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
Hiduron vs C95400 Nickel Aluminium Bronze
Hiduron 130 (UNS C72400), Hiduron 191 (UNS C72420) and C95400 nickel aluminium bronze are commonly confused in field practice because both carry copper, nickel and aluminium as primary elements. The two are different alloy families. Hiduron is a copper-rich Cu-Ni-Al precipitation-hardened cupronickel with the gamma-prime Ni3Al strengthening mechanism. C95400 is a copper-rich Cu-Al-Ni-Fe aluminium bronze with a duplex alpha plus kappa microstructure and no gamma-prime precipitation. The element rank order tells the story: Hiduron is Cu-Ni-Al (nickel dominant after copper); C95400 is Cu-Al-Ni-Fe (aluminium dominant after copper). The two alloys solve different problems and are not interchangeable.
At a Glance: Hiduron vs C95400
| Property | Hiduron 130 (C72400) | Hiduron 191 (C72420) | C95400 (Nickel Al Bronze) |
|---|---|---|---|
| Family | Cu-Ni-Al cupronickel | Cu-Ni-Mn-Al cupronickel | Cu-Al-Ni-Fe aluminium bronze |
| Element rank | Cu - Ni - Al | Cu - Ni - Mn - Al | Cu - Al - Ni - Fe |
| Microstructure | FCC + gamma-prime Ni3Al | FCC + gamma-prime Ni3Al + Mn SS | Alpha + kappa duplex |
| Tensile (Rm) | 740 to 850 MPa | 820 to 1000 MPa | 586 to 690 MPa (cast) |
| 0.2 percent proof | >=480 MPa | >=580 MPa | 240 to 310 MPa (cast) |
| Primary form | Wrought bar, bolting | Wrought bar, bolting | Cast (propellers, valves) |
| NACE MR0175 | n/a primary | Qualified <=286 HBW | Not the primary NACE Cu-Al-Ni listing |
Chemistry Comparison
| Element | Hiduron 130 | Hiduron 191 | C95400 |
|---|---|---|---|
| Cu | balance (~80 to 82) | balance (~76 to 78) | balance (~83 to 86) |
| Al | 2.7 to 3.4 | 1.5 to 2.5 | 10.0 to 11.5 |
| Ni | 14.0 to 15.5 | 14.0 to 15.5 | up to 1.5 |
| Fe | 1.0 to 2.0 | 0.5 to 1.5 | 3.0 to 5.0 |
| Mn | up to 0.75 | 4.0 to 5.0 | up to 0.50 |
When to Specify Hiduron vs C95400
- Specify Hiduron 130 or 191 when the application is wrought bolting or machined components. Hiduron is supplied in wrought round bar with consistent gamma-prime response on the solution-anneal plus age cycle. C95400 is a casting alloy and is not the primary form for bolting.
- Specify C95400 when the application is a cast component such as a marine propeller, large valve body, pump casing or hand-rail fitting where the casting form is the natural production route and the alpha plus kappa duplex microstructure carries the corrosion and cavitation envelope.
- Specify Hiduron 191 when the application carries a NACE MR0175 sour-service bolting requirement and the structural strength envelope above 580 MPa proof is the driver. C95400 is not the primary NACE listing for bolting; the cast aluminium bronze envelope is different.
- Do not interchange the two families. The element rank order (Cu-Ni-Al vs Cu-Al-Ni-Fe) is the diagnostic. Hiduron is a cupronickel; C95400 is an aluminium bronze. The two are different alloy classes with different specifications, different welding behaviour and different price levels.
Form Availability
Hiduron 130 and Hiduron 191 are supplied in the wrought 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. C95400 is supplied as castings (propellers, valve bodies, pump casings) and limited wrought rod from adjacent foundry and mill sources for marine and offshore casting applications.
Frequently Asked Questions
Q. Is Hiduron the same as nickel aluminium bronze?
No. Hiduron is a Cu-Ni-Al precipitation-hardened cupronickel with gamma-prime Ni3Al strengthening. Nickel aluminium bronze (C95400) is a Cu-Al-Ni-Fe casting alloy with an alpha plus kappa duplex microstructure. The element rank order is the diagnostic: Hiduron is Cu-Ni-Al; C95400 is Cu-Al-Ni-Fe.
Q. Both have copper, nickel and aluminium; why are they different?
The rank order and concentration tell the story. Hiduron carries about 14 to 15 percent nickel and 1.5 to 3.4 percent aluminium with copper balance. C95400 carries about 10 to 11.5 percent aluminium and only up to 1.5 percent nickel with copper balance. The two are different alloy classes that crystallise into different microstructures.
Q. Which to use for marine propellers?
C95400 (nickel aluminium bronze) is the established cast alloy for marine propellers. Hiduron is supplied in wrought form for bolting and machined components and is not the primary alloy for cast propellers.
Q. Which to use for naval bolting?
Hiduron 191 (UNS C72420) is the primary alloy for Royal Navy and allied naval bolting under NES 835, DEF STAN 02-835 and DOD-C-24676. C95400 is a casting alloy and is not specified into bolting service.
Q. Do you supply both alloys?
TorqBolt supplies Hiduron 130 and Hiduron 191 in the wrought bolting and machined-component form range. C95400 castings are sourced from adjacent foundries for project supply when the cross-reference is required on the same purchase order.
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