Melting Points of Metals

In industrial applications, the choice of metal is influenced not only by mechanical properties like strength, hardness, and density, but also by thermal properties. One of the most critical thermal properties to consider is the metal's melting point.

For example, furnace components, jet engine fuel nozzles, and exhaust systems can fail catastrophically if the metal melts. Clogging of orifices or the failure of engines can occur as a result. Melting points are also crucial in manufacturing processes such as smelting, welding, and casting, where metals need to be in liquid form. This requires tooling designed to withstand the extreme heat of molten metal. Even though metals can suffer creep-induced fractures at temperatures below their melting point, designers often use the melting point as a benchmark when selecting alloys.

What is the Melting Point of Metals?

The melting point is the lowest temperature at which a solid begins to transition into a liquid under atmospheric pressure. At this temperature, both the solid and liquid phases coexist in equilibrium. Once the melting point is reached, additional heat will not increase the temperature until the metal is completely melted. This is because the heat supplied during the phase change is used to overcome the latent heat of fusion.

Different metals have different melting points, which are determined by their atomic structure and bonding strength. Metals with tightly packed atomic arrangements generally have higher melting points; tungsten, for example, has one of the highest at 3422°C. The strength of metallic bonds influences how much energy is required to overcome the attractive forces between atoms and cause the metal to melt. For instance, metals like platinum and gold have relatively lower melting points compared to transition metals such as iron and tungsten, due to their weaker bonding forces.

How to Change the Melting Point of a Metal?

A metal’s melting point is generally stable under normal conditions. However, certain factors can modify it under specific circumstances. One common method is alloying—adding other elements to a pure metal to form a new material with a different melting range. For example, mixing tin with copper to produce bronze lowers the overall melting point compared to pure copper.

Impurities can also have a noticeable effect. Even trace amounts of foreign elements can disrupt atomic bonding and shift the melting temperature, either higher or lower depending on the substance.

Physical form matters as well. Metals in the form of nanoparticles, thin films, or powders often melt at lower temperatures than their bulk counterparts due to their high surface area and altered atomic behavior.

Finally, extreme pressure can change how atoms interact, typically raising the melting point by compressing the atomic structure. While this is rarely a concern in everyday applications, it becomes a key consideration in material selection and safety evaluations for high-stress environments such as aerospace, deep-earth drilling, and high-pressure physics research.

Metal and Alloy Melting Points Chart

Melting Points of Common Metals and Alloys

Full List of Metal Melting Points（High to Low）

Key Takeaways：

• High-melting-point metals such as tungsten, rhenium, and tantalum are essential for extreme heat applications. These metals retain their structural integrity in harsh furnace and aerospace environments. Molybdenum also resists melting and is highly valuable for constructing high-temperature furnaces.

• Medium-melting-point metals like iron, copper, and steels combine manageable melting temperatures with good mechanical or electrical properties, making them versatile for construction, tooling, and electrical systems.

• Low-melting-point metals such as gallium, cesium, mercury, tin, and lead are valuable for specialized applications like solders, thermometers, and low-melting alloys.