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Nimonic (UNS N07080) 80A Round Bars Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier and stockist in Mumbai, India. We supply Alloy 80A bar according to ASTM B637 standard.
Nimonic 80A round bar provides precipitation-hardened creep-rupture strength up to 815°C (1500°F), specified for gas turbine blades, high-temperature fasteners, and nuclear boiler components. This wrought, age-hardenable nickel-chromium alloy (UNS N07080, W.Nr. 2.4952 / 2.4631) is strengthened by titanium and aluminium additions that form the γ′ Ni₃ (Ti, Al) precipitate phase during ageing. With Ni ≥73%, Cr 18–21%, Ti 1.80–2.70%, and Al 1.00–1.80%, Nimonic 80A bar combines excellent oxidation resistance with superior toughness and ductility under demanding thermal conditions. Each of our bars comes with EN 10204 3.1 mill test certificates and PMI reports. In the aged condition (8h/1080°C/AC + 16h/700°C/AC), Nimonic 80A bar reaches 1000 MPa (145 ksi) tensile strength and 620 MPa (90 ksi) proof stress with a hardness of 250–350 HB minimum. At 700°C, the bar retains approximately 60% of room-temperature proof stress, making it superior to solid-solution nickel alloys for sustained loads in the 600–815°C range. Oxidation weight loss at 900°C/100h is 11.2 mg/cm² under continuous heating. The cobalt content is limited to 2% max, keeping Alloy 80A suitable for nuclear environments.
Bar diameters span 6 mm to 200 mm as per ASTM B637, BS HR1 / HR601, and AMS 5766. Lengths run 1–6 metres with cut-to-length service. Available forms include round bar, rod, hex bar, flat bar, forged bar, and hollow bar. These bars are commonly referred to as Nicrofer 7520 Ti, Pyromet 80A, Superimphy 80A, and Udimet 80A.
Nimonic 80A Round Bar Specifications
Nimonic 80A bar specifications, including grade, standards, forms, diameters, lengths, conditions, finish, and hardness, are covered in the table below:
| Grade | Nimonic 80A / Alloy 80A |
|---|---|
| Standards | ASTM B637, BS HR1, BS HR601, BS 3076 NA20, AMS 5766 |
| Forms | Round Bar, Rod, Hex Bar, Flat Bar, Forged Bar |
| Diameter | 6 mm – 200 mm |
| Length | 1000 – 6000 mm, cut-to-length |
| Condition | Solution Treated + Aged, Solution Treated Only |
| Heat Treatment | 8h/1080°C/AC + 16h/700°C/AC |
| Finish | Black, Bright, Polished, Centreless Ground |
| Hardness | 250–350 HB (aged) |
Nimonic 80A vs Nimonic 90 – Which Bar Grade to Specify?
Following is a selection guide to choose between Nimonic 80A and Nimonic 90:
| Parameter | Nimonic 80A | Nimonic 90 |
|---|---|---|
| Cobalt | 2% max | 15–21% |
| Max Creep Temp | 815°C | 920°C |
| Tensile (aged) | ~1000 MPa | ~1080 MPa |
| Standard | ASTM B637, BS HR1 | AMS 5829, BS HR2 |
| Nuclear | Preferred (low Co) | Not recommended |
| Cost | Lower | Higher |
| Typical Use | Exhaust valves, bolts | Turbine blades, springs |
Chemical Composition of Nimonic 80A Bar & Rod
| Nickel (Ni) | Chromium (Cr) | Titanium (Ti) | Aluminium (Al) | Carbon (C) | Cobalt (Co) | Iron (Fe) | Silicon (Si) | Manganese (Mn) | Copper (Cu) | Boron (B) | Sulphur (S) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance (≥73%) | 18.0 – 21.0 | 1.80 – 2.70 | 1.00 – 1.80 | 0.04 – 0.10 | 2.0 max | 3.0 max | 1.0 max | 1.0 max | 0.20 max | 0.008 max | 0.015 max |
Mechanical Properties of ASTM B637 Nimonic 80A Round Bar
| Property | Proof 0.2% | Tensile | Elongation | RA | Hardness |
|---|---|---|---|---|---|
| Aged (ST+Age) | 620 MPa (90 ksi) | 1000 MPa (145 ksi) | ≥15% | ≥20% | 250–350 HB |
| Solution Treated | 350 MPa | 750 MPa | ≥30% | – | – |
Physical Properties of Nimonic 80A Round Bar
| Property | Density | Melting Range | Elastic Modulus (20°C) | Specific Heat (20°C) | Thermal Conductivity (20°C) | Electrical Resistivity |
|---|---|---|---|---|---|---|
| Value | 8.19 | 1320–1365 | 222 | 448 | 11.2 | 1.24 |
| Unit | g/cm³ | °C | GPa | J/kg·°C | W/m·K | µΩ·m |
