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What are the key properties of Super Duplex 2507 pipe?Key properties include high corrosion resistance, good temperature performance, pitting resistance over 50°C, strength above 550 MPa, and a 300°C service limit.
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What is the difference between the UNS S32750 and S32760 pipes?Both S32750 and S32760 are super duplex grades with similar base compositions. The key difference is that S32760 contains deliberate additions of copper (0.5–1.0%) and tungsten, which improve its resistance to sulfuric acid and certain reducing environments. S32750, by contrast, offers slightly higher tensile strength and is more commonly used in general offshore and chemical processing applications.
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How does S32750 pipe compare with regular duplexes, like 2205?S32750 offers better pitting resistance and strength than 2205. Higher Mo and N push critical pitting above 50°C versus 2205's lower limit.
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What temperature range can UNS S32750 seamless pipes handle?Our pipes function reliably from sub-zero temperatures (down to -50°C) up to a maximum of 300°C (572°F). Exceeding this temperature can reduce toughness and corrosion resistance due to phase precipitation.
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Is UNS S32750 seamless pipe suitable for seawater applications?Yes. The UNS S32750 seamless pipe performs well in seawater. It contains high amounts of molybdenum (Mo) and nitrogen (N), which offer excellent resistance to pitting and crevice corrosion in flowing seawater under controlled velocity conditions.
- How ASTM A790 Super Duplex 2507 Seamless Pipes are Manufactured
- Key Features & Advantages of ASTM A790 UNS S32750 Seamless Pipe
- What are the Equivalent Materials for UNS S32750 ASTM A790 Super Duplex 2507 Pipe?
- 100% Certified Testing & Documentation
- Industries & Applications for Super Duplex S32750 Pipe
- Frequently Asked Questions