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Full-Hard (H04) C68800 Brass

H04 C68800 brass is C68800 brass in the H04 (full hard) temper. The graph bars on the material properties cards below compare H04 C68800 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

6.0 %

Poisson's Ratio

0.32

Rockwell B Hardness

96

Rockwell Superficial 30T Hardness

82

Shear Modulus

41 GPa 5.9 x 106 psi

Shear Strength

440 MPa 64 x 103 psi

Tensile Strength: Ultimate (UTS)

750 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

670 MPa 97 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

960 °C 1770 °F

Melting Onset (Solidus)

950 °C 1740 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

18 % IACS

Electrical Conductivity: Equal Weight (Specific)

20 % IACS

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

350 L/kg 42 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

43 MJ/m3

Resilience: Unit (Modulus of Resilience)

2070 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

26 points

Alloy Composition

Copper (Cu)Cu 70.8 to 75.5
Zinc (Zn)Zn 21.3 to 24.1
Aluminum (Al)Al 3.0 to 3.8
Cobalt (Co)Co 0.25 to 0.55
Iron (Fe)Fe 0 to 0.2
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.5

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

Followup Questions

Further Reading

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