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ASTM A372 Grade M Steel vs. EV31A Magnesium

ASTM A372 grade M 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 (9, 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 A372 grade M steel and the bottom bar is EV31A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
70
Elastic (Young's, Tensile) Modulus, GPa 190
44
Elongation at Break, % 18 to 21
3.5
Fatigue Strength, MPa 450 to 520
120
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
17
Shear Strength, MPa 510 to 570
170
Tensile Strength: Ultimate (UTS), MPa 810 to 910
260
Tensile Strength: Yield (Proof), MPa 660 to 770
170

Thermal Properties

Maximum Temperature: Mechanical, °C 450
200
Melting Onset (Solidus), °C 1420
590
Specific Heat Capacity, J/kg-K 470
1000
Thermal Conductivity, W/m-K 46
86
Thermal Expansion, µm/m-K 13
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
18
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
90

Otherwise Unclassified Properties

Density, g/cm3 7.9
1.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
8.1
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
330
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
65
Strength to Weight: Axial, points 29 to 32
40
Strength to Weight: Bending, points 24 to 27
50
Thermal Diffusivity, mm2/s 12
47
Thermal Shock Resistance, points 24 to 27
16