ThePipingMart Blog Grades 655 Bronze (C65500) – Composition, Properties, and Uses

655 Bronze (C65500) – Composition, Properties, and Uses

Bronze 655

Bronze C65500 is a metal alloy composed of copper and zinc, and it has a variety of physical, mechanical, and chemical properties that make it perfect for many applications. In this blog post, we’ll explore the composition of Bronze 655, its chemical properties, its mechanical properties, its physical properties, its uses in industry, its corrosion resistance and heat resistance, as well as how to machine it and weld it.

What Forms is Bronze 655 Available at Piping Mart?

  • Bronze 655 Bolts
  • Bronze 655 Fasteners
  • Bronze 655 Nuts
  • Bronze 655 Screw
  • Bronze 655 Stud Bolts
  • Bronze 655 Washers

655 Bronze Composition

C65500 Bronze is composed primarily of copper (Cu) and zinc (Zn). It also contains trace amounts of tin (Sn), phosphorus (P), lead (Pb), antimony (Sb), bismuth (Bi), arsenic (As), nickel (Ni), and iron (Fe). The specific ratio of these elements varies depending on the manufacturer, but generally, the ratio is 77-81% Copper to 19-23% Zinc.

Component Wt. %
Cu 97
Fe Max 0.8
Mn Max 1.5
Ni Max 0.6
Pb Max 0.5
Si 2.8 – 3.8
Zn Max 1.5

Alloy 655 Chemical Properties

Bronze C65500 Alloy has a high corrosion resistance due to its low water solubility, making it ideal for applications where corrosion is an issue. It also has excellent wear resistance due to the hardness of bronze alloys which provides long-lasting protection against abrasive wear. It also has good electrical conductivity, making it useful for electrical components such as connectors or switches.

Chemical properties
Cu 96 – 99
Si 1 – 4

655 Bronze Mechanical Properties

The mechanical properties of Bronze 655 include high tensile strength and good ductility, which make it suitable for applications that require both strength and flexibility, such as springs or shafts. It also has good machinability, so parts made from this alloy can be easily fabricated using traditional machining methods such as turning or milling. Finally, Bronze 655 also has good weldability, so parts made from this alloy can be combined using welding techniques such as TIG or MIG welding.

Mechanical Properties
Hardness, Rockwell B 95 95  
Tensile Strength, Ultimate 745 MPa 108000 psi
Tensile Strength, Yield 415 MPa 60200 psi 0.5% extension under load
Elongation at Break 13% 13% In 50 mm
Modulus of Elasticity 105 GPa 15200 ksi
Poisson’s Ratio 0.346 0.346
Machinability 30% 30% UNS C36000 (free-cutting brass) = 100%
Shear Modulus 39 GPa 5660 ksi
Shear Strength 425 MPa 61600 psi

655 Bronze Physical Properties

The physical properties of UNS C6550 include high thermal conductivity. Hence, parts made from this alloy are ideal for applications where heat needs to be transferred away quickly, such as engine blocks or heat exchangers. It also has high electrical conductivity making it useful for components that need to carry large amounts of electricity, such as motors or generators. Finally, bronze alloys are non-magnetic, meaning they can be used in applications where magnetic interference is an issue such as medical devices or navigation systems.

Melting Point – Liquidus°F 1880 Melting Point – Liquidus°F 1880
Melting Point – Solidus°F 1780 Melting Point – Solidus°F 1780
Densitylb/cu in. at 68°F 0.308 Densitylb/cu in. at 68°F 0.308
Specific Gravity 8.53 Specific Gravity 8.53
Electrical Conductivity% IACS at 68°F 7 Electrical Conductivity% IACS at 68°F 7
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 21 Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 21
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 10 Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 10
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09 Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 15000 Modulus of Elasticity in Tensionksi 15000
Modulus of Rigidityksi 5600 Modulus of Rigidityksi 5600

C6550 Bronze Equivalent

  • ASME SB315
  • ASME SB96
  • ASME SB98
  • ASTM B100
  • ASTM B105
  • ASTM B124
  • ASTM B283
  • ASTM B315
  • ASTM B432
  • ASTM B96
  • ASTM B98
  • ASTM B99
  • ASTM F467
  • SAE J461
  • SAE J463
  • UNS C6550

Bronze 655 Specifications

Bronze 655 Bar SAE J463, J461
Bronze 655 Bar, Forging ASTM B124
Bronze 655 Bar, Rolled, Pressure Vessels ASME SB96, ASTM B96
Bronze 655 Bolts ASTM F468
Bronze 655 Forgings, Die ASTM B283
Bronze 655 Nuts ASTM F467
Bronze 655 Pipe ASME SB315, ASTM B315
Bronze 655 Plate ASME SB96, ASTM B96
Bronze 655 Plate, Bridge and Bearing ASTM B100
Bronze 655 Plate, Clad ASTM B432
Bronze 655 Plate, Pressure Vessels ASME SB96, ASTM B96
Bronze 655 Rod ASME SB98, ASTM B98, SAE J461, J463
Bronze 655 Rod, Forging ASTM B124
Bronze 655 Screws ASTM F468
Bronze 655 Shapes ASME SB98, ASTM B98, SAE J461, J463
Bronze 655 Shapes, Forging ASTM B124
Bronze 655 Sheet ASME SB96, ASTM B96, SAE J461, J463
Bronze 655 Sheet, Bridge and Bearing ASTM B100
Bronze 655 Sheet, Pressure Vessels ASME SB96, ASTM B96
Bronze 655 Strip ASME SB96, ASTM B96, SAE J461, J463
Bronze 655 Studs ASTM F468
Bronze 655 Tube ASME SB315, ASTM B315, MILITARY MIL-T-8231
Bronze 655 Wire ASTM B105, B99

