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ASTM A387 Grade 21 Steel vs. Zamak 3

ASTM A387 grade 21 steel belongs to the iron alloys classification, while Zamak 3 belongs to the zinc alloys. There are 31 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is Zamak 3.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
83
Elastic (Young's, Tensile) Modulus, GPa 190
86
Elongation at Break, % 21
11
Fatigue Strength, MPa 160 to 250
48
Poisson's Ratio 0.29
0.25
Shear Modulus, GPa 74
33
Shear Strength, MPa 310 to 370
210
Tensile Strength: Ultimate (UTS), MPa 500 to 590
280
Tensile Strength: Yield (Proof), MPa 230 to 350
210

Thermal Properties

Latent Heat of Fusion, J/g 260
120
Maximum Temperature: Mechanical, °C 480
95
Melting Completion (Liquidus), °C 1470
390
Melting Onset (Solidus), °C 1430
380
Specific Heat Capacity, J/kg-K 470
410
Thermal Conductivity, W/m-K 41
110
Thermal Expansion, µm/m-K 13
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
27
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
38

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
11
Density, g/cm3 7.9
6.4
Embodied Carbon, kg CO2/kg material 1.8
3.0
Embodied Energy, MJ/kg 23
57
Embodied Water, L/kg 62
380

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
28
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
260
Stiffness to Weight: Axial, points 13
7.5
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 18 to 21
12
Strength to Weight: Bending, points 18 to 20
15
Thermal Diffusivity, mm2/s 11
43
Thermal Shock Resistance, points 14 to 17
8.6

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.3
Cadmium (Cd), % 0
0 to 0.0050
Carbon (C), % 0.050 to 0.15
0
Chromium (Cr), % 2.8 to 3.3
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
0 to 0.1
Lead (Pb), % 0
0 to 0.0050
Magnesium (Mg), % 0
0.020 to 0.060
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.030
Sulfur (S), % 0 to 0.025
0
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0
95.3 to 96.5