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Zinc-Lead-Cadmium Rolled Zinc Alloy (Z21721)

Z21721 zinc is an otherwise-unclassified alloy of zinc. It is typically furnished in the as-fabricated (no temper or treatment) condition. It has a moderately low heat capacity and a moderately low tensile strength relative to other zinc alloys. The graph bars on the material properties cards below compare Z21721 zinc to other zinc alloys (top) and the entire database (bottom).

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

Thermal Properties

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 Expansion

26 µm/m-K

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

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 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

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

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