Materials · Duplex
Super duplex S32760 bolts and studs
Super duplex S32760 bolts, stud bolts, nuts and machined parts in Zeron 100 and F55, made to your drawing in Willenhall for subsea, offshore, process and seawater systems.
F55
Also UNS S32760, 1.4501 and Zeron 100
725 MPa
Minimum yield, fastener grade FG
PREN > 40
Pitting resistance for seawater
1 to 500
Prototypes to batches of several hundred
About the alloy
The super duplex developed for the North Sea
HAGUE FASTENERS makes super duplex S32760 bolts, studs and nuts in the UK, including Zeron 100 in solution annealed (SA), fastener grade (FG) and fastener low temperature (FLT) conditions. It was first developed as a cast material for North Sea seawater pumps.
The FG condition has the tensile properties of ASTM A193 B7 plus Charpy impacts, and FLT those of A320 L7.
At a glance
- 25% chromium super duplex with copper and tungsten
- Zeron 100 SA, FG and FLT conditions
- FG and FLT meet NACE MR0175 / ISO 15156-3 at max. 36 HRC
- NORSOK M630 MDS D57
Composition
Super duplex S32760 chemical composition
Percentage by weight. PREN = %Cr + 3.3 x %Mo + 16 x %N; ZERON 100 PREN > 40.
| Element | Min % | Max % |
|---|---|---|
| Nickel (Ni) | 6.00 | 8.00 |
| Molybdenum (Mo) | 3.00 | 4.00 |
| Silicon (Si) | – | 1.00 |
| Chromium (Cr) | 24.00 | 26.00 |
| Carbon (C) | – | 0.03 |
| Manganese (Mn) | – | 1.00 |
| Nitrogen (N) | 0.20 | 0.30 |
| Sulphur (S) | – | 0.010 |
| Phosphorus (P) | – | 0.030 |
| Copper (Cu) | 0.50 | 1.00 |
| Tungsten (W) | 0.50 | 1.00 |
| Iron (Fe) | – | Bal. |
Properties
Mechanical properties
Minimum values. Strength in MPa, elongation and reduction of area in %.
| Property | Solution annealed S32760 (Zeron 100) SA | Fastener grade S32760 (Zeron 100) FG | Fastener low temperature S32760 (Zeron 100) FLT |
|---|---|---|---|
| Tensile strength, min. | 800 | 860 | 860 |
| Yield strength (0.2% offset), min. | 550 | 725 | 725 |
| Elongation in 2 in (50 mm) or 4D, min. | 25 | 16 | 16 |
| Reduction of area, min. | 50 | 50 | 50 |
| Charpy V-notch impact energy | 70J ave. at -46°C | 40J ave. at -46°C | 27J ave. at -101°C |
| Notes | Max. 28HRC meets NACE MR0103-2005 for Solution Annealed condition | Tensile properties of ASTM A193 B7, plus Charpy impacts. Max 36HRC meets NACE MR0175 / ISO15156-3 | Tensile properties plus Charpy impacts of ASTM A320 L7. Max 36HRC meets NACE MR0175 / ISO15156-3 |
This data is for general information only and may change without notice. HAGUE FASTENERS LIMITED believes it to be accurate but gives no warranty as to its accuracy or completeness and accepts no liability for its use. Actual properties may vary, and nothing here guarantees suitability for a particular use.
Equivalents and applications
Super duplex S32760 equivalents and typical uses
Alternative designations
1.4501, X2CrNiMoCuWN25.7.4, Z3CND25.06Az, UNS S32760, F55 (A182 / A276 / A479), Zeron 100SA, Zeron 100FG, Zeron 100 FLT, Fastener Grade, Fastener Low Temperature, Norsok M630 MDS D57, NACE MR01-75, ISO 15156, EN 10088-3, PED 2014/68/EU, ASTM G48 Method A, ASTM A751 composition, ASTM A388 U/T, API 6A PSL 4.
Typical applications
- Process, seawater, firewater and subsea pipework
- Risers, manifolds, pressure vessels, valves and heat exchangers
- Flue gas desulphurisation and pollution control
- Pulp and paper, power generation, chemical and pharmaceutical plant
- Desalination, mining, metallurgical and marine service
What we make
Fasteners we make in Super duplex S32760
Certification and testing
Certified, traceable and tested
Bar comes from approved UK, EU or US mills, with heat numbers carried through to release. Testing is by independent UKAS-accredited laboratories, with EN 10204 3.1 or 3.2 certificates as required. See quality and testing.
- Mill certificates and heat traceability
- PMI and chemical analysis
- Solution annealing by approved partners, with furnace charts
- Laser-marked heat codes or part numbers
Questions
Frequently asked questions
What is the equivalent of super duplex S32760?
Super duplex S32760 is F55, 1.4501 and X2CrNiMoCuWN25.7.4, and is widely supplied as Zeron 100.
What is Zeron 100 FG?
Zeron 100 FG is the fastener grade condition of S32760, with the tensile properties of ASTM A193 B7 plus Charpy impact testing.
Can super duplex S32760 bolts replace B7 studs?
Often, yes. Super duplex S32760 bolts in FG condition match B7 tensile properties and add far better corrosion resistance, but the whole joint should be reviewed before changing.
Are S32760 fasteners suitable for low temperatures?
Yes. The FLT condition is impact tested to 27 J average at -101°C, with the tensile properties of A320 L7.
Super duplex S32760 enquiry?
Send us your drawing or specification
Tell us the sizes, quantity, thread, condition and documentation you need, and we will come back to you quickly.