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AISI 446 Stainless Steel vs. AZ91A Magnesium

AISI 446 stainless steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (7, 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 446 stainless steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 23
5.0
Fatigue Strength, MPa 200
99
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
18
Shear Strength, MPa 360
140
Tensile Strength: Ultimate (UTS), MPa 570
240
Tensile Strength: Yield (Proof), MPa 300
160

Thermal Properties

Latent Heat of Fusion, J/g 290
360
Maximum Temperature: Mechanical, °C 1180
130
Melting Completion (Liquidus), °C 1510
600
Melting Onset (Solidus), °C 1430
470
Specific Heat Capacity, J/kg-K 490
990
Thermal Conductivity, W/m-K 17
73
Thermal Expansion, µm/m-K 11
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
10
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
52

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 2.4
22
Embodied Energy, MJ/kg 35
160
Embodied Water, L/kg 150
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
11
Resilience: Unit (Modulus of Resilience), kJ/m3 230
280
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
69
Strength to Weight: Axial, points 21
38
Strength to Weight: Bending, points 20
49
Thermal Diffusivity, mm2/s 4.6
42
Thermal Shock Resistance, points 19
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 23 to 27
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 69.2 to 77
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 1.5
0.13 to 0.5
Nickel (Ni), % 0 to 0.75
0 to 0.030
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0.35 to 1.0