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SAE-AISI 4320 Steel vs. Z21721 Zinc

SAE-AISI 4320 steel belongs to the iron alloys classification, while Z21721 zinc belongs to the zinc alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4320 steel and the bottom bar is Z21721 zinc.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
87
Elongation at Break, % 21 to 29
40
Poisson's Ratio 0.29
0.25
Shear Modulus, GPa 73
35
Tensile Strength: Ultimate (UTS), MPa 570 to 790
150
Tensile Strength: Yield (Proof), MPa 430 to 460
120

Thermal Properties

Latent Heat of Fusion, J/g 250
110
Maximum Temperature: Mechanical, °C 420
90
Melting Completion (Liquidus), °C 1460
410
Melting Onset (Solidus), °C 1420
390
Specific Heat Capacity, J/kg-K 470
390
Thermal Conductivity, W/m-K 46
110
Thermal Expansion, µm/m-K 11
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
27
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
37

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
11
Density, g/cm3 7.9
6.6
Embodied Carbon, kg CO2/kg material 1.7
2.8
Embodied Energy, MJ/kg 22
53
Embodied Water, L/kg 52
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 150
57
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 560
88
Stiffness to Weight: Axial, points 13
7.3
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 20 to 28
6.4
Strength to Weight: Bending, points 19 to 24
9.6
Thermal Diffusivity, mm2/s 13
44
Thermal Shock Resistance, points 19 to 27
4.8

Alloy Composition

Aluminum (Al), % 0
0 to 0.0020
Cadmium (Cd), % 0
0 to 0.070
Carbon (C), % 0.17 to 0.22
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
0 to 0.0050
Iron (Fe), % 95.8 to 97
0 to 0.010
Lead (Pb), % 0
0 to 1.0
Manganese (Mn), % 0.45 to 0.65
0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.020
Zinc (Zn), % 0
98.9 to 100