Nimonic 80A Round Bar Equivalent Grades
The equivalent designation for Alloy 80A bar is UNS N07080, and its Werkstoff Nr. is 2.4952. Some of its other global equivalent designations are mentioned in the table below:
| UNS | Werkstoff Nr. | DIN |
|---|---|---|
| N07080 | 2.4952, 2.4631 | 17742, 17754 |
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Available Forms of Nimonic 80A Bar & Rod
Nimonic 80A Hot-Rolled Bar
Nimonic 80A Cold-Drawn Bar
Nimonic 80A Forged Bar
Nimonic 80A Hex & Flat Bar
Nimonic 80A Hollow Bar
Creep-Rupture & Elevated Temperature Behaviour of Nimonic 80A Bar
An aged Nimonic 80A bar provides service up to 815°C under sustained loading. The γ′ precipitate pins dislocations and resists grain boundary sliding. Stress relaxation resistance at 500–700°C is excellent, making Alloy 80A the preferred choice for high-temperature bolting in power generation and nuclear applications where bolt pre-load must hold over years of service.
Oxidation weight loss at 900°C/100h continuous heating is ~11.2 mg/cm². At 1000°C intermittent heating (24h cycles): 8.92 mg/cm². The Cr₂O₃ scale protects against oxidising atmospheres. Fatigue data from 20°C to 750°C (Special Metals SMC-074) confirms suitability for rotating turbine and automotive components.
Hot Working, Cold Working & Heat Treatment of Nimonic 80A Bar
It is recommended to hot work the Nimonic 80A round bar at 1050–1200°C. Forging range is 982–1176°C. The alloy work-hardens rapidly during cold working; intermediate anneals are needed for large reductions.
Solution treat it at 1080°C for 8 hours, then air cool. Age at 700°C for 16 hours, then air cool. This two-step cycle precipitates maximum γ′ for peak creep-rupture strength. Weld using TIG or MIG with matching filler. Material must be in a solution-treated condition before welding. Post-weld solution + ageing restores full joint strength.
Industries & Applications Using Nimonic 80A Round Bars & Rods
- Turbine blades, discs, ring sections, and nozzle guide vanes at 600–815°C.
- Exhaust valves for high-performance and diesel engines.
- Boiler tube supports and structural fasteners; preferred over Nimonic 90 due to low cobalt (2% max vs 15–21%).
- High-temperature bolting for steam turbine casings at 500–700°C.
- Die casting inserts and cores that resist thermal fatigue in aluminium and zinc operations.
How to Order Nimonic 80A Round Bar
Provide the following 10 documents to place an order of Nimonic 80A round bar for quotations:
- Product Form Round, Rod, Hex, Flat, Forged Bar.
- Diameter / Cross-section mm or inch.
- Length Standard 1–6m or cut-to-length.
- Condition Solution Treated + Aged, Solution Treated Only.
- Finish Black, Bright, Centreless Ground.
- Standard ASTM B637, BS HR1, BS HR601, AMS 5766.
- Tolerance h9, h11, or custom.
- Test Certificates EN 10204 3.1/3.2, PMI, UT.
- Special Requirements Vacuum refined, electroslag refined.
- Quantity kg or pieces.
Frequently Asked Questions
What ASTM Standard covers Nimonic 80A Round Bar?
ASTM B637 covers precipitation-hardenable nickel alloy rods, bars, and forgings for high-temperature service, including UNS N07080. Additional standards include BS HR1, HR601, AMS 5766, and DIN 17742.
What is the Maximum Service Temperature for Nimonic 80A Bar?
Under sustained creep loading, Nimonic 80A bar is rated to 815°C (1500°F). Above this, γ′ coarsening reduces creep strength. For higher service, consider Nimonic 90 (920°C) or Nimonic 105.
What Diameter Range is Available for Nimonic 80A Round Bar?
Nicorex Alloys stocks 6 mm to 200 mm in diameter. Forged bar is available in larger diameters on request. Standard lengths: 1–6 metres with cut-to-length service.
Does Nimonic 80A Bar Require Solution Treatment Before Welding?
Yes. Welding aged material risks strain-age cracking in the HAZ. Post-weld solution treatment followed by re-ageing is recommended for full joint strength recovery.