Nickel melts at around 1455 °C, which equals 1728 K or 2651 °F. You can find this number in most reliable sources.
This melting point marks when nickel changes from solid to liquid. It’s super important when we’re making metal mixes, building things that can withstand high heat, and using fancy new manufacturing methods.
Looking at nickel’s melting point in different ways—like how heat affects it, how pressure changes it, how it acts in combos with other metals, and what it means for factory work—gives us a better understanding of science and how things work in the real world.
What is the Melting Point of Nickel? (1455°C)
The exact melting point of pure nickel is 1455°C (2651°F). This high thermal threshold is why nickel serves as the “backbone” for superalloys used in jet engines and chemical reactors where structural integrity at white-hot temperatures is non-negotiable. According to the International Temperature Scale of 1990 (ITS-90), this value is a primary reference point for calibrating high-temperature industrial equipment.
Beyond just a single number, understanding nickel’s phase transition is critical for precision casting and CNC machining. This guide breaks down the atomic bonding that resists such heat, why 99.9% purity behaves differently than 99.99%, and how alloying elements like Chromium or Copper shift these limits in real-world applications.
| Property | Value (Metric) | Value (Imperial) |
| Melting Point | 1455°C | 2651°F |
| Boiling Point | 2913°C | 5275°F |
| Density at Melting Point | 7.81 g/cm³ | 0.282 lb/in³ |
| Heat of Fusion | 290 kJ/kg | 124.7 BTU/lb |
The Science of Nickel Melting: Atomic Structure and Bonding
Nickel’s ability to withstand 1455°C stems from its Face-Centered Cubic (FCC) crystal lattice. In this arrangement, atoms are packed with maximum efficiency, creating a high coordination number where each nickel atom is surrounded by 12 neighbors. This dense packing requires immense thermal energy to disrupt the lattice and trigger the transition from solid to liquid.
The strength of the metallic bond in nickel is amplified by its 3d electron shell configuration. The delocalized electrons create a powerful “glue” that holds the ions together even as thermal vibrations increase. Unlike materials that soften gradually, pure nickel maintains significant mechanical strength until it nears its Solidus temperature, making it a predictable material for high-heat engineering.
How Purity Levels Shape the Nickel Melting Point
Critical Impurity Effects on Melting Point
Even a 0.01% shift in composition can compromise nickel’s thermal performance. The most dangerous contaminants are Sulfur (S) and Phosphorus (P). These elements do not stay dissolved; they migrate to the grain boundaries and form low-melting-point eutectics.
For example, a Nickel-Nickel Sulfur eutectic has a melting point of only 635°C (1175°F). If your “pure” nickel contains trace sulfur, it may suffer from “hot shortness”—the material will literally crumble or crack during forging or welding long before it reaches its theoretical melting point of 1455°C.
Ultra-High-Purity Nickel for Critical Applications
In the semiconductor industry, 5N (99.999%) or 6N (99.9999%) purity nickel is mandatory for sputtering targets. At this level, the melting behavior is incredibly sharp and consistent.
Achieving this requires melting in a Vacuum Induction Furnace (VIM) at pressures below 10^-4 Pa. This environment prevents the absorption of Oxygen and Nitrogen, which can form microscopic oxides that act as nucleation sites, prematurely initiating the melting process or creating “soft spots” in thin-film applications.
Melting Points of Common Nickel Alloys: A Detailed Comparison
Pure nickel is rarely used alone in high-heat environments; instead, it is alloyed to manipulate its thermal and mechanical properties. Unlike pure metals, nickel alloys have a melting range between the Solidus (starts to melt) and Liquidus (completely liquid) temperatures.
Nickel Alloys with Lower Melting Points
Copper is the most common element used to adjust nickel’s melting threshold. In the Monel series (Ni-Cu), the addition of copper shifts the melting range down to approximately 1300°C – 1350°C. While this lowers the absolute heat resistance, it significantly improves fluid flow during casting and enhances resistance to hydrofluoric acid.
Nickel Silver (Cu-Ni-Zn) takes this further. The inclusion of Zinc drops the melting point even lower, often below 1050°C. This makes it ideal for decorative applications and musical instruments where lower-temperature processing is required without sacrificing the “silver” aesthetic.
