What Is Bronze Made From?

Properties Of Bronze

Let's look at the question "what is bronze made from." Bronze is much less brittle than iron, and when it oxidizes the oxidisation is only superficial. This is due to the copper carbonate layer protecting the underlying layer from corroding further.

These copper based alloys (bronze) melt at a lower temperature to steel or iron and are more easily produced from their constituent metals. They are generally about 10% heavier than steel, however alloys that use silicon or aluminum will be considerably less dense.

Bronzes are weaker and softer than steel. If you look at bronze springs for instance, they are less stiff and therefore store less energy even when of the same bulk. It resists corrosion and metal fatigue more effectively than steel and of course it is a better conductor of heat and electricity.

The copper alloys of which bronze is one, have a huge variety of applications due to their physical, chemical and mechanical properties. Some of these excellent properties of these alloys are the excellent deep drawing qualities of cartridge case brass and the excellent electrical conductivity of copper.

Then there is the ow friction properties of bearing bronze and the beautiful resonating qualities of bell bronze.

The actual melting point of bronze varies due to the ratio of the alloying elements, but generally happens at around 950C

General Purpose Bushing Bronze / LG2

Bearing Bronze
As the name implies, this is the most commonly used bronze in bushing and bearing applications. It is comparably easy to machine, and provides long life in applications where wear is a consideration.

Bearing Bronze
Min. Properties Yield Strength 20,000 psi
Maximum Tensile Strength 35,000 psi
Elongation in 2" 10%
Brinell Hardness 65 - 75
Chemistry Zinc2.0 - 4.0%
Tin (Sn) 6.3 - 7.5%
Lead 6.0 - 8.0%
Copper (Cu) 81.0 - 85.0%

Typical Uses

Used in hydraulic fittings that need to be pressure tight. Other common uses for LG 2 are cocks, taps, pipes and elbows.

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