Iron's Melting Point: 1,538°C and Why It Varies (2026)

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At a pressure of one atmosphere, pure iron will melt at a temperature of 1,538°C. The melting point varies for most irons in practical usage .For Thermal Ceramics Cast Iron and Steel Melts lower or over a range, approximately 1127- 1204 °C for. Cast iron according to Fractory .2026. The melting temperature of iron can increase to thousands of kelvin.

You probably already know the headline number but that refers to pure iron which hardly anybody actually melts. Most sources just leave it there and don’t explain, because they are unaware of why cast iron, steel and wrought iron give different numbers, or why sources disagree by a few degrees. The 2026 reference values are the guide tell you what changes them and what it actually takes to melt iron.

Summary Points

● At normal atmospheric pressure, pure iron melts at 1,538°C (2,800°F, 1,811 K).

● Carbon and other elements alter the melting temperature of a metal, so cast iron, steel and other alloys melt lower or over a range.

● Cast iron generally has a melting point of 1,127–1,204°C. In contrast, carbon steel covers a broader range at a melting point of 1,593°C depending on composition.

● When iron cools from the melt, its crystal structure changes from bcc δ-iron to fcc γ-iron at 1,394 °C and then bcc α-iron at 912 °C (Wikipedia, Iron, 2026).

● When pressure increases, temperature also increases, and for iron, its melting point can rise dramatically. Researchers determined that HCP iron at 300 GPa has a melting temperature of about 6,144 K. [1]

● Iron is melted with the help of a furnace such as induction furnace, electric arc furnace, or cupola. Open propane torch does not provide sufficient heat.

● According to Seather Technology, melting the melting-point values highly vary from 1535°C to 1539°C, and the alloy ranges vary much more. Thus always check them.

What is Iron’s melting point in Celsius, Fahrenheit and Kelvin scale?

The melting point of iron (pure iron) at ordinary pressure is 1538°C or 2800°F or 1811 K. According to American elements, the melting point is 1538°C / 2800°F, and according to Wikipedia, it has a Kelvin value (Wikipedia, iron, 2026) of 1811 K.

These are three different representations of the same number. 1,538 × 1.8 + 32 = 2,800.4°F. To get 1,811.15 K, add 273.15 to 1,538. If your homework or spec sheet is a few degrees off it’s probably because someone rounded.

What is the reason for the 1,535 to 1,540°C reports?

The published values vary between 1535°C and 1539°C, but experts mainly use 1538°C. According to some pages, it goes up to 1540. The likely reasons for the same are given below. These are rational, not the source's explanations.

The total spread is 5°C, which is about 0.3% of 1,538. For casting and welding, that gap is less than the difference between two grades of steel.

What Is the Melting Point of Cast Iron, Wrought Iron and Steel?

Cast iron melts at around 1,127–1,204 °C, wrought iron at 1,482–1,593 °C, and steel at 1,371–1,593 °C, according to Fractory. The term "iron" actually refers to a family of alloys that all differ in the amount of carbon they contain. Because of this, one grade of iron can melt hundreds of degrees below another.

There are two trends First, cast iron is 334-411°C lower than that of pure iron. Secondly, the two cast iron ranges differ in terms of width: Fractory’s is 77°C, while Seather’s is an almost double 150°C.

The maximum temperature for wrought iron, 1,593°C, is higher than pure iron’s 1,538°C. The melting point of a pure substance is an upper limit for a clean sample. Therefore, that number looks like a loose practical range, not a measured melting point. That’s your inference from the numbers, so check the grade with the data sheet from your supplier. If you are looking to source metal for your project, the Harber Metal company overview is one way to see what a supplier works with.

Does carbon reduce the melting point of iron?

Carbon reduces the melting point of iron; this is why gray cast iron melts at around 1150–1200 °C and pure iron melts at 1538 °C (BOYI Prototyping; SS Alloys). The drop shown on the iron-carbon phase diagram shows the carbon level and temperature at which some phases exist.

Cementite (Fe3C) is the clearest marker of Cladding and it has a melting temperature of 1227 °C. This is 311 degree Celsius lower than that of pure iron. Due to the small amount of carbon present in steel, most of its structure closely resembles that of pure iron. Cast iron contains more carbon than steel, so it melts lower and over a different range .

