Super Duplex 2507 Properties and Chemical Composition – UNS S32750 / EN 1.4410
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Meta Description: Explore Super Duplex 2507 properties, chemical composition, mechanical strength and corrosion resistance. Learn about UNS S32750 and EN 1.4410 for industrial use.
Table of Contents
- What Is Super Duplex 2507?
- Super Duplex 2507 Equivalent Grades and Designations
- Super Duplex 2507 Chemical Composition
- Mechanical Properties of UNS S32750
- Corrosion Resistance of EN 1.4410
- Industrial Applications of Super Duplex 2507
- Important Factors When Selecting Super Duplex 2507
- Frequently Asked Questions
- Enquire About Super Duplex 2507 from Manan Steel & Metals
1. What Is Super Duplex 2507?
Super Duplex 2507 is a high-alloy duplex stainless steel designed for demanding industrial environments where high mechanical strength and resistance to corrosion are important. It has a mixed austenitic-ferritic microstructure and is commonly identified by its UNS designation S32750 and European material number 1.4410.
The grade contains significant amounts of chromium, nickel, molybdenum and nitrogen. This alloying combination contributes to its strength and resistance to localized corrosion, including pitting and crevice corrosion in suitable chloride-containing environments.
Industries such as oil and gas, chemical processing, desalination, marine engineering and petrochemical manufacturing use Super Duplex 2507 for selected components exposed to aggressive operating conditions.
For buyers searching for Super Duplex 2507 properties, understanding its composition, mechanical characteristics and service limitations helps determine whether the material is suitable for a specific application.
2. Super Duplex 2507 Equivalent Grades and Designations
Super Duplex 2507 may appear under different designations in international material specifications and supplier catalogues.
| Designation | Material identification |
|---|---|
| Super Duplex 2507 | Common grade name |
| UNS S32750 | Unified Numbering System designation |
| EN 1.4410 | European material number |
| X2CrNiMoN25-7-4 | European grade designation |
| ASTM A479 / ASME SA-479 | Bar and related product specification, where applicable |
| ASTM A240 | Plate, sheet and strip specification, where applicable |
| ASTM A182 / ASME SA-182 | Forged or rolled alloy and stainless-steel piping components, where applicable |
Important: Material grade identification and product standards are not interchangeable. The applicable specification depends on whether the requirement is for a round bar, plate, pipe, fitting, flange or forging. Confirm the required standard, grade, dimensions and certification before ordering.
For technical reference, consult Alleima’s SAF 2507 bar datasheet.
3. Super Duplex 2507 Chemical Composition
The chemical composition of Super Duplex 2507 is central to its mechanical strength and corrosion performance.
The following values are representative of the nominal composition and limits published for SAF 2507 by Alleima. Confirm the exact requirements against the governing product specification and material test certificate.
| Element | Typical specification, weight % |
|---|---|
| Chromium (Cr) | Approximately 25% |
| Nickel (Ni) | Approximately 7% |
| Molybdenum (Mo) | Approximately 4% |
| Nitrogen (N) | Approximately 0.3% |
| Carbon (C) | Maximum 0.030% |
| Silicon (Si) | Maximum 0.8% |
| Manganese (Mn) | Maximum 1.2% |
| Phosphorus (P) | Maximum 0.035% |
| Sulphur (S) | Maximum 0.015% |
| Copper (Cu) | Maximum 0.5% |
Note: These are reference values from a manufacturer datasheet, not a substitute for the chemical analysis of a supplied heat or batch.
Why does the composition matter?
- Chromium: Supports the passive surface layer responsible for stainless steel’s corrosion resistance.
- Nickel: Helps maintain the austenitic phase in the duplex microstructure.
- Molybdenum: Improves resistance to pitting and crevice corrosion in suitable environments.
- Nitrogen: Contributes to strength and localized corrosion resistance.
- Low carbon content: Helps limit certain carbide-related problems during suitable processing and welding.
The balance of these elements makes UNS S32750 useful in applications that require more than ordinary stainless steel can provide.
Reference: Alleima SAF 2507 material datasheet.
4. Mechanical Properties of UNS S32750
Super Duplex 2507 is known for its high mechanical strength. This can support engineering designs where load-bearing capacity and corrosion resistance are both important.
For example, Alleima lists the following typical minimum or specified values for its bar product in the solution-annealed and quenched condition:
| Mechanical property | Reference value |
|---|---|
| 0.2% proof strength | Minimum 550 MPa |
| Tensile strength | 760–930 MPa |
| Elongation | At least 25% |
These figures are product- and condition-specific reference values. They should not be applied automatically to every Super Duplex 2507 form or dimension. Actual acceptance criteria depend on the applicable standard, heat treatment, section size and test requirements.
