# Hiduron 130 + Hiduron 191 — Cu-Ni-Al Precipitation-Hardened Cupronickel Bolting

> hiduron.com is the TorqBolt authority hub for Hiduron 130 (UNS C72400 / DTD 900/4805)
> and Hiduron 191 (UNS C72420 / NES 835 / DEF STAN 02-835 / DOD-C-24676) — gamma-prime
> precipitation-hardened cupronickel for subsea hydraulic connectors, riser bolting,
> splash-zone bolting, naval fasteners, and NACE MR0175 sour-service applications.

## Alloy Identity

- Hiduron 130 = UNS C72400 = Werkstoff 2.1504 = CuNi14Al3Fe1 = DTD 900/4805
- Hiduron 191 = UNS C72420 = NES 835 = DEF STAN 02-835 = DOD-C-24676
- Family: Cu-Ni-Al precipitation-hardened cupronickel (gamma-prime mechanism, analogous to Monel K-500)
- USPs: anti-galling, anti-biofouling, non-magnetic, hydrogen-embrittlement immune, NACE MR0175 compliant

## Material

- [Chemical Composition](https://hiduron.com/chemical-composition): Cu-Ni-Al element ranges (both grades)
- [Mechanical Properties](https://hiduron.com/mechanical-properties): RT + elevated yield/UTS/elongation
- [Heat Treatment](https://hiduron.com/heat-treatment): Solution anneal 850-900C + gamma-prime age 450-500C
- [Seawater Corrosion](https://hiduron.com/seawater-corrosion): Flowing seawater <0.025 mm/year
- [SCC Resistance](https://hiduron.com/scc-resistance): H2 embrittlement immunity (Hiduron 191 USP)
- [Magnetic Permeability](https://hiduron.com/magnetic-permeability): mu_r <1.005 non-magnetic
- [Machinability](https://hiduron.com/machinability): Cu-Ni-Al cutting parameters
- [Density (Physical Properties)](https://hiduron.com/density): 8.7 g/cm3, 135 GPa modulus

## Standards

- [NES 835](https://hiduron.com/nes-835): Naval Engineering Standard for Hiduron 191
- [DEF STAN 02-835](https://hiduron.com/def-stan-02-835): UK MoD naval cupronickel bolting
- [DTD 900/4805](https://hiduron.com/dtd-900-4805): UK Air Ministry spec for Hiduron 130
- [DOD-C-24676](https://hiduron.com/dod-c-24676): US DoD specification (US Navy procurement)
- [NACE MR0175](https://hiduron.com/nace-mr0175): Sour service compliance

## Cross-References

- [Hiduron 130 vs Hiduron 191](https://hiduron.com/vs-hiduron-130-191): Strength vs toughness trade-off
- [vs Monel K-500](https://hiduron.com/vs-monel-k500): Same gamma-prime mechanism (different family)
- [vs UNS C71500](https://hiduron.com/vs-c71500): 70/30 Cu-Ni (no Al strengthening)
- [vs UNS C72200](https://hiduron.com/vs-c72200): Adjacent Cu-Ni-16Cr
- [vs UNS C95400](https://hiduron.com/vs-c95400): Nickel Aluminum Bronze (different alloy class)
- [vs Nibron Special](https://hiduron.com/vs-nibron-special): Columbia Metals equivalent
- [vs Toughmet 3](https://hiduron.com/vs-toughmet-3): Materion alternative
- [vs Hidurel 5](https://hiduron.com/vs-hidurel-5): Sister-brand Cu-Ni-Si disambiguation

## Applications

- [Subsea Connectors](https://hiduron.com/subsea-connectors): Hiduron 130 FLAGSHIP (Langley CS32 family)
- [Riser Bolting](https://hiduron.com/riser-bolting): Hiduron 191 splash-zone proven >15 yrs North Sea
- [Splash Zone Bolting](https://hiduron.com/splash-zone-bolting): High-cycle wet/dry exposure
- [Naval Fasteners](https://hiduron.com/naval-fasteners): DEF STAN 02-835 + DOD-C-24676
- [Pump Shafts + Valve Spindles](https://hiduron.com/pump-shafts-valve-spindles): Anti-galling marine
- [Mechanical Seals](https://hiduron.com/mechanical-seals): Seal faces + bushings
- [Propeller Shafts](https://hiduron.com/propeller-shafts): Naval + commercial marine propulsion
- [Sour Service](https://hiduron.com/sour-service): NACE MR0175 H2S-bearing hydrocarbon bolting

## Form Factors

- [Round Bar](https://hiduron.com/round-bar): OD 16-300 mm primary commercial form
- [Stud Bolts](https://hiduron.com/stud-bolts): M12-M120 (transactional driver)
- [Hex Bolts](https://hiduron.com/hex-bolts): DIN 931 / ISO 4014
- [Heavy Hex Bolts](https://hiduron.com/heavy-hex-bolts): ASME B18.2.1
- [Anchor Bolts](https://hiduron.com/anchor-bolts): Marine + platform foundation
- [U-Bolts](https://hiduron.com/u-bolts): Pipe-support clamping
- [Threaded Rod](https://hiduron.com/threaded-rod): Cut-to-length
- [Nuts](https://hiduron.com/nuts): DIN 934 / ISO 4032 matched-grade
- [Heavy Hex Nuts](https://hiduron.com/heavy-hex-nuts): ASME B18.2.2
- [Washers](https://hiduron.com/washers): DIN 6916 / ASME B18.21.1 hardened
- [Forgings](https://hiduron.com/forging): Closed-die + open-die blanks up to 800 kg
- [Machined Components](https://hiduron.com/machined-components): Subsea connector bodies, valve spindles, shafts

## Reference / Downloads

- [Hiduron 130 Datasheet](https://hiduron.com/data-sheet-hiduron-130): Consolidated PDF
- [Hiduron 191 Datasheet](https://hiduron.com/data-sheet-hiduron-191): Consolidated PDF
- [Bolt Dimensions](https://hiduron.com/bolt-dimensions): Imperial + metric thread + head reference
- [Torque Chart](https://hiduron.com/torque-chart): M12-M64 dry + lubricated bolt-up values
- [FAQ](https://hiduron.com/faq): Frequently asked questions

## Authoritative External References

- Langley Alloys Hiduron 130: https://www.langleyalloys.com/products/hiduron-130/
- Langley Alloys Hiduron 191: https://www.langleyalloys.com/products/hiduron-191/
- Copper Development Association: https://www.copper.org/applications/marine/
- MakeItFrom UNS C72400 datasheet: https://www.makeitfrom.com/material-properties/UNS-C72400-Wrought-Copper

## About TorqBolt

TorqBolt Private Limited (Mumbai head office + Rajkot production plant, India)
manufactures Hiduron 130 + Hiduron 191 bolting stock and finished fasteners worldwide
with EN 10204 type 3.1 mill test certificate by default and type 3.2 with third-party
witness inspection (Lloyd's Register, DNV, BV, SGS, TUV) on call-out.

Contact: info@torqbolt.com | +91-22-66157017
Parent: torqbolt.com