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AZ91B Magnesium vs. EN 1.4874 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.4874 stainless steel belongs to the iron alloys. There are 28 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 AZ91B magnesium and the bottom bar is EN 1.4874 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
140
Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
6.7
Fatigue Strength, MPa 79
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
80
Tensile Strength: Ultimate (UTS), MPa 240
480
Tensile Strength: Yield (Proof), MPa 160
360

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Maximum Temperature: Mechanical, °C 130
1150
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1400
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 73
13
Thermal Expansion, µm/m-K 26
15

Otherwise Unclassified Properties

Base Metal Price, % relative 12
70
Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 22
7.6
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
29
Resilience: Unit (Modulus of Resilience), kJ/m3 280
310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
16
Strength to Weight: Bending, points 49
16
Thermal Diffusivity, mm2/s 42
3.3
Thermal Shock Resistance, points 14
11

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.35 to 0.65
Chromium (Cr), % 0
19 to 22
Cobalt (Co), % 0
18.5 to 22
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
23 to 38.9
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 0 to 0.030
18 to 22
Niobium (Nb), % 0
0.75 to 1.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0.35 to 1.0
0