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ASTM A387 Grade 9 Steel vs. EN-MC21210 Magnesium

ASTM A387 grade 9 steel belongs to the iron alloys classification, while EN-MC21210 magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 A387 grade 9 steel and the bottom bar is EN-MC21210 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
48
Elastic (Young's, Tensile) Modulus, GPa 190
44
Elongation at Break, % 20 to 21
14
Fatigue Strength, MPa 160 to 240
70
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
17
Shear Strength, MPa 310 to 380
110
Tensile Strength: Ultimate (UTS), MPa 500 to 600
190
Tensile Strength: Yield (Proof), MPa 230 to 350
90

Thermal Properties

Latent Heat of Fusion, J/g 270
350
Maximum Temperature: Mechanical, °C 600
100
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
570
Specific Heat Capacity, J/kg-K 470
1000
Thermal Conductivity, W/m-K 26
120
Thermal Expansion, µm/m-K 13
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
24
Electrical Conductivity: Equal Weight (Specific), % IACS 10
130

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
12
Density, g/cm3 7.8
1.6
Embodied Carbon, kg CO2/kg material 2.1
24
Embodied Energy, MJ/kg 28
160
Embodied Water, L/kg 87
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
22
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
92
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
72
Strength to Weight: Axial, points 18 to 21
32
Strength to Weight: Bending, points 18 to 20
44
Thermal Diffusivity, mm2/s 6.9
76
Thermal Shock Resistance, points 14 to 17
11

Alloy Composition

Aluminum (Al), % 0
1.6 to 2.6
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 8.0 to 10
0
Copper (Cu), % 0
0 to 0.010
Iron (Fe), % 87.1 to 90.8
0 to 0.0050
Magnesium (Mg), % 0
96.3 to 98.3
Manganese (Mn), % 0.3 to 0.6
0.1 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
0 to 0.0020
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.025
0
Vanadium (V), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.010