ThePipingMart Blog Grades 630 Bronze (UNS C63000) – Composition, Properties, and Uses

630 Bronze (UNS C63000) – Composition, Properties, and Uses

Bronze 630

Bronze 630 is a copper-based metal alloy that is composed of 63% copper, 1.2% lead, and 35.8% zinc. It’s a popular material used in many industries because of its strength and durability. Let’s dive into this bronze alloy’s composition, properties, uses, and more.

What Forms is 630 Bronze Available at Piping Mart?

  • Bars
  • Bolts
  • Pipes
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings

630 Bronze Chemical Composition

Bronze 630 has 63% copper, 1.2% lead, and 35.8% zinc as its main components; however, it can also contain small amounts of aluminum and iron as well. The combination of these metals gives bronze 630 excellent corrosion resistance properties and makes it an ideal option for outdoor use or in corrosive environments.

Chemistry Information
Cu 76.8 – 85
Ni 4 – 5.5
Al 9 – 11
Fe 2 – 4
Mn 0 – 1.5
Zn 0 – 0.3
Residual 0 – 0.5
Sn 0 – 0.2
Si 0 – 0.25

630 Bronze Chemical Properties

The chemical properties of bronze 630 are determined by its composition, with copper being the most prominent element at 63%. This gives it good electrical and thermal conductivity, making it useful in electrical components and heat exchangers, respectively. It also has low wear resistance but can withstand high temperatures without corroding or losing its structural integrity.

630 Bronze Mechanical Properties

UNS C63000 is highly regarded in the metalworking industry for its toughness and strength, especially in high-temperature operations. Developed as an improvement on traditional bronzes, this alloy has superior corrosion resistance and higher tensile strength than other similar materials. In addition to its impressive durability, the Bronze 630 is notable for its good electrical conductivity, making it a top choice for engineering applications involving electricity. Its machinability is also quite remarkable, facilitating faster production processes with less wear and tear associated with conventional machining techniques. With all these properties blended together, it’s no surprise that the Bronze 630 continues to be used in many industries.

Properties Metric Imperial
Tensile strength 760 MPa 110000 psi
Yield strength 470 MPa 68200 psi
Elongation at break (in 50 mm, 10% reduction in area) 10% 10%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Reduction of area (at 316°C/601°F, cold finished) 9% 9%
Shear modulus 44.0 GPa 6380 ksi
Fatigue strength (at number of cycles 1.00e+8, reverse bending) 255 MPa 37000 psi
Hardness, Rockwell B 94 94
Machinability (UNS C36000 (free-cutting brass) = 100) 30 30

630 Bronze Physical Properties

630 Bronze is an alloy with copper, lead and tin as its major constituents. It can also include small amounts of aluminum, phosphorus and silicon. Bronze 630 has excellent malleability and excellent flow properties that make it suitable for hot-forming applications. It maintains its strength at high temperatures and is resistant to corrosion, wear and impacts. The hardness of this alloy is medium-hard, making it suitable for many processes like forging or machining. It additionally has a good tensile strength, allowing it to handle pressure well during the working process. Overall, Bronze 630 is a versatile alloy that easy to work with along with superb physical properties such as strength at high temperatures and good wear resistance.

Physical Properties 630
Density 0.274 lb/in3
Ultimate Tensile Strength 110 ksi
Yield Tensile Strength 68.2 ksi
Shear Strength 61 ksi
Shear Modulus 6,380 ksi
Hardness Rockwell | Brinell B94 | 203
Elongation at Break Percentage 10%
Modulus of Elasticity 16,700 ksi
Poisson’s Ratio 0.33
Machinability Percentage 30%
Melting Point 1,895-1,931 °F
Specific Heat 8.96 x 10^-2 BTU/lb-°F
Thermal Conductivity 262 BTU-in/hr-ft^2-°F
Electrical Conductivity 7% IACS

630 Bronze Equivalent

  • UNS 63000
  • CDA 630
  • C630
  • ISO CuAl10Ni5Fe4
  • Aluminum Bronze E
  • ASME SB150
  • ASME SB171
  • ASTM B124
  • ASTM B150
  • ASTM B171
  • ASTM B283
  • ASTM F467
  • ASTM F468
  • MIL B-16166
  • QQ C450
  • SAE J461
  • SAE J463.

Bronze 630 Specifications

End Product Specification
Bronze 630 Bar AMS 4640, ASME SB150, ASTM B150, FEDERAL QQ-C-450, SAE J463, J461
Bronze 630 Bar, Forging ASTM B124
Bronze 630 Bolts ASTM F468
Bronze 630 Forgins, Die AMS 4640, ASTM B283, MILITARY MIL-B-16166
Bronze 630 Nuts ASTM F467
Bronze 630 Plate ASTM B171, FEDERAL QQ-C-450
Bronze 630 Plate, Condenser Tube ASME SB171, ASTM B171
Bronze 630 Rod AMS 4640, ASME SB150, ASTM B150, SAE J463, J461
Bronze 630 Rod, Forging ASTM B124
Bronze 630 Screws ASTM F468
Bronze 630 Shapes AMS 4640, ASTM B150, SAE J463, J461
Bronze 630 Shapes, Forging ASTM B124
Bronze 630 Sheet FEDERAL QQ-C-450

Bronze 630 Uses

Bronze 630 is an alloy composed of copper, manganese and zinc with various uses. It has good corrosion resistance, so that it can be utilized in many construction projects, often as an alternative to stainless steel. Bronze 630 is also becoming more popular in the production of sculptures and artworks due to its resistance to the elements and ease of working with the material. Furthermore, thanks to its impressive electrical conductivity capabilities, it can be used for electrical connectors and contacts. Finally, owing to its superior strength characteristics at both high and low temperatures, it is a great fit for power industries such as nuclear plants because it can withstand extreme heat without breaking down or corroding.


