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 Mechanical Properties
Hiduron 130 (UNS C72400, DTD 900/4805) in the solution-annealed plus aged condition delivers tensile strength 740 to 850 MPa, 0.2 percent proof stress at least 480 MPa, and elongation at least 18 percent. Hiduron 191 (UNS C72420, NES 835, DEF STAN 02-835, DOD-C-24676) on the same cycle lifts the tensile envelope to 820 to 1000 MPa with 0.2 percent proof stress at least 580 MPa and elongation at least 15 percent. Both grades hold above 60 J Charpy V impact at room temperature on Hiduron 130 and above 40 J on Hiduron 191. The hardness sits in the 240 to 280 HV band for 130 and 270 to 320 HV for 191, with the NACE MR0175 sour-service cap on 191 controlled at or below 286 HBW (28 HRC) for naval and offshore bolting applications.
Request a Quote on Hiduron Bolting with Mechanical Test Certificate
Hiduron Room-Temperature Mechanical Properties (Solution Annealed and Aged)
| Property | Hiduron 130 | Hiduron 191 | Test condition |
|---|---|---|---|
| Tensile strength (Rm) | 740 to 850 MPa | 820 to 1000 MPa | RT, longitudinal |
| 0.2 percent proof stress (Rp0.2) | >=480 MPa | >=580 MPa | RT, longitudinal |
| Elongation A5 | >=18 percent | >=15 percent | RT, longitudinal |
| Reduction of area | >=35 percent | >=30 percent | RT, longitudinal |
| Hardness (HV) | 240 to 280 | 270 to 320 | RT, Vickers |
| Hardness (HBW) | 235 to 270 | 260 to 286 max | NACE limit on 191 |
| Charpy V impact | >=60 J | >=40 J | RT, longitudinal, 10x10 mm |
| Fatigue endurance (rotating beam, 10^7 cycles) | ~220 MPa | ~260 MPa | RT, polished, air |
| Modulus of elasticity (E) | ~135 GPa | ~130 GPa | RT, tensile |
Hiduron Elevated-Temperature Mechanical Properties
| Temperature | Hiduron 130 Rp0.2 | Hiduron 130 Rm | Hiduron 191 Rp0.2 | Hiduron 191 Rm |
|---|---|---|---|---|
| 20 deg C (RT) | >=480 MPa | 740 to 850 MPa | >=580 MPa | 820 to 1000 MPa |
| 100 deg C | ~470 MPa | ~730 MPa | ~570 MPa | ~810 MPa |
| 200 deg C | ~450 MPa | ~700 MPa | ~545 MPa | ~785 MPa |
| 300 deg C | ~410 MPa | ~660 MPa | ~510 MPa | ~750 MPa |
| 350 deg C (service ceiling) | ~380 MPa | ~625 MPa | ~480 MPa | ~720 MPa |
The service ceiling is set at 350 deg C because above this the gamma-prime Ni3Al precipitate begins to over-coarsen and the room-temperature strength on return cooling drops below the specification floor. For subsea, splash-zone and naval bolting applications the operating temperature stays well inside the envelope (sub-zero seawater up to roughly 80 deg C process service), so the elevated-temperature curve is informational rather than design-controlling for the standard service.
Strength against Ductility Trade-Off Between Hiduron 130 and 191
The strength uplift from Hiduron 130 to Hiduron 191 (480 MPa proof to 580 MPa proof) costs roughly 3 percentage points of elongation and 20 J of Charpy V impact. For subsea hydraulic connectors the 130 ductility headroom is decisive; for splash-zone naval bolting the 191 yield headroom is decisive. Both grades stay non-magnetic, both stay NACE-compliant when hardness is controlled at or below 286 HBW, and both meet the requirement that the gamma-prime strengthening be reversible by re-solutioning, which gives the supply chain a safety margin against over-ageing during forging or welding.
Hiduron 130 + 191 Designation Chain
| Designation system | Hiduron 130 | Hiduron 191 |
|---|---|---|
| UNS (Unified Numbering System) | C72400 | C72420 |
| Werkstoff (German register) | 2.1504 | not formally assigned |
| Chemical-symbol designation | CuNi14Al3Fe1 | CuNi14Mn4AlFe |
| UK Air Ministry | DTD 900/4805 | not applicable |
| UK Naval Engineering Standard | not applicable | NES 835 |
| UK Ministry of Defence | not applicable | DEF STAN 02-835 |
| US Department of Defense | not applicable | DOD-C-24676 |
| Originator and brand | Langley Alloys (UK) | Langley Alloys (UK) |
Related Hiduron Property Pages
- Chemical Composition: Element ranges for both grades with role notes for each addition.
- Mechanical Properties: Yield, tensile, elongation and hardness at room and elevated temperature.
- Heat Treatment: Solution-anneal plus age cycle for gamma-prime Ni3Al precipitation.
- Seawater Corrosion: Cu-Ni-Al passive film behaviour in flowing seawater.
- SCC Resistance: Stress-corrosion cracking and hydrogen embrittlement immunity.
- Magnetic Permeability: Non-magnetic naval and aerospace qualification.
- Machinability: Cu-Ni-Al cutting parameters and tooling notes.
- Density and Physical Properties: Density, modulus, thermal expansion, conductivity.
