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AISI 302 Stainless Steel vs. AZ91A Magnesium

AISI 302 stainless steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 302 stainless steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 440
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 4.5 to 46
5.0
Fatigue Strength, MPa 210 to 520
99
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 400 to 830
140
Tensile Strength: Ultimate (UTS), MPa 580 to 1430
240
Tensile Strength: Yield (Proof), MPa 230 to 1100
160

Thermal Properties

Latent Heat of Fusion, J/g 280
360
Maximum Temperature: Mechanical, °C 710
130
Melting Completion (Liquidus), °C 1420
600
Melting Onset (Solidus), °C 1400
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 16
73
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
10
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
52

Otherwise Unclassified Properties

Base Metal Price, % relative 15
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.0
22
Embodied Energy, MJ/kg 42
160
Embodied Water, L/kg 140
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59 to 260
11
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 3070
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 21 to 51
38
Strength to Weight: Bending, points 20 to 36
49
Thermal Diffusivity, mm2/s 4.4
42
Thermal Shock Resistance, points 12 to 31
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 17 to 19
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 67.9 to 75
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 0 to 2.0
0.13 to 0.5
Nickel (Ni), % 8.0 to 10
0 to 0.030
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0.35 to 1.0