Materials · Hastelloy
Hastelloy B2 fasteners
HAGUE FASTENERS makes Hastelloy B2 fasteners to order: bolts, studs, nuts and machined parts in Hastelloy B2, the nickel-molybdenum alloy for hydrochloric acid and other strongly reducing chemicals, made to your drawing in our Willenhall facility.
UNS N10665
Also W.Nr 2.4617 and Nimofer 6928
26 to 30% Mo
Molybdenum for reducing acids
110 ksi
Minimum tensile strength (758 MPa), annealed
1 to 500
Prototypes to batches of several hundred
About the alloy
A nickel-molybdenum alloy for reducing acids
HAGUE FASTENERS makes Hastelloy B2 fasteners in the UK for chemical plant that handles hydrochloric acid, aluminium chloride catalysts and other strongly reducing media. With around 28% molybdenum and very little chromium or iron, B2 resists these acids far better than stainless steels or the chromium-bearing C-type alloys.
B2 is not suited to oxidising conditions: ferric or cupric salts cause rapid attack. We are happy to check your duty, or to suggest the later Hastelloy B3.
At a glance
- Nickel-molybdenum alloy, nickel balance
- For hydrochloric, sulphuric, phosphoric and acetic acids
- Good high temperature strength in inert and vacuum atmospheres
- Service from ambient up to 1500°F (about 815°C), depending on the environment
Composition
Hastelloy B2 chemical composition
Percentage by weight.
| Element | Min % | Max % |
|---|---|---|
| Nickel (Ni) | Bal | – |
| Chromium (Cr) | – | 1.00 |
| Molybdenum (Mo) | 26.00 | 30.00 |
| Manganese (Mn) | – | 1.00 |
| Iron (Fe) | – | 2.00 |
| Silicon (Si) | – | 0.10 |
| Carbon (C) | – | 0.02 |
| Phosphorus (P) | – | 0.040 |
| Sulphur (S) | – | 0.030 |
| Cobalt (Co) | – | 1.00 |
Properties
Mechanical properties (annealed)
Minimum values in the annealed condition.
| Property | Value |
|---|---|
| Tensile strength, min. | 110 ksi (758 MPa) |
| Yield strength (0.2% offset), min. | 51 ksi (352 MPa) |
| Elongation in 2 in (50 mm) or 4D | 40% |
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
Hastelloy B2 equivalents and typical uses
Alternative designations
UNS N10665, Hastelloy B2, Alloy B2, Nimofer 6928, ASTM B335, ASME SB335, dual certified to ASTM B564 and ASME SB564, W.Nr 2.4617.
Typical applications
- Equipment handling hydrochloric acid
- Aluminium chloride catalyst service
- Sulphuric, phosphoric and acetic acid processes
- Chemical process vessels, pumps and valves
What we make
Fasteners we make in Hastelloy B2
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 Hastelloy B2?
Hastelloy B2 is UNS N10665 and W.Nr 2.4617, also sold as Alloy B2 and Nimofer 6928. Bar is supplied to ASTM B335 and ASME SB335.
What are Hastelloy B2 fasteners used for?
Hastelloy B2 fasteners are used where hydrochloric acid and other reducing chemicals would attack stainless steel and most nickel alloys, mainly in chemical process plant.
Can Hastelloy B2 be used with ferric or cupric salts?
No. Ferric and cupric salts make the environment oxidising and can cause rapid corrosion of B2, so a C-type alloy such as C276 is usually considered instead.
What is the difference between Hastelloy B2 and B3?
B3 is a later B-type alloy with better thermal stability during fabrication, and it can be used in all applications that previously called for B2.
Hastelloy B2 enquiry?
Send us your drawing or specification
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