655 Bronze Uses

Bronze has many varied applications, with more and more uses being discovered daily by inventors. This sturdy alloy is made of copper and tin, and it’s been valued since ancient times for its durability and corrosion resistance. C65500 remains popular in industries ranging from construction to sculpture because it can be easily molded thanks to its malleability. It’s also used in various applications as a bearing material because of its high load-bearing capacity. Also, bronze 655 is great for saltwater environments since it doesn’t degrade like iron. All these wide-ranging uses make bronze an excellent choice for any application where strength, reliability and affordable pricing are a must!


Bronze has been used to create jewelry for thousands of years. Bronze is an ideal material for jewelry as it is strong and durable yet still relatively soft and easy to work with. Additionally, bronze does not rust or tarnish like other metals, making it ideal for creating long-lasting pieces.


Bronze is also commonly used to create sculptures. When creating a sculpture out of bronze, an artist first creates a model out of clay or another malleable material. This model is then used to create a mold filled with molten bronze. Once the bronze has cooled and hardened, the mold is broken away to reveal the finished sculpture.


Bronze has also been traditionally used to create coins. The first coins were made out of bronze over 2,500 years ago in China. Bronze coins continued to be used worldwide for centuries until they were eventually replaced by more modern materials such as copper and nickel.

Musical Instruments

655 Bronze is also a common material used in musical instruments. Many brass instruments, such as trumpets and trombones, are made at least partially out of bronze. Bronze is also often used to make cymbals, producing a clear and distinct sound when struck.


Bronze has also been used to create weapons since ancient times. Bronze swords were some of the first weapons created and were used by many civilizations including the Egyptians, Greeks, and Romans. Bronze was eventually replaced by iron as the primary material for weapons due to its greater strength and hardness.


Bronze Material has also been commonly used to create tools throughout history. Early humans likely used bronze tools such as spears and knives for hunting and fighting. Later on, bronze tools were used for more mundane tasks such as farming and carpentry. Today, bronze tools are still occasionally used for certain applications where their durability is advantageous, such as in shipbuilding.

Corrosion Resistance

Bronze 655 is an alloy that offers superior corrosion resistance compared to other alloys, making it a preferred choice for industries that require components and equipment coming into contact with severe corrosive environments. Applications for these include potable water systems, desalination plants, marine industry, bridges, and anywhere protection from oceanic salts and the atmosphere is required. The beauty of Bronze 655 lies in its high molybdenum content, which provides excellent resistance to salinity and oxidation levels. This ensures greater stability over time with minimal maintenance or repair – living up to the title of being both a cost-effective and long-lasting alternative alloy.

Heat Resistance

The properties of bronze 655 provide incredible heat resistance, making it a valuable material for many applications. This durable alloy has a high melting point and is resistant to corrosion and abrasion. It is often used in power plants, smelters, pump housings and other industrial applications that encounter tough conditions. Conventional machining delivers a longer tool life due to its advantageous hardness characteristics. Its hardness also allows designers to create complex shapes without experiencing fatigue failure in the structure. Unsurpassed thermal conductivity further makes bronze 655 an ideal choice for a wide range of applications that require heat-resistant components.

Heat Treatment

Heat treatment is an important process for working with bronze 655. The heat helps reduce the metal’s crystals, allowing for superior strength and improved wear resistance. Bronze 655 is often heated in a furnace or a kiln at temperatures up to 950 degrees Celsius to achieve maximum strength. Once the material has been heated and quenched, it can then be tempered in a controlled environment where hardening of the material is possible. Heat treatment of bronze 655 is an essential step in ensuring superior quality parts that will stand up over time.


Bronze 655 machining is a precise yet challenging process that requires considerable skill and experience for quality results. While it is considered an easy-to-machine alloy with excellent machinability and corrosion resistance properties, its hardness can lead to premature tool wear if not properly treated. To combat this issue, machinists performing the task must understand inordinate amounts of additional data about the alloy that goes far beyond just temperature requirements for optimal machining performance. From understanding strain hardening to selecting proper speeds and feeds, precision with Bronze 655 machining from skilled workers is essential for success.


If you are looking for a reliable, strong weld to complete a project, bronze 655 welding’s may be the perfect solution. This type of welding is very cost-effective; the weld produced is also relatively corrosion-resistant and long-lasting. It also has great electrical conductivity, making it ideal for projects where electrical components will be used. Furthermore, bronze 655 easily combines with other materials like steel and brass – this capability enables versatile design possibilities and helps make more complex shapes possible during production. All of these factors make Bronze 655 welding a top choice among experienced welders and an excellent option when tackling difficult projects around the home or workshop.


From its composition to its mechanical properties, there’s no denying that Bronze 655 is an excellent material choice for many applications thanks to its combination of strength and flexibility and excellent corrosion and heat resistance. Its ability to be machined and welded make fabrication easy, while its non-magnetic nature allows for use in areas where magnetic interference may be an issue. All these attributes, combined with a relatively low cost compared to other materials, makes bronze alloys like Bronze 655 a great choice for engineers looking for a reliable material solution to their design problems!

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