Hiduron Forms TorqBolt Supplies
| Form factor | Standard sizes | Page |
|---|---|---|
| Round bar (raw stock) | OD 16 to 250 mm | Round Bar |
| Stud bolts | M12 to M100, 50 to 600 mm | Stud Bolts |
| Hex bolts (DIN 931 / ISO 4014) | M12 to M64 | Hex Bolts |
| Heavy hex bolts (ASME B18.2.1) | 1/2 to 3 inch | Heavy Hex Bolts |
| Nuts and heavy hex nuts | M12 to M100 | Nuts |
| Washers (flat, spring, locking) | M12 to M48 | Washers |
| Forgings (subsea connector blank) | up to 600 kg piece | Forgings |
| Machined components (custom) | to project drawing | Machined Components |
Where Hiduron Is Specified
- Subsea Connectors: Hiduron 130 flying-lead, stab-plate and umbilical termination bodies.
- Riser Bolting: Hiduron 191 splash-zone bolting on North Sea and Gulf of Mexico platforms.
- Splash Zone Bolting: Hiduron 191 fasteners for the wet-dry tidal band.
- Naval Fasteners: NES 835 and DEF STAN 02-835 procurement on Royal Navy and allied bolting.
- Pump Shafts and Valve Spindles: Marine pump shafts and subsea valve spindles.
- Mechanical Seals: Seal-face bodies against tungsten-carbide running faces.
- Propeller Shafts: Naval and commercial marine propeller shafts.
- Sour Service (NACE): NACE MR0175 qualified bolting for sour oil and gas service.
Hiduron Controlling Standards
| Standard | Scope | Relevance |
|---|---|---|
| NES 835 | UK Naval Engineering Standard for Cu-Ni-Al bolting | Hiduron 191 controlling spec |
| DEF STAN 02-835 | UK Ministry of Defence adoption of NES 835 | Hiduron 191 MoD procurement |
| DOD-C-24676 | US Department of Defense Cu-Ni-Al spec | Hiduron 191 US Navy procurement |
| DTD 900/4805 | UK Air Ministry specification | Hiduron 130 original spec |
| NACE MR0175 | Sour service materials qualification | Hiduron 191 qualified to 286 HBW limit |
EN 10204 Certification and Inspection
Every Hiduron 130 and Hiduron 191 stock and finished fastener ships with EN 10204 type 3.1 mill test certificate as standard. Type 3.2 third-party witness by Lloyd's Register, DNV, BV, SGS or TUV is supplied on call-out and is standard practice on naval and subsea procurement orders. The certificate carries the melt heat number, full chemical analysis to the controlling specification, solution-anneal plus age cycle parameters, tensile and yield results, hardness, Charpy V impact result where called out, and the dimensional report. For Hiduron 191 sour-service orders, an additional NACE MR0175 hardness certificate confirms that every test piece reads below the 286 HBW (28 HRC) limit.
Request a Quote on Hiduron Bolting
TorqBolt supplies Hiduron 130 (UNS C72400, DTD 900/4805) and Hiduron 191 (UNS C72420, NES 835, DEF STAN 02-835, DOD-C-24676) in round bar, stud bolts, hex bolts, heavy hex bolts, nuts, washers, forgings and machined components. Standard fastener lead time is 4 to 8 weeks from order, subsea machined components quote project-specific lead time. Send an enquiry through TorqBolt Contact with the controlling specification, the form factor, the size envelope and the certification level (3.1 default, 3.2 on call-out, NACE on call-out).
Request a Quote on Hiduron 130 and Hiduron 191 Bolting Stock and Fasteners
Reference and Downloads
- Hiduron 130 Datasheet: Consolidated chemistry, mechanicals and heat treatment.
- Hiduron 191 Datasheet: NACE-qualified naval and subsea grade datasheet.
- Bolt Dimensions: Imperial and metric thread, head and stress-area tables.
- Torque Chart: Cu-Ni-Al fastener torque values, dry and lubricated.
- FAQ: Consolidated questions on Hiduron specification, certification and supply.
Hiduron Mechanical Properties FAQ
Q. What is the Hiduron 191 yield strength?
Hiduron 191 carries a 0.2 percent proof stress of at least 580 MPa on the standard solution-anneal plus age cycle, with a tensile envelope of 820 to 1000 MPa. The yield is reported on the EN 10204 type 3.1 mill test certificate for every heat.
Q. What is the Hiduron 130 yield strength?
Hiduron 130 carries a 0.2 percent proof stress of at least 480 MPa, tensile 740 to 850 MPa, elongation at least 18 percent on solution-anneal plus age. The mid-strength response makes it the standard subsea hydraulic connector grade.
Q. What is the Hiduron service temperature ceiling?
The practical ceiling is 350 deg C. Above this the gamma-prime Ni3Al precipitate over-coarsens and the strength on return cooling falls below the specification floor. For subsea and naval bolting the operating service stays well inside the envelope.
Q. Is the Hiduron 191 hardness controlled for NACE service?
Yes. NACE MR0175 / ISO 15156 caps the hardness at 286 HBW (28 HRC). Every Hiduron 191 stud or bolt for sour service is hardness-tested and the reading is reported on the certificate as the NACE compliance evidence.
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