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Duplex (S31803 / F51) is a high-tensile stainless steel that is in common use in the Petro-chemical, Oil & Gas and Offshore Industries. It has great mechanical strength in addition to high resistance to corrosion. It is commonly used in marine environments where elevated corrosion resistance is required as compared to standard grades of stainless steel, such as 316 / A4.
At Bolt King, we are adept at manufacturing Duplex fasteners, and are one of the few manufacturers in the UK with the expertise to hot-forge Duplex bolts and nuts on-site. Our current range for hot-forging these products is M6 - M45.
If you have any questions or queries with regard to Duplex bolting, please contact us.
Chemical Properties
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu | W | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Min |
- | - | - | - | 0.20 | 21.0 | 4.5 | 3.0 | 0.14 | - | - | - |
| Max | 0.03 | 2.0 | 0.03 | 0.00 | 0.70 | 23.0 | 6.5 | 3.5 | 0.20 | - | - | Bal |
Mechanical Properties
| Ultimate Tensile Strength (Min) | Yield Strength (Min) | Elongation (Min) | RoA (Min)> | Hardness |
|---|---|---|---|---|
| 620 MPa | 450 MPa | 25 | - | 290 HBN Max |
The information provided above is for reference only. Please contact us for further information.
Special Fasteners In Exotic Alloys, Including
Inconel & Super Duplex
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