Super Duplex Steel Fasteners
Highly alloyed duplex stainless steels (PREN above 40) for severe chloride and sour environments, offering higher strength and pitting resistance than standard duplex.
Super Duplex Steel Fasteners
Highly alloyed duplex stainless steels (PREN above 40) for severe chloride and sour environments, offering higher strength and pitting resistance than standard duplex.
Common standards: ASTM A276, A479, A182 F53/F55, NACE MR0175 / ISO 15156 where specified
Common Grades
| Grade | Description |
|---|---|
| S32750 | 2507 (1.4410), widely used in subsea and offshore |
| S32760 | Cu and W alloyed super duplex (1.4501) |
| S32550 | Cu-bearing super duplex |
General industry information. Grades listed are not a statement of current stock or manufacture; availability is confirmed at enquiry.
Chemical Composition (% typical specification limits)
| UNS | C | Cr | Ni | Mo | N |
|---|---|---|---|---|---|
| S32750 | ≤0.030 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 |
| S32760 | ≤0.030 | 24.0–26.0 | 6.0–8.0 | 3.0–4.0 | 0.20–0.30 |
| S32550 | ≤0.040 | 24.0–27.0 | 4.5–6.5 | 2.9–3.9 | 0.10–0.25 |
Limits vary slightly by product standard. Actual heat analysis is reported on the Material Test Certificate.
Mechanical Properties
| UNS | Tensile (MPa) | Yield (MPa) | Note |
|---|---|---|---|
| S32750 | 800 min | 550 min | Per ASTM A276 |
| S32760 | 750 min | 550 min | Per ASTM A276 |
| S32550 | 760 min | 550 min | Per ASTM A276 |
Minimum values per cited standards; they vary by diameter, condition and heat treatment.
Available Fastener Types
Available as bolts, nuts, screws, washers, studs and special fasteners to drawing, subject to size and standard. Browse all products.
Applications and Industries
Finishing, Quality and Packaging
Finishes such as passivation, plating, galvanizing or customer-specified treatments are selected to suit the material and service. Inspection may include dimensional, visual, mechanical and chemical checks, PMI where applicable, and Material Test Certificates (EN 10204 3.1 where requested). Goods are packed for export. See Quality.