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AISI 204 Stainless Steel vs. AZ91B Magnesium

AISI 204 stainless steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium 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 AISI 204 stainless steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 280
360
Maximum Temperature: Mechanical, °C 850
130
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1370
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 15
73
Thermal Expansion, µm/m-K 17
26

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 2.4
22
Embodied Energy, MJ/kg 35
160
Embodied Water, L/kg 130
990

Common Calculations

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

Alloy Composition

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