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AISI 321 Stainless Steel vs. ISO-WD32260 Magnesium

AISI 321 stainless steel belongs to the iron alloys classification, while ISO-WD32260 magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 321 stainless steel and the bottom bar is ISO-WD32260 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 34 to 50
4.5 to 6.0
Fatigue Strength, MPa 220 to 270
150 to 190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 420 to 460
190 to 200
Tensile Strength: Ultimate (UTS), MPa 590 to 690
330 to 340
Tensile Strength: Yield (Proof), MPa 220 to 350
230 to 250

Thermal Properties

Latent Heat of Fusion, J/g 290
330
Maximum Temperature: Mechanical, °C 870
120
Melting Completion (Liquidus), °C 1430
600
Melting Onset (Solidus), °C 1400
520
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 16
110
Thermal Expansion, µm/m-K 17
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
140

Otherwise Unclassified Properties

Base Metal Price, % relative 16
13
Density, g/cm3 7.8
1.9
Embodied Carbon, kg CO2/kg material 3.2
23
Embodied Energy, MJ/kg 45
160
Embodied Water, L/kg 140
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
14 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
560 to 700
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
63
Strength to Weight: Axial, points 21 to 25
48 to 51
Strength to Weight: Bending, points 20 to 22
56 to 58
Thermal Diffusivity, mm2/s 4.1
63
Thermal Shock Resistance, points 13 to 15
19 to 20

Alloy Composition

Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 17 to 19
0
Iron (Fe), % 65.3 to 74
0
Magnesium (Mg), % 0
92.7 to 94.8
Manganese (Mn), % 0 to 2.0
0
Nickel (Ni), % 9.0 to 12
0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.7
0
Zinc (Zn), % 0
4.8 to 6.2
Zirconium (Zr), % 0
0.45 to 0.8
Residuals, % 0
0 to 0.3