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AZ91B Magnesium vs. EN 1.4477 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.4477 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 AZ91B magnesium and the bottom bar is EN 1.4477 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
270
Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
22 to 23
Fatigue Strength, MPa 79
420 to 490
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
81
Shear Strength, MPa 140
550 to 580
Tensile Strength: Ultimate (UTS), MPa 240
880 to 930
Tensile Strength: Yield (Proof), MPa 160
620 to 730

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
1380
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
13
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
20
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
3.7
Embodied Energy, MJ/kg 160
52
Embodied Water, L/kg 990
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 280
940 to 1290
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
31 to 33
Strength to Weight: Bending, points 49
26 to 27
Thermal Diffusivity, mm2/s 42
3.5
Thermal Shock Resistance, points 14
23 to 25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
28 to 30
Copper (Cu), % 0 to 0.35
0 to 0.8
Iron (Fe), % 0
56.6 to 63.6
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.8 to 1.5
Molybdenum (Mo), % 0
1.5 to 2.6
Nickel (Ni), % 0 to 0.030
5.8 to 7.5
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0