High-Temperature Nickel Superalloys
For aerospace applications, elements like Chromium, Cobalt, and Molybdenum are added to create superalloys like Inconel 718 or Hastelloy. While these elements may slightly lower the initial melting temperature compared to pure nickel, they dramatically increase the Creep Strength.
These alloys are engineered to maintain structural stiffness at 0.7 to 0.85 of their absolute melting temperature. In these systems, the formation of the gamma'(gamma prime) phase acts as a barrier to atomic movement, allowing turbine blades to operate in environments that would cause pure nickel to deform like wax.
How to Measure Nickel Melting Point Accurately
Measuring a temperature of 1455°C with precision requires more than a standard thermometer; it requires sophisticated thermal analysis to account for phase change kinetics.
Advanced Thermal Analysis Techniques
Differential Scanning Calorimetry (DSC) and Differential Thermal Analysis (DTA) are the industry standards. These methods measure the heat flow difference between a nickel sample and a reference material. The “Onset” point on the resulting thermogram is what engineers record as the official melting point.
Key Factors Affecting Measurement Precision
The environment inside the furnace is the biggest variable in accuracy. In an open-air furnace, nickel quickly forms Nickel Oxide (NiO). This oxide layer has a much higher melting point (1955°C), which can insulate the core and lead to “lagging” or inconsistent readings.
For high-precision data, experts use Type R or Type S thermocouples (Platinum-Rhodium). However, at temperatures near 1455°C, these sensors can suffer from “sensor drift” due to grain growth in the wire. To counter this, non-contact Infrared Pyrometers are used, but they must be calibrated for the specific emissivity of liquid nickel, which changes abruptly the moment the surface turns from solid to molten.
Why Do References Disagree on Nickel’s Melting Point (1453 vs 1455°C)?
If you consult older textbooks, you will often find 1453°C cited as the melting point of nickel. However, modern industrial standards like ITS-90 (International Temperature Scale of 1990) firmly state 1455°C. This 2-degree discrepancy is not due to the metal changing, but rather the evolution of measurement science.
The older 1453°C figure originated from the IPTS-68 (International Practical Temperature Scale of 1968). As calibration technology improved, particularly through the use of high-purity fixed-point cells, researchers realized that the previous scale had a slight non-linear error at temperatures above 1000°C.
Additionally, early 20th-century experiments often used nickel samples with trace amounts of Iron (Fe) or Cobalt (Co). Even 0.1% of these contaminants can depress the melting point by several degrees. Today, using 99.99%+ purity samples and modern infrared pyrometry, 1455°C is the globally accepted technical constant.
Industrial Implications: Engineering Near the Melting Limit
In a factory setting, knowing the melting point is only the first step. You must manage the Superheat—the temperature range above the melting point—to ensure quality during processing.
Expert Guide for Casting, Forging, and Welding
For precision investment casting, engineers typically maintain a Superheat of 80°C to 150°C above 1455°C. This ensures the molten nickel has enough fluidity to fill thin-walled mold sections before it begins to solidify. If the temperature is too close to the melting point (the “mushy zone”), the metal’s viscosity increases, leading to “cold laps” or incomplete fills.
In welding nickel alloys, the primary risk is liquation cracking in the Heat-Affected Zone (HAZ). Because the grain boundaries may contain trace impurities with lower melting points (as discussed in Section 3), the edges of the weld can literally melt and separate while the bulk of the part remains solid. Controlling the heat input and using filler metals with a slightly lower melting range than the base metal is a standard industry “fix” to prevent this failure.
Extraction and Refining Parameters
During the extraction of nickel from laterite or sulfide ores, the Flash Smelting process operates at temperatures significantly higher than 1455°C to separate the nickel matte from iron slag. Precise control here is a matter of energy efficiency; every extra 10°C of unnecessary heat translates to thousands of dollars in wasted electricity or fuel in a large-scale refinery.
