NIMONIC 80A FASTENERS — DATASHEET, CHEMICAL COMPOSITION, MECHANICAL PROPERTIES & SUPPLY

Ananka Fasteners is a premier manufacturer and global exporter of Nimonic 80A Fasteners (UNS N07080 / W.Nr. 2.4952 / 2.4631), a highly advanced, wrought, age-hardenable nickel-chromium superalloy. Occupying a critical position in high-temperature materials engineering, Nimonic 80A is specified for mission-critical mechanical assemblies where standard stainless steels and lower-tier nickel alloys rapidly degrade via creep-rupture, severe oxidation, or high-cycle thermal fatigue.

The defining engineering breakthrough of UNS N07080 is its precipitation-hardenable matrix. By incorporating controlled additions of titanium and aluminum, the alloy precipitates a finely dispersed gamma prime (γ') phase—Ni₃(Ti, Al)—during artificial aging. This intermetallic network effectively pins atomic dislocations, halting plastic deformation and granting the alloy exemplary creep-rupture strength at continuous service temperatures up to 815°C (1500°F).

Every Nimonic 80A fastener manufactured by Ananka is produced utilizing precision CNC machining, cryogenic hybrid cooling techniques to mitigate tool wear, and rigorous multi-stage heat treatments. Backed by EN 10204 Type 3.1 Material Test Certificates and adherence to ASTM B637 and DIN EN 10090 standards, we supply these elite fastening systems to the aerospace, nuclear power generation, advanced motorsport, and petrochemical refining sectors worldwide.

The chemical composition is meticulously controlled within highly restrictive bands to achieve the necessary balance of high-temperature strength, cyclic oxidation resistance, and hot fabricability. The specific stoichiometric ratio of titanium to aluminum is calibrated to maximize the volume fraction of the γ' precipitate upon aging.

Nimonic 80A delivers formidable mechanical strength that is custom-tailored through varying degrees of cold working and subsequent thermal precipitation treatments. In the fully aged state, it provides an optimal balance of sheer strength and toughness.

High-Temperature Creep & Stress Relaxation

The paramount hallmark of Nimonic 80A is its stress-rupture strength. At continuous service temperatures up to 815°C (1500°F), the densely packed γ' precipitates physically prevent time-dependent failure. When tested rigorously at 600°C (1112°F), the alloy successfully maintains significant operational residual stress thresholds over tests extending up to 10,000 continuous hours, establishing its reliability for baseload power generation turbines.

Nimonic 80A demonstrates extraordinary, class-leading resistance to high-temperature oxidation, scaling, and hot corrosion driven by molten salts and fuel impurities.

• Aerospace & Gas Turbines: Extensively utilized for internal engine rotor blades, blade lock plates, massive turbine discs, and the high-strength flange bolts that hold intensely pressurized hot-section engine casings together at 800°C.
• Nuclear Power Infrastructure: Premier material for nuclear boiler tube supports, reactor core restraints, and primary coolant loop fasteners due to low cobalt content and dimensional stability under neutron bombardment.
• Automotive & Motorsport: Widely deployed for heavy fuel marine engine exhaust valves and high-RPM racing engine manifold fastening hardware subjected to rapid cyclic thermal shock and vibrational fatigue.
• Petrochemical & Power Gen: Forms the backbone of structural fasteners in heat exchanger plants, hot-working tools, and bearing housings operating directly adjacent to gas turbine combustion chambers.

• Nimonic 80A Bolts: Heavy hex, socket head, and 12-point aerospace configurations.
• Nimonic 80A Nuts: High-temperature heavy hex and prevailing torque self-locking nuts.
• Nimonic 80A Washers: Belleville spring washers to compensate for thermal expansion mismatches and dynamically maintain preload.
• Nimonic 80A Studs: Uncompromising standard for gas turbine casing assemblies.

The inherent metallurgical traits that grant Nimonic 80A its supreme high-temperature stability simultaneously render it exceptionally challenging to machine and fabricate.

• Cryogenic Machining: To combat extreme tool wear caused by low thermal conductivity, advanced cryogenic hybrid cooling (Liquid CO₂ + MQL) is often utilized to protect PVD-coated TiAlN carbide inserts.
• Heat Treatment Protocols: Standard treatments involve Solution Annealing (1040 - 1120°C for 8 hrs) followed by Precipitation Aging (700 - 750°C for 16-24 hrs) to grow the Ni₃(Ti, Al) network.
• Thread Galling Mitigation: Severe galling can occur under high torque. Advanced surface treatments like PTFE fluorocarbon, pure silver plating, or Dacromet are applied to stabilize the friction coefficient and ensure accurate preload generation.

Every lot of Nimonic 80A fasteners shipped by Ananka is accompanied by a highly detailed EN 10204 Type 3.1 Manufacturer Test Certificate (MTC), ensuring absolute metallurgical pedigree traceable back to the originating mill.

Each MTC documents:

• Actual chemical analysis confirming strict Titanium, Aluminum, and trace Cobalt limits
• Complete mechanical tests for yield, ultimate tensile strength, and elongation in the fully aged condition
• Hardness results confirming the 250 - 350 HV / 310 - 400 HB aged state
• Verification of the specific Solution Annealing and Precipitation Aging thermal cycles utilized

• Controlled Hot Forging: Head-forging operations are executed within a strict, narrow temperature window of 1050°C to 1200°C utilizing exclusively low-sulfur fuels to prevent catastrophic surface oxidation and intergranular embrittlement.
• Advanced Thermal Processing: We execute complex, multi-stage heat treatments, including specialized three-stage sequences designed specifically to maximize stress relaxation resistance for critical high-temperature bolting.
• Surface Engineering: To combat extreme galling risks, we offer PTFE fluorocarbon coatings, silver plating, and Dacromet finishes, ensuring predictable torque-to-tension conversion during installation.
• 100% Traceability & Compliance: Our manufacturing aligns with PED 97/23/EC and ASTM B637. Fasteners are permanently stamped with our manufacturer symbol and the correct alloy property markings.