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ASTM A203 Steel vs. EV31A Magnesium

ASTM A203 steel belongs to the iron alloys classification, while EV31A magnesium belongs to the magnesium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, 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 A203 steel and the bottom bar is EV31A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
70
Elastic (Young's, Tensile) Modulus, GPa 190
44
Elongation at Break, % 22 to 26
3.5
Fatigue Strength, MPa 210 to 280
120
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
17
Shear Strength, MPa 330 to 370
170
Tensile Strength: Ultimate (UTS), MPa 520 to 590
260
Tensile Strength: Yield (Proof), MPa 290 to 390
170

Thermal Properties

Maximum Temperature: Mechanical, °C 410
200
Melting Onset (Solidus), °C 1420
590
Specific Heat Capacity, J/kg-K 470
1000
Thermal Conductivity, W/m-K 52
86
Thermal Expansion, µm/m-K 13
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
18
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5 to 8.7
90

Otherwise Unclassified Properties

Density, g/cm3 7.9
1.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
8.1
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 410
330
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
65
Strength to Weight: Axial, points 18 to 21
40
Strength to Weight: Bending, points 18 to 20
50
Thermal Diffusivity, mm2/s 14
47
Thermal Shock Resistance, points 15 to 17
16