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AISI 205 Stainless Steel vs. ZK51A Magnesium

AISI 205 stainless steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 205 stainless steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 11 to 51
4.7
Fatigue Strength, MPa 410 to 640
62
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 560 to 850
160
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
240
Tensile Strength: Yield (Proof), MPa 450 to 1100
150

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Mechanical, °C 880
120
Melting Completion (Liquidus), °C 1380
640
Melting Onset (Solidus), °C 1340
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Expansion, µm/m-K 18
26

Otherwise Unclassified Properties

Base Metal Price, % relative 11
13
Density, g/cm3 7.6
1.8
Embodied Carbon, kg CO2/kg material 2.6
24
Embodied Energy, MJ/kg 37
160
Embodied Water, L/kg 150
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 430
10
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 3060
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
64
Strength to Weight: Axial, points 29 to 52
36
Strength to Weight: Bending, points 25 to 37
47
Thermal Shock Resistance, points 16 to 29
15

Alloy Composition

Carbon (C), % 0.12 to 0.25
0
Chromium (Cr), % 16.5 to 18.5
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 62.6 to 68.1
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 14 to 15.5
0
Nickel (Ni), % 1.0 to 1.7
0 to 0.010
Nitrogen (N), % 0.32 to 0.4
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3