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ASTM Grade HP Steel vs. ZK51A Magnesium

ASTM grade HP steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 5.1
4.7
Fatigue Strength, MPa 130
62
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
18
Tensile Strength: Ultimate (UTS), MPa 490
240
Tensile Strength: Yield (Proof), MPa 260
150

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Maximum Temperature: Mechanical, °C 1100
120
Melting Completion (Liquidus), °C 1370
640
Melting Onset (Solidus), °C 1330
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 12
110
Thermal Expansion, µm/m-K 16
26

Otherwise Unclassified Properties

Base Metal Price, % relative 34
13
Density, g/cm3 7.9
1.8
Embodied Carbon, kg CO2/kg material 5.8
24
Embodied Energy, MJ/kg 82
160
Embodied Water, L/kg 220
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
10
Resilience: Unit (Modulus of Resilience), kJ/m3 170
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 17
36
Strength to Weight: Bending, points 17
47
Thermal Diffusivity, mm2/s 3.2
61
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0.35 to 0.75
0
Chromium (Cr), % 24 to 28
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 29.2 to 42.7
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 33 to 37
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.5
0
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3