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EV31A Magnesium vs. S40977 Stainless Steel

EV31A magnesium belongs to the magnesium alloys classification, while S40977 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (11, 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 EV31A magnesium and the bottom bar is S40977 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
160
Elastic (Young's, Tensile) Modulus, GPa 44
190
Elongation at Break, % 3.5
21
Fatigue Strength, MPa 120
200
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 17
76
Shear Strength, MPa 170
320
Tensile Strength: Ultimate (UTS), MPa 260
510
Tensile Strength: Yield (Proof), MPa 170
310

Thermal Properties

Maximum Temperature: Mechanical, °C 200
720
Melting Onset (Solidus), °C 590
1400
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 86
25
Thermal Expansion, µm/m-K 27
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 18
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 90
3.3

Otherwise Unclassified Properties

Density, g/cm3 1.8
7.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 8.1
92
Resilience: Unit (Modulus of Resilience), kJ/m3 330
250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 40
18
Strength to Weight: Bending, points 50
18
Thermal Diffusivity, mm2/s 47
6.7
Thermal Shock Resistance, points 16
18