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Bronze for Sheet Metal Fabrication

Bronze has many different uses in sheet metal components. It finds use in a range of industries such as the marine, medical, and electrical trades. This is in part due to its excellent corrosion resistance, formability, and anti-microbial properties.

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About Bronze for Sheet Metal Fabrication

Bronze is made by mixing copper with tin plus some additional alloying elements that enhance certain characteristics. Bronze for sheet metal fabrication must have high cold-workability and ideally should not work-harden too readily. Some bronze sheet materials tend to work-harden during forming and as such require annealing cycles to prevent cracks or tears during bending operations.

Bronze Sheet Metal at a Glance
ApplicationBrackets for electrical fittings, kick plates, marine components
AdvantagesGood corrosion resistance, excellent formability, antimicrobial surface
DisdvantagesExpensive and can work-harden during cold working
Lead TimeBronze is a relatively common material used in sheet metal fabrication and as such the raw material lead times tend to be reasonable.
Price$$-$$$
TolerancesBent parts achieve a cutout accuracy of +/- 0.0020” (0.0508 mm)
Sheet ThicknessSheet metal parts with a minimum wall thickness of 3/8” (9.525mm) can generally be manufactured

Bronze 220

This material is known as commercial bronze. Despite its name, the use of zinc as the main alloying element technically makes this a type of brass.  It has excellent formability, though, so it is ideal for sheet metal applications. The zinc content allows for more cold working cycles without the need for annealing. Applications can include electrical fittings, springs, and marine components.

Bronze 220 Properties
Tensile Strength, Yield (MPa)Fatigue Strength (MPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
55.2 - 117N/A49928.8

Bronze 510

This alloy is known as phosphor bronze due to the inclusion of a small amount of phosphorus. It has high yield strength when compared to other bronze alloys. This grade of bronze can be soldered, brazed, and arc-welded. Its applications include perforated sheets and electrical fasteners.

Bronze 510 Properties
Tensile Strength, Yield (MPa)Fatigue Strength (MPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
131 - 200N/A48 - 6268 - 798.86

Finishes

Xometry offers a range of surface finishes applicable to bronze sheet metal. These can include metal plating or chemical coatings that prevent oxidation. 


  • Metal plating: Bronze can be plated with a wide range of metals to increase its corrosion resistance, increase wear resistance, or improve product aesthetics. Sheet metal bronze accepts both electroplating and electroless plating, usually in chrome or nickel. Consult information on Xometry finishes to learn more about the benefit of each type of coating.
  • Clear Coating: Some manufacturers prefer to retain bronze’s natural appearance for its warm luster. Clear coats provide the surface with additional protection while not altering its coloration.
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Cost-saving Design Tips

Bronze for sheet metal fabrication can be a costly material, so its use must be optimized as much as possible.

  • DFM: Cost minimization begins at the design phase. Apply design-for-manufacturing (DFM) principles from the start in order to minimize overall fabrication expenditures. For example, allow for bend reliefs near sharply bent corners to ensure no cracks form. This is especially important for bronze as many alloys can work-harden during bending processes. Review the Xometry sheet metal design guide to learn how to achieve the required functionality using common sheet metal fabrication techniques.
  • Choose the right alloy: Bronze for sheet metal fabrication can work-harden during bending. If a part requires multiple bends close to each other it may be better to use an alloy that does not work-harden as quickly, such as Bronze 220, which hardens less quickly than higher zinc alloys like Bronze 240 and 260.
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