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AZ91B Magnesium vs. AISI 204 Stainless Steel

AZ91B magnesium belongs to the magnesium alloys classification, while AISI 204 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 204 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210 to 330
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
23 to 39
Fatigue Strength, MPa 79
320 to 720
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
500 to 700
Tensile Strength: Ultimate (UTS), MPa 240
730 to 1100
Tensile Strength: Yield (Proof), MPa 160
380 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Maximum Temperature: Mechanical, °C 130
850
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
10
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.4
Embodied Energy, MJ/kg 160
35
Embodied Water, L/kg 990
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
240 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 280
360 to 2940
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
27 to 40
Strength to Weight: Bending, points 49
24 to 31
Thermal Diffusivity, mm2/s 42
4.1
Thermal Shock Resistance, points 14
16 to 24

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
69.6 to 76.4
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
7.0 to 9.0
Nickel (Ni), % 0 to 0.030
1.5 to 3.0
Nitrogen (N), % 0
0.15 to 0.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0