Melting Point of Bronze: Complete Guide to Alloy Temperatures and Grade Ranges

Content

1 Quick Reference: Melting Ranges for Common Bronzes
2 Why Composition Changes the Melting Point
3 What Melting Point Means for Bronze Components
4 Selecting a Bronze Grade: Start With the Application, Not Just the Number

Bronze has never had a single melting point. In practice, most bronze alloys melt between roughly 850°C (1,562°F) and 1,050°C (1,922°F), and a typical tin bronze with 12% tin melts near 900°C (1,652°F). That broad range is why “bronze” on a drawing is not enough for a foundry or a design review. The exact composition determines the component’s melting behavior, and that behavior determines how you cast, weld, machine, and eventually service the part.

For engineers and purchasers who work with bronze bushings, bearings, sealing rings, plates, and worm gears, the practical question is not “what is the melting point of bronze?” but “what is the melting point of the bronze grade I intend to use?”

Quick Reference: Melting Ranges for Common Bronzes

The table below is a useful planning guide. Exact melting behavior depends on the supplier’s specification, heat treatment, and trace elements, so always confirm the grade before setting casting or operating limits.

Typical melting ranges for common bronze families. Confirm the exact grade before making process decisions.
Bronze family	Typical composition	Representative melting range	Common applications
Tin bronze	88% Cu / 12% Sn	~900°C (1,652°F)	Marine bushings, steering gears, anchor winch bearings
Aluminum bronze	90% Cu / 10% Al	~1,027–1,038°C (1,881–1,900°F)	Rudder transmission systems, heavy-duty plates, mining equipment
Bearing bronze	Cu with Pb, Sn, Zn	~977°C (1,790°F)	Sliding bearings under moderate loads
Leaded bronze	Cu with 18% Pb / 7% Sn	~800–900°C (1,472–1,652°F)	Low-melting, free-machining bearing alloys
Phosphor bronze	Cu-Sn-P	~950–1,050°C (1,742–1,922°F)	Corrosion-resistant components and spring-like parts

The spread is not cosmetic. The difference between a leaded bronze at roughly 850°C and an aluminum bronze at roughly 1,038°C can change your casting approach, your tooling choices, and the thermal margin a component can tolerate in service.

Why Composition Changes the Melting Point

Pure copper melts at 1,084°C (1,983°F). When you add tin, lead, aluminum, or other elements, you interrupt the regular arrangement of copper atoms. The material no longer changes from solid to liquid at one temperature. Instead, it has a solidus, the temperature at which melting starts, and a liquidus, the temperature at which the alloy is fully liquid.

This is why a single melting-point chart can only give averages. Even a simple tin bronze begins to melt at its solidus and only becomes fully fluid above its liquidus. Casting temperatures need to stay above the liquidus for the alloy to fill the mold completely.

The main alloying elements behave in predictable ways:

Tin lowers the melting range and increases strength and hardness, which is why tin bronze remains a first choice for marine driveline bushings.
Lead lowers the melting range further and improves machinability, but excessive lead can reduce hot strength.
Aluminum raises the melting range and forms a protective oxide layer, making aluminum bronze useful in seawater, mining, and heavy-load applications.
Nickel and iron are added to selected grades to improve wear resistance and hot strength, and they shift the liquidus as well.

When a supplier reports “melting point approximately 950°C,” treat it as a useful simplification, not an absolute process limit. For engineering decisions, ask for the solidus and liquidus values and the recommended pouring temperature.

What Melting Point Means for Bronze Components

For a finished bronze component, the melting point does not set the maximum running temperature of the bearing surface. Most equipment operates far below that limit. But the melting range still matters for three practical reasons: it controls foundry practice, it identifies whether the alloy has enough thermal margin for the application, and it warns you about metallurgical changes if the part overheats during grinding, welding, or extreme sliding contact.

Tin bronze for marine drivelines and steering gear

Tin bronze has a moderate melting range around 900°C, which makes it reliable to cast into bushing geometries and stable when exposed to seawater. It is a classic choice for ship propulsion systems, steering gear, and anchor winch bearings because the alloy still holds its bearing surface under heavy shock loads and in a corrosive environment.

Tin Bronze Bushing for Marine Propulsion and Rudder SystemsThis seawater-resistant bushing is designed for ship propulsion shafting and rudder bearings, offering high wear resistance and self-lubricating properties to reduce friction and extend equipment life under heavy shock loads.View Product →

Aluminum bronze when loads and corrosion are severe

Aluminum bronze melts in a higher range, typically around 1,027–1,038°C. That extra thermal margin, combined with a protective oxide film, makes it useful in rudder transmission systems, ship hydraulic cylinders, and mining equipment where sand, water, and high local pressure attack the bearing surface.

Aluminum Bronze Bushing for Rudder Transmission in Harsh ConditionsEngineered for rudder transmission systems, this bushing combines high strength, corrosion resistance, and fatigue tolerance, making it suitable for high-load, high-speed, and corrosive marine environments.View Product →

Copper alloy worm gears: heat, friction, and material stability

Worm gears slide against a steel worm and generate more frictional heat than standard gear sets. Bronze worm wheels are specified because of their low adhesion to steel, not because of an exceptionally high melting point. A copper alloy worm gear used in gear-hobbing machines and finishing machines must be poured cleanly and cooled under control, because porosity created during casting shortens gear life under repeated thermal cycling.

Copper Alloy Worm Gear for Precision Machine Tool DrivesPrecision-manufactured worm gear for gear hobbing and finishing machines, featuring high tooth accuracy and controlled casting to prevent porosity, ensuring reliable power transmission and long service life.View Product →

Selecting a Bronze Grade: Start With the Application, Not Just the Number

A melting-point chart tells you that bronze can melt between 850°C and 1,050°C, but it does not tell you whether the grade can survive abrasive slurry, saltwater, shock loading, or constant sliding contact. The engineering approach is to fix the operating conditions first—load, speed, temperature, corrosion, lubrication—and then choose the alloy with the right combination of melting range, mechanical strength, and wear resistance.

At Yangzhou Yifeng Copper Products, we have produced copper alloy components since 2005 and built our process around that selection logic. Each tin bronze, aluminum bronze, brass, self-lubricating, and worm gear grade is matched to its operating environment before it is cast or machined. For a closer look at how that experience shapes our material specifications, see our company background. If you are reviewing a new bronze component, contact our engineering team with the operating temperature, load, and environment, and we can help you translate a melting-point value into a practical bronze grade.