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AZ91D Magnesium vs. S44725 Stainless Steel

AZ91D magnesium belongs to the magnesium alloys classification, while S44725 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 AZ91D magnesium and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
180
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 2.3 to 4.5
22
Fatigue Strength, MPa 74 to 85
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
81
Shear Strength, MPa 120 to 140
320
Tensile Strength: Ultimate (UTS), MPa 160 to 220
500
Tensile Strength: Yield (Proof), MPa 80 to 130
310

Thermal Properties

Latent Heat of Fusion, J/g 350
290
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 490
1410
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 78
17
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
3.1
Embodied Energy, MJ/kg 160
44
Embodied Water, L/kg 990
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
99
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
240
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 26 to 34
18
Strength to Weight: Bending, points 38 to 46
18
Thermal Diffusivity, mm2/s 45
4.6
Thermal Shock Resistance, points 9.5 to 13
16

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.015
Chromium (Cr), % 0
25 to 28.5
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
67.6 to 73.5
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0 to 0.4
Molybdenum (Mo), % 0
1.5 to 2.5
Nickel (Ni), % 0 to 0.0020
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 0.040
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Zinc (Zn), % 0.35 to 1.0
0