Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Hidurel 5 vs Hiduron
Hiduron and Hidurel 5 are sister-brand designations within the same UK mill family but they are different alloy classes with different chemistry, different strengthening mechanisms and different applications. The names are easily confused because both start with "Hidur" and both are marine and engineering copper-base alloys. The disambiguation matters because specifying the wrong alloy on a purchase order can cost weeks of project time. Hiduron is a Cu-Ni-Al precipitation-hardened cupronickel family covering Hiduron 130 (UNS C72400) and Hiduron 191 (UNS C72420) for subsea, naval and sour-service bolting. Hidurel 5 is a Cu-Ni-Si copper-nickel-silicon alloy family used as a beryllium-free substitute in connector and spring applications where higher electrical conductivity and lower magnetic response are needed without the beryllium toxicity and handling restriction.
At a Glance: Hiduron vs Hidurel 5
| Property | Hiduron 130 + 191 | Hidurel 5 |
|---|---|---|
| Family | Cu-Ni-Al precipitation-hardened cupronickel | Cu-Ni-Si beryllium-free copper alloy |
| Strengthening | Gamma-prime Ni3Al precipitation | Ni-Si silicide precipitation |
| Primary elements | Cu (balance) + Ni 14-15% + Al 1.5-3.4% | Cu (balance) + Ni 1.5-2.5% + Si 0.5-1.0% |
| Tensile (Rm) | 740 to 1000 MPa | 620 to 760 MPa |
| Electrical conductivity (%IACS) | ~4 to 6 percent IACS | ~40 to 55 percent IACS |
| Primary use case | Subsea bolting, naval bolting, sour service | Electrical connectors, springs, beryllium-free contact strip |
| Originator brand | Langley Alloys (UK) | Langley Alloys (UK) |
| Confusion risk | Very high (similar trade names) | Very high (similar trade names) |
Chemistry Comparison
| Element | Hiduron 130 typical | Hiduron 191 typical | Hidurel 5 typical |
|---|---|---|---|
| Cu | balance (~80 to 82) | balance (~76 to 78) | balance (~96 to 97) |
| Ni | 14.0 to 15.5 | 14.0 to 15.5 | 1.6 to 2.2 |
| Al | 2.7 to 3.4 | 1.5 to 2.5 | n/a |
| Si | up to 0.10 | up to 0.10 | 0.50 to 1.0 |
| Mn | up to 0.75 | 4.0 to 5.0 | up to 0.30 |
| Fe | 1.0 to 2.0 | 0.5 to 1.5 | up to 0.30 |
When to Specify Hiduron vs Hidurel 5
- Specify Hiduron 130 or 191 when the application is structural marine, naval or subsea bolting. Strength envelope 740 to 1000 MPa tensile, NACE MR0175 qualification on Hiduron 191, non-magnetic response on both grades, and the NES 835 / DEF STAN 02-835 / DOD-C-24676 / DTD 900/4805 procurement chain.
- Specify Hidurel 5 when the application is electrical contact strip, spring stock, connector inserts or sliding contact where the high electrical conductivity (40 to 55 percent IACS) and the beryllium-free chemistry are the selection drivers. Hidurel 5 is not specified into structural marine bolting.
- Always verify the spelling on the purchase order before issuing. Hiduron and Hidurel are easily mis-typed (Hiduron / Hidurel / Hidural / Hiduel) and the two alloy classes are sufficiently different that an error costs weeks of project time. The UNS number on the purchase order (C72400 or C72420 for Hiduron; the Hidurel 5 family carries different UNS numbers in the Cu-Ni-Si range) is the binding identifier.
- Do not interchange the two families. The element rank order is the diagnostic: Hiduron is Cu-Ni-Al (nickel 14 to 15.5 percent, aluminium 1.5 to 3.4 percent); Hidurel 5 is Cu-Ni-Si (nickel 1.5 to 2.5 percent, silicon 0.5 to 1.0 percent, copper at 96 to 97 percent).
Form Availability
Hiduron 130 and Hiduron 191 are supplied in the structural marine bolting and machined-component form range (round bar, stud bolts, hex bolts, heavy hex bolts, anchor bolts, U-bolts, threaded rod, nuts, heavy hex nuts, washers, forgings, machined components) detailed in the shared Forms block below. Hidurel 5 is supplied in electrical contact strip, spring stock and connector insert forms from adjacent mill sources for electrical and electronic applications. The two product ranges do not overlap.
Frequently Asked Questions
Q. Are Hiduron and Hidurel the same alloy?
No. They are different alloy families with similar trade names. Hiduron is a Cu-Ni-Al precipitation-hardened cupronickel (Hiduron 130 = UNS C72400, Hiduron 191 = UNS C72420) for structural marine and naval bolting. Hidurel 5 is a Cu-Ni-Si beryllium-free copper alloy for electrical contact strip, spring stock and connector applications.
Q. Why are the names so similar?
Both are Langley Alloys trade names within the same UK mill family. The shared Hidur prefix dates from the original brand-development era when the mill grouped its specialty copper alloys under a common naming convention. The convention has caused decades of purchase-order confusion because the two alloy classes are sufficiently different that a typo costs weeks of project time.
Q. Can I substitute Hidurel 5 for Hiduron on a bolting order?
No. Hidurel 5 carries about one-quarter the nickel content (1.5 to 2.5 percent vs 14 to 15.5 percent), no aluminium, and a fundamentally different strengthening mechanism (Ni-Si silicide vs gamma-prime Ni3Al). The mechanical envelope is lower, the corrosion behaviour is different, and the alloy is not specified into structural marine bolting.
Q. How do I avoid the confusion?
Cite the UNS number on the purchase order. C72400 (Hiduron 130) or C72420 (Hiduron 191) for the structural marine bolting alloy. Hidurel 5 carries a different UNS number in the Cu-Ni-Si range. The UNS number is the binding identifier; the trade name is informational.
Q. Do you supply Hidurel 5?
TorqBolt does not supply Hidurel 5 as a primary product. Hidurel 5 is supplied from adjacent mill sources for electrical and electronic applications. TorqBolt focus on Hiduron 130 and Hiduron 191 in the structural marine bolting and machined-component form range with EN 10204 type 3.1 or 3.2 certification to NES 835, DEF STAN 02-835, DOD-C-24676 and DTD 900/4805.
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