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AZ91A Magnesium vs. EN 1.4474 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while EN 1.4474 stainless steel belongs to the iron alloys. There are 29 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 AZ91A magnesium and the bottom bar is EN 1.4474 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
23
Fatigue Strength, MPa 99
320
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
80
Tensile Strength: Ultimate (UTS), MPa 240
670
Tensile Strength: Yield (Proof), MPa 160
480

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
17
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
17
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
3.4
Embodied Energy, MJ/kg 160
48
Embodied Water, L/kg 990
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
140
Resilience: Unit (Modulus of Resilience), kJ/m3 280
560
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
24
Strength to Weight: Bending, points 49
22
Thermal Diffusivity, mm2/s 42
4.6
Thermal Shock Resistance, points 14
18

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
25 to 27
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
61.2 to 69.1
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Molybdenum (Mo), % 0
1.3 to 2.0
Nickel (Ni), % 0 to 0.030
4.5 to 6.5
Nitrogen (N), % 0
0.12 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0.35 to 1.0
0