Description
High-alloy super duplex stainless steel
Super Duplex 2507 Threaded Rod
High-strength, high-PREN stainless threaded bar for offshore, seawater, desalination and aggressive chloride-service assemblies.
Product overview
Super Duplex 2507 threaded rod is manufactured from UNS S32750 ferritic-austenitic stainless steel. Its high chromium, molybdenum and nitrogen content provides high strength and strong resistance to chloride pitting, crevice corrosion and stress-corrosion cracking.
ASTM A276 or ASTM A479 bar may be specified depending on the application. The finished rod order should control solution heat treatment, exact UNS grade, dimensions, thread form, surface condition, phase balance and any project corrosion testing.
Super Duplex 2507 threaded rod specifications
| Material designation | Super Duplex 2507 / UNS S32750 / EN 1.4410 |
|---|---|
| Starting material | ASTM A276 or ASTM A479 bar, as specified |
| Condition | Solution annealed, rapidly cooled and descaled |
| Thread systems | ASME B1.1 UNC/UNF/8UN; ASME B1.13M / ISO metric |
| Size range | 1/4–4 in and M6–M100 typical; size and property review required |
| Surface | Clean machined, pickled/passivated or project-specified finish |
| Matching hardware | UNS S32750 or engineer-approved compatible nuts and washers |
| Inspection | EN 10204 3.1, PMI, dimensions, ferrite and ASTM G48 / project tests when ordered |
Final dimensions, tolerances, heat treatment, coating, testing and acceptance criteria follow the confirmed purchase order and the applicable standard edition. Availability depends on diameter, length, thread form and production quantity.
Why specify this material?
2507 is considered for chloride conditions beyond the practical range of 2205, especially offshore, desalination and seawater equipment. Nickel alloys may still be preferable in severe acid, high-temperature or complex mixed-chemical environments.
Engineering note
Super duplex performance relies on controlled chemistry and solution treatment. Exposure to unsuitable heat-treatment or fabrication temperatures can form detrimental phases. Specify ferrite, microstructure and corrosion-test requirements before production.
Typical applications
Quality, inspection and documentation
S32750 supply should retain heat-treatment and heat-number traceability through threading. PMI, ferrite measurement, microstructure review and ASTM G48 or project corrosion testing may be specified for critical service.
- EN 10204 3.1 material test certificate
- Heat-number and batch traceability
- Chemical composition and mechanical properties
- Dimensional inspection and thread gauging
- PMI for stainless and nickel alloys when ordered
- Coating thickness or surface inspection when applicable
- Third-party inspection and additional testing by agreement
- Export marking and seaworthy packing
Information required for quotation
- Material grade, governing material/bolting standard and required edition
- Diameter, thread series, pitch and thread class or tolerance
- Overall length, cut-end requirements and quantity
- Heat treatment, surface finish or coating system
- Matching nuts and washers, including anti-galling requirements
- Inspection plan, MTC, PMI, NDE and third-party witness requirements
- Delivery destination, packaging and required schedule
Frequently asked questions
What is Super Duplex 2507?
2507 is the common name for UNS S32750 high-alloy duplex stainless steel with high strength and strong chloride pitting and crevice-corrosion resistance.
How does 2507 differ from Duplex 2205?
2507 contains more chromium, molybdenum and nitrogen, giving higher strength and chloride-corrosion resistance. It also requires tighter fabrication and heat-treatment control.
Which tests are common for 2507 threaded rod?
PMI, ferrite measurement, mechanical testing and thread inspection are common. ASTM G48 corrosion testing and microstructure examination may be added by the project.
Is 2507 always suitable for seawater?
It is widely used in seawater service, but temperature, chlorination, crevices, deposits, flow and galvanic coupling still require engineering evaluation.
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Request a technical quotation
Send your bill of materials, drawing or project specification. SASA FLANGE will review the grade, thread, dimensions, documentation and delivery requirements before quotation.
