BRONZE ALLOYS


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bronze alloys
bronze alloys
bronze alloys

Strictly speaking, bronze is an alloy of copper and tin. However, bronze is also used to describe a wider range of copper based alloys. Generally, bronze alloys consist of about 12% tin, though some specialised products may contains much as 20%. Phosphor bronzes, which contain less than 8% tin, have an addition of phosphor to improve strength and hardness. Superior attributes can often be attained through the addition of other elements to the basic bronze alloy. As well as phosphor, zinc and lead are the most common additions.

A leaded bronze will generally have better machining characteristics than an unleaded bronze. It will, however, retain a plasticity that makes it ideal for applications such as the production of bearings, as it allows slacker tolerances to be absorbed if softer shaft materials are used. This also prevents the overheating and seizure of like metals caused by friction.

Adding zinc to bronze alloys results in an alloy commonly known as “gunmetal”. This derives from the use of this product in early culverins etc., used because of its hardness and strength. It also has good resistance to corrosion and finds many applications in the marine industry. Added lead improves the machinability of this product.

Aluminium bronze has become well established in the manufacture of avionic equipment as well as use in naval and military applications due to its enhanced corrosion resistance.

Nearest Equivalent Specification

Available Products

A high strength nickel aluminium bronze that has good mechanical properties at high temperatures as well as excellent corrosion resistance. It is well suited to machining and hot stamping.

BS
EN
AMS

CA104 (B23)
CW307G
4640

NES833

Precipitation hardening stainless steel bar. American aerospace grade, vacuum arc remelted (type XM-13). Very high strength/toughness with good corrosion resistance. For aircraft structural components and use in petrochemical industry.

DEF STAN
UNS

02-833
C63000

SAE660

A popular, continually cast, leaded gunmetal not covered by BS EN 1982. It finds use in many applications where a balance of corrosion resistance, strength, hardness and machinability is required.

C932
UNS


C93200

PB1C

A standard, continually cast phosphor bronze alloy with an increased tin content giving it excellent wear resistance. It finds applications as a material for many kinds of bearings and bushes particularly where heavy loads are envisaged.

EN
ISO

CC481K
CuSn11P-C

LB4C

A bronze alloy that has an increased lead content that makes it more plastic than other alloys. General purpose bearings made from this material will withstand slacker tolerances and infrequent lubrication if a softer shaft material is used.

EN
ISO
UNS

CC494K
CuSn5Pb9
C93500

PB102

A common wrought phosphor bronze that finds a wide variety of engineering and architectural applications. It is very resistant to wear due to its hardness which is combined with high strength and good resistance to corrosion.

EN
ISO
UNS

CW451K
CuSn5
C51000