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S21800 Stainless Steel vs. ZK61A Magnesium

S21800 stainless steel belongs to the iron alloys classification, while ZK61A magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, 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 ZK61A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 40
5.8 to 7.1
Fatigue Strength, MPa 330
120 to 140
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
18
Shear Strength, MPa 510
170 to 180
Tensile Strength: Ultimate (UTS), MPa 740
290 to 310
Tensile Strength: Yield (Proof), MPa 390
180 to 200

Thermal Properties

Latent Heat of Fusion, J/g 340
330
Maximum Temperature: Mechanical, °C 900
120
Melting Completion (Liquidus), °C 1360
640
Melting Onset (Solidus), °C 1310
530
Specific Heat Capacity, J/kg-K 500
960
Thermal Expansion, µm/m-K 16
27

Otherwise Unclassified Properties

Base Metal Price, % relative 15
13
Density, g/cm3 7.5
1.9
Embodied Carbon, kg CO2/kg material 3.1
23
Embodied Energy, MJ/kg 45
160
Embodied Water, L/kg 150
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
15 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 390
370 to 420
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
62
Strength to Weight: Axial, points 27
42 to 45
Strength to Weight: Bending, points 24
50 to 53
Thermal Shock Resistance, points 17
17 to 18

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
92.1 to 93.9
Manganese (Mn), % 7.0 to 9.0
0
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
Zinc (Zn), % 0
5.5 to 6.5
Zirconium (Zr), % 0
0.6 to 1.0
Residuals, % 0
0 to 0.3