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AZ91A Magnesium vs. S21800 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while S21800 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (10, 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
40
Fatigue Strength, MPa 99
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
75
Shear Strength, MPa 140
510
Tensile Strength: Ultimate (UTS), MPa 240
740
Tensile Strength: Yield (Proof), MPa 160
390

Thermal Properties

Latent Heat of Fusion, J/g 360
340
Maximum Temperature: Mechanical, °C 130
900
Melting Completion (Liquidus), °C 600
1360
Melting Onset (Solidus), °C 470
1310
Specific Heat Capacity, J/kg-K 990
500
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.7
7.5
Embodied Carbon, kg CO2/kg material 22
3.1
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
250
Resilience: Unit (Modulus of Resilience), kJ/m3 280
390
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
26
Strength to Weight: Axial, points 38
27
Strength to Weight: Bending, points 49
24
Thermal Shock Resistance, points 14
17

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
16 to 18
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
59.1 to 65.4
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
7.0 to 9.0
Nickel (Ni), % 0 to 0.030
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.5
3.5 to 4.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0