Nimonic 80A round bar is a nickel-chromium superalloy bar designed for high-temperature applications where strength, oxidation resistance, and creep resistance are essential. The alloy is precipitation hardened with aluminum and titanium, allowing it to maintain excellent mechanical properties at elevated temperatures. Nimonic 80A round bars are widely used in aerospace engines, gas turbines, nuclear systems, and other demanding industrial environments.
Introduction to Nimonic 80A
Nimonic 80A is a precipitation-hardened nickel-chromium alloy developed for high-temperature service conditions. It provides excellent creep resistance, oxidation resistance, and structural stability at temperatures up to approximately 815°C. Because of these characteristics, it is commonly used in aerospace and power generation industries.
Nimonic 80A Round Bar Product Overview
Nimonic 80A round bars are produced through hot forging and hot rolling processes followed by solution treatment and aging heat treatment. These bars are available in various diameters and lengths depending on industrial requirements.
| Forma del prodotto | Gamma di diametri tipici | Lunghezza |
|---|---|---|
| Barra tonda laminata a caldo | 10 mm – 120 mm | Up to 6 meters |
| Barra tonda forgiata | 120 mm – 500 mm | Lunghezza personalizzata |
| Barra tonda lucida | 6 mm - 80 mm | Up to 6 meters |
Nimonic 80A Round Bar Chemical Composition
| Elemento | Contenuto (%) |
|---|---|
| Nichel (Ni) | Bilancio |
| Cromo (Cr) | 18 - 21 |
| Ferro (Fe) | ≤ 3 |
| Titanio (Ti) | 1.8 – 2.7 |
| Alluminio (Al) | 1.0 - 1.8 |
| Carbonio (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 1.0 |
| Silicio (Si) | ≤ 1.0 |
Nimonic 80A Round Bar Mechanical Properties
| Proprietà | Valore tipico |
|---|---|
| Resistenza a trazione | ≈ 950 MPa |
| Carico di snervamento | ≈ 550 MPa |
| Allungamento | ≥ 20% |
| Durezza | ≈ 200 HB |
Nimonic 80A Round Bar Physical Properties
| Proprietà | Valore |
|---|---|
| Densità | 8,19 g/cm³ |
| Intervallo di Fusione | 1320 – 1365°C |
| Conducibilità termica | ≈ 11 W/m·K |
| Resistività elettrica | ≈ 1.2 µΩ·m |
Nimonic 80A Round Bar High-Temperature Strength
Nimonic 80A round bars maintain excellent tensile strength and creep resistance at elevated temperatures. The precipitation strengthening effect of aluminum and titanium allows the alloy to retain mechanical stability in long-term high-temperature environments.
Nimonic 80A Round Bar Oxidation Resistance
The chromium content in Nimonic 80A forms a stable oxide layer on the surface, which protects the material from oxidation and scaling at elevated temperatures. This makes it suitable for components exposed to hot gases and combustion environments.
Nimonic 80A Round Bar Creep and Fatigue Resistance
Nimonic 80A offers excellent resistance to creep deformation and fatigue failure under cyclic loads. These properties are essential for turbine engine components that operate continuously under high stress and high temperatures.
Nimonic 80A Round Bar Heat Treatment Process
The typical heat treatment process for Nimonic 80A includes solution annealing followed by age hardening to achieve optimal mechanical properties.
| Heat Treatment Stage | Temperatura | Scopo |
|---|---|---|
| Ricottura della soluzione | ≈ 1080°C | Dissolve alloying elements |
| Trattamento dell'invecchiamento | ≈ 700 – 750°C | Precipitation strengthening |
Nimonic 80A Round Bar Machining and Welding Characteristics
Nimonic 80A is relatively difficult to machine due to its high strength and work-hardening tendency. Carbide tools and slower cutting speeds are recommended for machining. Welding is possible using specialized filler materials, although post-weld heat treatment may be required to restore mechanical properties.
Common Size Range and Tolerance
| Gamma di diametri | Tolerance Standard |
|---|---|
| 6 – 50 mm | h9 / h11 |
| 50 – 200 mm | ASTM tolerance |
| Above 200 mm | Forging tolerance |
Surface Conditions
Nimonic 80A round bars are typically supplied with different surface finishes depending on the manufacturing process and customer requirements.
| Surface Type | Descrizione |
|---|---|
| Superficie nera | Hot rolled or forged finish |
| Turned Surface | Machined surface with tighter tolerance |
| Polished Surface | Smooth finish for precision applications |
Standards and Equivalent Grades
| Standard | Grado |
|---|---|
| UNS | N07080 |
| BS | HR1 / HR201 |
| AMS | AMS 5829 |
Campi di applicazione principali
Nimonic 80A round bars are widely used in high-temperature industrial and aerospace applications due to their excellent mechanical properties.
- Aerospace turbine engine components
- Gas turbine blades and discs
- High-temperature fasteners
- Industrial furnace components
- Nuclear and power generation equipment
Domande frequenti (FAQ)
What is Nimonic 80A round bar used for?
It is mainly used for aerospace turbine engines, gas turbines, and other high-temperature structural components.
Is Nimonic 80A suitable for high-temperature applications?
Yes. It maintains excellent strength and oxidation resistance at temperatures up to around 815°C.
What makes Nimonic 80A stronger than some other nickel alloys?
Its precipitation hardening mechanism using aluminum and titanium significantly improves high-temperature strength and creep resistance.
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