Here is an effective approach to reading it. Low-carbon steel bar, cast iron skillet and a block of white cast iron all qualify as “iron,” but occupy different places in blacksmithing colour chart. The skillet will start melting hundreds of degrees before the bar does.

A few websites have published a simple formula that subtracts a fixed number of degrees for every percent of carbon and silicon. This guide does not include the formula since I could not verify its source. Use the grade’s data sheet for real job.

What Causes Iron to Have a High Melting Point?

The melting point of iron is high because atoms of iron held together by strong metallic bonds, and melting requires a lot of energy to loosen them. The iron heat of fusion, that is, the energy needed to melt one mole of iron, is 13.81 kJ/mol (Wikipedia, Iron, 2026).

Think of the other common metals. The melting point of copper is 1084°C and of gold is 1064°C (American Elements, 2026). Iron melts at 454°C above copper and 474°C above gold. All three have a much higher melting point than aluminum.

Gaps in celsius temperature values can be misleading because it starts anywhere. Since Kelvin starts at absolute zero, ratios work there. This is slightly under 1,357 K for copper’s melting point of 1,084 °C. Between 2000 and 3000 °C for iron’s melting point of 1,811 °C are well-known values. In a fairer way, it means more heat energy is needed for iron for degree of climb.

Whatever this guide claims is supported by sources. The bond-strength explanation is the standard one but none of the pages that I reviewed went further than that with measured detail.

What occurs to iron as it melts?

Iron's crystal structure alters multiple times with a change in temperature;this temperature is specific to each change. When molten iron cools off, it crystallizes at 1,538°C into bcc δ-iron, at 1,394°C into fcc γ-iron, and at 912°C and below into bcc α-iron (Wikipedia, Iron, 2026).

According to Wikipedia’s entry for iron, the Curie point is 1,043 K. The whole range of 912 °C to 1538 °C covers 626 °C. It only melts at the top level. Because the lower rungs are solid-state changes, a steel part can be deformed internally without ever becoming liquid.

A reader working it out in a project may apply a simple rule. When heat treating steel, pay close attention to the 912°C step. If you are casting, only the 1538°C step (or the lower figure for the alloy) applies.

How does pressure alter iron's melting point?

The melting point of iron greatly increases with pressure. According to a 2024 study, the temperature at which different phases of iron melt, namely HCP, FCC and BCC at a pressure of 300 GPa are 6144 K, 5858 K and 5647 K respectively.

The melting temperature of hcp iron is 6144 K (at 300 GPa) – Liming Zhao, Vincenzo Lordi and Amit Samanta.

Put that in simple terms. The temperature of 6,144 K is nearly equal to 5,871°C which is about 3.4 times more than its melting point at normal pressure which is 1,811 K. The pressure of 300 GPa is 3 million times more than that of atmospheric pressure. This is more of a lab and planet scale, rather than a foundry scale.

The figures aren't definitive yet. Studies estimate the temperature from 2800 K to 4100 K at 100 GPa (arXiv, 2018). The source used for the 2024 study is more than 1,300 years older than that. High-pressure values depend on models. At ordinary shop pressure, your temperature of 1,538°C is not changed by any of this.

What's the distinction between melting point and pouring temperature?

The melting point is the temperature at which solid iron begins to turn liquid. The pouring temperature is the higher temperature at which a foundry pours that metal into a mold. Real melts require superheat, which is extra heat that keeps the moving metal liquid.

Foundry furnaces that produce steel or other nickel alloys must be able to withstand more than 1,600 °C ([Wikipedia, Foundry, 2026]). It is at least 62°C higher than pure iron’s melting point. A post from a practitioner’s forum (anecdote, not from a lab) states steel pours around 3000°F. That’s about 1649 °C.

Oxides create an unusual effect. FeO has a melting point of 1,377°C and Fe3O4 (magnetite) 1,597°C. FeO and Fe3O4 have melting point ranges of 161°C and 59° respectively.

The melting of rusty or scaled scraps does not happen as one clean metal. A few oxides may become liquid early on, and a few may remain solid into the slag phase. This is reasoning from melting points, not measurement on the shop floor.

Can iron parts be manufactured without reaching their melting point?

