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AISI 317 Stainless Steel vs. EQ21A Magnesium

AISI 317 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 (6, 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 317 stainless steel and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 220
80
Elastic (Young's, Tensile) Modulus, GPa 200
44
Elongation at Break, % 35 to 55
2.4
Fatigue Strength, MPa 250 to 330
110
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
17
Shear Strength, MPa 420 to 470
150
Tensile Strength: Ultimate (UTS), MPa 580 to 710
250
Tensile Strength: Yield (Proof), MPa 250 to 420
190

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Mechanical, °C 590
160
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1380
560
Specific Heat Capacity, J/kg-K 470
980
Thermal Conductivity, W/m-K 15
110
Thermal Expansion, µm/m-K 17
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
25
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
120

Otherwise Unclassified Properties

Base Metal Price, % relative 21
80
Density, g/cm3 7.9
1.9
Embodied Carbon, kg CO2/kg material 4.3
27
Embodied Energy, MJ/kg 59
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 260
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
410
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
63
Strength to Weight: Axial, points 20 to 25
37
Strength to Weight: Bending, points 20 to 22
47
Thermal Diffusivity, mm2/s 4.1
62
Thermal Shock Resistance, points 12 to 15
15

Alloy Composition

Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 0
0.050 to 0.1
Iron (Fe), % 58 to 68
0
Magnesium (Mg), % 0
93.9 to 96.8
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 11 to 15
0 to 0.010
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0
Silver (Ag), % 0
1.3 to 1.7
Sulfur (S), % 0 to 0.030
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3