Super Duplex UNS S32750 Fasteners Suppliers & Exporters in Europe, USA and Gulf Countries
Super Duplex UNS S32750 fasteners, also known as Alloy 2507 or SAF 2507, are designed for severe chloride-rich environments where high strength and corrosion resistance are critical. With a PREN value above 40, the grade provides strong resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
Aurum Overseas supplies S32750 fasteners for offshore platforms, subsea systems, desalination plants, petrochemical facilities, chemical processing, and high-pressure marine applications. Products are manufactured to applicable ASTM, ASME, EN, DIN, and NACE requirements with traceability and certification support.
Aurum Overseas supplies Super Duplex S32750 fasteners to major international markets including the USA, Canada, Mexico, UAE, Saudi Arabia, Germany, France, Italy, Spain, Netherlands, Qatar, and Oman, supporting EPC contractors, manufacturers, distributors, and industrial buyers with reliable export supply.
Super Duplex S32750 Fasteners Specifications and Standards
Super Duplex S32750 is identified as UNS S32750 / EN 1.4410, with high strength and strong resistance to localized corrosion.
| Specification Type | Standards / Grades |
|---|---|
| UNS Designation | UNS S32750 |
| EN / Werkstoff | 1.4410 |
| Common Trade Name | SAF 2507 |
| ASTM Forged Grade | ASTM A182 F51/F53* |
| Bar Specifications | ASTM A276 / ASTM A479 |
| Bolting Standards | ASTM A193 / ASTM A194 |
| NACE Requirements | NACE MR0175 / ISO 15156 |
| ASME Standards | ASME SA182 / SA479 |
| DIN Standards | DIN 931 / 933 / 912 / 934 |
| ISO Standards | ISO 4014 / 4017 / 4032 |
*Use the applicable ASTM grade specified for the project and product form.
Super Duplex S32750 Fasteners Sizes, Threads and Types
S32750 fasteners are available in metric and imperial sizes, with custom dimensions and machining available for project requirements.
Available Fastener Types
Bolts
Studs
Nuts
Washers
Screws
Threaded Bar
| Thread Standard | Availability |
|---|---|
| Metric Coarse | Standard |
| Metric Fine | Available |
| UNC | Available |
| UNF | Available |
| BSW | Custom Supply |
| Rolled Threads | Preferred for High-Strength Applications |
| Cut Threads | Available for Large Diameters |
| Supply Range | Availability |
|---|---|
| Metric Sizes | M3 to M56 |
| Extended Sizes | Beyond M100 on Request |
| Imperial Sizes | 3/8" to 2"+ |
| Threaded Rods | Up to 5 Meter Length |
| Custom Lengths | Available |
| Custom Head Geometry | Available |
| Drawing-Based Machining | Available |
Rolled threads can be supplied for high-strength and dynamic applications where improved fatigue performance and consistent grain flow are required.
Chemical Composition and PREN of Super Duplex S32750 Fasteners
S32750 combines high chromium, molybdenum, and nitrogen content for strong chloride and seawater corrosion resistance.
PREN = %Cr + 3.3(%Mo) + 16(%N)
Chemical Composition of UNS S32750
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | – | 0.030 |
| Manganese (Mn) | – | 2.00 |
| Silicon (Si) | – | 1.00 |
| Phosphorus (P) | – | 0.030 |
| Sulfur (S) | – | 0.020 |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 5.0 |
| Nitrogen (N) | 0.24 | 0.32 |
| Iron (Fe) | Balance | Balance |
Super Duplex S32750 Fasteners for Chloride and Seawater Service
The combination of chromium, molybdenum, and nitrogen improves passive film stability and localized corrosion resistance. This makes S32750 suitable for continuous seawater exposure, offshore splash zones, desalination equipment, and aggressive chloride process systems.
| Property | S32750 | 316L | Duplex 2205 |
|---|---|---|---|
| Yield Strength | High | Low | Medium |
| PREN | >40 | ~25 | ~35 |
| SCC Resistance | Excellent | Poor | Good |
| Chloride Resistance | Excellent | Fair | Good |
Mechanical and Physical Properties of Super Duplex S32750 Fasteners
S32750 provides substantially higher yield strength than conventional austenitic stainless steels such as 316L. Its duplex structure combines strength and ductility for offshore, subsea, pressure, and dynamic-loading applications.
Mechanical Properties of UNS S32750
| Property | Value |
|---|---|
| Tensile Strength | 800–1000 MPa |
| Yield Strength (0.2% Offset) | ≥ 550 MPa |
| Elongation | ≥ 15–25% |
| Hardness | ≤ 310 HB |
| Impact Toughness | High; excellent low-temperature performance |
Physical Properties of Super Duplex S32750
| Property | Value |
|---|---|
| Density | ~7.8 g/cm³ |
| Melting Range | 1350–1460°C |
| Thermal Conductivity | Higher than austenitic grades |
| Thermal Expansion | Lower than 316L |
| Modulus of Elasticity | ~200 GPa |
The lower thermal expansion and high stiffness of S32750 support applications involving thermal cycling, including heat exchangers and desalination systems.