Iron powder metallurgy gives manufacturers another option besides casting. Instead of heating iron until it flows into a mold, they compact iron or iron-alloy powders into a required shape and then heat the compact to bond the particles. Conventional solid-state sintering takes place below the alloy's melting range. That makes the 1,538°C melting point of pure iron a useful reference, but not the temperature needed for every iron manufacturing process.

Iron Powder Sintering is the heating stage that strengthens a pressed powder compact as atoms diffuse across particle contacts. Temperature, furnace atmosphere, particle size and alloying elements all influence the result. Some powder systems develop a limited liquid phase during sintering, but the component is not fully melted and poured as it would be in a foundry. The correct cycle should come from the material and part specifications.

In iron alloy metal injection molding, fine iron-based powder is blended with a temporary binder and injected into a mold to produce intricate shapes. The binder is then removed, and the remaining powder structure is sintered to develop density and strength. This route uses the alloy's sintering behavior rather than a bath of molten metal, so an alloy's melting range and its recommended furnace cycle are not interchangeable values.

Iron MIM (metal injection molding) is especially useful for small, complex components that would be difficult to form by conventional powder pressing. Designers also need to account for shrinkage during sintering, final density and material properties. Whether a part is made through iron MIM, conventional powder metallurgy or casting, its composition determines which temperature matters: the sintering conditions for powder processing or the melting and pouring temperatures for casting.

How is Iron Actually Melted?

Furnaces melt iron as opposed to open torches because the heat must be held in and be able to deliver above 1,500°C evenly. The major industrial types are blast, electric arc and induction furnaces.

Is it possible to melt iron using a propane torch?

No, an open propane torch can’t melt iron. A regular propane torch cannot achieve this, says one source. A user on the forum states that, while you can achieve cast iron temperatures with propane, it is not an efficient way to do so. A propane furnace that’s well-insulated is marginal slow. It is much easier to cast than pure iron or steel because it melts lower.

Which Type of Furnace is Used to Melt Iron?

Some foundries are switching from cupolas to induction furnaces as the former generate dust and pollutants. According to the seller of the induction furnace, the 30-60 minutes melting claim is only marketing. Posters on the forums also say that crucibles, rather than heat sources, are the limit for oil-fired home setups. That is the opinion of the practitioner.

Having a heat source is only half the job. To accomplish the remaining half, the crucible and refractory lining must survive the temperature. If you don’t have the right gear, you can’t hope to DIY successfully. Read about research and development at Harber Metal for background on materials work.

Commonly Asked Queries.

Is iron’s melting point greater than that of steel’s?

Though pure iron's melting temperature of 1,538°C is higher than most steels, it is not higher than all steels. According to Fractory, steel's melting point is between 1,371–1,593°C and so some steel grades will surpass pure iron in melting point (Fractory 2026). It’s the specific grade you’re altering the number.

What is the difference between the melting and boiling points of iron?

The melting point of iron is at 1,538 °C where it melts. The Boiling Point is the temperature at which liquid iron changes into vapor, given as 3134 K (2861 °C) (Wikipedia, Iron, 2026). Different pages give slightly different boiling values you should cite one.

How does iron compare to copper, aluminium and gold?

Iron has a higher melting point. According to American Elements 2026, copper melts at 1084 degrees Celsius. Aluminum melts at a much lower temperature. The iron’s increased property makes it necessary to use stronger furnaces and linings than copper and aluminum work.

Wrought iron usually melts between 1500 to 1600 °C (2732 to 2912 °F).

The melting point for wrought iron is 1482 – 1593 °C. Wrought iron varies from batch to batch and contains slag inclusions so treat range as approximate. If the number impacts your design, request the specific grade from the supplier.

Can you safely melt iron inside your house?

Melting iron is very risky and a home setup is usually not enough. Metal at temperatures over 1,500 °C can burn through incompatible crucibles and furnaces. Wet instruments or molds can cause violent spattering. When trying cast iron, use proper protection, dry gear and a rated furnace.

Article Summary.

Essentially, always remember the figure 1,538°C for pure iron; but remember to always check your grade before believing any number. According to different sources, the range of cast iron, steel and wrought iron, are different. In a school use 1538 degree Celsius. When casting, or buying ready made, consult supplier data sheet and select a furnace and crucible with a pouring temperature rating exceeding that of the grade.