Quick Reference Data Chart for Engineers
To assist with thermal modeling and furnace setup, here is a summary of nickel’s behavior as it approaches and crosses its melting threshold:
| Property | Value @ 25°C | Value @ 1455°C (Solid) | Value @ 1455°C (Liquid) |
| Thermal Conductivity | 90.7 W/(m·K) | ~45 W/(m·K) | ~28 W/(m·K) |
| Specific Heat (Cp) | 0.44 kJ/(kg·K) | 0.61 kJ/(kg·K) | 0.73 kJ/(kg·K) |
| Linear Expansion | 13.4 * 10^-6°C | 18.2 * 10^-6°C | N/A (Volumetric) |
| Electrical Resistivity | 6.9 um·cm | ~60 um·cm | ~85 um·cm |
Is nickel still magnetic at its melting point?
No, nickel loses its ferromagnetic properties long before it reaches its melting point. The temperature at which nickel becomes paramagnetic is known as the Curie Point, which is 358°C (676°F). By the time it melts at 1455°C, the thermal agitation has completely disrupted the alignment of its atomic magnetic moments.
Can a propane or butane torch melt nickel?
Technically, yes, but it is difficult in practice. A standard propane torch flame can reach up to 1967°C, which is well above the 1455°C melting point. However, due to nickel’s high thermal conductivity and the heat loss to the surrounding air, a small handheld torch often cannot concentrate enough BTUs to melt a solid block of nickel. You typically need an insulated furnace or an oxy-acetylene setup to maintain the required heat density.
Why does nickel have such a high boiling point compared to its melting point?
While nickel melts at 1455°C, it doesn’t boil until 2913°C (5275°F). This massive gap (over 1400°C) exists because of the intense metallic bonding strength. It takes significant energy to break the crystal lattice (melting), but it takes even more extreme energy to completely overcome the interatomic attraction to turn the liquid into a gas.
Summary: Mastering the Heat of Nickel
Understanding the 1455°C melting point of nickel is more than a laboratory exercise; it is a fundamental requirement for modern high-temperature engineering. From the atomic FCC structure that provides its stability to the complex alloying strategies used in Inconel and Monel, nickel’s thermal profile dictates how we build everything from chemical valves to jet engines.
- Key Takeaway: Always verify the purity of your nickel source, as trace sulfur can lower the effective working temperature by nearly 800°C through eutectic formation.
- Measurement Tip: Use ITS-90 calibrated sensors and account for emissivity changes when transition from solid to liquid phases.
Looking for High-Precision Nickel Alloy Components?
Navigating the thermal complexities of nickel requires more than just data—it requires expert manufacturing. At Baosheng, we specialize in CNC machining and casting high-performance nickel alloys that withstand the most extreme industrial environments.
Frequently Asked Questions: Nickel Thermal Properties
What is the exact melting point of nickel in Fahrenheit?
The melting point of nickel is 2651°F. In Celsius, this corresponds to 1455°C. This high temperature makes nickel one of the most heat-resistant common metals, trailing slightly behind iron but significantly exceeding copper and aluminum.
Why is the melting point of nickel important for stainless steel?
Nickel is a key alloying element that stabilizes the Austenite (FCC) structure of stainless steel. By understanding its 1455°C melting point, engineers can calculate the solidus temperature of various stainless grades (like 304 or 316), ensuring the material doesn’t lose structural integrity during high-temperature welding or industrial processing.
At what temperature does nickel lose its magnetism?
Nickel loses its magnetism at its Curie temperature of 358°C (676°F). This occurs long before the metal reaches its melting point. Once nickel exceeds this temperature, it transitions from a ferromagnetic state to a paramagnetic state, meaning it will no longer be attracted to magnets.
Can you melt nickel with a standard propane torch?
Yes, a propane torch can technically melt nickel since its flame temperature reaches 1967°C, which is well above nickel’s 1455°C melting point. However, due to nickel’s high thermal conductivity, you must use an insulated crucible or a small sample size to prevent the heat from dissipating faster than the torch can apply it.
What happens to nickel’s strength as it approaches its melting point?
Nickel maintains excellent mechanical properties up to about 70% of its melting point (approx. 1000°C). Beyond this “homologous temperature,” nickel atoms gain enough thermal energy to slide more easily, leading to a rapid decrease in yield strength and an increase in creep deformation.
How does the melting point of nickel compare to cobalt?
The melting point of nickel (1455°C) is slightly lower than that of cobalt (1495°C). Because these two metals have similar atomic radii and melting behaviors, they are often used together in superalloys to provide a stable matrix that can withstand the extreme temperatures inside gas turbines.
