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Zinc-Lead-Cadmium Rolled Zinc Alloy (Z21721)

Z21721 zinc is an otherwise-unclassified alloy of zinc. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately low heat capacity and a moderately low tensile strength among zinc alloys. The graph bars on the material properties cards below compare Z21721 zinc to other zinc alloys (top) 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

87 GPa 13 x 106 psi

Elongation at Break

40 %

Poisson's Ratio

0.25

Shear Modulus

35 GPa 5.0 x 106 psi

Tensile Strength: Ultimate (UTS)

150 MPa 22 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

110 J/g

Maximum Temperature: Mechanical

90 °C 190 °F

Melting Completion (Liquidus)

410 °C 770 °F

Melting Onset (Solidus)

390 °C 740 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

110 W/m-K 65 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

37 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

6.6 g/cm3 410 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

53 MJ/kg 23 x 103 BTU/lb

Embodied Water

340 L/kg 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

57 MJ/m3

Resilience: Unit (Modulus of Resilience)

88 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

6.4 points

Strength to Weight: Bending

9.6 points

Thermal Diffusivity

44 m2/s

Thermal Shock Resistance

4.8 points

Alloy Composition

Zinc (Zn) 98.9 to 100
Lead (Pb) 0 to 1.0
Cadmium (Cd) 0 to 0.070
Titanium (Ti) 0 to 0.020
Iron (Fe) 0 to 0.010
Copper (Cu) 0 to 0.0050
Aluminum (Al) 0 to 0.0020

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

Followup Questions

Similar Alloys

Further Reading

ASTM B69: Standard Specification for Rolled Zinc

Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994

Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015