Essential Industry Data: Copper Melting Point and Alloy Processing Tips

Pure copper melts at 1,085°C (1,984°F, 1,358 K) — the highest melting point of any copper-based material. Copper alloys melt at lower temperatures because alloying elements interrupt the pure copper crystal structure, reducing the energy required to transition from solid to liquid. Brass melts at 900–940°C; tin bronze at 850–1,000°C; beryllium copper at 866–982°C — all significantly below pure copper.

These melting point differences are not academic. They determine which casting process is suitable, what furnace temperature is required, whether a part will survive adjacent welding operations, and how much temperature margin exists between normal operating conditions and the onset of softening. This article covers the complete melting point dataset for copper and its most important industrial alloys, plus the processing implications that follow from each.

Copper Melting Point: Complete Reference Values

All values for pure copper (C10100, C10200, C11000 grades) at standard atmospheric pressure:

Unit conversions:

• °C to °F: (1,085 × 9/5) + 32 = 1,985°F (rounded to 1,984°F in most references; the exact value is 1,985°F from this formula — the 1°F discrepancy in different sources reflects the precision of the primary measurement)
• °C to K: 1,085 + 273.15 = 1,358.15 K (typically reported as 1,358 K)

Related thermal properties of pure copper:

Source: NIST Standard Reference Database (WebBook); CRC Handbook of Chemistry and Physics, 104th Edition.

Learn more:

Copper vs bronze color: How to Identify Metal Alloys

Copper Alloy Melting Points: Industrial Reference Chart

Copper alloys melt over a range rather than at a single point because they are mixtures — the solidus (temperature where solidification is complete, or melting begins) and liquidus (temperature where the alloy is fully liquid, or solidification ends) bracket the mushy zone where solid and liquid coexist.

Brass (Cu-Zn alloys)

Source: ASM Handbook Vol. 2; ASTM alloy designations.

Why zinc lowers copper’s melting point: Zinc (melting point 419°C) forms an isomorphous series with copper in the alpha-phase region (up to approximately 35% Zn). The lower-melting zinc atoms interrupt the pure copper crystal lattice, reducing the cohesive energy of the lattice and lowering the solidus and liquidus temperatures. At 40% Zn (Muntz metal), the alloy reaches the two-phase alpha+beta region, and the melting range broadens and the liquidus drops to approximately 940°C — 145°C below pure copper.

Tin bronze (Cu-Sn alloys)

The wide melting range problem: High-tin bronzes (>10% Sn) have very wide mushy zones — the range between solidus and liquidus can be 150–200°C. This wide mushy zone causes segregation (tin redistributes during solidification) and requires careful casting control (slow cooling rates, appropriate gating). The melting point listed for bronze alloys in many references is the liquidus — the temperature at which the alloy is fully liquid — not the solidus where solidification begins.

Beryllium copper (Cu-Be alloys)

Beryllium processing hazard: Beryllium copper machining, grinding, and especially welding/melting generates beryllium oxide fumes — classified as a human carcinogen and lung sensitizer. All thermal processing of BeCu alloys requires dedicated ventilation and respiratory protection. Never weld or braze BeCu without appropriate engineering controls.

Silicon bronze (Cu-Si alloys)

Silicon bronze is notable for excellent weldability (its narrow melting range and low zinc content minimize hot cracking) and excellent corrosion resistance in marine environments. It is used for architectural hardware, marine fittings, and sculpture.

Aluminum bronze (Cu-Al alloys)

Aluminum bronze has the highest melting point of the major copper alloy families — closer to pure copper’s 1,085°C than brass or tin bronze. This high melting point, combined with excellent corrosion resistance (the aluminum content forms a protective Al₂O₃ oxide analogous to the passive layer on aluminum alloys), makes aluminum bronze suitable for pump impellers, propellers, valve seats, and other corrosion-critical applications.

Cupronickel (Cu-Ni alloys)

Cupronickel melts above pure copper. Nickel (melting point 1,455°C) raises the copper melting point when added. 70/30 cupronickel at 1,170–1,240°C requires higher furnace temperatures than pure copper and most other copper alloys. This elevated melting point contributes to cupronickel’s use in marine heat exchangers and coinage (the U.S. quarter-dollar is cupronickel plated on copper).

Processing Implications of Copper Melting Points

Casting

Pouring temperature: Castings are poured at a temperature 50–150°C above the liquidus to provide superheat — the temperature buffer that ensures the metal remains fully liquid throughout the mold-filling process. For C26000 brass (liquidus 955°C): pour at 1,000–1,100°C. For pure copper (melting point 1,085°C): pour at 1,150–1,200°C.

Wide melting range alloys (C91300, high-tin bronze): Require careful attention to gating design. The wide mushy zone (solidus 830°C, liquidus 1,000°C) means the metal is partially solid during much of mold filling — risers must be large and well-heated to feed the shrinkage continuously through the 170°C solidification range.

Short-range alloys (C65500 silicon bronze): The narrow 55°C melting range makes silicon bronze easy to cast — the entire mold fills while the metal is fully liquid, and solidification occurs quickly with minimal segregation.

Welding and brazing

Copper welding: Pure copper’s 1,085°C melting point, combined with its very high thermal conductivity (401 W/(m·K)), makes welding difficult — heat dissipates so rapidly from the joint zone that preheating to 300–500°C is required to prevent the base metal from quenching the weld pool before fusion is achieved. GTAW (TIG welding) with argon shielding is the standard process for precision copper welding.

Brass brazing: Brass alloys with high zinc content (>20% Zn) cannot be welded by conventional fusion welding because zinc vaporizes (boiling point 907°C) before the brass reaches its melting point, producing zinc fumes and porosity. Brazing (at temperatures below the solidus but above the braze alloy’s liquidus) is the standard joining method for high-zinc brass. Silver brazing alloys (BAg-1: solidus 620°C, liquidus 705°C; BAg-45: 690–775°C) are commonly used.