ASTM G48, ASTM A923 and Quality Testing
Super Duplex S32750 fasteners can undergo metallurgical and corrosion testing to verify material quality and resistance to aggressive service conditions. ASTM G48 testing evaluates pitting and crevice corrosion resistance, while ASTM A923 testing helps identify detrimental intermetallic phases.
| Quality Requirement | Standard / Method | Purpose |
|---|---|---|
| Pitting Corrosion | ASTM G48 | Corrosion resistance verification |
| Metallurgical Verification | ASTM A923 | Detection of detrimental phases |
| PMI | Positive Material Identification | Alloy verification |
| Hardness Testing | Project / NACE Requirements | Service qualification |
| Tensile Testing | Applicable ASTM Standard | Mechanical verification |
| Certification | EN 10204 3.1 / 3.2 | Material traceability |
| Third-Party Inspection | As Required | Independent verification |
Super Duplex S32750 Fasteners for Offshore and Industrial Projects
S32750 is widely used where high strength and resistance to chloride corrosion are required. Typical applications include offshore platforms, subsea equipment, desalination plants, marine systems, chemical processing, and high-pressure piping.
Aurum Overseas supports project procurement across Europe, the USA, and Gulf markets with custom machining, inspection documentation, export packaging, and international logistics.
- Offshore platforms
- Subsea equipment
- Desalination plants
- Marine systems
- Chemical processing
- High-pressure piping
- Petrochemical facilities
- Seawater systems
Global Export Markets
Aurum Overseas supplies its products to major industrial and engineering markets worldwide, supporting EPC contractors, manufacturers, distributors, and industrial buyers with reliable supply and export logistics.
USA
Canada
Mexico
UAE
Saudi
Arabia
Germany
France
Italy
Spain
Netherlands
Belgium
Poland
Qatar
Oman
Kuwait
Bahrain
Fabrication, Machining and Heat Treatment
Super Duplex S32750 fasteners require controlled manufacturing and heat treatment to maintain the required duplex phase balance and corrosion resistance. Solution annealing and rapid cooling are used according to the applicable material specification and project requirements.
Custom forging, machining, threaded rods, special dimensions, and drawing-based fasteners can be supplied for offshore and industrial projects. Export shipments can include seaworthy packaging, ISPM-15-compliant wooden packaging where applicable, and FOB, CIF, or DDP logistics support.
Super Duplex S32750 vs S32760 Fasteners
S32750 and S32760 are closely related Super Duplex grades designed for high-strength and chloride-resistant service. S32750 is widely used for offshore, seawater, desalination, and chemical applications, while S32760 includes additional tungsten and copper alloying and can be selected for particularly demanding localized corrosion environments.
For applications requiring enhanced offshore and subsea corrosion performance, Super Duplex S32760 Fasteners can be considered where the project specification calls for the higher-alloyed grade.
| Comparison Factor | S32750 | S32760 |
|---|---|---|
| Stainless Steel Type | Super Duplex | Super Duplex |
| PREN | >40 | >40 |
| Tungsten Addition | No | Yes |
| Copper Addition | Lower / Controlled | Higher |
| Chloride Resistance | Excellent | Superior in severe conditions |
| Typical Applications | Offshore, desalination, marine | Critical offshore and subsea |
| Best Suited For | High-strength chloride service | More aggressive localized corrosion conditions |
Export Packaging, Certification and Global Logistics
Super Duplex S32750 fasteners can be supplied with documentation and protective packaging suited to international industrial shipments. Traceability is maintained through heat numbers and applicable inspection records.
| Documentation | Availability |
|---|---|
| EN 10204 3.1 | Available |
| EN 10204 3.2 | Available on Request |
| PMI Reports | Available |
| Material Traceability | Available |
| Third-Party Inspection | Available on Request |
| Heat Treatment Records | As Required |
| Packaging Type | Application |
|---|---|
| Wooden Export Crates | Marine Transport |
| Fumigated Packaging | International Export |
| Waterproof Packing | Offshore Shipments |
| Heat Number Marking | Full Traceability |
| Custom Project Packing | Available |
FAQs – Super Duplex S32750 Suppliers & Exporters
S32760 has additional alloying elements like tungsten and copper, which give it slightly higher corrosion resistance in very aggressive environments. S32750 is more widely used for general offshore and seawater applications, while S32760 is preferred for highly corrosive or critical subsea conditions.
Yes, UNS S32750 is specifically designed for seawater and offshore service. Its duplex structure provides excellent resistance to chloride stress corrosion cracking and pitting, making it reliable for platforms, desalination plants, and marine piping systems.
Alloy 2507 (S32750) generally has a PREN value above 40, which classifies it as a super duplex grade with very strong resistance to pitting and crevice corrosion, especially in chloride-rich environments like seawater.
Yes, S32750 can comply with NACE MR0175 / ISO 15156 when it meets required hardness limits and proper heat treatment conditions. This makes it suitable for sour service oil & gas environments containing hydrogen sulfide (H₂S), depending on project specifications.
SAF 2507 fasteners are used in offshore oil & gas, marine engineering, desalination plants, chemical processing, and subsea systems. They are chosen where high strength and strong resistance to chloride corrosion are required for long-term reliability.
Yes, S32750 fasteners can be supplied with EN 10204 3.2 certification on request. This includes third-party inspection and full traceability of chemical composition, mechanical properties, and heat treatment, making it suitable for critical industrial and offshore projects.
Request a Quote for Super Duplex UNS S32750 Fasteners
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Contact us for a quotation based on your specifications, quantity, and delivery location.
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