Aluminum Melting Point: Everything You Need to Know
Lightweight and low melting point are two unique characteristics of aluminum. At what temperature does this metal melt? Does the melting point carry any significance in manufacturing sections? Let’s explore the facts in the article below.
Figure 1: Aluminum Melting Point
What Does The Melting Point Mean?
The melting point indicates the temperature at which the solid material transforms into the liquid state. At melting temperature, the intermolecular bonds that build the metal’s crystalline structure begin to weaken. Hence, the transition from solid to liquid takes place.
The melting point of a material plays a significant role in the manufacturing process. Usually, a material with a high melting temperature requires more energy for the solid-to-liquid conversion.
Likewise, materials with low melting points are quite sensitive to fabrication operations. The heat generated during metalworking or joining operations might affect their quality.
Melting Point of Aluminum
You will find aluminum in different compositions. Apparently, the melting temperature varies with the composition. For instance, the melting point of pure aluminum falls within the range of 660 to 660.3°C (1220°F to 1220.5°F). The presence of impurities and processing conditions can also affect this melting temperature.
Let’s look at different aluminum alloy melting points,
1. 6061 Aluminum Melting Point
6061 aluminum is commonly used in the field of structural applications. It has a melting point around 582°C to 651°C (1080°F to 1204°F).
2. Cast Aluminum Melting Point
The melting point of cast aluminum typically ranges from 570°C to 660°C (1058°F to 1220°F). This is mostly found in aircrafts to reduce the overall weight.
3. Aluminum Foil Melting Point
The melting point of aluminum foil is approximately 660°C (1220°F) because it is usually made from nearly pure aluminum. Foil aluminum has a wide range of usage in food and insulation industries.
Figure 2: Al Melting Point
4. 3003 Aluminum Melting Point
Aluminum 3003 has the primary application in the heating and cooling systems. This alloy melts at approximately 644°C to 654°C (1191°F to 1219°F).
5. 4043 Aluminum Melting Point
Aluminum 4043 transforms from solid state to liquid typically at the range from 574°C to 632°C (1065°F to 1170°F). This melting point makes the Al 4043 suitable as a welding filler material.
6. 6063 Aluminum Melting Point
The melting point of 6063 aluminum is approximately 600°C to 655°C (1112°F to 1211°F). You can use Al 6063 in the architectural industry.
Figure 3: Aluminum Alloy Melting Point
7. 7075 Aluminum Melting Point
This aluminum changes its state in a temperature range from 477°C to 635°C (891°F to 1175°F). Al 7075 has common applications in aerospace, automotive, and industrial sections.
8. A356 Aluminum Melting Point
The A356 aluminum melt temp. ranges from 555°C to 615°C (1031°F to 1139°F). You can integrate this cast alloy in pipe housings, flywheels, and impellers.
9. 5052 Aluminum Melting Point
Aluminum 5052 melts at approximately 607°C to 649°C (1125°F to 1200°F). This alloy serves aerospace, automotive, and marine industries.
10. Aluminum Oxide melting Point
Usually, aluminum oxide has a higher melting temperature than pure aluminum because of the ionic giant lattice structures. The melting point lies around 2072 °C.
Figure 4: Aluminum Oxide Melting Temperature
Melting Temperatures of More Common Aluminum Grades
| Aluminum Grade | Description | Typical Applications | Melting Temperature (°C) | Melting Temperature (°F) |
| 1000 series | Pure aluminum (99% minimum) | Food handling, chemical equipment | 645 – 657 | 1193 – 1215 |
| 2000 series | Copper as the principal alloying element | Aircraft structures, fasteners | 502 – 638 | 936 – 1180 |
| 3000 series | Manganese as the principal alloying element | Cooking utensils, heat exchangers | 644 – 654 | 1191 – 1219 |
| 5000 series | Magnesium and chromium | Marine environments, road signs | 607 – 649 | 1125 – 1200 |
| 6000 series | Magnesium and silicon | Structural components, pipelines | 582 – 652 | 1080 – 1205 |
| 7000 series | Zinc as the principal alloying element | Aerospace applications, sports equipment | 477 – 635 | 891 – 1175 |
Figure 5: Temperature Aluminum Melts
Comparison of Aluminum Metal Melting Point with Other Metals
Aluminum has a decent melting point, considering its physical properties and fabrication features. Many other common metals, such as steel and titanium, have a higher melting point than aluminum.
Comparison of Aluminum with Titanium
Titanium’s Melting Point is near 1668°C (3034°F). It also has a much higher melting point than aluminum, indicating its resilience to high temperatures without a loss of structural integrity.
Due to their lightweight nature, both aluminum and titanium are used in aerospace components. However, titanium is mainly chosen for extreme conditions, considering its heat resistance and strength. Besides, aluminum is cheaper and readily available.
Comparison of Aluminum with Steel
Steel’s melting temperature is between 1370°C and 1538°C (2500°F to 2800°F). Aluminum is definitely easier to melt and smelt.
Aluminum is roughly 1/3 the weight of steel, making it suitable for lightweight applications. Despite its weight and high melting point, steel is a dominant material due to its economy, flexibility, and abundance.
Figure 6: Aluminum Alloy Melting Temperature
Factors Affecting Melting Point of Aluminum
Do you wonder why aluminum alloys have a different melting temperature than pure aluminum? Well, here is your answer.
1. Alloy Composition
Aluminum melting temperature varies with the alloy’s composition. Adding elements such as copper, silicon, magnesium, and zinc to the compound affects the melting behavior of aluminum alloys.
2. Presence of Impurities
Generally, impurities make it difficult to break the solid intermolecular bonds. Hence, the melting temperature rises by several degrees.
3. Processing Conditions
Additional pressure during aluminum melting will definitely affect the melting temperature. A raised pressure usually increases the melting point of the aluminum alloys.
4. Crystalline Structure
The atomic microstructure of crystalline aluminum can explain its melting behavior. During alloying or other treatments, the crystal lattice is changed, which affects the melting point.
Figure 7: Factors Influencing Aluminum Melting Point
Significance of Aluminum Melting Temperature
As an engineer, you need to consider the aluminum melting points for different aspects. For instance,
1. Manufacturing Processes
Not matching the temperature range will cause unnecessary problems in the aluminum casting, forging, and welding industries. Therefore, the melting point is crucial in the selection of proper processing methods and machinery for shaping aluminum components.
2. Energy Efficiency
Aluminum melting and casting consumes low energy due to its low melting point. This is one of the factors why the use of aluminum is favored by industries seeking energy efficiency and cost reduction.
3. Product Quality
Manipulating the melting point is vital for achieving the best quality and consistency in aluminum items. Accurate temperature management during the fabrication process reduces the risk of defects and inconsistencies in the final item.
4. Design Considerations
Knowledge of the melting point of aluminum is critical for engineers as well as designers while selecting materials for special applications. The thermal characteristics of aluminum lead to the designing of components and structures that can withstand a specific temperature during application.
Aluminum Melting Temp.: The Final Thoughts
Aluminum is abundantly used in the production industries. Knowing the right aluminum melting points allows you to control product cost and quality. At Tuling, we specialize in aluminum melting, casting, drawing, and extrusion processes. Contact us if you need a manufacturing partner for your aluminum products.
