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AISI 422 Stainless Steel vs. EQ21A Magnesium

AISI 422 stainless steel belongs to the iron alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (8, 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 422 stainless steel and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260 to 330
80
Elastic (Young's, Tensile) Modulus, GPa 200
44
Elongation at Break, % 15 to 17
2.4
Fatigue Strength, MPa 410 to 500
110
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
17
Shear Strength, MPa 560 to 660
150
Tensile Strength: Ultimate (UTS), MPa 910 to 1080
250
Tensile Strength: Yield (Proof), MPa 670 to 870
190

Thermal Properties

Latent Heat of Fusion, J/g 270
340
Maximum Temperature: Mechanical, °C 650
160
Melting Completion (Liquidus), °C 1480
640
Melting Onset (Solidus), °C 1470
560
Specific Heat Capacity, J/kg-K 470
980
Thermal Conductivity, W/m-K 24
110
Thermal Expansion, µm/m-K 10
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.7
25
Electrical Conductivity: Equal Weight (Specific), % IACS 5.3
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
80
Density, g/cm3 7.9
1.9
Embodied Carbon, kg CO2/kg material 3.1
27
Embodied Energy, MJ/kg 44
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 150
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1910
410
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
63
Strength to Weight: Axial, points 32 to 38
37
Strength to Weight: Bending, points 26 to 30
47
Thermal Diffusivity, mm2/s 6.4
62
Thermal Shock Resistance, points 33 to 39
15

Alloy Composition

Carbon (C), % 0.2 to 0.25
0
Chromium (Cr), % 11 to 12.5
0
Copper (Cu), % 0
0.050 to 0.1
Iron (Fe), % 81.9 to 85.8
0
Magnesium (Mg), % 0
93.9 to 96.8
Manganese (Mn), % 0.5 to 1.0
0
Molybdenum (Mo), % 0.9 to 1.3
0
Nickel (Ni), % 0.5 to 1.0
0 to 0.010
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
1.3 to 1.7
Sulfur (S), % 0 to 0.025
0
Tungsten (W), % 0.9 to 1.3
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Vanadium (V), % 0.2 to 0.3
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3