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UNS C26000 (CW505L) Cartridge Brass

C26000 brass is a brass formulated for primary forming into wrought products. CW505L is the EN numeric designation for this material. C26000 is the UNS number. Additionally, the EN chemical designation is CuZn30. The British Standard (BS) designation is CZ106. And the common industry name is 70-30 Cartridge Brass. Older literature may refer to this material as ASTM Brass Type 2, but this is now discouraged.

The properties of C26000 brass include eleven 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 C26000 brass to: wrought brasses (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

2.5 to 66 %

Poisson's Ratio

0.31

Rockwell B Hardness

53 to 93

Rockwell Superficial 30T Hardness

52 to 78

Shear Modulus

41 GPa 5.9 x 106 psi

Shear Strength

230 to 390 MPa 33 to 57 x 103 psi

Tensile Strength: Ultimate (UTS)

320 to 680 MPa 46 to 99 x 103 psi

Tensile Strength: Yield (Proof)

110 to 570 MPa 15 to 82 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 280 °F

Melting Completion (Liquidus)

950 °C 1750 °F

Melting Onset (Solidus)

920 °C 1680 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

120 W/m-K 70 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

28 % IACS

Electrical Conductivity: Equal Weight (Specific)

31 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

6.1 to 420 MJ/m3

Resilience: Unit (Modulus of Resilience)

51 to 1490 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

11 to 23 points

Strength to Weight: Bending

13 to 21 points

Thermal Diffusivity

38 mm2/s

Thermal Shock Resistance

11 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C26000 brass is notable for including bismuth (Bi). Bismuth improves machinability. It is used a non-toxic but more expensive replacement for lead.

Copper (Cu) 68.5 to 71.5
Zinc (Zn) 28.1 to 31.5
Lead (Pb) 0 to 0.070
Iron (Fe) 0 to 0.050
Bismuth (Bi) 0 to 0.0059
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

ASTM B19: Standard Specification for Cartridge Brass Sheet, Strip, Plate, Bar, and Disks

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