Bronze

Leveraging our bronze processing expertise, we fulfill component requirements across the mechanical, precision instrumentation, and aerospace sectors. Contact us today to discuss your custom bronze needs!

Tolerances : ±0.002”

Other type bronze available in Weldo : Tin bronze,Aluminum bronze, bearing bronze, lead-tin bronze(C952,C932,C642,C863)

Physical Properties of Different Bronze Type

Bronze allows for the adjustment of constituent ratios to create alloys with diverse material properties. The following lists common bronze alloys, along with their names and performance parameters.

Material	Grade (Standard)	Tensile Strength (MPa)	Fatigue Strength (MPa)	Hardness	Density (g/cm³)	Notes
Tin Bronze	CuSn10 (EN CC480K / GB equivalent)	≈ 320	≈ 110	≈ 100 HB	≈ 8.8	Cast tin bronze
Tin Bronze (Phosphor Bronze)	CuSn6 (ASTM B103 / UNS C51900)	500–765	≈ 165–255	174–210 HB	≈ 8.84	Wrought, temper dependent
Aluminum Bronze	CuAl10Fe3 (EN CW307G / GB equivalent)	610–760	≈ 200–250	160–230 HB	7.5–7.8	Cast / forged dependent
Nickel Aluminum Bronze	CuAl11Ni6Fe5 (ASTM B150 / UNS C63000)	≈ 760	≈ 255	≈ 94 HRB	≈ 7.58	High-strength aluminum bronze
Bearing Bronze	CuPb15Sn8 (ISO 4382 / similar to UNS C93800)	170–220	≈ 69	60–65 HB	≈ 9.25	High-lead bearing bronze
Leaded Tin Bronze (Gunmetal)	CuSn5Zn5Pb5 (EN CC491K)	200–270	≈ 65–90	60–70 HB	8.8–8.9	Cast gunmetal
Leaded Tin Bronze (SAE 660)	CuSn10Pb5 (ASTM B505 / UNS C93200)	≥ 241	≈ 110	≈ 65 HB	8.8–8.9	Standard bearing bronze

Surface finishes for bronze parts

Bronze offers excellent corrosion resistance, but Weldo enhances its durability and appearance with sandblasting, polishing, painting, electroplating, and chemical coating.

PROCESS	DESCRIPTION
Electroplating	Plating a layer of metal onto the bronze surface to enhance its properties. Options include copper plating, nickel plating, and chromium plating.
Chemical Polishing	Immersing bronze parts in a chemical polishing solution to remove stains, impurities, and oxide layers, resulting in a bright surface and enhanced corrosion resistance.
Passivation	Forming a dense oxide film on the bronze surface using chemical or electrochemical methods to isolate it from air and moisture, improving corrosion resistance.
Wire Drawing	Creating textured lines on the bronze surface using grinding tools, such as straight lines, random lines, or wavy lines, providing both decorative and anti-slip properties.
Polishing	Grinding and polishing to make the bronze surface smooth and flat, improving gloss and finish.
Spray Coating	Spraying epoxy resin, polyurethane, or other anti-corrosion coatings to form a protective layer, suitable for parts used outdoors or in harsh environments.
Black oxide	Heating bronze parts in air-water vapor or chemical solutions forms a blue or black anti-corrosion oxide film on their surface.
Chemical Coloring	Reacting bronze with chemical solutions to create colored oxide films, such as brown or blue.
Composite Coating	Adding nanoparticles (such as SiC and Al₂O₃) during electroplating creates a composite coating, enhancing wear resistance and scratch resistance, suitable for parts subject to frequent friction.

Pros and Cons of Bronze Materials

Pros

1. Good machinability: Bronze is relatively soft, with low cutting resistance. It causes less tool wear and suits complex-shaped parts.
2. Excellent wear resistance: Tin-containing bronze has moderate surface hardness, making machined parts ideal for friction components like bearings and gears.
3. Strong corrosion resistance: Better than ordinary steel in air, seawater, etc., suitable for outdoor or humid environments.
4. Good thermal and electrical conductivity: Retains bronze’s inherent properties, fit for heat-dissipating or conductive parts.
5. High dimensional stability: Minimal post-machining deformation, ensuring high precision for precision parts.

Cons

1. High material cost: Bronze is more expensive than steel, aluminum, etc., leading to cost pressure in mass production.
2. High density: Machined parts are heavy, which may increase overall equipment weight—unsuitable for lightweight needs.
3. Limited machining efficiency: Though easy to cut, high-hardness bronze alloys (e.g., aluminum bronze) may cause tool adhesion during high-speed machining.
4. Surface treatment limitations: Some bronze alloys have average post-machining gloss; extra polishing is needed for high decorativeness.

Application Fields of Bronze Parts

Industrial Machinery and Transmission Sector: Bearings and gears to enhance machinery performance.

Marine Engineering and Shipbuilding Sector: Propulsion systems and instrument accessories.

Aerospace Sector: Valve bodies and bushings.

3C Electronics Sector: Connectors, terminals, and heat sinks for electronics.

FAQ about Bronze Material

What type of material is bronze?

Bronze is an alloy primarily composed of copper and tin, to which other elements may be added. Characterized by high strength, excellent castability, and corrosion resistance, it is widely utilized in fields such as machinery, shipbuilding, and electrical engineering.

Is Bronze Magnetic?

Bronze is not magnetic. Bronze is an alloy of copper and tin; since both copper and tin are non-ferromagnetic substances, bronze as a whole does not possess magnetic properties. This characteristic gives bronze significant advantages in applications where resistance to magnetism is required—such as in the electronics industry and the manufacturing of precision instruments—making it ideal for producing components like anti-magnetic parts and spring contacts.

Does bronze scratch easily?

Bronze possesses relatively low hardness and a soft surface, making it susceptible to scratching; specifically, bronze alloys with a higher tin content tend to be softer and even more prone to scratches. The addition of other elements—such as aluminum or zinc—can increase the hardness of bronze, thereby enhancing its resistance to scratching. Furthermore, the application of coatings or plating treatments can create a protective film on the bronze surface, guarding against scratches and abrasion.