One of the most popular uses for bronze is in jewellery. Bronze is a metal that can be easily shaped and molded, which makes it ideal for creating intricate designs. Also, bronze is a relatively affordable metal, making it a popular choice for costume jewellery.


Bronze is also commonly used for sculptures. The metal is durable and weather-resistant, which makes it ideal for outdoor sculptures. Additionally, bronze can be polished to a high shine, which gives sculptures made from the metal a beautiful lustre.


Bronze has also been used for coins throughout history. The metal is abundant and easy to work with, which made it an ideal choice for early coinage. Also, bronze coins are more durable than those made from other metals, such as silver or gold.


Bronze has also been used for weapons since ancient times. The metal is strong and hard, which makes it ideal for creating knives, swords, and other edged weapons. Also, bronze is less likely to rust than other metals, making it a good choice for weapons exposed to the elements.


Bronze has also been used to create tools since ancient times. The metal is hard and durable, making it ideal for creating hammers, axes, and other devices with heavy use. Also, bronze is less likely to rust than other metals, making it a good choice for tools exposed to the elements.

Musical Instruments

Bronze is also popular for musical instruments due to its acoustic properties. The metal produces a clear tone that carries well, making it ideal for instruments such as cymbals and bells. Additionally, bronze is relatively easy to shape and mold, which allows instrument makers to create intricate designs.


Bronze is also commonly used in bearings due to its durability and low friction properties. Bearings are devices that allow two objects to move smoothly past each other without excessive wear or binding. Bronze bearings are typically used in applications with high loads or speeds, such as in car engines or industrial machinery.


Since bronze 630 has such low melting points (850 – 890C or 1562 – 1634F), it is easy to weld with most welding techniques like oxyacetylene welding or TIG welding using a suitable filler rod. However, due to its high zinc content, precautions must be taken when welding to prevent zinc fumes from forming during the process.

Corrosion Resistance

Bronze 630, otherwise known as Naval Brass, is widely used in the marine and construction industries due to its excellent corrosion resistance. This alloy can withstand harsh weather conditions without succumbing to the elements, which makes it ideal for these settings. In addition to its extreme corrosion resistance, it also has a low fabrication cost and quick machining capabilities, making it easy to incorporate into diverse projects. As an all-purpose material, the Bronze 630 is an invaluable asset that provides durability and ease of use, making it perfect for various uses.

Heat Treatment

Heating metal to a specific temperature and allowing it to cool in order to achieve desired properties is known as heat treatment. One of the most commonly used processes is bronze 630 heat treatment, which involves heating bronze to a temperature of 630°C followed by water quenching. This results in the bronze getting harder than its original state, making it ideal for applications with higher strength and durability. The preventive maintenance offered by this process also helps prevent rusting or corrosion. It is important to note that over-quenching the metal can lead to stress fractures, so careful control of time and temperature is essential during this process.

Heat Resistance

Bronze 630 is known for its durable characteristics, and heat resistance is one of the most prominent features. Its ability to withstand extreme temperatures makes it an ideal material for heavy-duty applications, such as mining machinery and components for industrial heating equipment. Its low coefficient of thermal expansion also allows for secure connections that remain functional and reliable even in a wide range of temperatures. This remarkable attribute has ensured bronze 630 remains a leading choice among many manufacturers who need the highest quality reliable metals for specialized products, thus making it one of the top materials utilized in today’s market.


Bronze 630 machining is an art that requires expert precision and expertise. It is the process of cutting, shaping and milling metal into a desired shape or form. The method of machining bronze 630 involves cutting components from sheet metal with high accuracy and repeatability. With careful preparation and skilful cutting, the intricate details of parts produced through bronze 630 machining can have stunning visual appeal to both the eye and the mind. In addition, due to its rust-resistant properties, bronze 630 is widely used in applications with extreme environmental or operating conditions, such as marine parts on offshore rigs. As such, precise and precise machining of this durable material is essential for creating high-quality and reliable products.


630 Bronze is an incredibly versatile metal alloy that has been used for centuries to make many different objects from sculptures to door handles to machine parts and more! Its strong yet lightweight composition allows for great strength while still being malleable enough for machining and welding processes. Thanks to its corrosion resistance properties, it’s perfect for use outdoors or in corrosive environments making it a great choice for your next project! Whether you’re creating something functional or decorative out of bronze 630, you can rest assured that your finished product will last years!

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