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Spring-Tempered (H08) C21000 Brass

H08 C21000 brass is C21000 brass in the H08 (spring) temper. It has the second highest strength and second lowest ductility compared to the other variants of C21000 brass. The graph bars on the material properties cards below compare H08 C21000 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 17 x 106 psi

Elongation at Break

4.0 %

Poisson's Ratio

0.34

Rockwell B Hardness

72

Rockwell Superficial 30T Hardness

67

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

280 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

440 MPa 64 x 103 psi

Tensile Strength: Yield (Proof)

400 MPa 58 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

1070 °C 1950 °F

Melting Onset (Solidus)

1050 °C 1920 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

230 W/m-K 140 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

56 % IACS

Electrical Conductivity: Equal Weight (Specific)

57 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

8.8 g/cm3 550 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)

17 MJ/m3

Resilience: Unit (Modulus of Resilience)

700 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

69 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Copper (Cu)Cu 94 to 96
Zinc (Zn)Zn 3.7 to 6.0
Iron (Fe)Fe 0 to 0.050
Lead (Pb)Pb 0 to 0.030
Residualsres. 0 to 0.2

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

Followup Questions

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