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| UNS Number | S32750 |
|---|---|
| DIN/Werkstoff Number | 1.4410 |
| ASTM/ASME Standard | A182 / A479 / F467 / F468 |
| Tensile Strength | 795 MPa min |
| Density | 7.80 g/cm³ |
| Max Service Temperature | 300°C |
| Element | Composition (%) |
|---|---|
| Cr | 24.0–26.0 |
| Ni | 6.0–8.0 |
| Mo | 3.0–5.0 |
| N | 0.24–0.32 |
| Mn | ≤1.2 |
| C | ≤0.030 |
| Fe | bal |
Super Duplex 2507 fasteners derive their exceptional performance from a carefully balanced chemical composition featuring high chromium (24-26%), nickel (6-8%), molybdenum (3-5%) and controlled nitrogen additions (0.24-0.32%). Chromium provides the foundation for passive film formation and oxidation resistance, while molybdenum significantly enhances resistance to pitting and crevice corrosion in chloride-rich environments. Nickel stabilises the austenitic phase within the duplex microstructure, ensuring an optimal balance between austenite and ferrite. Nitrogen further strengthens the alloy matrix while improving resistance to localised corrosion attack.
This precise metallurgical balance delivers outstanding engineering benefits, including a Pitting Resistance Equivalent Number exceeding 42, making it ideal for aggressive marine, offshore and chemical processing environments. The duplex structure provides superior mechanical strength, roughly double that of standard austenitic stainless steels, allowing for reduced fastener sizing without compromising safety. Excellent resistance to stress corrosion cracking, chloride attack and sulphide stress cracking further enhances reliability in critical bolting applications, making Super Duplex 2507 fasteners the preferred choice for demanding subsea, petrochemical and desalination industries.
Specifications
Super Duplex 2507 Fasteners are defined by high-strength mechanical properties, corrosion-resistant technical performance, and precise dimensional specifications for demanding service environments. Their specification profile covers alloy composition, load-bearing capacity, thread and size tolerances, and relevant industry standard requirements for reliable fastening applications.
| Property | Value |
|---|---|
| Tensile Strength | 795 MPa min |
| Yield Strength (0.2% Offset) | 550 MPa min |
| Elongation | 15% min |
| Hardness | 32 HRC max |
| Modulus of Elasticity | 205 GPa |
| Thermal Conductivity | 17 W/m·K |
| Density | 7.80 g/cm³ |
| Melting Range | 1350-1400°C |
| Max Service Temperature | 300°C |
| Standard | Details |
|---|---|
| Bolt Standard | ASTM A182, F468, DIN 931/933 |
| Stud Bolt Standard | ASTM A182, API 20SM |
| Nut Standard | ASTM A194, F467, DIN 934 |
| Washer Standard | ASTM F436, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 to M100 / 1/4" to 4" |
| Length Range | 10mm to 500mm (custom available) |
| Manufacturing Standards | ISO 9001, PED 2014/68/EU, NACE MR0175 |
| Inspection Standards | EN 10204 3.1/3.2, NDT, PMI Testing |
Applications
