ThePipingMart Blog Grades Phosphorus Bronze PB104 – Composition, Properties, and Properties

Phosphorus Bronze PB104 – Composition, Properties, and Properties

Bronze PB104

Bronze PB104 is a type of phosphor bronze that has become popular. It is an alloy of copper, tin, phosphorous, and other materials. PB104 has many amazing properties, ranging from high wear resistance to great strength. This blog post will provide an in-depth look at the composition, physical and mechanical properties, uses, hardness, and heat treatment of bronze PB104.

Bronze PB104 Composition

The composition of PB104 is as follows; Copper 93%, Tin 5%, and Phosphorus 2 %. These materials are carefully combined in the right proportions, resulting in a robust and durable alloy. The tin content provides hardness and strength, while the phosphorous content helps to improve wear resistance.

Chemical Composition Limits
Weight % Sn Ni Fe Pb Cu P Zn
PB 104 7.5 / 9.0 0.3 max 0.1 max 0.05 max remainder 0.02 / 0.4 0.3 max

Bronze PB104 Physical Properties

Bronze PB104 has unique physical properties, such as high resistance to corrosion, pitting, and oxidation. Its bright golden colour makes it aesthetically pleasing and it has excellent electrical conductivity, making it useful in electrical applications. PB104 has excellent thermal conductivity, meaning heat is evenly distributed throughout the material.

Density g/cm³ 8.8
Melting Temperature Range °C 880-1020
Thermal Conductivity W/mK 67
Electrical Resistivity μΩ.m15°C 15
Coefficient of Thermal Expansion 0-250°C 18
Relative Magnetic Permeability < 1.01

Bronze PB104 Mechanical Properties

PB104 is a hard and tough material with a high tensile strength of up to 800Mpa. It also has excellent fatigue strength, making it ideal for applications undergoing continuous and repetitive loads. This alloy is machineable and weldable, making it suitable for manufacturing gears, bushings, and valve components.

Material 0.2% Proof Stress (N/mm²) Tensile Strength (N/mm²) Elongation in 5.65√Cross Sectional Area(%)
PB 104 400 min 550 min 15 min

Bronze PB104 Uses

Bronze PB104 is used in several industries. It is commonly used for manufacturing electrical components, such as switches, connectors, and sockets. PB104 is also used in the aerospace industry to manufacture aircraft engine valve components due to its impressive strength and wear-resistant properties. Additionally, PB104 is used in the automotive and marine industries to manufacture gears, bearings, and bushings.

Bronze PB104 Hardness

Bronze PB104 has an exceptional hardness, thanks to the presence of tin in its composition. This alloy has a Rockwell hardness of around 75 RB, making it difficult to scratch or deform. PB104’s impressive hardness makes it suitable for wear-resistant applications that require a hard and durable surface.

Bronze PB104 Heat Treatment

Bronze PB104 is heat-treatable, which means it can undergo different heat treatment processes to improve its properties. One of the most common heat treatment processes is annealing, which involves heating the material to a specific temperature and cooling it slowly. This process helps to improve the material’s flexibility and softness, making it easier to work with.


Bronze PB104 is an excellent alloy that has many impressive properties. Its high resistance to wear and tear and its strength and durability make it an ideal material for several applications. Its excellent electrical conductivity also makes it suitable for electrical and electronic components. As we have seen in this blog post, the chemical composition, physical properties, mechanical properties, uses, hardness, and heat treatment processes of bronze PB104 make it an alloy highly sought after in many industries.

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