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AS41A Magnesium vs. ASTM A231 Spring Steel

AS41A magnesium belongs to the magnesium alloys classification, while ASTM A231 spring steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 AS41A magnesium and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 11
14
Fatigue Strength, MPa 100
1000
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Shear Strength, MPa 130
1080
Tensile Strength: Ultimate (UTS), MPa 230
1790
Tensile Strength: Yield (Proof), MPa 140
1570

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 110
420
Melting Completion (Liquidus), °C 620
1460
Melting Onset (Solidus), °C 570
1410
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 68
52
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 92
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.3
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 23
2.0
Embodied Energy, MJ/kg 160
28
Embodied Water, L/kg 980
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
230
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 38
64
Strength to Weight: Bending, points 50
42
Thermal Diffusivity, mm2/s 41
14
Thermal Shock Resistance, points 14
53

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0.48 to 0.53
Chromium (Cr), % 0
0.8 to 1.1
Copper (Cu), % 0 to 0.060
0
Iron (Fe), % 0
96.7 to 97.7
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
0.7 to 0.9
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3
Zinc (Zn), % 0 to 0.12
0