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AZ91B Magnesium vs. AISI 201LN Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while AISI 201LN 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 201LN stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210 to 320
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
25 to 51
Fatigue Strength, MPa 79
340 to 540
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
530 to 680
Tensile Strength: Ultimate (UTS), MPa 240
740 to 1060
Tensile Strength: Yield (Proof), MPa 160
350 to 770

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Maximum Temperature: Mechanical, °C 130
880
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 470
1370
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.6
Embodied Energy, MJ/kg 160
38
Embodied Water, L/kg 990
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
230 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 280
310 to 1520
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
27 to 38
Strength to Weight: Bending, points 49
24 to 30
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 14
16 to 23

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
16 to 17.5
Copper (Cu), % 0 to 0.35
0 to 1.0
Iron (Fe), % 0
67.9 to 73.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
6.4 to 7.5
Nickel (Ni), % 0 to 0.030
4.0 to 5.0
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0