Nickel and nickel alloys · Alloy 80 A / Nicrofer 7520 Ti / N07080 / 2.4952
Alloy 80A (Nimonic 80A, 2.4952): Engineering Reference for Heat-Resistant Alloy
Engineering Specifications for Alloy 80 A
| Forms of Supply | Alloy Marking | Specifications | Analogs and Standards | Analogs and Standards | |||
|---|---|---|---|---|---|---|---|
| Sheet, plates, strip, bars, forgings, wire | Alloy 80 A, Nicrofer 7520 Ti, Nimonic 80A, VDM Alloy 80 A, UNS N07080 | ASTM | ASME | W.Nr. | DIN | MSRR | ISO |
| Sheet, plates, strip, bars, forgings, wire | Alloy 80 A, Nicrofer 7520 Ti, Nimonic 80A, VDM Alloy 80 A, UNS N07080 | B 637 | SB 637 | 2.4952, 2.4631 | 17742, 17240 | 7004, 7022, 7063, 7070, 7162, 7193, 7952 | 6208 |
| Sheet, plates, strip, bars, forgings, wire | Alloy 80 A, Nicrofer 7520 Ti, Nimonic 80A, VDM Alloy 80 A, UNS N07080 | B 637 | SB 637 | 2.4952, 2.4631 | 17742, 17240 | 7004, 7022, 7063, 7070, 7162, 7193, 7952 | 6208 |
Alloy 80 A (VDM) is a nickel-chromium superalloy strengthened by dispersion hardening due to the formation of the γ'-phase (Ni3(Al,Ti)). Alloying with titanium and aluminum provides exceptional strength and creep resistance at high temperatures. EV Group China supplies the material in a fully heat-treated condition (solution + aging), which is a prerequisite for critical components operating under load.
Component Chemical Composition of Alloy 80 A, %
| Ni | >65.0 |
|---|---|
| B | <0.008 |
| S | <0.015 |
| P | <0.020 |
| C | 0.04-0.10 |
| Cu | <0.2 |
| Al | 1.0-1.8 |
| Co | <1.0 |
| Mn | <1.0 |
| Si | <1.0 |
| Fe | <1.5 |
| Ti | 1.8-2.7 |
| Cr | 18.0-21.0 |
Mechanical Properties of Alloy 80 A at Elevated Temperatures
Data on the short-term mechanical properties of Alloy 80 A, depending on temperature, according to ASTM B637, are provided for the material after full heat treatment.
| Temperature | Yield Strength, Rp0.2 (MPa) | Tensile Strength, Rm (MPa) | |||
|---|---|---|---|---|---|
| 20 | 68 | 600 | 87.0 | 930 | 135 |
| 100 | 212 | 586 | 85.0 | - | - |
| 200 | 392 | 568 | 82.2 | - | - |
| 300 | 572 | 560 | 81.2 | - | - |
| 400 | 762 | 540 | 78.3 | - | - |
| 500 | 932 | 520 | 75.4 | - | - |
| 600 | 1112 | 500 | 72.5 | - | - |
| °C | °F | MPa | ksi | MPa | ksi |
Physical Constants and Properties
The nominal density of Alloy 80 A (UNS N07080) is 8.2 g/cm³.
Corrosion Resistance and High-Temperature Oxidation
Nicrofer 7520 Ti alloy exhibits excellent resistance to high-temperature oxidation, especially under thermal cycling conditions. The formation of a dense, adhesive Cr2O3-based oxide layer on the surface guarantees protection against material degradation at operating temperatures reaching 1000 °C.
Welding Technology
The weldability of Nimonic 80A is ensured by standard processes such as TIG and MIG welding. It is imperative that the material is in the solution annealed condition before welding operations begin. To achieve homogeneity and strength of the weld, appropriate filler materials (e.g., Nimonic 90 wire) must be used.
Key Advantages and Performance Characteristics
- Exceptional resistance to oxidation and corrosion in aggressive gaseous environments at high temperatures.
- High creep and rupture strength under prolonged loads at temperatures up to 815 °C.
- Excellent fatigue strength under cyclic mechanical and thermal loads.
Areas of Application
The key application areas of Alloy 80 A are due to its unique combination of heat resistance and creep resistance. The alloy is indispensable in the hot section of gas turbine engines for the manufacture of blades, disks, and fasteners. It is also used for the production of exhaust valves in high-performance internal combustion engines, springs operating at high temperatures, and load-bearing elements of supercritical boiler parameters.