Key mechanical characteristics
- High strength compared with many conventional austenitic stainless steels.
- Good resistance to erosion corrosion and corrosion fatigue in suitable service conditions.
- Useful strength-to-weight characteristics for selected engineering designs.
- Good weldability when appropriate procedures and controls are followed.
Material selection should consider operating temperature, pressure, loading, fabrication method and the requirements of the relevant design code.
5. Corrosion Resistance of EN 1.4410
One of the primary reasons for specifying Super Duplex 2507 is its resistance to several forms of corrosion in demanding environments.
Pitting and crevice corrosion
Its chromium, molybdenum and nitrogen content contributes to resistance against localized corrosion, particularly in chloride-bearing environments. This can be valuable in seawater systems and industrial equipment exposed to saline process fluids.
Chloride stress-corrosion cracking
Super Duplex 2507 offers strong resistance to chloride stress-corrosion cracking under appropriate service conditions. Nevertheless, temperature, stress, chloride concentration and the presence of other chemicals can affect actual performance.
General corrosion
The grade also provides resistance to general corrosion in selected chemical environments. Suitability must be confirmed for the specific fluid composition, concentration, temperature and operating conditions.
Do not treat Super Duplex 2507 as universally corrosion-proof. Material selection should be based on the real service environment and relevant testing or engineering guidance.
6. Industrial Applications of Super Duplex 2507
The combination of high strength and corrosion resistance makes Super Duplex 2507 relevant to several industrial sectors.
- Oil and gas: Selected process components, piping systems and equipment operating in demanding environments.
- Desalination: Components exposed to saline water and chloride-containing process streams.
- Marine engineering: Selected seawater-handling equipment and marine installations.
- Chemical processing: Equipment exposed to compatible aggressive process media.
- Petrochemical plants and refineries: Components requiring suitable mechanical strength and corrosion resistance.
- Heat exchangers and cooling systems: Applications where chloride exposure and operating conditions justify the grade.
- Industrial machinery: High-strength components designed for suitable corrosive environments.
The correct product form and specification must be selected for each application.
7. Important Factors When Selecting Super Duplex 2507
Before purchasing Super Duplex 2507, industrial buyers should confirm the following details:
- Product form: Round bar, plate, sheet, pipe, fitting, flange or forging.
- Grade designation: Confirm UNS S32750 and the required corresponding standard.
- Dimensions: Specify diameter, thickness, length and tolerances.
- Material condition: Confirm the required heat-treatment condition and mechanical properties.
- Certification: State whether an EN 10204 Type 3.1 material test certificate or other documentation is required.
- Operating environment: Provide details of temperature, pressure, chloride concentration and process chemicals.
- Quantity and delivery: Confirm quantity, destination and required delivery schedule.
These checks help reduce the risk of ordering a material that does not meet the engineering requirement.
8. Frequently Asked Questions
What is Super Duplex 2507?
Super Duplex 2507 is a high-alloy duplex stainless steel designed to combine high mechanical strength with strong corrosion resistance in suitable demanding environments.
What is the UNS number of Super Duplex 2507?
The UNS designation is S32750.
What is the EN number for Super Duplex 2507?
The European material number is 1.4410, and the corresponding grade designation is X2CrNiMoN25-7-4.
What is the chemical composition of Super Duplex 2507?
Its principal alloying elements are approximately 25% chromium, 7% nickel, 4% molybdenum and 0.3% nitrogen, subject to the applicable specification and certified chemical analysis.
Is Super Duplex 2507 suitable for seawater?
It can be suitable for selected seawater applications because of its resistance to chloride-related localized corrosion. Suitability depends on seawater temperature, flow, deposits, crevices, fabrication quality and operating conditions.
Which standards apply to Super Duplex 2507?
The applicable standard depends on the product form. Examples include ASTM A479 for bars, ASTM A240 for plate and sheet, and ASTM A182 for applicable forged piping components. Always verify the exact grade and product standard.
Where can I enquire about Super Duplex 2507 in India?
Industrial buyers can contact Manan Steel & Metals to discuss their required grade, product form, dimensions, quantity and documentation.
9. Enquire About Super Duplex 2507 from Manan Steel & Metals
Looking for Super Duplex 2507 (UNS S32750 / EN 1.4410) for an industrial or engineering requirement?
Manan Steel & Metals supports industrial material enquiries. Share your required product form, dimensions, quantity, applicable standard and certification requirements so availability and suitability can be discussed.
Contact Manan Steel & Metals
- Website: https://www.manansteel.com/
- Phone: +91 7977369869
- Email: manansteel@gmail.com
- Address: Shop No. 2, Hira Building, 97 Khetwadi Main Road, Girgaon, Mumbai – 400004, Maharashtra, India.
Send your material requirement for an enquiry.
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