Beryllium copper spring components: The T6 (peak-aged) condition of BeCu alloys has yield strength of 1,100–1,380 MPa. Welding destroys this condition in the HAZ, reducing local strength by 50–70%. If BeCu components must be joined by welding (rather than brazing or mechanical fastening), the weld zone must be re-aged after welding to restore properties — a complex and expensive re-heat treatment.

Learn more:

How the Melting Point of Copper Directly Impacts Laser Welding Processes

Thermal service temperature limits

The melting point sets the absolute upper limit of thermal service; practical structural service is limited by the onset of softening or recrystallization — typically 40–60% of the melting point in Kelvin (the homologous temperature rule of thumb).

For pure copper (T_m = 1,358 K): practical upper service temperature = 0.5 × 1,358 = 679 K = 406°C

However, pure copper retains only approximately 50% of its room-temperature strength at 300°C, and the practical structural service limit for most copper applications is 150–200°C.

For brass (T_m ≈ 1,200 K average): practical service limit ≈ 0.5 × 1,200 = 600 K = 327°C — brass remains adequately strong to approximately 200–250°C.

Copper vs. Competing Materials: Melting Point Comparison

Frequently Asked Questions About Copper Melting Point

Q: What is the melting point of copper?

Pure copper melts at 1,085°C (1,984°F, 1,358 K) at standard atmospheric pressure. This is the melting point for any high-purity copper grade (OFHC copper C10100, electrolytic tough-pitch C11000). Copper alloys melt at lower temperatures: brass (copper-zinc) at 900–1,050°C depending on zinc content; tin bronze at 830–1,060°C; silicon bronze at 970–1,025°C; aluminum bronze at 1,010–1,075°C.

Q: At what temperature does copper become soft?

Copper begins to lose strength (softens measurably) above approximately 200°C. Annealing (recrystallization of cold-worked copper) begins at approximately 120–200°C depending on prior cold work and grain size. At 400°C, copper retains only approximately 30–40% of its room-temperature strength. For applications requiring maintained strength above 200°C, beryllium copper or cupronickel alloys with higher service temperature capability are preferred.

Q: Why does brass have a lower melting point than pure copper?

Brass (copper-zinc alloy) has a lower melting point because zinc (melting point 419°C) disrupts the pure copper crystal lattice, reducing the cohesive energy needed to transition from solid to liquid. The effect is proportional to zinc content: 10% zinc reduces the melting point by approximately 35°C; 30% zinc reduces it by approximately 130°C; 40% zinc reduces it by approximately 145°C below pure copper’s 1,085°C.

Q: What temperature does copper turn red?

Copper begins to show visible red-orange incandescence at approximately 700–800°C (the temperature at which thermal radiation enters the visible spectrum). At its melting point (1,085°C), liquid copper is a bright orange-red. The “red copper” color at room temperature is a surface optical property (not incandescence); it does not require elevated temperature.

Q: Can you melt copper with a propane torch?

Propane torches typically achieve flame temperatures of approximately 1,900–2,000°C in the flame core, which is above copper’s 1,085°C melting point. However, a propane torch can melt small quantities of copper (copper sheet, copper wire, small castings) — the challenge is not the maximum flame temperature but the total heat input rate. For significant quantities of copper (more than a few hundred grams), a dedicated furnace with controlled temperature is more practical than an open flame because of heat losses and the difficulty of maintaining the copper at uniform melting temperature with an open torch.

References

1. National Institute of Standards and Technology (NIST), NIST Standard Reference Database 69: NIST Chemistry WebBook, webbook.nist.gov. (Pure copper melting point, boiling point, latent heats of fusion and vaporization, specific heat, and thermal conductivity — the primary government reference for pure metal thermophysical properties cited in the complete thermal properties table.)
2. Haynes, W.M., ed., CRC Handbook of Chemistry and Physics, 104th Edition. CRC Press, Boca Raton, FL, 2024. (Melting point and latent heat data for pure copper and all major copper-base alloy families; liquidus and solidus temperature tables for brass, bronze, and cupronickel — the comprehensive chemical and physical properties reference for the alloy melting range data.)
3. ASM Handbook, Volume 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials, 10th Edition. ASM International, Materials Park, OH, 1990. (Liquidus and solidus temperatures for all copper alloy families: brass (UNS C22000–C28000), tin bronze (C51000–C52400), silicon bronze (C65100–C65500), aluminum bronze (C60800–C95400), cupronickel (C70600–C71500), beryllium copper (C17200–C17500); processing implications of melting ranges for casting, welding, and brazing.)
4. ASTM B152/B152M, Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar, ASTM International, current edition. (Composition requirements for C10100, C10200, C11000 electrolytic tough-pitch copper — the material standard establishing the specific copper grades whose melting point is 1,085°C; purity requirements and processing temperature limits.)

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Dr. Liu Che

Dr. Liu Che holds a Ph.D. in Engineering from Dalian University of Technology and completed postdoctoral research at the Mechanical Engineering Postdoctoral Fellowship of Harbin Institute of Technology. His research focuses on core algorithms for large-scale laser equipment integration, laser cladding remanufacturing, and real-time intelligent monitoring systems for processing. He possesses profound academic expertise in cutting-edge fields such as laser beam spatial shaping and the mechanism analysis of laser processing of special alloys. He has led numerous solutions to technical challenges in cutting and surface modification of high-hardness materials in the heavy machinery industry, demonstrating strong theoretical foundations and outstanding engineering implementation capabilities.

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