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S21800 Stainless Steel vs. ZC63A Magnesium

S21800 stainless steel belongs to the iron alloys classification, while ZC63A magnesium belongs to the magnesium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, 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 S21800 stainless steel and the bottom bar is ZC63A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
60
Elastic (Young's, Tensile) Modulus, GPa 190
48
Elongation at Break, % 40
3.3
Fatigue Strength, MPa 330
94
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
19
Shear Strength, MPa 510
130
Tensile Strength: Ultimate (UTS), MPa 740
220
Tensile Strength: Yield (Proof), MPa 390
130

Thermal Properties

Latent Heat of Fusion, J/g 340
330
Maximum Temperature: Mechanical, °C 900
98
Melting Completion (Liquidus), °C 1360
550
Melting Onset (Solidus), °C 1310
470
Specific Heat Capacity, J/kg-K 500
950
Thermal Expansion, µm/m-K 16
26

Otherwise Unclassified Properties

Base Metal Price, % relative 15
13
Density, g/cm3 7.5
2.1
Embodied Carbon, kg CO2/kg material 3.1
22
Embodied Energy, MJ/kg 45
150
Embodied Water, L/kg 150
920

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
6.3
Resilience: Unit (Modulus of Resilience), kJ/m3 390
190
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
58
Strength to Weight: Axial, points 27
29
Strength to Weight: Bending, points 24
38
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
2.4 to 3.0
Iron (Fe), % 59.1 to 65.4
0
Magnesium (Mg), % 0
89.2 to 91.9
Manganese (Mn), % 7.0 to 9.0
0.25 to 0.75
Nickel (Ni), % 8.0 to 9.0
0 to 0.010
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 3.5 to 4.5
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
5.5 to 6.5
Residuals, % 0
0 to 0.3