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Spring-Tempered (H08) C68800 Brass

H08 C68800 brass is C68800 brass in the H08 (spring) temper. It has the second highest strength compared to the other variants of C68800 brass. The graph bars on the material properties cards below compare H08 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

2.0 %

Fatigue Strength

260 MPa 37 x 103 psi

Poisson's Ratio

0.32

Rockwell B Hardness

98

Rockwell Superficial 30T Hardness

83

Shear Modulus

41 GPa 5.9 x 106 psi

Shear Strength

480 MPa 70 x 103 psi

Tensile Strength: Ultimate (UTS)

840 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

760 MPa 110 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)

16 MJ/m3

Resilience: Unit (Modulus of Resilience)

2670 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

24 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

29 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