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AZ91B Magnesium vs. EN 1.4305 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.4305 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 1.4305 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
200 to 270
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
14 to 40
Fatigue Strength, MPa 79
190 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
420 to 550
Tensile Strength: Ultimate (UTS), MPa 240
610 to 900
Tensile Strength: Yield (Proof), MPa 160
220 to 570

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
930
Melting Completion (Liquidus), °C 600
1420
Melting Onset (Solidus), °C 470
1380
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
3.0
Embodied Energy, MJ/kg 160
42
Embodied Water, L/kg 990
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
110 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 280
120 to 830
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
22 to 32
Strength to Weight: Bending, points 49
20 to 27
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 14
14 to 20

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 0 to 0.35
0 to 1.0
Iron (Fe), % 0
66.4 to 74.9
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Nickel (Ni), % 0 to 0.030
8.0 to 10
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35
Zinc (Zn), % 0.35 to 1.0
0