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S21800 Stainless Steel vs. ZE41A Magnesium

S21800 stainless steel belongs to the iron alloys classification, while ZE41A magnesium belongs to the magnesium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (11, 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 ZE41A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
63
Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 40
3.3
Fatigue Strength, MPa 330
98
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
18
Shear Strength, MPa 510
150
Tensile Strength: Ultimate (UTS), MPa 740
210
Tensile Strength: Yield (Proof), MPa 390
140

Thermal Properties

Latent Heat of Fusion, J/g 340
330
Maximum Temperature: Mechanical, °C 900
150
Melting Completion (Liquidus), °C 1360
640
Melting Onset (Solidus), °C 1310
540
Specific Heat Capacity, J/kg-K 500
970
Thermal Expansion, µm/m-K 16
27

Otherwise Unclassified Properties

Base Metal Price, % relative 15
18
Density, g/cm3 7.5
1.9
Embodied Carbon, kg CO2/kg material 3.1
24
Embodied Energy, MJ/kg 45
170
Embodied Water, L/kg 150
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
6.1
Resilience: Unit (Modulus of Resilience), kJ/m3 390
220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
63
Strength to Weight: Axial, points 27
31
Strength to Weight: Bending, points 24
41
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 59.1 to 65.4
0
Magnesium (Mg), % 0
91.7 to 95.4
Manganese (Mn), % 7.0 to 9.0
0 to 0.15
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
Sulfur (S), % 0 to 0.030
0
Unspecified Rare Earths, % 0
0.75 to 1.8
Zinc (Zn), % 0
3.5 to 5.0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3