Duplex Steel Fasteners
Ferritic-austenitic stainless steels with roughly equal phase balance, giving about twice the yield strength of 304/316 with good chloride stress corrosion cracking resistance.
Duplex Steel Fasteners
Ferritic-austenitic stainless steels with roughly equal phase balance, giving about twice the yield strength of 304/316 with good chloride stress corrosion cracking resistance.
Common standards: ASTM A276, A479, A182 F51/F60, NACE MR0175 / ISO 15156 where specified
Common Grades
| Grade | Description |
|---|---|
| S31803 / S32205 | 22Cr duplex (1.4462), most common duplex grade |
| S32304 | Lean duplex (1.4362), PREN lower than 2205 |
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 |
|---|---|---|---|---|---|
| S31803 | ≤0.030 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
| S32205 | ≤0.030 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
| S32304 | ≤0.030 | 21.5–24.5 | 3.0–5.5 | 0.05–0.60 | 0.05–0.20 |
Limits vary slightly by product standard. Actual heat analysis is reported on the Material Test Certificate.
Mechanical Properties
| UNS | Tensile (MPa) | Yield (MPa) | Note |
|---|---|---|---|
| S31803 | 620 min | 450 min | Per ASTM A276/A479 |
| S32205 | 655 min | 450 min | Per ASTM A276/A479 |
| S32304 | 600 min | 400 min | Per ASTM A276/A479 |
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.