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ASTM A387 Grade 21 Steel vs. ZA-12

ASTM A387 grade 21 steel belongs to the iron alloys classification, while ZA-12 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 ZA-12.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
89 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
83
Elongation at Break, % 21
1.6 to 5.3
Fatigue Strength, MPa 160 to 250
73 to 120
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 74
33
Shear Strength, MPa 310 to 370
240 to 300
Tensile Strength: Ultimate (UTS), MPa 500 to 590
260 to 400
Tensile Strength: Yield (Proof), MPa 230 to 350
210 to 320

Thermal Properties

Latent Heat of Fusion, J/g 260
120
Maximum Temperature: Mechanical, °C 480
100
Melting Completion (Liquidus), °C 1470
430
Melting Onset (Solidus), °C 1430
380
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 41
120
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
28
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
42

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
11
Density, g/cm3 7.9
6.0
Embodied Carbon, kg CO2/kg material 1.8
3.4
Embodied Energy, MJ/kg 23
64
Embodied Water, L/kg 62
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
4.0 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
260 to 620
Stiffness to Weight: Axial, points 13
7.6
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
12 to 19
Strength to Weight: Bending, points 18 to 20
15 to 20
Thermal Diffusivity, mm2/s 11
43
Thermal Shock Resistance, points 14 to 17
9.4 to 14

Alloy Composition

Aluminum (Al), % 0
10.5 to 11.5
Cadmium (Cd), % 0
0 to 0.0060
Carbon (C), % 0.050 to 0.15
0
Chromium (Cr), % 2.8 to 3.3
0
Copper (Cu), % 0
0.5 to 1.2
Iron (Fe), % 94.4 to 96
0 to 0.075
Lead (Pb), % 0
0 to 0.0060
Magnesium (Mg), % 0
0.015 to 0.030
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 0.060
Sulfur (S), % 0 to 0.025
0
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0
87.1 to 89