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AISI 205 Stainless Steel vs. AZ91D Magnesium

AISI 205 stainless steel belongs to the iron alloys classification, while AZ91D magnesium belongs to the magnesium alloys. There are 27 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 AISI 205 stainless steel and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 440
60 to 80
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 11 to 51
2.3 to 4.5
Fatigue Strength, MPa 410 to 640
74 to 85
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 560 to 850
120 to 140
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
160 to 220
Tensile Strength: Yield (Proof), MPa 450 to 1100
80 to 130

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Maximum Temperature: Mechanical, °C 880
130
Melting Completion (Liquidus), °C 1380
600
Melting Onset (Solidus), °C 1340
490
Specific Heat Capacity, J/kg-K 480
990
Thermal Expansion, µm/m-K 18
27

Otherwise Unclassified Properties

Base Metal Price, % relative 11
12
Density, g/cm3 7.6
1.7
Embodied Carbon, kg CO2/kg material 2.6
22
Embodied Energy, MJ/kg 37
160
Embodied Water, L/kg 150
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 430
4.2 to 7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 3060
69 to 170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 26
69
Strength to Weight: Axial, points 29 to 52
26 to 34
Strength to Weight: Bending, points 25 to 37
38 to 46
Thermal Shock Resistance, points 16 to 29
9.5 to 13

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0.12 to 0.25
0
Chromium (Cr), % 16.5 to 18.5
0
Copper (Cu), % 0
0 to 0.030
Iron (Fe), % 62.6 to 68.1
0 to 0.0050
Magnesium (Mg), % 0
88.7 to 91.2
Manganese (Mn), % 14 to 15.5
0.15 to 0.5
Nickel (Ni), % 1.0 to 1.7
0 to 0.0020
Nitrogen (N), % 0.32 to 0.4
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0.35 to 1.0