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AZ91A Magnesium vs. AISI 304L Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while AISI 304L stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91A magnesium and the bottom bar is AISI 304L stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
160 to 350
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
6.7 to 46
Fatigue Strength, MPa 99
170 to 430
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
370 to 680
Tensile Strength: Ultimate (UTS), MPa 240
540 to 1160
Tensile Strength: Yield (Proof), MPa 160
190 to 870

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
540
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1400
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
16
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
16
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
3.1
Embodied Energy, MJ/kg 160
44
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
71 to 240
Resilience: Unit (Modulus of Resilience), kJ/m3 280
92 to 1900
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
19 to 41
Strength to Weight: Bending, points 49
19 to 31
Thermal Diffusivity, mm2/s 42
4.2
Thermal Shock Resistance, points 14
12 to 25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
18 to 20
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
65 to 74
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Nickel (Ni), % 0 to 0.030
8.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0