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UNS C22000 (CW501L) Commercial Bronze

C22000 bronze is a bronze formulated for primary forming into wrought products. CW501L is the EN numeric designation for this material. C22000 is the UNS number. Additionally, the EN chemical designation is CuZn10. The British Standard (BS) designation is CZ101. And the common industry name is 90-10 Commercial Bronze. Older literature may refer to this material as ASTM Bronze Type 7, but this is now discouraged.

It can have the lowest tensile strength among wrought bronzes. In addition, it has a moderately low embodied energy and a moderately high electrical conductivity.

The properties of C22000 bronze include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C22000 bronze to: wrought bronzes (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

1.9 to 45 %

Poisson's Ratio


Rockwell B Hardness

42 to 81

Rockwell Superficial 30T Hardness

47 to 73

Shear Modulus

42 GPa 6.2 x 106 psi

Shear Strength

200 to 300 MPa 28 to 43 x 103 psi

Tensile Strength: Ultimate (UTS)

260 to 520 MPa 37 to 76 x 103 psi

Tensile Strength: Yield (Proof)

69 to 500 MPa 10 to 73 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

1040 °C 1910 °F

Melting Onset (Solidus)

1020 °C 1870 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

190 W/m-K 110 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

44 % IACS

Electrical Conductivity: Equal Weight (Specific)

45 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative


8.7 g/cm3 540 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.7 to 230 MJ/m3

Resilience: Unit (Modulus of Resilience)

21 to 1110 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.1 to 17 points

Strength to Weight: Bending

10 to 17 points

Thermal Diffusivity

56 mm2/s

Thermal Shock Resistance

8.8 to 18 points

Alloy Composition

Among wrought copper alloys, the composition of C22000 bronze is notable for containing comparatively high amounts of iron (Fe) and lead (Pb). Iron is used to increase strength inexpensively. Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Copper (Cu)Cu 89 to 91
Zinc (Zn)Zn 8.7 to 11
Iron (Fe)Fe 0 to 0.050
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.2

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B134: Standard Specification for Brass Wire

ASTM B36: Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993