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AZ91B Magnesium vs. AISI 304N Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while AISI 304N 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 AISI 304N stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
190 to 360
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
9.1 to 45
Fatigue Strength, MPa 79
220 to 440
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
420 to 700
Tensile Strength: Ultimate (UTS), MPa 240
620 to 1180
Tensile Strength: Yield (Proof), MPa 160
270 to 850

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
960
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
16
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
43
Embodied Water, L/kg 990
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
98 to 280
Resilience: Unit (Modulus of Resilience), kJ/m3 280
180 to 1830
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
22 to 42
Strength to Weight: Bending, points 49
21 to 32
Thermal Diffusivity, mm2/s 42
4.2
Thermal Shock Resistance, points 14
14 to 26

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
18 to 20
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
66.4 to 73.9
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 10.5
Nitrogen (N), % 0
0.1 to 0.16
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0